ADELPHIA COMMUNICATIONS CORP
424B5, 2001-01-18
CABLE & OTHER PAY TELEVISION SERVICES
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<PAGE>

                                          Filed Pursuant to Rule 424(b)(5)
                                          Registration No. 333-78027

Prospectus Supplement
(To Prospectus Dated May 14, 1999)
                               17,000,000 Shares

                              [LOGO OF ADELPHIA]

                      Adelphia Communications Corporation

                             Class A Common Stock

                               -----------------

   Adelphia Communications Corporation is selling 17,000,000 shares of Class A
common stock that will result in gross proceeds to Adelphia of approximately
$760.8 million.

                               -----------------

   Adelphia's Class A common stock is quoted on the Nasdaq National Market
under the symbol "ADLAC." The last reported sale price of Adelphia's Class A
common stock on the Nasdaq National Market on January 17, 2001, was $45 1/16
per share.

                               -----------------

  Investing in the common stock involves risks. See "Risk Factors" beginning
on page S-6 and page 4.

                               -----------------

<TABLE>
<CAPTION>
                                                         Per Share    Total
                                                         ---------   -------
<S>                                                      <C>       <C>
Offering Price..........................................  $44.75   $760,750,000
Discounts and Commissions to Underwriters ..............  $ 1.79   $ 30,430,000
Offering Proceeds to Adelphia ..........................  $42.96   $730,320,000
</TABLE>

   Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus supplement or the prospectus to which it relates is truthful or
complete. Any representation to the contrary is a criminal offense.

   Adelphia has granted the underwriters the right to purchase up to an
additional 2,550,000 shares of Class A common stock to cover any over-
allotments. The underwriters can exercise this right at any time within thirty
days after the offering. The underwriters expect to deliver the shares of
Class A common stock to investors on or about January 23, 2001.

                               -----------------

                         Joint Book--Running Managers

Banc of America Securities LLC
                                                           Salomon Smith Barney
Credit Suisse First Boston
                             Goldman, Sachs & Co.
                                                     Morgan Stanley Dean Witter

                               -----------------

                               January 17, 2001
<PAGE>

   You should rely only on the information contained in or incorporated by
reference in this prospectus supplement and the accompanying prospectus. We
have not authorized anyone to provide you with different information. We are
not making an offer of these securities in any state where the offer is not
permitted. You should not assume that the information contained in or
incorporated by reference in this prospectus supplement or the accompanying
prospectus is accurate as of any date other than the date on the front of this
prospectus supplement.

                               TABLE OF CONTENTS

                             Prospectus Supplement
<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Prospectus Supplement Summary..............................................  S-2

Risk Factors...............................................................  S-6

Use of Proceeds............................................................ S-17

Capitalization............................................................. S-18

Price Range of Adelphia's Common Equity and Dividend Policy................ S-19

Dilution................................................................... S-20

Description of Capital Stock............................................... S-21

Certain United States Tax Consequences to Non-United States Holders........ S-21

Underwriting............................................................... S-24

Notice to Canadian Residents............................................... S-26

Convertible Subordinated Notes Offering.................................... S-27

Where You Can Find More Information........................................ S-28

Legal Matters.............................................................. S-29

Experts.................................................................... S-29
</TABLE>

                                   Prospectus

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Adelphia...................................................................   2

Risk Factors...............................................................   4

Ratio of Earnings to Fixed Charges and Preferred Stock Dividends...........  16

Dilution...................................................................  17

Use of Proceeds............................................................  17

Description of Debt Securities.............................................  18

Description of Capital Stock...............................................  31

Book Entry Issuance........................................................  36

Plan of Distribution.......................................................  38

Where You Can Find More Information........................................  40

Legal Matters..............................................................  41

Experts....................................................................  42
</TABLE>


                                      S-1
<PAGE>


                         PROSPECTUS SUPPLEMENT SUMMARY

   This summary may not contain all the information that may be important to
you. You should read this entire prospectus supplement and the entire attached
prospectus and those documents incorporated by reference into this document,
including the risk factors, financial data and related notes, before making an
investment decision. When we use the term Adelphia Parent Company in this
prospectus supplement, we are referring only to the parent holding company
entity, Adelphia Communications Corporation, and not to its subsidiaries.

                                    Adelphia

   Adelphia is a leader in the telecommunications industry with cable
television and local telephone operations. We are the sixth largest cable
television operator in the United States. Through our subsidiary Adelphia
Business Solutions, Inc., we own and operate a leading national provider of
facilities-based integrated communications services. John J. Rigas, the
Chairman, President, Chief Executive Officer and founder of Adelphia, has owned
and operated cable television systems since 1952.

   Our operations consist of providing telecommunications services primarily
over our networks, which are commonly referred to as broadband networks because
they can transmit large quantities of video, data and voice by way of digital
or analog signals. We owned cable television systems with broadband networks
that passed in front of approximately 9.0 million homes and served
approximately 5.7 million basic subscribers as of September 30, 2000, after
giving effect to pending cable system acquisitions and swaps. Our core cable
systems are organized into six clusters: Los Angeles, PONY (Western
Pennsylvania, Ohio and Western New York), New England, Florida, Virginia and
Colorado Springs. Approximately 44% of our basic subscribers are located in our
Los Angeles and PONY clusters and approximately 82% of our basic subscribers
are located in our six core clusters.

   Adelphia Business Solutions provides its customers with alternatives to the
incumbent local telephone company for local and long distance voice services,
high-speed data and Internet services. Adelphia Business Solutions' telephone
operations are referred to as being facilities-based, which means it generally
owns the local telecommunications networks and facilities it uses to deliver
these services, rather than leasing or renting the use of another party's
networks to do so. As of September 30, 2000, Adelphia Business Solutions was
serving 79 metropolitan statistical areas and had sold 612,544 access lines of
which 576,857 were installed, approximately 49% of which Adelphia Business
Solutions provisioned on its own switches. Adelphia Business Solutions had 282
central office collocations as of September 30, 2000. Adelphia Business
Solutions' Class A common stock is quoted on the Nasdaq National Market under
the symbol "ABIZ."

Recent Developments

 January 2001 Convertible Subordinated Notes Offering

   Concurrently with this Offering we are offering $750 million aggregate
principal amount of 6% convertible subordinated notes due 2006. For ease of
reference we will refer to that concurrent offering as the Convertible
Subordinated Notes Offering. We expect to receive net proceeds of approximately
$728.9 million from the concurrent Convertible Subordinated Notes Offering. The
Convertible Subordinated Notes Offering and this offering are independent
offerings and are not conditioned on each other. No requirement exists that we
sell these Notes in order to sell Class A common stock in this Offering.


                                      S-2
<PAGE>

 January 2001 Rigas Notes Direct Placement

   On January 17, 2001, we entered into a note purchase agreement with Highland
2000, L.P., an entity controlled by members of the family of John Rigas, under
which Highland agreed to purchase $167.4 million aggregate principal amount of
6% convertible subordinated notes due 2006. In this prospectus supplement, we
will refer to this note purchase as the January 2001 Rigas Notes Direct
Placement. The January 2001 Rigas Notes Direct Placement will be at a per note
price equal to the public offering price less the underwriting discount in the
Convertible Subordinated Notes Offering, plus an interest factor. The terms of
those notes will be substantially identical to the terms of the notes we will
be selling in the Convertible Subordinated Notes Offering, except that those
convertible subordinated notes will be convertible into shares of Class B
common stock. Closing on the January 2001 Rigas Notes Direct Placement will
occur within 270 days of the closing of the Convertible Subordinated Notes
Offering, and is subject to customary closing conditions.

 January 2001 Rigas Common Stock Direct Placement

   On January 17, 2001, we entered into a stock purchase agreement with
Highland 2000, L.P., an entity controlled by members of the family of John
Rigas, under which Highland agreed to purchase 5,819,367 shares of Adelphia
Class B common stock. In this prospectus supplement, we will refer to this
stock purchase as the January 2001 Rigas Common Stock Direct Placement. The
January 2001 Rigas Common Stock Direct Placement will be at a per share price
equal to the public offering price less the underwriting discount in this
Offering, plus an interest factor. Closing on the January 2001 Rigas Common
Stock Direct Placement will occur within 270 days of the closing of this
Offering, and is subject to customary closing conditions.

 January 2001 Credit Facility

   On January 3, 2001, certain subsidiaries of Adelphia closed on a new short
term secured revolving credit facility. The facility is scheduled to expire
November 30, 2001 and provides for initial lending commitments of $1.3 billion,
subject to reductions over time and upon the happening of certain events,
including some debt financings and asset sales. Subject to compliance with the
terms of this new facility for borrowing, proceeds are available for general
corporate purposes. Approximately $360 million of the facility was used to
permanently repay another subsidiary credit facility.

 Cable Systems Swap

   On January 1, 2001, we closed the previously announced cable systems
exchange with Comcast Corporation. As a result of this transaction, Adelphia
added approximately 440,000 basic subscribers in Los Angeles, California and
West Palm/Fort Pierce, Florida. In exchange, Comcast received systems serving
approximately 457,000 basic subscribers in suburban Philadelphia, Pennsylvania,
Ocean County, New Jersey, Ft. Myers, Florida, Michigan, New Mexico and Indiana.
The cable systems exchange will be recorded at fair value and purchase
accounting will be applied as of the date of the transaction.

 Cleveland Acquisition

   On November 1, 2000 we completed the acquisition of cable television systems
owned by Cablevision Systems Corporation for approximately $990 million in cash
and 10.8 million shares of

                                      S-3
<PAGE>

Adelphia Class A common stock. As of September 30, 2000, these cable television
systems served approximately 310,000 basic subscribers in the greater
Cleveland, Ohio metropolitan area.

 Virginia Cluster Acquisitions

   On June 13, 2000, we announced agreements regarding our acquisitions of
cable television systems, including GS Communications, Inc., which are expected
to add approximately 155,000 basic subscribers to our Virginia cluster for an
aggregate cash purchase price of approximately $836 million. With the addition
of these basic subscribers, our Virginia cluster is expected to exceed 700,000
basic subscribers. These transactions are subject to customary closing
conditions, including the receipt of necessary governmental approvals and other
consents, and are expected to close in the first or second quarter of 2001.
                                  ------------

   For other recent developments regarding Adelphia, we refer you to our most
recent and future filings under the Exchange Act.
                                  ------------

   Our executive offices are located at One North Main Street, Coudersport,
Pennsylvania 16915, and our telephone number is (814) 274-9830.

                                      S-4
<PAGE>

                                  The Offering

Class A Common Stock           17,000,000 shares
 Offered....................  -----------
Common Stock to be
 Outstanding:
   Class A Common Stock.....  149,693,656 shares (1)
                              -----------
   Class B Common Stock ....   19,235,998 shares (2)
                              -----------
    Total ..................  168,929,654 shares
                              ===========

Use of Proceeds.............  The net proceeds of this Offering, after
                              deducting offering expenses, are estimated
                              to be approximately $729.8 million, which
                              will be contributed to Adelphia Parent
                              Company's subsidiaries and used to repay
                              borrowings under revolving credit
                              facilities of those subsidiaries, all of
                              which, subject to compliance with the terms
                              of and maturity of the revolving credit
                              facilities, may be reborrowed and used for
                              general corporate purposes such as
                              acquisitions, capital expenditures,
                              investments, including investments in
                              Adelphia Parent Company's subsidiaries, or
                              other corporate purposes.

Rights of Holders of Class
 A Common Stock and Class B
 Common Stock...............  The rights of holders of Class A common
                              stock and Class B common stock differ with
                              respect to certain aspects of dividend,
                              liquidation and voting rights. The Class A
                              common stock has certain preferential
                              rights with respect to cash dividends and
                              distributions upon the liquidation of
                              Adelphia. Holders of Class B common stock
                              are entitled to 10 votes per share while
                              the holders of Class A common stock are
                              entitled to one vote per share on all
                              matters presented to stockholders; however,
                              the holders of Class A common stock, voting
                              as a separate class, are entitled to elect
                              one of Adelphia's directors. See
                              "Description of Capital Stock" in the
                              attached prospectus.

Nasdaq National Market
 symbol for Class A Common
 Stock......................  ADLAC
--------
(1)  Does not include (i) 7,059,546 shares of Class A common stock into which
     our Series D convertible preferred stock can be converted, and (ii)
     13,515,949 shares of Class A common stock into which the 6% convertible
     subordinated notes, which Adelphia is concurrently offering, can be
     converted initially. See "Convertible Subordinated Notes Offering" in this
     prospectus supplement and "Description of Capital Stock--Preferred Stock"
     in the attached prospectus.
(2)  Does not include the approximately (i) 5,819,367 shares of Class B common
     stock to be sold in the January 2001 Rigas Common Stock Direct Placement,
     and (ii) 3,000,000 shares of Class B common stock into which the 6%
     convertible subordinated notes, to be sold in the January 2001 Rigas Notes
     Direct Placement, can be converted initially.

                                      S-5
<PAGE>

                                  RISK FACTORS

   Before you invest in our Class A common stock, you should be aware that
there are various risks associated with investing in Adelphia, including those
described below. You should carefully consider these risk factors together with
all of the other information included or incorporated by reference in this
prospectus supplement before you decide to purchase shares of Adelphia Class A
common stock.

High Level Of Indebtedness

   As of September 30,     Adelphia has a substantial amount of debt. We
2000, we owed              borrowed this money to purchase and to expand our
approximately $11.0        cable systems and other operations and, to a lesser
billion. Our high level    extent, for investments and loans to our
of indebtedness can have   subsidiaries and other affiliates. At September 30,
important adverse          2000, our indebtedness totaled approximately $11.0
consequences to us and     billion. This included approximately:
to you.

                           .  $3.4 billion of Adelphia Parent Company public
                              debt;

                           .  $831.8 million of public debt owed by our
                              subsidiary, Adelphia Business Solutions;

                           .  $1.7 billion of public debt owed by our
                              subsidiary, Arahova Communications, Inc.;

                           .  $516.8 million of public debt owed by our
                              subsidiary, FrontierVision Partners, L.P.;

                           .  $203.1 million of public debt owed by our
                              subsidiary, Olympus Communications, L.P.; and

                           .  $4.3 billion of other debt owed by our
                              subsidiaries to banks, other financial
                              institutions and other persons.

   Debt service consumes   Our high level of indebtedness can have important
a substantial portion of   adverse consequences to us and to you. It requires
the cash we generate.      that we spend a substantial portion of the cash we
This could affect our      get from our business to repay the principal and
ability to invest in our   interest on these debts. Otherwise, we could use
business in the future     these funds for general corporate purposes or for
as well as to react to     capital improvements. Our ability to obtain new
changes in our industry    loans for working capital, capital expenditures,
or economic downturns.     acquisitions or capital improvements may be limited
                           by our current level of debt. In addition, having
                           such a high level of debt could limit our ability
                           to react to changes in our industry and to economic
                           conditions generally. In addition to our debt, at
                           September 30, 2000, the Adelphia Parent Company had
                           approximately $148.5 million and Adelphia Business
                           Solutions had approximately $287.6 million of
                           redeemable exchangeable preferred stock which
                           contain payment obligations that are similar to
                           Adelphia's debt obligations.

   Approximately 34% of    Our debt comes due at various times through the
our debt outstanding at    year 2017, including an aggregate of approximately
September 30, 2000         $3.7 billion as of September 30, 2000, which
matures on or before       matures on or before December 31, 2004.
December 31, 2004
and all of it matures
prior to December 31,
2017.


                                      S-6
<PAGE>

Our Business Requires      Our business requires substantial additional
Substantial Additional     financing on a continuing basis for capital
Financing And If We Do     expenditures and other purposes including:
Not Obtain That
Financing We May Not Be    .  constructing and upgrading our plant and
Able To Upgrade Our           networks--some of these upgrades we must make to
Plant, Offer Services,        comply with the requirements of local cable
Make Payments When Due        franchise authorities;
Or Refinance Existing
Debt                       .  offering new services;

                           .  scheduled principal and interest payments;

                           .  refinancing existing debt; and

                           .  acquisitions and investments.

                           There can be no guarantee that we will be able to
                           issue additional debt or sell stock or other
                           additional equity on satisfactory terms, or at all,
                           to meet our future financing needs.

We Have Had Large Losses   Our Total Convertible Preferred Stock, Common Stock
And We Expect This To      and Other Stockholders' Equity at September 30,
Continue                   2000 was approximately $3.9 billion.

                           Our continuing net losses, which are mainly due to
                           our high levels of depreciation and amortization
                           and interest expense, may create deficiencies in or
                           reduce our Total Convertible Preferred Stock,
                           Common Stock and Other Stockholders' Equity. Our
                           recent net losses applicable to our common
                           stockholders were approximately as follows for the
                           periods specified:

                           .  fiscal year ended March 31, 1998--$192.7
                              million;

                           .  nine months ended December 31, 1998--$114.5
                              million;

                           .  fiscal year ended December 31, 1999--$282.7
                              million; and

                           .  nine months ended September 30, 2000--$346.7
                              million.

                           We expect to continue to incur large net losses for
                           the next several years.

   Our earnings have       Our earnings could not pay for our combined fixed
been insufficient to pay   charges and preferred stock dividends during these
for our fixed charges      periods by the amounts set forth in the table
and preferred stock        below, although combined fixed charges and
dividends.                 preferred stock dividends included substantial non-
                           cash charges for depreciation, amortization and
                           non-cash interest expense on some of our debts and
                           the non-cash expense of Adelphia Business
                           Solutions' preferred stock dividends:
<TABLE>
<CAPTION>
                                                            Earnings  Non-Cash
                                                           Deficiency Charges
                                                           ---------- --------
                                                             (in thousands)
                 <S>                                       <C>        <C>
                 . fiscal year ended March 31, 1998         $113,941  $195,153
                 . nine months ended December 31, 1998      $ 95,595  $186,173
                 . fiscal year ended December 31, 1999      $281,975  $455,266
                 . nine months ended September 30, 2000     $523,470  $753,721
</TABLE>


                                      S-7
<PAGE>

   If we cannot
refinance our debt or      Historically, the cash we generate from our
obtain new loans, we       operating activities and borrowings has been
would likely have to       sufficient to meet our requirements for debt
consider various           service, working capital, capital expenditures and
financing options. We      investments in and advances to our affiliates, and
cannot guarantee that      we have depended on additional borrowings to meet
any options available to   our liquidity requirements. Although in the past we
us would enable us to      have been able both to refinance our debt and to
repay our debt in full.    obtain new debt, there can be no guarantee that we
                           will be able to continue to do so in the future or
                           that the cost to us or the other terms which would
                           affect us would be as favorable to us as current
                           loans and credit agreements. Under these
                           circumstances, we may need to consider various
                           financing options, such as the sale of additional
                           equity or some of our assets to meet the principal
                           and interest payments we owe, negotiate with our
                           lenders to restructure existing loans or explore
                           other options available under applicable laws
                           including those under reorganization or bankruptcy
                           laws. We believe that our business will continue to
                           generate cash and that we will be able to obtain
                           new loans to meet our cash needs. However, the
                           covenants in the indentures and credit agreements
                           for our current debt provide some limitations on
                           our ability to borrow more money.

Competition                The telecommunications services provided by
                           Adelphia are subject to strong competition and
                           potential competition from various sources.

   Our cable television    Our cable television systems compete with other
business is subject to     means of distributing video to home televisions
strong competition from    such as Direct Broadcast Satellite systems,
several sources which      commonly known as DBS systems. Some local telephone
could adversely affect     companies have expressed an interest in entering
revenue or revenue         the video-to-home business.
growth.

                           In addition, because our systems are operated under
                           non-exclusive franchises, other applicants may
                           obtain franchises in our franchise areas and
                           overbuild our systems. For example, some regional
                           Bell telephone operating companies and local
                           telephone companies have facilities which are
                           capable of delivering cable television service and
                           could seek competitive franchises. We cannot
                           predict either the extent to which competition will
                           continue to materialize or, if such competition
                           materializes, the extent of its effect on our cable
                           television business.

                           Our cable television systems also face competition
                           from other communications and entertainment media,
                           including conventional off-air television
                           broadcasting services, newspapers, movie theaters,
                           live sporting events and home video products. We
                           cannot predict the extent to which competition may
                           affect us.

                           Our cable modem and dial up Internet access
                           business is currently subject to strong competition
                           and there exists the potential for

                                      S-8
<PAGE>

                           future competition from a number of sources. With
                           respect to high-speed cable modem service,
                           telephone companies are beginning to implement
                           various digital subscriber line services, xDSL,
                           that allow high-speed internet access services to
                           be offered over telephone lines. DBS companies
                           offer high-speed Internet access over their
                           satellite facilities and other terrestrial based
                           wireless operators, or MultiChannel Multipoint
                           Distribution Systems, commonly known as MMDS, are
                           beginning to introduce high-speed access as well.
                           In addition, there are now a number of legislative,
                           judicial and regulatory efforts seeking to mandate
                           cable television operators to provide open access
                           to their facilities to competitors that want to
                           offer Internet access over cable services. With
                           respect to dial up Internet access services, there
                           are numerous competitive Internet Service Providers
                           commonly known as ISPs, in virtually every
                           franchise area. The local telephone exchange
                           company typically offers ISP services, as do a
                           number of other nationally marketed ISPs such as
                           America Online, Compuserve and AT&T Worldnet.
                           Adelphia cannot predict the extent to which
                           competition will continue to materialize or, if
                           such competition materializes, the extent of its
                           effect on our Internet access business.

   We depend on third-     We depend on vendors to supply the set-top
party equipment and        converter boxes for analog and digital cable
software suppliers. If     services. This equipment is available from a
we are unable to procure   limited number of suppliers. We typically purchase
the necessary equipment,   set-top converter boxes under purchase orders
our ability to offer our   placed from time to time and do not carry
services could be          significant inventories of set-top converter boxes.
impaired. This could       If demand for set-top converter boxes exceeds our
adversely affect our       inventories and we are unable to obtain required
growth, financial          set-top converter boxes on a timely basis and at an
condition and results of   acceptable cost, our ability to recognize
operations.                additional revenue from these services could be
                           delayed or impaired. In addition, if there are no
                           suppliers who are able to provide converter devices
                           that comply with evolving Internet
                           and telecommunications standards or that are
                           compatible with other products or components we
                           use, our business may be materially impaired.

   Adelphia Business       In each of the markets served by Adelphia Business
Solutions' operations      Solutions' networks, the competitive local exchange
are also subject to risk   carrier services offered by Adelphia Business
because Adelphia           Solutions compete principally with the services
Business Solutions         offered by the incumbent local telephone exchange
competes principally       carrier company serving that area. Local telephone
with established local     companies have long-standing relationships with
telephone carriers that    their customers, have the potential to subsidize
have long-standing         competitive services from monopoly service
utility relationships      revenues, and benefit from favorable state and
with their customers and   federal regulations. The mergers of Bell Atlantic
pricing flexibility for    and NYNEX, SBC and Ameritech, and Bell Atlantic and
local telephone            GTE, which created Verizon Communications, created
services.                  very large companies whose combined territories
                           cover a substantial portion of Adelphia Business
                           Solutions' markets. Other

                                      S-9
<PAGE>

                           combinations are occurring in the industry, such as
                           the merger between Qwest and US West, which may
                           have a material adverse effect on Adelphia Business
                           Solutions' ability to compete and terminate and
                           originate calls over Adelphia Business Solutions'
                           networks.

                           We believe that local telephone companies will gain
                           increased pricing flexibility from regulators as
                           competition increases. Adelphia Business Solutions'
                           operating results and cash flow could be materially
                           and adversely affected by actions by regulators,
                           including permitting the incumbent local telephone
                           companies in Adelphia Business Solutions' markets
                           to do the following:

                           .  lower their rates substantially;

                           .  engage in aggressive volume and term discount
                              pricing practices for their customers; or

                           .  charge excessive fees or otherwise impose on
                              Adelphia Business Solutions excessive obstacles
                              for interconnection to the incumbent local
                              telephone company's networks.

   If the regional Bell    The regional Bell telephone operating companies can
telephone operating        now obtain regulatory approval to offer long
companies could get        distance services if they comply with the local
regulatory approval to     market opening requirements of the federal
offer long distance        Telecommunications Act of 1996. To date, the FCC
service in competition     has denied the requests for approval filed by
with Adelphia Business     regional Bell operating companies in Adelphia
Solutions' significant     Business Solutions' operating areas, other than in
customers, some of these   New York and Texas, where Verizon's and SBC's
major customers could      petitions to provide long distance services have
lose market share.         been approved. Approvals of such requests could
                           result in decreased market share for the major long
                           distance carriers which are among Adelphia Business
                           Solutions' significant customers. This could have a
                           material adverse effect on Adelphia Business
                           Solutions.

                           In addition, once they obtain long distance
                           authority, the regional Bell telephone operating
                           companies could be less cooperative in providing
                           access to their networks. This lack of cooperation,
                           or labor strikes or work stoppages similar to the
                           August 2000 Verizon strike, could impair or delay
                           the ability of Adelphia Business Solutions to
                           connect its networks with those of the incumbent
                           local exchange carriers.

   The regional Bell       Some of the regional Bell operating companies have
telephone companies        also filed petitions with the FCC requesting
continue to seek other     waivers of other obligations under the federal
regulatory approvals       Telecommunications Act of 1996. These involve
that could significantly   services Adelphia Business Solutions also provides
enhance their              such as high speed data, long distance, and
competitive position       services to ISPs. If the FCC grants the regional
against Adelphia           Bell operating companies' petitions, this could
Business Solutions.        have a material adverse effect on Adelphia Business
                           Solutions.


                                      S-10
<PAGE>

   Potential competitors
to Adelphia Business       Potential competitors for Adelphia Business
Solutions'                 Solutions include other competitive local exchange
telecommunications         carriers, incumbent local telephone companies which
services include the       are not subject to regional Bell operating
regional Bell telephone    companies' restrictions on offering long distance
companies, AT&T,           service, AT&T, MCI/WorldCom, Sprint, Global
MCI/WorldCom and Sprint,   Crossing and other long distance carriers, cable
electric utilities and     television companies, electric utilities, microwave
other companies that       carriers, wireless telecommunications providers,
have advantages over       and private networks built by large end users. Both
Adelphia Business          AT&T and MCI/WorldCom offer local telephone
Solutions.                 services in some areas of the country and are
                           expanding their networks. AT&T also merged with
                           both Tele-Communications, Inc. and MediaOne Group,
                           Inc., thereby becoming the largest operator of
                           cable television systems in the country. Although
                           we have good relationships with the long distance
                           carriers, they could build their own facilities,
                           purchase other carriers or their facilities, or
                           resell the services of other carriers rather than
                           use Adelphia Business Solutions' services when
                           entering the market for local exchange services.

                           Many of Adelphia Business Solutions' current and
                           potential competitors, particularly incumbent local
                           telephone companies, have financial, personnel and
                           other resources substantially greater than those of
                           Adelphia Business Solutions, as well as other
                           competitive advantages over Adelphia Business
                           Solutions.

We Are Subject To          The cable television industry and the provision of
Extensive Regulation       local telephone exchange services are subject to
                           extensive regulation at the federal, state and
   Our cable television    local levels, and many aspects of such regulation
and telecommunications     are currently the subject of judicial proceedings
businesses are heavily     and administrative or legislative proposals. In
regulated as to rates we   particular, FCC regulations limit our ability to
can charge and other       set and increase rates for our basic service
matters. This regulation   package and for the provision of cable television-
could limit our ability    related equipment. The law permits certified local
to increase rates, cause   franchising authorities to order refunds of rates
us to decrease then        paid in the previous 12-month period determined to
current rates or require   be in excess of the permitted reasonable rates. It
us to refund previously    is possible that rate reductions or refunds of
collected fees.            previously collected fees may be required in the
                           future. In addition, the FCC has commenced a
                           proceeding to determine whether cable operators
                           will be required to carry the digital signals of
                           broadcast television stations. Such a requirement
                           could require the removal of popular programming
                           services with materially adverse results for cable
                           operators.

                           We must comply with rules of the local franchising
                           authorities to retain and renew our cable
                           franchises, among other matters. There can be no
                           assurances that the franchising authorities will
                           not impose new and more restrictive requirements as
                           a condition to franchise renewal.


                                      S-11
<PAGE>

                           Similarly, Adelphia Business Solutions is subject
                           to state and local regulations and in some cases
                           must obtain appropriate state certifications and/or
                           local franchises to construct facilities and offer
                           services. There can be no assurance that Adelphia
                           Business Solutions' state and local regulators will
                           not impose new and more restrictive requirements as
                           a condition to renew any required certifications
                           and franchises.

                           On February 26, 1999, the FCC released a
                           Declaratory Ruling and Notice of Proposed
                           Rulemaking which held that calls to ISPs within a
                           local calling area are "non-local" because such
                           calls tend to continue beyond state borders,
                           meaning that the reciprocal compensation provisions
                           of the federal Telecommunications Act of 1996 did
                           not apply to calls to ISPs. However, the FCC left
                           open the possibility that state commissions could
                           impose reciprocal compensation obligations on local
                           exchange carriers that send calls to ISPs.
                           Imposition of reciprocal compensation obligations
                           would benefit the local exchange carriers that
                           terminate the calls with the ISP, such as
                           competitive local exchange carriers that provide
                           local exchange services to their own ISPs. As ISPs
                           do not make outgoing calls, the compensation for
                           terminating traffic would always flow from the LECs
                           that originate the calls to the LECs that terminate
                           the calls. The United States Court of Appeals for
                           the District of Columbia Circuit vacated this FCC
                           ruling on March 24, 2000, and remanded the matter
                           to the FCC, where this reciprocal compensation
                           matter remains pending.

                           Proposals are continuing to be made before Congress
                           and the FCC to mandate cable operators to provide
                           "open access" over their cable systems to other
                           ISPs. To date, the FCC has declined to impose such
                           requirements. This same open access issue is being
                           considered by some local franchising authorities as
                           well. Several local franchising authorities have
                           mandated open access. This issue is being actively
                           litigated. A federal district court in Portland,
                           Oregon, upheld the authority of the local
                           franchising authority to impose an open access
                           requirement in connection with a cable television
                           franchise transfer. On appeal, the U.S. Court of
                           Appeals for the Ninth Circuit reversed the district
                           court and ruled that a local franchising authority
                           has no authority to impose an open access
                           requirement on cable television operators.
                           Additionally, federal district courts in Richmond,
                           Virginia and Miami, Florida have held that a local
                           franchising authority cannot impose an open access
                           requirement. The Virginia case has been appealed to
                           the U.S. Court of Appeals for the Fourth Circuit.
                           If the FCC or other authorities mandate additional
                           access to Adelphia's cable systems, we cannot
                           predict the effect that this would have on our
                           Internet access over cable business.

                                      S-12
<PAGE>

   The federal
Telecommunications Act     The federal Telecommunications Act of 1996
of 1996 may have a         substantially changed federal, state and local laws
significant impact on      and regulations governing our cable television and
our cable television and   telecommunications businesses. This law could
telephone businesses.      materially affect the growth and operation of the
                           cable television industry and the cable services we
                           provide. Although this legislation may lessen
                           regulatory burdens, the cable television industry
                           may be subject to new competition as a result.
                           There are numerous rulemakings that have been and
                           continue to be undertaken by the FCC which will
                           interpret and implement the provisions of this law.
                           Furthermore, portions of this law have been, and
                           likely other portions will be, challenged in the
                           courts. We cannot predict the outcome of such
                           rulemakings or lawsuits or the short- and long-term
                           effect, financial or otherwise, of this law and FCC
                           rulemakings on us.

                           Similarly, the federal Telecommunications Act of
                           1996 removes entry barriers for all companies and
                           could increase substantially the number of
                           competitors offering comparable services in
                           Adelphia Business Solutions' markets or potential
                           markets. Furthermore, we cannot guarantee that
                           rules adopted by the FCC or state regulators or
                           other legislative or judicial initiatives relating
                           to the telecommunications industry will not have a
                           material adverse effect on Adelphia Business
                           Solutions.

Unequal Voting Rights      Adelphia has two classes of common stock--Class A
Of Stockholders            which carries one vote per share and Class B which
                           carries 10 votes per share. Under Adelphia's
                           Certificate of Incorporation, the Class A shares
                           elect only one of our nine directors.

Control Of Voting Power    While the public owns a majority of the outstanding
By The Rigas Family        shares of Adelphia's Class A common stock, the
                           Rigas family owns about 19% of those shares as of
   The Rigas family can    January 17, 2001, as well as all of the outstanding
control stockholder        shares of Class B common stock. As of such date,
decisions on very          the Rigas family beneficially owns shares
important matters.         representing approximately 30% of the total number
                           of outstanding shares of both classes of Adelphia's
                           common stock and approximately 67% of the total
                           voting power of Adelphia's shares. As a result of
                           the Rigas family's stock ownership and an agreement
                           among the Class B stockholders, members of the
                           Rigas family have the power to elect eight of nine
                           Adelphia directors. In addition, the Rigas family
                           could control stockholder decisions on other
                           matters such as amendments to Adelphia's
                           Certificate of Incorporation and Bylaws, and
                           mergers or other fundamental corporate
                           transactions. Sales of Class B common stock to the
                           Rigas family under the January 2001 Rigas Common
                           Stock Direct Placement, and the Class B common
                           stock which will be issuable upon the conversion of
                           the convertible subordinated notes sold to the
                           Rigas family under the January 2001 Rigas Notes
                           Direct Placement, will increase the voting power of
                           the Rigas family.

                                      S-13
<PAGE>

There Are Potential
Conflicts Of Interest      John J. Rigas and the other executive officers of
Between Adelphia And The   Adelphia, including other members of the Rigas
Rigas Family               family, own other corporations and partnerships,
                           which are managed by us for a fee. Subject to the
                           restrictions contained in a business opportunity
                           agreement regarding future acquisitions, Rigas
                           family members and the executive officers are free
                           to continue to own these interests and acquire
                           additional interests in cable television systems.
                           These activities could present a conflict of
                           interest with Adelphia, such as how much time our
                           executive officers devote to our business. In
                           addition, there have been and will continue to be
                           transactions between us and the executive officers
                           or the other entities they own or with which they
                           have affiliations.

Holding Company            The Adelphia Parent Company directly owns no
Structure And Potential    significant assets other than stock, partnership
Impact Of Restrictive      interests and equity and other interests in our
Covenants In Subsidiary    subsidiaries and in other companies. This creates
Debt Agreements            risks regarding our ability to provide cash to the
                           Adelphia Parent Company to repay the interest and
                           principal which it owes, our ability to pay cash
                           dividends to our common stockholders in the future,
                           and the ability of our subsidiaries and other
                           companies to respond to changing business and
                           economic conditions and to get new loans.

   The Adelphia Parent     The public indentures and the credit agreements for
Company depends on its     bank and other financial institution loans of our
subsidiaries and other     subsidiaries and other companies in which we have
companies in which it      invested, restrict their ability and the ability of
has investments to fund    the companies they own to make payments to the
its cash needs.            Adelphia Parent Company. These agreements also
                           place other restrictions on the borrower's ability
                           to borrow new funds. The ability of a subsidiary or
                           a company in which we have invested to comply with
                           debt restrictions may be affected by events that
                           are beyond our control. The breach of any of these
                           covenants could result in a default which could
                           result in all loans and other amounts owed to its
                           lenders becoming due and payable. Our subsidiaries
                           and companies in which we have invested might not
                           be able to repay in full the accelerated loans.

It Is Unlikely You Will    Adelphia has never declared or paid cash dividends
Receive A Return On Your   on any of its common stock and has no intention of
Shares Through The         doing so in the foreseeable future. As a result, it
Payment Of Cash            is unlikely that you will receive a return on your
Dividends                  shares through the payment of cash dividends.

Future Sales Of Adelphia   Sales of a substantial number of shares of Class A
Common Stock Could         common stock or Class B common stock, including
Adversely Affect Its       sales by any pledgees of such shares, could
Market Price               adversely affect the market price of Class A common
                           stock and could impair our ability in the future to
                           raise capital through stock offerings. Under
                           various registration rights agreements or
                           arrangements, as of January 5, 2001, the Rigas
                           family has the right, subject to some limitations,
                           to require

                                      S-14
<PAGE>

                           Adelphia to register substantially all of the
                           shares which it owns of Class A common stock,
                           consisting of approximately 25,600,000 shares,
                           Class B common stock, consisting of 19,235,998
                           shares and the equivalent number of shares of Class
                           A common stock into which they may be converted.
                           Among others, Adelphia has registered or agreed to
                           register for public sale the following shares:

                           .  for Citizens Cable Company--1,852,302 shares of
                              Class A common stock owned as of October 1,
                              1999;

                           .  for the selling stockholders receiving shares in
                              the Verto Communications, Inc. acquisition--
                              2,574,379 shares of Class A common stock;

                           .  for an entity controlled by members of the
                              family of John Rigas--5,819,367 shares of Class
                              B (and the underlying Class A) common stock to
                              be purchased by that entity within 270 days
                              following the closing of this Offering;

                           .  for an entity controlled by members of the
                              family of John Rigas--approximately 3,000,000
                              shares of Class B (and the underlying Class A)
                              common stock, upon conversion of the convertible
                              subordinated notes to be purchased by that
                              entity within 270 days following the closing of
                              the Convertible Subordinated Notes Offering;

                           .  for the owners of FrontierVision--7,000,000
                              shares of Class A common stock in connection
                              with the FrontierVision acquisition;

                           .  in connection with the Century Communications
                              Corp. acquisition approximately 48,700,000
                              shares of Class A common stock; and

                           .  in connection with the acquisition of the
                              greater Cleveland systems from Cablevision
                              Systems Corporation, 10,800,000 shares of Class
                              A common stock.

                           Up to approximately 25,600,000 shares of Class A
                           common stock have been or may be pledged by members
                           of the Rigas family in connection with margin loans
                           made to members of the Rigas family. These pledgees
                           could freely sell any shares acquired upon a
                           foreclosure.

Our Acquisitions And       Because we are experiencing a period of rapid
Expansion Could Involve    expansion through acquisition, the operating
Operational And Other      complexity of Adelphia, as well as the
Risks                      responsibilities of management personnel, have
                           increased. Our ability to manage such expansion
                           effectively will require us to continue to expand
                           and improve our operational and financial systems
                           and to expand, train and manage our employee base.


                                      S-15
<PAGE>

                           Our recent and pending acquisitions involve, and
                           our future acquisitions will involve, the
                           acquisition of companies that have previously
                           operated independently. There is no guarantee that
                           we will be able to realize the benefits expected
                           from the integration of operations from these
                           transactions.

Purchasers Of Our Common   Persons purchasing Class A common stock will incur
Stock Will Incur           immediate and substantial net tangible book value
Immediate Dilution         dilution.


Forward-Looking            The statements contained or incorporated by
Statements In This         reference in this prospectus supplement that are
Prospectus Supplement      not historical facts are "forward-looking
Are Subject To Risks And   statements" and can be identified by the use of
Uncertainties              forward-looking terminology such as "believes,"
                           "expects," "may," "will," "should," "intends" or
                           "anticipates" or the negative thereof or other
                           variations thereon or comparable terminology, or by
                           discussions of strategy that involve risks and
                           uncertainties.

                           Certain information set forth or incorporated by
                           reference in this prospectus supplement, including
                           "Management's Discussion and Analysis of Financial
                           Condition and Results of Operations" in Adelphia's
                           Annual Report on Form 10-K, as amended by Form 10-
                           K/A-2, and in Adelphia's Quarterly Reports on Form
                           10-Q, as amended, is forward-looking. Such forward-
                           looking information involves important risks and
                           uncertainties that could significantly affect
                           expected results in the future from those expressed
                           in any forward-looking statements made by, or on
                           behalf of, us. These risks and uncertainties
                           include, but are not limited to, uncertainties
                           relating to economic conditions, the availability
                           and cost of capital, acquisitions and divestitures,
                           government and regulatory policies, the pricing and
                           availability of equipment, materials, inventories
                           and programming, dependence on customers and their
                           spending patterns, reliance on vendors, product
                           acceptance, our ability to construct, expand and
                           upgrade our cable systems, fiber optic networks and
                           related facilities, technological developments and
                           changes in the competitive environment in which we
                           operate. Persons reading this prospectus supplement
                           are cautioned that such statements are only
                           predictions and that actual events or results may
                           differ materially. In evaluating such statements,
                           readers should specifically consider the various
                           factors which could cause actual events or results
                           to differ materially from those indicated by such
                           forward-looking statements.


                                      S-16
<PAGE>

                                USE OF PROCEEDS

   The net proceeds to Adelphia from this Offering described on the cover page
of this prospectus supplement are estimated to be approximately $729.8 million,
after deducting estimated underwriting discount and commissions and offering
expenses. The net proceeds to Adelphia from the concurrent Convertible
Subordinated Notes Offering are estimated to be approximately $728.9 million,
after deducting estimated underwriting discount and commissions and offering
expenses. No requirement exists that we sell these convertible subordinated
notes in order to sell Class A common stock in this Offering. The net proceeds
from this Offering and the Convertible Subordinated Notes Offering, if
completed, initially will be invested in cash equivalents or advanced or
contributed to Adelphia's subsidiaries which will apply such funds to repay
revolving credit facilities of such subsidiaries. As of September 30, 2000, the
average effective interest rate on such credit facilities was approximately
8.44%. Subject to compliance with the terms of and to the maturity of the
revolving credit facilities, Adelphia expects that these subsidiaries will
reborrow these amounts and distribute them to Adelphia which, together with any
cash equivalents into which the net proceeds were invested, Adelphia intends to
use for general corporate purposes including, in connection with its pending
Virginia cluster acquisitions described in "Prospectus Supplement Summary--
Recent Developments," for working capital and for other corporate purposes.

   On January 17, 2001, Highland 2000, L.P., an entity controlled by members of
the family of John Rigas, agreed to purchase 5,819,367 shares of Adelphia's
Class B common stock at a per share price equal to the public offering price
set forth on the cover page of this prospectus supplement less the underwriting
discount, plus an interest factor. The net proceeds from the January 2001 Rigas
Common Stock Direct Placement are expected to be similarly advanced to
Adelphia's subsidiaries to repay revolving credit facilities, temporarily
invested in short term investments or used for general corporate purposes.

   On January 17, 2001, Highland 2000, L.P., an entity controlled by members of
the family of John Rigas, agreed to purchase $167.4 million of 6% convertible
subordinated notes due 2006 at a per note price equal to the public offering
price set forth on the cover page of a separate prospectus supplement less the
underwriting discount, plus an interest factor. The convertible subordinated
notes to be purchased in the January 2001 Rigas Notes Direct Placement are
convertible into shares of Adelphia's Class B common stock. The net proceeds
from the January 2001 Rigas Notes Direct Placement are expected to be similarly
advanced to Adelphia's subsidiaries to repay revolving credit facilities,
temporarily invested in short term investments or used for general corporate
purposes.

                                      S-17
<PAGE>

                                 CAPITALIZATION
                  (Dollars in thousands except share amounts)

   The following table sets forth the cash and cash equivalents and
capitalization of Adelphia as of September 30, 2000, (1) on an actual basis,
(2) on an as adjusted basis to reflect this Offering, the January 2001 Rigas
Common Stock Direct Placement and the estimated impact of the pending Virginia
cluster acquisitions and the completed transactions described in "Prospectus
Supplement Summary--Recent Developments," exclusive of the Cable Systems Swap
and (3) on an as further adjusted basis to reflect the Convertible Subordinated
Notes Offering, the January 2001 Rigas Notes Direct Placement and the items
described in (2) above. This table should be read in conjunction with
Adelphia's consolidated financial statements and related notes thereto and
other financial data contained elsewhere or incorporated by reference in this
prospectus supplement.
<TABLE>
<CAPTION>
                                                 September 30, 2000
                                      -----------------------------------------
                                                                    As Further
                                        Actual     As Adjusted (b) Adjusted (c)
                                      -----------  --------------- ------------
<S>                                   <C>          <C>             <C>
Cash and cash equivalents...........  $   146,286    $   146,286   $   146,286
Restricted cash.....................       66,652         66,652        66,652
                                      -----------    -----------   -----------
  Total cash, cash equivalents, and
   restricted cash..................  $   212,938    $   212,938   $   212,938
                                      ===========    ===========   ===========
Long-term debt including current
 maturities (a):
  Subsidiary debt...................  $ 7,582,178    $ 8,443,529   $ 7,547,278
  Parent debt.......................    3,423,233      3,423,233     4,340,609
                                      -----------    -----------   -----------
   Total long-term debt including
    current maturities..............   11,005,411     11,866,762    11,887,887
                                      -----------    -----------   -----------
Adelphia Business Solutions
 redeemable exchangeable preferred
 stock..............................      287,584        287,584       287,584
                                      -----------    -----------   -----------
Redeemable exchangeable preferred
 stock..............................      148,492        148,492       148,492
                                      -----------    -----------   -----------
Convertible preferred stock, common
 stock and other stockholders'
 equity:
  5 1/2% Series D convertible
   preferred stock ($575,000
   liquidation preference)..........           29             29            29
  Class A common stock, $.01 par
   value, 1,200,000,000 shares
   authorized; 122,875,159 shares
   issued on an Actual basis and
   150,675,159 shares issued on an
   As Adjusted and As
   Further Adjusted basis ..........        1,228          1,507         1,507
  Class B common stock, $.01 par
   value, 300,000,000 shares
   authorized; 19,235,998 shares
   issued and outstanding on an
   Actual basis and 25,055,365
   shares issued and outstanding on
   an As Adjusted basis and As
   Further Adjusted basis...........          192            251           251
Additional paid-in capital..........    6,343,607      7,863,089     7,863,089
Accumulated deficit.................   (2,279,624)    (2,279,624)   (2,279,624)
Accumulated other comprehensive
 loss...............................      (43,943)       (43,943)      (43,943)
Treasury stock, at cost, 1,091,524
 shares of Class A common stock and
 20,000 shares of 8 1/8% Series C
 cumulative convertible preferred
 stock..............................     (149,401)      (149,401)     (149,401)
                                      -----------    -----------   -----------
   Total convertible preferred
    stock, common stock and other
    stockholders' equity ...........    3,872,088      5,391,908     5,391,908
                                      -----------    -----------   -----------
     Total capitalization...........  $15,313,575    $17,694,746   $17,715,871
                                      ===========    ===========   ===========
</TABLE>
--------
(a)  See Note 3 to Adelphia's consolidated financial statements in the Form 10-
     K/A-2 for a description of long-term debt of Adelphia and its
     subsidiaries. See "Management's Discussion and Analysis of Financial
     Condition and Results of Operations--Liquidity and Capital Resources" in
     the Form 10-K/A-2 and the Form 10-Q/As.
(b) Gives effect to (i) the application of the estimated net proceeds of
    approximately $729.8 million from this Offering, approximately $250.0
    million from the January 2001 Rigas Common Stock Direct Placement as
    described in "Use of Proceeds," and (ii) the estimated impact of the
    pending Virginia cluster acquisitions and the completed transactions
    described in "Prospectus Supplement Summary--Recent Developments" exclusive
    of the Cable Systems Swap.
(c) Gives effect to (i) the application of the estimated net proceeds of
    approximately $729.8 million from this Offering, approximately $250.0
    million from the January 2001 Rigas Common Stock Direct Placement and
    approximately $167.4 million from the January 2001 Rigas Notes Direct
    Placement, approximately $728.9 million from the Convertible Subordinated
    Notes Offering as described in "Use of Proceeds," and (ii) the estimated
    impact of the pending Virginia cluster acquisitions and the completed
    transactions described in "Prospectus Supplement Summary--Recent
    Developments" exclusive of the Cable Systems Swap.

                                      S-18
<PAGE>

          PRICE RANGE OF ADELPHIA'S COMMON EQUITY AND DIVIDEND POLICY

   Our Class A common stock is quoted on the Nasdaq National Market under the
symbol "ADLAC."

   The following table sets forth the range of high and low closing sale
prices of the Class A common stock for the fiscal periods indicated, as
reported by the Nasdaq National Market.

                             Class A common stock

<TABLE>
<CAPTION>
                                                               High       Low
                                                             --------- ---------
      1998
      <S>                                                    <C>       <C>
        First Quarter Ended 3/31/98......................... $29 5/8   $16 1/2
        Second Quarter Ended 6/30/98........................ $37 1/8   $22 1/8
        Third Quarter Ended 9/30/98......................... $43 5/16  $31 11/16
        Fourth Quarter Ended 12/31/98....................... $47 1/2   $32 5/8
<CAPTION>
      1999
      <S>                                                    <C>       <C>
        First Quarter Ended 3/31/99......................... $63       $45 5/8
        Second Quarter Ended 6/30/99 ....................... $86 9/16  $56
        Third Quarter Ended 9/30/99......................... $68 3/8   $55 1/2
        Fourth Quarter Ended 12/31/99....................... $66       $48 1/2
<CAPTION>
      2000
      <S>                                                    <C>       <C>
        First Quarter Ended 3/31/00......................... $74 7/16  $45
        Second Quarter Ended 6/30/00........................ $49 13/16 $39
        Third Quarter Ended 9/30/00......................... $47 7/8   $24 1/8
        Fourth Quarter Ended 12/31/00....................... $51 5/8   $25 1/4
<CAPTION>
      2001
      <S>                                                    <C>       <C>
        First Quarter (through 1/17/01)..................... $50 5/16  $43 11/16
</TABLE>

   As of January 5, 2001, approximately 687 holders of record held our Class A
common stock.

   No established public trading market exists for our Class B common stock.
As of the date hereof, the Class B common stock was held of record by six
persons, all members of the Rigas family, including a Pennsylvania general
partnership all of whose partners are members of the Rigas family. The
Class B common stock is convertible into shares of Class A common stock on a
one-to-one basis. As of the date of this prospectus supplement, the Rigas
family owned 100% of the outstanding Class B common stock.

Dividend Policy

   We have never paid a cash dividend on our common stock and anticipate that
for the foreseeable future any earnings will be retained for use in our
business. Our ability to pay cash dividends on our common stock is limited by
the provisions of our indentures.

                                     S-19
<PAGE>

                                    DILUTION

   The net tangible book value of Adelphia's common stock as of September 30,
2000 was a deficit of approximately $8,707,969,000 or a negative $61.75 a
share. Net tangible book value per share represents the amount of Adelphia's
convertible preferred stock, common stock and other stockholders' equity, less
intangible assets, divided by the number of shares of Adelphia's common stock
outstanding. Purchasers of Class A common stock will have an immediate dilution
of net tangible book value which, due to our having a net tangible book value
deficit, will exceed the purchase price per share.

   Net tangible book value dilution per share represents the difference between
the amount per share paid by purchasers of shares of Class A common stock in
this Offering and the pro forma net tangible book value per share of the common
stock immediately after completion of this Offering excluding the January 2001
Rigas Common Stock Direct Placement, the Convertible Subordinated Notes
Offering, the January 2001 Rigas Notes Direct Placement and the pending
Virginia cluster acquisitions and the completed transactions described in
"Prospectus Supplement Summary--Recent Developments." After giving effect to
the sale by Adelphia of 17,000,000 shares of Class A common stock in this
Offering at a public offering price of $44.75 per share, and after deducting
the underwriting discount and commissions and estimated offering expenses, the
pro forma net tangible book value of Adelphia as of September 30, 2000 was a
deficit of approximately $7,978,149,000, or negative $50.49 per share of common
stock. This represents an immediate increase in net tangible book value of
$11.26 per share to existing stockholders and an immediate dilution of net
tangible book value of $95.24 per share to purchasers of Class A common stock
in this Offering, as illustrated in the following table:

<TABLE>
<S>                                                            <C>      <C>
Public offering price per share of Class A common stock.......          $ 44.75
  Net tangible book value per share of common stock before
   this Offering.............................................. $(61.75)
  Increase per share of common stock attributable to this
   Offering...................................................   11.26
                                                               -------
Pro forma net tangible book value per share of common stock
 after this Offering..........................................           (50.49)
                                                                        -------
Net tangible book value dilution per share....................          $(95.24)
                                                                        =======
</TABLE>


                                      S-20
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

   Adelphia's authorized capital stock consists of 1,200,000,000 shares of
Class A common stock, 300,000,000 shares of Class B common stock, and
50,000,000 shares of preferred stock. For a further description of the terms
and conditions of our capital stock, see "Description of Capital Stock" in the
attached prospectus.

                     CERTAIN UNITED STATES TAX CONSEQUENCES
                          TO NON-UNITED STATES HOLDERS

   The following is a general discussion of certain United States federal
income and estate tax consequences of the ownership and disposition of Class A
common stock applicable to "Non-United States Holders." A "Non-United States
Holder" is any beneficial owner of Class A common stock that, for United States
federal income tax purposes, is a non-resident alien individual, a foreign
corporation, a foreign partnership or a non-resident fiduciary of a foreign
estate or trust as such terms are defined in the Code. This discussion is based
on the Code and administrative and judicial interpretations as of the date
hereof, all of which are subject to change either retroactively or
prospectively. This discussion does not address all aspects of United States
federal income and estate taxation that may be relevant to Non-United States
Holders in light of their particular circumstances (for example, insurance
companies, tax exempt organizations, financial institutions, broker-dealers or
certain U.S. expatriates) and does not address any tax consequences arising
under the laws of any state, local or foreign taxing jurisdiction. Prospective
investors are urged to consult with their tax advisors regarding the United
States federal, state and local income and other tax consequences, and the non-
United States tax consequences, of owning and disposing of Class A common
stock.

Dividends

   Subject to the discussion below, any dividend paid to a Non-United States
Holder generally will be subject to United States withholding tax either at a
rate of 30% of the gross amount of the dividend or such lower rate as may be
specified by an applicable income tax treaty. In order to claim a reduced
withholding rate under an applicable income tax treaty, a Non-United States
Holder would be required to file Form W-8BEN or other forms specified by the
Treasury regulations and may be required to provide a United States taxpayer
identification number.

   Dividends received by a Non-United States Holder that are effectively
connected with a United States trade or business conducted by such Non-United
States Holder are exempt from withholding tax. However, such effectively
connected dividends are subject to regular United States income tax in the same
manner as if the Non-United States Holder were a United States resident. A Non-
United States Holder may claim exemption from withholding under the effectively
connected income exception by filing Form W-8ECI and may be required to provide
a United States taxpayer identification number with Adelphia or its paying
agent prior to the payment of the dividends. Effectively connected dividends
received by a corporate Non-United States Holder may be subject to an
additional "branch profits tax" at a rate of 30% (or such lower rate as may be
specified by an applicable tax treaty) of such corporate Non-United States
Holder's effectively connected earnings and profits, subject to certain
adjustments.


                                      S-21
<PAGE>

   To the extent a distribution exceeds current or accumulated earnings or
profits, it will be treated first as a return of the holder's basis to the
extent thereof, and then as a gain from the sale of a capital asset. Any
withholding tax on distributions in excess of Adelphia's current and
accumulated earnings and profits is refundable to the Non-United States Holder
upon filing an appropriate claim with the United States Internal Revenue
Service (the "IRS").

   A Non-United States Holder eligible for a reduced rate of United States
withholding tax pursuant to a tax treaty may obtain a refund of any excess
amounts currently withheld by filing an appropriate claim for refund with the
IRS.

Gain on Disposition of Ordinary Common Stock

   A Non-United States Holder generally will not be subject to United States
federal income tax with respect to a gain realized upon the sale or a
disposition of Class A common stock unless: (i) such gain is effectively
connected with a United States trade or business of the Non-United States
Holder, (ii) the Non-United States Holder is an individual who is present in
the United States for a period or periods aggregating 183 days or more during
the taxable year in which such sale or disposition occurs and certain other
conditions are met, or (iii) Adelphia is or has been a "United States real
property holding corporation" within the meaning of Section 897(c)(2) of the
Code at any time within the shorter of the five-year period preceding such
disposition or such holder's holding period and certain other conditions are
met. Although not free from doubt, Adelphia believes that it is not, and has
not been for the last five years, a "United States real property holding
corporation" for federal income tax purposes. If a Non-United States Holder
falls under clause (i) above, the Non-United States holder will be taxed on the
net gain derived from the sale under regular graduated United States federal
income tax rates (and, with respect to corporate Non-United States Holders, may
also be subject to the branch profits tax described above). If an individual
Non-United States Holder falls under clause (ii) above, the Non-United States
Holder generally will be subject to a 30% tax on the gain derived from the
sale, which gain may be offset by United States capital losses recognized
within the same taxable year of such sale.

Backup Withholding and Information Reporting

   Generally, Adelphia must report to the IRS the amount of dividends paid, the
name and address of the recipient, and the amount, if any, of tax withheld.
Subject to certain exceptions, a similar report is sent to the holder. Pursuant
to tax treaties or other agreements, the IRS may make its reports available to
tax authorities in the recipient's country of residence.

   Unless Adelphia has actual knowledge that a holder is a non-United States
person, dividends paid to a holder at an address within the United States may
be subject to backup withholding at a rate of 31% if the holder is not an
exempt recipient as defined in Treasury Regulation Section 1.6049-4(c)(1)(ii)
(which includes corporations) and fails to provide a correct taxpayer
identification number and other information to Adelphia. Backup withholding may
also apply to dividends paid to holders at an address outside the United States
(unless a Non-United States Holder certifies its non-resident status.)

   If the proceeds of the disposition of Class A common stock by a Non-United
States Holder are paid over by or through a United States office of a broker,
the payment is subject to information reporting and to backup withholding at a
rate of 31% unless the disposing holder certifies as to its name, address and
status as a Non-United States Holder under penalties of perjury or otherwise

                                      S-22
<PAGE>

establishes an exemption. Generally, United States information reporting and
backup withholding will not apply to a payment of disposition proceeds if the
payment is made outside the United States through a non-United States office of
a non-United States broker. However, United States information reporting
requirements (but not backup withholding) will apply to a payment of
disposition proceeds outside the United States if (a) the payment is made
through an office outside the United States of a broker that is either (i) a
United States person for United States federal income tax purposes, (ii) a
"controlled foreign corporation" for United States federal income tax purposes,
or (iii) a foreign person which derives 50% or more of its gross income for
certain periods from the conduct of a United States trade or business, and (b)
the broker fails to maintain documentary
evidence in its files that the holder is a Non-United States Holder and that
certain conditions are met or that the holder otherwise is entitled to an
exemption.

   Backup withholding is not an additional tax. Rather, the tax liability of
persons subject to 31% backup withholding will be reduced by the amount of tax
withheld. If withholding results in an overpayment of taxes, a refund may be
obtained, provided that the required information is furnished to the IRS.

   New regulations relating to withholding tax on income paid to foreign
persons (the "New Withholding Regulations") are effective for payments made
after December 31, 2000. Compared with previous regulations, the New
Withholding Regulations modify and, in general, unify the way in which holders
establish their status as non-United States "beneficial owners" eligible for
withholding exemptions including reduced treaty rates or exemptions from backup
withholding. Prospective purchasers are urged to consult their own tax advisors
regarding the application of the New Withholding Regulations.

Estate Tax

   An individual Non-United States Holder who is treated as the owner of Class
A common stock at the time of his or her death or has made certain lifetime
transfers of an interest in Class A common stock will be required to include
the value of such Class A common stock in his or her gross estate for United
States federal estate tax purposes and may be subject to United States federal
estate tax, unless an applicable estate tax treaty provides otherwise.

                                      S-23
<PAGE>

                                  UNDERWRITING

   Subject to the terms and conditions stated in the underwriting agreement,
each underwriter named below has severally agreed to purchase, and we have
agreed to sell to such underwriter, the number of shares of Class A common
stock set forth opposite its name:

<TABLE>
<CAPTION>
                                                                        Number
      Name                                                            of Shares
      ----                                                            ----------
      <S>                                                             <C>
      Banc of America Securities LLC.................................  7,225,000
      Salomon Smith Barney Inc.......................................  7,225,000
      Credit Suisse First Boston Corporation.........................    850,000
      Goldman, Sachs & Co............................................    850,000
      Morgan Stanley & Co. Incorporated..............................    850,000
                                                                      ----------
       Total......................................................... 17,000,000
                                                                      ==========
</TABLE>

   The underwriting agreement provides that the obligations of the several
underwriters to purchase the shares included in this offering are subject to
approval of certain legal matters by counsel and to certain other conditions.
The underwriters are obligated to purchase all the shares (other than those
covered by the over-allotment option described below) if they purchase any of
the shares.

   The underwriters propose to offer some of the shares directly to the public
at the public offering price set forth on the cover page of this prospectus
supplement and some of the shares to certain dealers at the public offering
price less a concession not in excess of $1.07 per share. The underwriters may
allow, and such dealers may reallow, a concession not in excess of $0.10 per
share on sales to certain other dealers. After the initial offering of the
shares to the public, the public offering price and such concessions may be
changed by the representative.

   We have granted to the underwriters an option, exercisable for 30 days from
the date of this prospectus supplement, to purchase up to 2,550,000 additional
shares of Class A common stock at the public offering price less the
underwriting discount. The underwriters may exercise such option solely for the
purpose of covering over-allotments, if any, in connection with this offering.
To the extent such option is exercised, each underwriter will be obligated,
subject to certain conditions, to purchase a number of additional shares
approximately proportionate to such underwriter's initial purchase commitment.

   Adelphia and the Rigas family have agreed that, for a period of 90 days
after the date of this prospectus supplement, they will not, without the prior
written consent of Banc of America Securities LLC and Salomon Smith Barney Inc.
offer, sell, contract to sell or otherwise dispose of any shares of Class A
common stock or any securities convertible into or exercisable or exchangeable
for Class A common stock or grant any options or warrants to purchase shares of
Class A common stock (except in connection with pending acquisitions, other
strategic acquisitions and certain other permitted transactions).

   The Rigas family has agreed, subject to certain exceptions, not to sell any
of their shares of our Class B common stock without the prior written consent
of a majority of the independent members of our Board of Directors for a period
of 180 days from the closing of the January 2001 Rigas Common Stock Direct
Placement, but not to exceed a year from the closing of this Offering.


                                      S-24
<PAGE>

   The Class A common stock is quoted on the Nasdaq National Market under the
symbol "ADLAC."

   The following table shows the underwriting discount and commissions to be
paid to the underwriters by us in connection with this offering.

<TABLE>
      <S>                                                            <C>
      Per Share.....................................................       $1.79
      Total......................................................... $30,430,000
</TABLE>

   In connection with the offering, Banc of America Securities LLC, on behalf
of the underwriters, may over-allot or engage in syndicate covering
transactions, stabilizing transactions and penalty bids. Syndicate covering
transactions involve purchases of the Class A common stock in the open market
after the distribution has been completed in order to cover syndicate short
positions. Stabilizing transactions consist of certain bids or purchases of
Class A common stock made for the purpose of preventing or retarding a decline
in the market price of the Class A common stock while the offering is in
progress. Penalty bids permit the underwriters to reclaim a selling concession
from a syndicate member when Banc of America Securities LLC, in covering
syndicate short positions or making stabilizing purchases, repurchases shares
originally sold by that syndicate member. These activities may cause the price
of the Class A common stock to be higher than the price that otherwise would
exist in the open market in the absence of such transactions. These
transactions may be effected on the Nasdaq National Market or in the over-the-
counter market, or otherwise and, if commenced, may be discontinued at any
time.

   In addition, in connection with this Offering, certain of the underwriters
(and selling group members) may engage in passive market making transactions
in the Class A common stock on the Nasdaq National Market, prior to the
pricing and completion of this Offering. Passive market making consists of
displaying bids on the Nasdaq National Market no higher than the bid prices of
independent market makers and making purchases at prices no higher than those
independent bids and effected in response to order flow. Net purchases by a
passive market maker on each day are limited to a specified percentage of the
passive market maker's average daily trading volume in the Class A common
stock during a specified period and must be discontinued when such limit is
reached. Passive market making may cause the price of the Class A common stock
to be higher than the price that otherwise would exist in the open market in
the absence of such transactions. If passive market making is commenced, it
may be discontinued at any time.

   We estimate that our total expenses of this offering will be $500,000. The
representatives of the underwriters have agreed to reimburse us for certain
expenses in connection with this Offering.

   The underwriters and certain of their affiliates have provided and may in
the future provide investment banking, commercial banking and other financial
services to us and certain of our affiliates for which they have received and
will receive customary fees. All of our underwriters and their affiliates
acted as underwriters of the public debt and common stock of both us and our
affiliates. In addition, certain of the underwriters, or their affiliates,
acted as lenders under our existing credit facilities, including the January
2001 Credit Facility entered into by certain of our subsidiaries and
affiliates. See "Prospectus Supplement Summary--Recent Developments--January
2001 Credit Facility," "Risk Factors--High Level of Indebtedness" and "Use of
Proceeds." Also, because the net proceeds to us from this Offering may be paid
to affiliates of certain of the underwriters to repay existing loans, this
Offering is being conducted in accordance with Rule 2710(c)(8) and Rule 2720
of the NASD.

   We have agreed to indemnify the underwriters against certain liabilities,
including liabilities under the Securities Act, or to contribute to payments
the underwriters may be required to make in respect of any of those
liabilities.


                                     S-25
<PAGE>

                          NOTICE TO CANADIAN RESIDENTS

Resale Restrictions

   The distribution of Class A common stock in Canada is being made only on a
private placement basis exempt from the requirement that we prepare and file a
prospectus with the securities regulatory authorities in each province where
trades of Class A common stock are effected. Accordingly, any resale of Class A
common stock in Canada must be made in accordance with applicable securities
laws which will vary depending on the relevant jurisdiction, and which may
require resales to be made in accordance with available statutory exemptions or
pursuant to a discretionary exemption granted by the applicable Canadian
securities regulatory authority. Purchasers are advised to seek legal advice
prior to any resale of Class A common stock.

Representations of Purchasers

   Each purchaser of Class A common stock in Canada who receives a purchase
confirmation will be deemed to represent to us and the dealer from whom such
purchase confirmation is received that (i) such purchaser is entitled under
applicable provincial securities laws to purchase such Class A common stock
without the benefit of a prospectus qualified under such securities laws, (ii)
where required by law, that such purchaser is purchasing as principal and not
as agent, and (iii) such purchaser has reviewed the text above under "Resale
Restrictions."

Rights of Action (Ontario Purchasers)

   The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
Ontario securities law. As a result, Ontario purchasers must rely on other
remedies that may be available, including common law rights of action for
damages or rescission or rights of action under the civil liability provisions
of the U.S. federal securities laws.

Enforcement of Legal Rights

   All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be
possible for Canadian purchasers to effect service of process within Canada
upon the issuer or such persons. All or a substantial portion of the assets of
the issuer and such persons may be located outside of Canada and, as a result,
it may not be possible to satisfy a judgment against the issuer or such persons
in Canada or to enforce a judgment obtained in Canadian courts against such
issuer or persons outside of Canada.

Notice to British Columbia Residents

   A purchaser of Class A common stock to whom the Securities Act (British
Columbia) applies is advised that such purchaser is required to file with the
British Columbia Securities Commission a report within ten days of the sale of
any Class A common stock acquired by such purchaser pursuant to this offering.
Such report must be in the form attached to British Columbia Securities
Commission Blanket Order BOR #95/17, a copy of which may be obtained from us.
Only one such report must be filed in respect of Class A common stock acquired
on the same date and under the same prospectus exemption.

Taxation and Eligibility for Investment

   Canadian purchasers of Class A common stock should consult their own legal
and tax advisors with respect to the tax consequences of an investment in Class
A common stock in their particular circumstances and with respect to the
eligibility of Class A common stock for investment by the purchaser under
relevant Canadian legislation.

                                      S-26
<PAGE>

                    CONVERTIBLE SUBORDINATED NOTES OFFERING

   Concurrently with the Class A common stock being offered hereby, Adelphia is
offering $750 million aggregate principal amount of 6% Convertible Subordinated
Notes due 2006. These convertible subordinated notes will be convertible by
holders into shares of Class A common stock at an initial conversion price of
$55.49 per share of Class A common stock (equivalent to a conversion rate of
18.0213 shares of Class A common stock per $1,000 principal amount of
convertible subordinated notes). The conversion price would be adjusted for
specified events including stock splits or dividends paid otherwise than in
cash. These convertible subordinated notes will be redeemable at the option of
Adelphia, in whole or in part at any time on and after February 16, 2004 at
specified redemption prices plus accrued and unpaid interest. These convertible
subordinated notes will only be offered by delivery of a separate prospectus
supplement relating to the Convertible Subordinated Notes Offering which
contains a more detailed description of the features of the convertible
subordinated notes. No requirement exists that we sell these convertible
subordinated notes in order to sell Class A common stock in this Offering. We
could decide not to sell these convertible subordinated notes or to sell more
or less convertible subordinated notes than we presently are offering in the
Convertible Subordinated Notes Offering.


                                      S-27
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

   We file annual, quarterly and special reports, as well as proxy statements
and other information with the SEC. You may read and copy any document we file
with the SEC at the SEC's Public Reference Room at 450 Fifth Street, N.W.,
Washington, D.C. 20549 or at its Regional Offices in Chicago, Illinois or New
York, New York. You may obtain further information about the operation of the
Public Reference Room by calling the SEC at 1-800-SEC-0330. Our SEC filings
are also available to the public over the Internet at the SEC's web site at
http://www.sec.gov, which contains reports, proxy statements and other
information regarding registrants like us that file electronically with the
SEC.

   This prospectus supplement is part of a registration statement on Form S-3
filed by us with the SEC under the Securities Act. As permitted by SEC rules,
this prospectus supplement does not contain all of the information included in
the registration statement and the accompanying exhibits filed with the SEC.
You may refer to the registration statement and its exhibits for more
information.

   The SEC allows us to "incorporate by reference" into this prospectus
supplement the information we file with the SEC. This means that we can
disclose important information to you by referring you to those documents. The
information incorporated by reference is considered to be part of this
prospectus supplement. If we subsequently file updating or superseding
information in a document that is incorporated by reference into this
prospectus supplement, the subsequent information will also become part of
this prospectus supplement and will supersede the earlier information.

   We are incorporating by reference the following documents that we have
filed with the SEC:

  .  our Annual Report on Form 10-K for the year ended December 31, 1999, as
     amended by our Form 10-K/A and our Form 10-K/A-2;

  .  our Quarterly Reports on Form 10-Q for the quarters ended
     March 31, 2000, June 30, 2000 and September 30, 2000, in each case as
     amended by our Form 10-Q/As;

  .  our Current Reports on Form 8-K for the events dated January 3, 2001,
     January 1, 2001, December 18, 2000, September 20, 2000, September 15,
     2000, September 13, 2000, June 13, 2000, January 21, 2000, September 9,
     1999 (as amended by our Form 8-K/A filed on January 2, 2001), June 22,
     1999 (as amended by our Form 8-K/A filed on January 2, 2001), and April
     20, 1999 (as amended by our Form 8-K/A filed on January 2, 2001);

  .  our definitive proxy statement dated July 7, 2000 with respect to the
     Annual Meeting of Stockholders held on July 31, 2000 (except that
     Appendix A thereto has been superseded by the Form 10-K/A-2, filed on
     December 19, 2000); and

  .  the description of our Class A common stock contained in our
     registration statement filed with the SEC under Section 12 of the
     Exchange Act and subsequent amendments and reports filed to update such
     description.

   We are also incorporating by reference into this prospectus supplement all
of our future filings with the SEC under Sections 13(a), 13(c), 14 or 15(d) of
the Exchange Act until the Common Stock Offering has been completed.


                                     S-28
<PAGE>

   You may obtain a copy of any of our filings which are incorporated by
reference, at no cost, by writing to or telephoning us at the following
address:

                      Adelphia Communications Corporation
                             One North Main Street
                        Coudersport, Pennsylvania 16915
                         Attention: Investor Relations
                           Telephone: (814) 274-9830

   You should rely only on the information provided in this prospectus
supplement or incorporated by reference. We have not authorized anyone to
provide you with different information. You should not assume that the
information in this prospectus supplement is accurate as of any date other than
the date on the first page of this prospectus supplement. We are not making
this offer of securities in any state or country in which the offer or sale is
not permitted.

                                 LEGAL MATTERS

   The validity of the Class A common stock will be passed upon for us by
Buchanan Ingersoll Professional Corporation, Pittsburgh, Pennsylvania.
Attorneys of that firm who are representing us in the Common Stock Offering own
an aggregate of 7,350 shares of our Class A common stock and 41,600 shares of
Adelphia Business Solutions Class A common stock. The validity of the Class A
common stock offered hereby will be passed upon on behalf of the underwriters
by Latham & Watkins, New York, New York.

                                    EXPERTS

   The consolidated financial statements of Adelphia and its subsidiaries as of
December 31, 1998 and 1999, and for the year ended March 31, 1998, the nine
months ended December 31, 1998 and the year ended December 31, 1999,
incorporated in this prospectus supplement by reference from Adelphia's Annual
Report on Form 10-K, as amended by Form 10-K/A-2, for the year ended December
31, 1999, have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their report, which is incorporated herein by reference (which report
expresses an unqualified opinion and includes an explanatory paragraph
referring to the restatement described in Note 14 to the consolidated financial
statements), and have been so incorporated in reliance upon the report of such
firm given upon their authority as experts in accounting and auditing.

   The consolidated financial statements of FrontierVision Partners, L.P. and
subsidiaries as of December 31, 1998 and 1997, and for each of the years in the
three year period ended December 31, 1998, have been incorporated by reference
herein from Adelphia's Current Report on Form 8-K filed September 9, 1999, in
reliance upon the report of KPMG LLP, independent certified public accountants,
incorporated by reference herein, and upon the authority of said firm as
experts in accounting and auditing.

   The consolidated financial statements of Harron Communications Corp. and
subsidiaries as of December 31, 1998 and 1997, and for each of the three years
in the period ended December 31, 1998, incorporated in this prospectus
supplement by reference from Adelphia's Current Report on Form 8-K filed
September 9, 1999, have been audited by Deloitte & Touche LLP, independent
auditors, as stated in their report, which is incorporated herein by reference,
and have been so

                                      S-29
<PAGE>

incorporated in reliance upon the report of such firm given upon their
authority as experts in accounting and auditing.

   The consolidated financial statements of Century Communications Corp. and
subsidiaries as of May 31, 1998 and 1997 and for each of the three years in the
period ended May 31, 1998, incorporated by reference in this prospectus
supplement from Adelphia's Current Report on Form 8-K filed April 20, 1999, and
the consolidated financial statements of Century Communications Corp. and
subsidiaries as of May 31, 1999 and 1998 and for each of the three years in the
period ended May 31, 1999, incorporated by reference in this prospectus
supplement from Adelphia's Current Report on Form 8-K filed September 9, 1999
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their reports, which are incorporated herein by reference, and have been so
incorporated in reliance upon the reports of such firm given upon their
authority as experts in accounting and auditing.

                                      S-30
<PAGE>

                                   Prospectus

                      ADELPHIA COMMUNICATIONS CORPORATION

                                Debt Securities
                                Preferred Stock
                              Class A Common Stock
                              Class B Common Stock

This prospectus relates to:

 .  Adelphia Communications Corporation's debentures, notes and other debt
   securities in one or more series which may be senior debt securities or
   subordinated debt securities,

 .  shares of preferred stock of Adelphia issuable in series designated by the
   board of directors of Adelphia,

 .  shares of Class A common stock, and

 .  shares of Class B common stock, which may be offered in combination or
   separately from time to time by Adelphia.

   The aggregate initial offering price of all of the securities which may be
sold pursuant to this prospectus will not exceed U.S. $5,000,000,000, or its
equivalent based on the applicable exchange rate at the time of issue in one or
more foreign currencies or currency units as shall be designated by Adelphia.

   The Class A common stock is quoted on the Nasdaq National Market. The Class
A common stock's ticker symbol is "ADLAC." On May 6, 1999, the closing sale
price on the Nasdaq National Market of a single share of Class A common stock
was $75.25.

   Our common stock includes Class A and Class B common stock. The rights of
holders of the Class A common stock and Class B common stock differ with
respect to certain aspects of dividends, liquidations and voting. The Class A
common stock has preferential rights with respect to cash dividends and
distributions upon the liquidation of Adelphia. Holders of Class B common stock
are entitled to greater voting rights than the holders of Class A common stock;
however, the holders of Class A common stock, voting as a separate class, are
entitled to elect one of Adelphia's directors.

   You should carefully review "Risk Factors" beginning on page 4 for a
discussion of things you should consider when investing in securities of
Adelphia.

                               ----------------

   Neither the SEC nor any state securities commission has approved or
disapproved of these securities or passed upon the adequacy or accuracy of this
prospectus. Any representation to the contrary is a criminal offense.

   This Prospectus May Not Be Used To Consummate Sales Of Securities Unless
Accompanied By A Prospectus Supplement.

                               ----------------

                  The date of this Prospectus is May 14, 1999.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<S>                                                                          <C>
Adelphia...................................................................    2

Risk Factors...............................................................    4

Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends..   16

Dilution...................................................................   17

Use of Proceeds............................................................   17

Description of Debt Securities.............................................   18

Description of Capital Stock...............................................   31

Book Entry Issuance........................................................   36

Plan of Distribution.......................................................   38

Where You Can Find More Information........................................   40

Legal Matters..............................................................   41

Experts....................................................................   42
</TABLE>
<PAGE>


                                    ADELPHIA

   Adelphia is a leader in the telecommunications industry with cable
television and local telephone operations. Our operations consist of providing
telecommunications services primarily over our networks, which are commonly
referred to as broadband networks because they can transmit large quantities of
voice, video and data by way of digital or analog signals. As of December 31,
1998, we owned or managed cable television systems with broadband networks that
passed in front of 3,252,830 homes and served 2,304,325 basic subscribers. John
J. Rigas, the Chairman, President, Chief Executive Officer and founder of
Adelphia, has owned and operated cable television systems since 1952.

   We own cable systems in twelve states which are organized into seven
regional clusters: Western New York, Virginia, Western Pennsylvania, New
England, Eastern Pennsylvania, Ohio and New Jersey. These systems are located
primarily in suburban areas of large and medium-sized cities within the 50
largest television markets. As of December 31, 1998, the broadband networks for
these systems passed in front of 2,131,978 homes and served 1,528,307 basic
subscribers.

   We also provide management and consulting services to other partnerships and
corporations engaged in the ownership and operation of cable television
systems. John J. Rigas and members of his immediate family, including entities
they own or control, have substantial ownership interests in these partnerships
and corporations. As of December 31, 1998, the broadband networks for cable
systems owned by these Rigas family partnerships and corporations passed in
front of 177,250 homes and served 134,443 basic subscribers.

   We also own a 50% voting interest and nonvoting preferred limited
partnership interests in Olympus Communications, L.P. Olympus is a joint
venture limited partnership that operates a large cable system in Florida. As
of December 31, 1998, the broadband networks for this system passed in front of
943,602 homes and served 641,575 basic subscribers.

   Through our subsidiary, Hyperion Telecommunications, Inc., we own and
operate a large competitive local exchange carrier in the eastern United
States. This means that Hyperion provides its customers with alternatives to
the incumbent local telephone company for local telephone and
telecommunications services. Hyperion's telephone operations are referred to as
being facilities based, which means it generally owns the local
telecommunications networks and facilities it uses to deliver these services,
rather than leasing or renting the use of another party's networks to do so. As
of December 31, 1998, Hyperion managed and operated 22 telecommunications
networks, including two under construction, serving 46 markets. Hyperion's
Class A common stock is listed on the Nasdaq National Market under the symbol
"HYPT."

   Our executive offices are located at Main at Water Street, Coudersport,
Pennsylvania 16915, and our telephone number is (814) 274-9830.

                                       2
<PAGE>


Recent Developments

   Please see the applicable prospectus supplement and Adelphia's recent public
filings for recent developments.

                                       3
<PAGE>

                                  RISK FACTORS

   Before you invest in Adelphia's securities, you should be aware that there
are various risks, including those described below. You should consider
carefully these risk factors together with all of the other information
included in this prospectus before you decide to purchase any securities of
Adelphia.

High Level Of
Indebtedness

   As of December 31,      Adelphia has a substantial amount of debt. We
1998, we owed              borrowed this money to purchase and to expand our
approximately $3.5         cable systems and other operations and, to a lesser
billion. Our high level    extent, for investments and loans to our
of indebtedness can have   affiliates. At December 31, 1998, our indebtedness
important adverse          totaled approximately $3,527,452,000. This included
consequences to us and     approximately:
to you.

                              .  $1,810,212,000 of Adelphia Parent Company
                                 public debt. When we use the term "Adelphia
                                 Parent Company" in this prospectus, we are
                                 referring only to Adelphia Communications
                                 Corporation as a parent holding company
                                 entity, and not to its subsidiaries;

                              .  $1,246,456,000 of debt owed by our
                                 subsidiaries to banks, other financial
                                 institutions and other persons; and

                              .  $470,784,000 of public debt owed by Hyperion.

   Debt service consumes   Our high level of indebtedness can have important
a substantial portion of   adverse consequences to us and to you. It requires
the cash we generate.      that we spend a substantial portion of the cash we
This could affect our      get from our business to repay the principal and
ability to invest in our   interest on these debts. Otherwise, we could use
business in the future     these funds for general corporate purposes or for
as well as to react to     capital improvements. Our ability to obtain new
changes in our industry    loans for working capital, capital expenditures,
or economic downturns.     acquisitions or capital improvements may be limited
                           by our current level of debt. In addition, having
                           such a high level of debt could limit our ability
                           to react to changes in our industry and to economic
                           conditions generally. In addition to our debt, at
                           December 31, 1998, the Adelphia Parent Company also
                           had approximately $148,191,000 and Hyperion had
                           approximately $228,674,000 of redeemable
                           exchangeable preferred stock which contain payment
                           obligations that are

                                       4
<PAGE>

                           similar to our debt obligations in these respects.
                           Olympus also has a substantial amount of debt.

   Approximately 32% of    Our debt comes due at various times up to the year
this debt must be paid     2009, including an aggregate of approximately
by April 1, 2003 and all   $1,126,169,000 which, as of December 31, 1998, we
of it must be paid by      must pay by April 1, 2003.
2009.

Our Business Requires      Our business requires substantial additional
Substantial Additional     financing on a continuing basis for capital
Financing And If We Do     expenditures and other purposes including:
Not Obtain That
Financing We May Not Be       .  constructing and upgrading our plant and
Able To Upgrade Our              networks--some of these upgrades we must make
Plant, Offer Services,           to comply with the requirements of local
Make Payments When Due           cable franchise authorities;
Or Refinance Existing
Debt.                         .  offering new services;

                              .  scheduled principal and interest payments;

                              .  refinancing existing debt; and

                              .  acquisitions and investments.

                           There can be no guarantee that we will be able to
                           issue additional debt or sell stock or other
                           additional equity on satisfactory terms, or at all,
                           to meet our future financing needs.

We Have Had Large Losses   The Total Convertible Preferred Stock, Common Stock
And Negative               and Other Stockholders' Equity (Deficiency) at
Stockholders' Equity And   December 31, 1998 was a deficit of approximately
We Expect This To          $1,021,746,000. Our continuing net losses, which
Continue                   are mainly due to our high levels of depreciation
                           and amortization and interest expense, have created
                           this deficiency. Our recent net losses applicable
                           to our common stockholders were approximately as
                           follows for the periods specified:

                              .  fiscal year ended March 31, 1996--
                                 $119,894,000;

                              .  fiscal year ended March 31, 1997--
                                 $130,642,000;

                              .  fiscal year ended March 31, 1998--
                                 $192,729,000; and

                              .  nine months ended December 31, 1998--
                                 $135,848,000.

                                       5
<PAGE>

                           We expect to continue to incur large net losses for
                           the next several years.

   Our earnings have       Our earnings could not pay for our combined fixed
been insufficient to pay   charges and preferred stock dividends during these
for our fixed charges      periods by the amounts set forth in the table
and preferred stock        below, although combined fixed charges and
dividends.                 preferred stock dividends included substantial non-
                           cash charges for depreciation, amortization and
                           non-cash interest expense on some of our debts and
                           the non-cash expense of Hyperion's preferred stock
                           dividends:

<TABLE>
<CAPTION>
                                         Earnings     Non-Cash
                                        Deficiency    Charges
                                       ------------ ------------
                 <S>                   <C>          <C>
                 .  fiscal year ended
                    March 31, 1996     $ 78,189,000 $127,319,000
                 .  fiscal year ended
                    March 31, 1997     $ 61,848,000 $165,426,000
                 .  fiscal year ended
                    March 31, 1998     $113,941,000 $195,153,000
                 .  nine months ended
                    December 31, 1998  $116,899,000 $186,022,000
</TABLE>

                           Historically, the cash we generate from our
   If we could not         operating activities and borrowings has been
refinance our debt or      sufficient to meet our requirements for debt
obtain new loans, we       service, working capital, capital expenditures, and
would likely have to       investments in and advances to our affiliates, and
consider various options   we have depended on getting additional borrowings
such as the sale of        to meet our liquidity requirements. Although in the
additional equity or       past we have been able both to refinance our debt
some of our assets to      and to obtain new debt, there can be no guarantee
meet the principal and     that we will be able to continue to do so in the
interest payments we       future or that the cost to us or the other terms
owe, negotiate with our    which would affect us would be as favorable to us
lenders to restructure     as our current loans and credit agreements. We
existing loans or          believe that our business will continue to generate
explore other options      cash and that we will be able to obtain new loans
available under            to meet our cash needs. However, the covenants in
applicable laws            the indentures and credit agreements for our
including those under      current debt limit our ability to borrow more
reorganization or          money.
bankruptcy laws. We can
not guarantee that any
options available to us
would enable us to repay
our debt in full.


                                       6
<PAGE>

Competition

   Our cable television    The telecommunications services provided by
business is subject to     Adelphia are subject to strong competition and
strong competition from    potential competition from various sources. Our
several sources which      cable television systems compete with other means
could adversely affect     of distributing video to home televisions such as
revenue or revenue         Direct Broadcast Satellite systems, commonly known
growth.                    as DBS systems, and Multichannel Multipoint
                           Distribution systems. Some of the regional Bell
                           telephone operating companies and other local
                           telephone companies are in the process of entering
                           the video-to-home business and several have
                           expressed their intention to enter the video-to-
                           home business. In addition, some regional Bell
                           operating companies and local telephone companies
                           have facilities which are capable of delivering
                           cable television service. The equipment which
                           telephone companies use in providing local exchange
                           service may give them competitive advantages over
                           us in distributing video to home televisions. The
                           regional Bell operating companies and other
                           potential competitors have much greater resources
                           than Adelphia and would constitute formidable
                           competition for our cable television business. We
                           cannot predict either the extent to which
                           competition will continue to materialize or, if
                           such competition materializes, the extent of its
                           effect on our cable television business.

                           We also face competition from other communications
                           and entertainment media, including conventional
                           off-air television broadcasting services,
                           newspapers, movie theaters, live sporting events
                           and home video products. We cannot predict the
                           extent to which competition may affect us.

   Hyperion's operations   In each of the markets served by Hyperion's
are also subject to risk   networks, the competitive local exchange carrier
because Hyperion           services offered by Hyperion compete principally
competes principally       with the services offered by the incumbent local
with established local     telephone exchange carrier company serving that
telephone carriers that    area. Local telephone companies have long-standing
have long-standing         relationships with their customers, have the
utility relationships      potential to subsidize competitive services from
with their customers and   monopoly service revenues, and benefit from
pricing flexibility for    favorable state and federal regulations. The merger
local telephone            of Bell Atlantic and NYNEX created a very large
services.                  company whose combined territory covers a
                           substantial portion of Hyperion's markets. Other
                           combinations are occurring in the industry, which
                           may have a material adverse effect on Hyperion and
                           us.

                                       7
<PAGE>

                           We believe that local telephone companies will gain
                           increased pricing flexibility from regulators as
                           competition increases. Hyperion's operating results
                           and cash flow could be materially and adversely
                           affected by actions by regulators, including
                           permitting the incumbent local telephone companies
                           in Hyperion's markets to do the following:

                              .  lower their rates substantially;

                              .  engage in aggressive volume and term discount
                                 pricing practices for their customers; or

                              .  charge excessive fees to Hyperion for
                                 interconnection to the incumbent local
                                 telephone company's networks.

   If the regional Bell    The regional Bell operating companies can now
telephone companies        obtain regulatory approval to offer long distance
could get regulatory       services if they comply with the interconnection
approval to offer long     requirements of the federal Telecommunications Act
distance service in        of 1996. To date, the FCC has denied the requests
competition with           for approval filed by regional Bell operating
Hyperion's significant     companies in Hyperion's operating areas. However,
customers, some of         an approval of such a request could result in
Hyperion's major           decreased market share for the major long distance
customers could lose       carriers which are among Hyperion's significant
market share.              customers. This could have a material adverse
                           effect on Hyperion.

   The regional Bell       Some of the Regional Bell operating companies have
telephone companies        also recently filed petitions with the FCC
continue to seek other     requesting waivers of other obligations under the
regulatory approvals       federal Telecommunications Act of 1996. These
that could significantly   involve services Hyperion also provides such as
enhance their              high-speed data, long distance, and services to
competitive position       Internet Service Providers. If the FCC grants the
against Hyperion.          regional Bell operating companies' petitions, this
                           could have a material adverse effect on Hyperion.

   Potential competitors   Potential competitors for Hyperion include other
to Hyperion's              competitive local exchange carriers, incumbent
telecommunications         local telephone companies which are not subject to
services include the       regional Bell operating companies' restrictions on
regional Bell telephone    offering long distance service, AT&T, MCIWorldCom,
companies, AT&T,           Sprint and other long distance carriers, cable
MCIWorldCom and Sprint,    television companies, electric utilities, microwave
electric utilities and     carriers, wireless telecommunications providers and
other companies that       private networks built by large end users. Both
have advantages over       AT&T and MCIWorldCom have announced that they have
Hyperion.                  begun to offer local telephone services in some
                           areas of the country, and AT&T recently announced a
                           new wireless technology

                                       8
<PAGE>

                           for providing local telephone service. AT&T and
                           Tele-Communications, Inc. have merged. Although
                           Hyperion has good relationships with the long
                           distance carriers, they could build their own
                           facilities, purchase other carriers or their
                           facilities, or resell the services of other
                           carriers rather than use Hyperion's services when
                           entering the market for local exchange services.

                           Many of Hyperion's current and potential
                           competitors, particularly incumbent local telephone
                           companies, have financial, personnel and other
                           resources substantially greater than those of
                           Hyperion, as well as other competitive advantages
                           over Hyperion.

We Are Subject To
Extensive Regulation

   Our cable television    The cable television industry and the provision of
and telecommunications     local telephone exchange services are subject to
businesses are heavily     extensive regulation at the federal, state and
regulated as to rates we   local levels, and many aspects of such regulation
can charge and other       are currently the subject of judicial proceedings
matters. This regulation   and administrative or legislative proposals. In
could limit our ability    particular, the FCC adopted regulations that limit
to increase rates, cause   our ability to set and increase rates for our basic
us to decrease then        and cable programming service packages and for the
current rates or require   provision of cable television-related equipment.
us to refund previously    The law permits certified local franchising
collected fees.            authorities to order refunds of rates paid in the
                           previous twelve-month period determined to be in
                           excess of the permitted reasonable rates. It is
                           possible that rate reductions or refunds of
                           previously collected fees may be required in the
                           future.

                           The cable television industry is subject to state
                           and local regulations and we must comply with rules
                           of the local franchising authorities to retain and
                           renew our cable franchises, among other matters.
                           There can be no assurances that the franchising
                           authorities will not impose new and more
                           restrictive requirements as a condition to
                           franchise renewal.

                                       9
<PAGE>

   The federal             The federal Telecommunications Act of 1996
Telecommunications Act     substantially changed federal, state and local laws
of 1996 may have a         and regulations governing our cable television and
significant impact on      telecommunications businesses. This law could
our cable television and   materially affect the growth and operation of the
telephone businesses.      cable television industry and the cable services we
                           provide. Although this legislation may lessen
                           regulatory burdens, the cable television industry
                           may be subject to new competition as a result.
                           There are numerous rulemakings that have been and
                           continue to be undertaken by the FCC which will
                           interpret and implement the provisions of this law.
                           Furthermore, portions of this law have been, and
                           likely other portions will be, challenged in the
                           courts. We cannot predict the outcome of such
                           rulemakings or lawsuits or the shortand long-term
                           effect, financial or otherwise, of this law and FCC
                           rulemakings on us.

                           Similarly, the Telecommunications Act of 1996
                           removes entry barriers for all companies and could
                           increase substantially the number of competitors
                           offering comparable services in Hyperion's markets
                           or potential markets. Furthermore, we cannot
                           guarantee that rules adopted by the FCC or state
                           regulators or other legislative or judicial
                           initiatives relating to the telecommunications
                           industry will not have a material adverse effect on
                           Hyperion.

Unequal Voting Rights Of   Adelphia has two classes of common stock--Class A
Stockholders               which carries one vote per share and Class B which
                           carries ten votes per share. Under our Certificate
                           of Incorporation, the Class A shares elect only one
                           of our directors.

Control Of Voting Power    As of May 1, 1999, the Rigas family beneficially
By The Rigas Family        owned outstanding shares representing about 42% of
                           the total number of outstanding shares of both
   The Rigas family can    classes of Adelphia's common stock and about 77% of
control stockholder        the total voting power of Adelphia's shares. The
decisions on very          public holds a majority of the outstanding Class A
important matters.         shares, although the Rigas family also owns about
                           30% of those shares as of May 1, 1999. The Rigas
                           family owns about 99% of Adelphia's Class B shares.
                           The Rigas family also owns shares of Adelphia's
                           8 1/8% Series C Cumulative Convertible preferred
                           stock which, if converted, would increase its
                           voting power and beneficial ownership. The Rigas
                           family also has agreed to acquire 4,114,549 shares
                           of Class B common stock, and has rights to acquire
                           up to an additional 2,057,275 shares of Class B

                                       10
<PAGE>

                           common stock. As a result of the Rigas family's
                           stock ownership and an agreement among the Class B
                           stockholders, members of the Rigas family as of May
                           1, 1999 have the power to elect seven of eight
                           Adelphia directors, and if they converted their
                           convertible preferred stock might be able to elect
                           all eight directors. In addition, the Rigas family
                           could control stockholder decisions on other
                           matters such as amendments to our Certificate of
                           Incorporation and Bylaws, and mergers or other
                           fundamental corporate transactions.

There Are Potential        John J. Rigas and the other executive officers of
Conflicts Of Interest      Adelphia, including other members of the Rigas
Between Adelphia And The   family, own other corporations and partnerships,
Rigas Family               which are managed by us for a fee. Subject to the
                           restrictions contained in a business opportunity
                           agreement regarding future acquisitions, Rigas
                           family members and the executive officers are free
                           to continue to own these interests and acquire
                           additional interests in cable television systems.
                           These activities could present a conflict of
                           interest with us, such as how much time our
                           executive officers devote to our business. In
                           addition, there have been and will continue to be
                           transactions between us and the executive officers
                           or the other entities they own or have affiliations
                           with. Our public debt indentures contain covenants
                           that place some restrictions on transactions
                           between us and our affiliates.

Holding Company            The Adelphia Parent Company directly owns no
Structure And Potential    significant assets other than stock, partnership
Impact Of Restrictive      interests, equity and other interests in our
Covenants In Subsidiary    subsidiaries and in other companies. This creates
Debt Agreements            risks regarding our ability to provide cash to the
                           Adelphia Parent Company to repay the interest and
                           principal which it owes, our ability to pay cash
                           dividends to our common stockholders in the future,
                           and the ability of our subsidiaries and other
                           companies to respond to changing business and
                           economic conditions and to get new loans.

   The Adelphia Parent     The public indentures, and the credit agreements
Company depends on its     for bank and other financial institution loans, of
subsidiaries and other     our subsidiaries and other companies restrict their
companies in which it      ability and the ability of the companies they own
has investments, to fund   to make payments to the Adelphia Parent Company.
its cash needs.            These agreements also place other restrictions on
                           the borrower's ability to borrow new funds and
                           include requirements for the borrowers to remain in

                                       11
<PAGE>

                           compliance with the loans. The ability of a
                           subsidiary or a company in which we have invested
                           to comply with debt restrictions may be affected by
                           events that are beyond our control. The breach of
                           any of these covenants could result in a default
                           which could result in all loans and other amounts
                           owed to its lenders, to be due and payable. Our
                           subsidiaries and companies in which we have
                           invested might not be able to repay in full the
                           accelerated loans.

It Is Unlikely You Will    Adelphia has never declared or paid cash dividends
Receive A Return On Your   on any of its common stock and has no intention of
Shares Through The         doing so in the foreseeable future. As a result, it
Payment Of Cash            is unlikely that you will receive a return on your
Dividends                  shares through the payment of cash dividends.

Future Sales Of            Sales of a substantial number of shares of Class A
Outstanding Common Stock   common stock or Class B common stock, including
Could Adversely Affect     sales by any pledgees of such shares, could
The Market Price Of Our    adversely affect the market price of our Class A
Common Stock               common stock and could impair our ability in the
                           future to raise capital through stock offerings.
                           Under various registration rights agreements or
                           arrangements, as of May 1, 1999, the Rigas family
                           has the right, subject to some limitations, to
                           require Adelphia to register substantially all of
                           the shares which it owns of the Class A common
                           stock--15,029,119 shares, Class B common stock--
                           10,736,544 shares and the equivalent number of
                           shares of Class A common stock into which they may
                           be converted, and convertible preferred stock--
                           80,000 shares and the 9,433,962 shares of Class A
                           common stock into which they may be converted.
                           Among others, Adelphia has registered or agreed to
                           register for public sale the following shares:

                              .  for the Rigas family--up to 11,000,000 shares
                                 of Class A common stock, 80,000 shares of
                                 convertible preferred stock and the Class A
                                 common stock issuable upon conversion of the
                                 convertible preferred stock;

                              .  for Booth American Company--3,571,428 shares
                                 of Class A common stock owned as of March 24,
                                 1998;

                                       12
<PAGE>

                              .  for the selling stockholders receiving shares
                                 in the Verto Communications, Inc.
                                 acquisition--2,561,024 shares of Class A
                                 common stock;

                              .  for a Rigas family partnership--4,000,000
                                 shares of Class A common stock purchased by
                                 it in connection with the January 14, 1999
                                 equity offerings;

                              .  for the owners of FrontierVision Partners,
                                 L.P.--7,000,000 shares of Class A common
                                 stock in connection with the FrontierVision
                                 acquisition pending as of May 1, 1999, and
                                 for the benefit of FrontierVision in certain
                                 circumstances if that transaction does not
                                 close, 1,000,000 shares of Class A common
                                 stock; and

                              .  in connection with the Century Communications
                                 Corp. acquisition pending as of May 1, 1999,
                                 Adelphia expects to register approximately
                                 48,700,000 shares of Class A common stock.

                           Approximately 14,904,000 shares of Class A common
                           stock and up to 80,000 shares of convertible
                           preferred stock, including the underlying Class A
                           common stock, have been pledged in connection with
                           margin loans made to members of the Rigas family.
                           These pledgees could freely sell any shares
                           acquired upon a foreclosure.

Purchasers Of Our Common   Persons purchasing common stock will incur
Stock Will Incur           immediate and substantial net tangible book value
Immediate Dilution         dilution.


Adelphia's Acquisitions    Because we are experiencing a period of rapid
And Expansion Could        expansion through acquisition, the operating
Involve Operational        complexity of Adelphia, as well as the
Risks                      responsibilities of management personnel, have
                           increased. Our ability to manage such expansion
                           effectively will require us to continue to expand
                           and improve our operational and financial systems
                           and to expand, train and manage its employee base.

                           The Century, FrontierVision and Harron
                           Communications Corp. acquisitions, all pending as
                           of May 1, 1999, involve the acquisition of
                           companies that have previously operated
                           independently. We may not be able to integrate the

                                       13
<PAGE>

                           operations of these companies without some level of
                           difficulty, such as the loss of key personnel.
                           There is no guarantee that we will be able to
                           realize the benefits expected from the integration
                           of operations from these transactions.

                           Because the cable systems in our pending
                           acquisitions are in the same industry as those of
                           Adelphia, the acquired systems will generally be
                           subject to the same risks as those of Adelphia,
                           such as those relating to competition, regulation,
                           year 2000 issues and technological developments.

Year 2000 Issues Present   The year 2000 issue refers to the inability of
Risks To Our Business      computerized systems and technologies to recognize
Operations In Several      and process dates beyond December 31, 1999. This
Ways                       could present risks to the operation of our
                           business in several ways. Our computerized business
                           applications that could be adversely affected by
                           the year 2000 issue include:

                              .  information processing and financial
                                 reporting systems;

                              .  customer billing systems;

                              .  customer service systems;

                              .  telecommunication transmission and reception
                                 systems; and

                              .  facility systems.

                           System failure or miscalculation could result in an
                           inability to process transactions, send invoices,
                           accept customer orders or provide customers with
                           products and services. Although we are evaluating
                           the impact of the year 2000 issue on our business
                           and are seeking to implement necessary solutions,
                           this process has not been completed.

                           There can be no assurance that the systems of other
                           companies on which our systems rely will be year
                           2000 ready or timely converted into systems
                           compatible with our systems. Our failure or a
                           third-party's failure to become year 2000 ready, or
                           our inability to become compatible with third
                           parties with which we have a material relationship,
                           may have a material adverse effect on us, including
                           significant service interruption or outages;
                           however, we cannot currently estimate the extent of
                           any such adverse effects.

                                       14
<PAGE>

Forward-Looking
Statements In This         The statements contained or incorporated by
Prospectus Are Subject     reference in this prospectus that are not
To Risks And               historical facts are "forward-looking statements"
Uncertainties              and can be identified by the use of forward-looking
                           terminology such as "believes," "expects," "may,"
                           "will," "should," "intends" or "anticipates" or the
                           negative thereof or other variations thereon or
                           comparable terminology, or by discussions of
                           strategy that involve risks and uncertainties.

                           Certain information set forth or incorporated by
                           reference in this prospectus, including
                           "Management's Discussion and Analysis of Financial
                           Condition and Results of Operations" in Adelphia's
                           1998 Annual Report on Form 10-K and in Adelphia's
                           Form 10-Qs, is forward-looking, such as information
                           relating to the effects of future regulation,
                           future capital commitments and the effects of
                           competition. Such forward-looking information
                           involves important risks and uncertainties that
                           could significantly affect expected results in the
                           future from those expressed in any forward-looking
                           statements made by, or on behalf of, us. These
                           risks and uncertainties include, but are not
                           limited to, uncertainties relating to economic
                           conditions, the availability and cost of capital,
                           acquisitions and divestitures, government and
                           regulatory policies, the pricing and availability
                           of equipment, materials, inventories and
                           programming, technological developments, year 2000
                           issues and changes in the competitive environment
                           in which we operate. Persons reading this
                           prospectus are cautioned that such statements are
                           only predictions and that actual events or results
                           may differ materially. In evaluating such
                           statements, readers should specifically consider
                           the various factors which could cause actual events
                           or results to differ materially from those
                           indicated by such forward-looking statements.

                                       15
<PAGE>

                RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND
                           PREFERRED STOCK DIVIDENDS

   The following table sets forth the ratio of earnings to combined fixed
charges and preferred stock dividends of Adelphia for the periods indicated.
For purposes of calculating the ratio of earnings available to cover combined
fixed charges and preferred stock dividends:

  .  earnings consist of loss before income taxes and extraordinary items
     plus fixed charges, excluding capitalized interest, and

  .  fixed charges consist of interest, whether expensed or capitalized, plus
     amortization of debt issuance costs plus the assumed interest component
     of rent expense.

<TABLE>
<CAPTION>
                                       Fiscal Year Ended March 31,
-------------------------------------------------------------------------------------------------------------
   1994                   1995                    1996                      1997                     1998
   ----                   ----                    ----                      ----                     ----
   <S>                    <C>                     <C>                       <C>                      <C>
    --                     --                      --                        --                       --
</TABLE>

   For the years ended March 31, 1994, 1995, 1996, 1997 and 1998, and the nine
months ended December 31, 1998, Adelphia's earnings were insufficient to cover
its combined fixed charges and preferred stock dividends by approximately
$65,997,000, $69,146,000, $78,189,000, $61,848,000, $113,941,000, and
$116,899,000, respectively.

                                       16
<PAGE>

                                    DILUTION

   The net tangible book value of Adelphia's common stock as of December 31,
1998 was a deficit of approximately $2,050,905,000 or negative $48.72 a share.
Net tangible book value per share represents the amount of Adelphia's
convertible preferred stock, common stock and other stockholders' equity
(deficiency), less intangible assets, divided by shares of Adelphia's common
stock outstanding. Purchasers of common stock will have an immediate dilution
of net tangible book value which, due to our having a net tangible book value
deficit, will exceed the purchase price per share. For example, in the January
14, 1999 equity offerings, the purchase price of a single share initially sold
to the public was $45.00 and the net tangible book value dilution per share was
$78.53 based on net tangible book value as of December 31, 1998. Net tangible
book value dilution per share represents the difference between the amount per
share paid by purchasers of shares of Class A common stock in an offering by
Adelphia and the pro forma net tangible book value per share of the common
stock immediately after completion of such offering.

                                USE OF PROCEEDS

   Unless otherwise specified in the applicable prospectus supplement, we
intend to apply the net proceeds from the sale of the securities to which this
prospectus relates to general funds to be used for general corporate purposes
including capital expenditures, acquisitions, the reduction of indebtedness,
investments and other purposes. We may invest funds not required immediately
for such purposes in short-term obligations or we may use them to reduce the
future level of our indebtedness.

                                       17
<PAGE>

                         DESCRIPTION OF DEBT SECURITIES

   The following description sets forth general terms and provisions of the
debt securities to which any prospectus supplement may relate. We will describe
the particular terms and provisions of the series of debt securities offered by
a prospectus supplement, and the extent to which such general terms and
provisions described below may apply thereto, in the prospectus supplement
relating to such series of debt securities.

   The senior debt securities are to be issued in one or more series under an
indenture, as supplemented or amended from time to time between Adelphia and an
institution that we will name in the related prospectus supplement, as trustee.
For ease of reference, we will refer to the indenture relating to senior debt
securities as the senior indenture and we will refer to the trustee under that
indenture as the senior trustee. The subordinated debt securities are to be
issued in one or more series under an indenture, as supplemented or amended
from time to time, between Adelphia and an institution that we will name in the
related prospectus supplement, as trustee. For ease of reference, we will refer
to the indenture relating to subordinate debt securities as the subordinate
indenture and we will refer to the trustee under that indenture as the
subordinate trustee. This summary of certain terms and provisions of the debt
securities and the indentures is not necessarily complete, and we refer you to
the copy of the form of the indentures which are filed as an exhibit to the
registration statement of which this prospectus forms a part, and to the Trust
Indenture Act. Whenever we refer to particular defined terms of the indentures
in this Section or in a prospectus supplement, we are incorporating these
definitions into this prospectus or the prospectus supplement.

General

   The debt securities will be issuable in one or more series pursuant to an
indenture supplemental to the applicable indenture or a resolution of
Adelphia's board of directors or a committee of the board. Unless otherwise
specified in a prospectus supplement, each series of senior debt securities
will rank pari passu in right of payment with all of Adelphia Parent Company's
other senior unsecured obligations. Each series of subordinated debt securities
will be subordinated and junior in right of payment to the extent and in the
manner set forth in the subordinated indenture and the supplemental indenture
relating to that debt. Except as otherwise provided in a prospectus supplement,
the indentures do not limit the incurrence or issuance of other secured or
unsecured debt of Adelphia, whether under the indentures, any other indenture
that Adelphia may enter into in the future or otherwise. For more information,
you should read the prospectus supplement relating to a particular offering of
securities.

   The applicable prospectus supplement or prospectus supplements will describe
the following terms of each series of debt securities:

  .  the title of the debt securities and whether such series constitutes
     senior debt securities or subordinated debt securities;

  .  any limit upon the aggregate principal amount of the debt securities;

                                       18
<PAGE>

  .  the date or dates on which the principal of the debt securities is
     payable or the method of that determination or the right, if any, of
     Adelphia to defer payment of principal;

  .  the rate or rates, if any, at which the debt securities will bear
     interest (including reset rates, if any, and the method by which any
     such rate will be determined), the interest payment dates on which
     interest will be payable and the right, if any, of Adelphia to defer any
     interest payment;

  .  the place or places where, subject to the terms of the indenture as
     described below under the caption "--Payment and Paying Agents," the
     principal of and premium, if any, and interest, if any, on the debt
     securities will be payable and where, subject to the terms of the
     indenture as described below under the caption "--Denominations,
     Registration and Transfer," Adelphia will maintain an office or agency
     where debt securities may be presented for registration of transfer or
     exchange and the place or places where notices and demands to or upon
     Adelphia in respect of the debt securities and the indenture may be
     made;

  .  any period or periods within, or date or dates on which, the price or
     prices at which and the terms and conditions upon which debt securities
     may be redeemed, in whole or in part, at the option of Adelphia pursuant
     to any sinking fund or otherwise;

  .  the obligation, if any, of Adelphia to redeem or purchase the debt
     securities pursuant to any sinking fund or analogous provisions or at
     the option of a holder and the period or periods within which, the price
     or prices at which, the currency or currencies including currency unit
     or units, in which and the other terms and conditions upon which the
     debt securities will be redeemed or purchased, in whole or in part,
     pursuant to such obligation;

  .  the denominations in which any debt securities will be issuable if other
     than denominations of $1,000 and any integral multiple thereof;

  .  if other than in U.S. Dollars, the currency or currencies, including
     currency unit or units, in which the principal of, and premium, if any,
     and interest, if any, on the debt securities will be payable, or in
     which the debt securities shall be denominated;

  .  any additions, modifications or deletions in the events of default or
     covenants of Adelphia specified in the indenture with respect to the
     debt securities;

  .  if other than the principal amount, the portion of the principal amount
     of debt securities that will be payable upon declaration of acceleration
     of the maturity thereof;

  .  any additions or changes to the indenture with respect to a series of
     debt securities that will be necessary to permit or facilitate the
     issuance of the series in bearer form, registrable or not registrable as
     to principal, and with or without interest coupons;

                                       19
<PAGE>

  .  any index or indices used to determine the amount of payments of
     principal of and premium, if any, on the debt securities and the manner
     in which such amounts will be determined;

  .  subject to the terms described under "--Global Debt Securities," whether
     the debt securities of the series will be issued in whole or in part in
     the form of one or more global securities and, in such case, the
     depositary for the global securities;

  .  the appointment of any trustee, registrar, paying agent or agents;

  .  the terms and conditions of any obligation or right of Adelphia or a
     holder to convert or exchange debt securities into preferred securities
     or other securities;

  .  whether the defeasance and covenant defeasance provisions described
     under the caption "--Satisfaction and Discharge; Defeasance" will be
     inapplicable or modified;

  .  any applicable subordination provisions in addition to those set forth
     herein with respect to subordinated debt securities; and

  .  any other terms of the debt securities not inconsistent with the
     provisions of the applicable indenture.

   We may sell debt securities at a substantial discount below their stated
principal amount, bearing no interest or interest at a rate which at the time
of issuance is below market rates. We will describe material U.S. federal
income tax consequences and special considerations applicable to the debt
securities in the applicable prospectus supplement.

   If the purchase price of any of the debt securities is payable in one or
more foreign currencies or currency units or if any debt securities are
denominated in one or more foreign currencies or currency units or if the
principal of, premium, if any, or interest, if any, on any debt securities is
payable in one or more foreign currencies or currency units, we will set forth
the restrictions, elections, material U.S. federal income tax considerations,
specific terms and other information with respect to such issue of debt
securities and such foreign currency or currency units in the applicable
prospectus supplement.

   If any index is used to determine the amount of payments of principal,
premium, if any, or interest on any series of debt securities, we will describe
the material U.S. federal income tax, accounting and other considerations
applicable thereto in the applicable prospectus supplement.

Denominations, Registration and Transfer

   Unless otherwise specified in the applicable prospectus supplement, the debt
securities will be issuable only in registered form, without coupons, in
denominations of $1,000 and any integral multiple thereof. Debt securities of
any series will be exchangeable for other debt securities of the same issue and
series, of any authorized denominations of a like

                                       20
<PAGE>

aggregate principal amount, the same original issue date, stated maturity and
bearing the same interest rate.

   Holders may present each series of debt securities for exchange as provided
above, and for registration of transfer, with the form of transfer endorsed
thereon, or with a satisfactory written instrument of transfer, duly executed,
at the office of the appropriate securities registrar or at the office of any
transfer agent designated by Adelphia for such purpose and referred to in the
applicable prospectus supplement, without service charge and upon payment of
any taxes and other governmental charges as described in the indenture.
Adelphia will appoint the trustee of each series of debt securities as
securities registrar for such series under the indenture. If the applicable
prospectus supplement refers to any transfer agents, in addition to the
securities registrar initially designated by Adelphia with respect to any
series, Adelphia may at any time rescind the designation of any such transfer
agent or approve a change in the location through which any such transfer agent
acts, provided that Adelphia maintains a transfer agent in each place of
payment for the series. Adelphia may at any time designate additional transfer
agents with respect to any series of debt securities.

   In the event of any redemption, neither Adelphia nor the trustee will be
required to:

  .  issue, register the transfer of or exchange debt securities of any
     series during a period beginning at the opening of business 15 days
     before the day of mailing of a notice for redemption of debt securities
     of that series, and ending at the close of business on the day of
     mailing of the relevant notice of redemption, or

  .  transfer or exchange any debt securities so selected for redemption,
     except, in the case of any debt securities being redeemed in part, any
     portion not being redeemed.

Global Debt Securities

   Unless otherwise specified in the applicable prospectus supplement, the debt
securities of a series may be issued in whole or in part in the form of one or
more global securities that we will deposit with, or on behalf of, a depositary
identified in the prospectus supplement relating to such series. Global debt
securities may be issued only in fully registered form and in either temporary
or permanent form. Unless and until it is exchanged in whole or in part for the
individual debt securities represented by it, a global debt security may not be
transferred except as a whole by the depositary for the global debt security to
a nominee of the depositary or by a nominee of the depositary to the depositary
or another nominee of the depositary or by the depositary or any nominee to a
successor depositary or any nominee of the successor.

   The specific terms of the depositary arrangement with respect to a series of
debt securities will be described in the prospectus supplement relating to the
series. Adelphia anticipates that the following provisions will generally apply
to depositary arrangements.

   Upon the issuance of a global debt security, and the deposit of the global
debt security with or on behalf of the applicable depositary, the depositary
for the global debt security or

                                       21
<PAGE>

its nominee will credit on its book-entry registration and transfer system, the
respective principal amounts of the individual debt securities represented by
the global debt security to the accounts of persons, more commonly known as
participants, that have accounts with the depositary. These accounts will be
designated by the dealers, underwriters or agents with respect to the debt
securities or by Adelphia if the debt securities are offered and sold directly
by Adelphia. Ownership of beneficial interests in a global debt security will
be limited to participants or persons that may hold interests through
participants. Ownership of beneficial interests in the global debt security
will be shown on, and the transfer of that ownership will be effected only
through, records maintained by the applicable depositary or its nominee with
respect to interests of participants and the records of participants with
respect to interests of persons who hold through participants. The laws of some
states require that certain purchasers of securities take physical delivery of
the securities in definitive form. These limits and laws may impair the ability
to transfer beneficial interests in a global debt security.

   So long as the depositary for a global debt security, or its nominee, is the
registered owner of the global debt security, the depositary or its nominee, as
the case may be, will be considered the sole owner or holder of the debt
securities represented by the global debt security for all purposes under the
indenture. Except as provided below, owners of beneficial interests in a global
debt security will not be entitled to have any of the individual debt
securities of the series represented by the global debt security registered in
their names, will not receive or be entitled to receive physical delivery of
any debt securities of the series in definitive form and will not be considered
the owners or holders of them under the indenture.

   Payments of principal of, and premium, if any, and interest on individual
debt securities represented by a global debt security registered in the name of
a depositary or its nominee will be made to the depositary or its nominee, as
the case may be, as the registered owner of the global debt security
representing the debt securities. None of Adelphia, or the trustee, any paying
agent, or the securities registrar for the debt securities will have any
responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interest of the global debt
security for the debt securities or for maintaining, supervising or reviewing
any records relating to those beneficial ownership interests.

   Adelphia expects that the depositary for a series of debt securities or its
nominee, upon receipt of any payment of principal, premium or interest in
respect of a permanent global debt security representing any of the debt
securities, immediately will credit participants' accounts with payments in
amounts proportionate to their respective beneficial interest in the principal
amount of the global debt security for the debt securities as shown on the
records of the depositary or its nominee. Adelphia also expects that payments
by participants to owners of beneficial interests in the global debt security
held through the participants will be governed by standing instructions and
customary practices, as is now the case with securities held for the accounts
of customers in bearer form or registered in "street name." These payments will
be the responsibility of these participants.

                                       22
<PAGE>

   Unless otherwise specified in the applicable prospectus supplement, if the
depositary for a series of debt securities is at any time unwilling, unable or
ineligible to continue as depositary and a successor depositary is not
appointed by Adelphia within 90 days, Adelphia will issue individual debt
securities of the series in exchange for the global debt security representing
the series of debt securities. In addition, unless otherwise specified in the
applicable prospectus supplement, Adelphia may at any time and in its sole
discretion, subject to any limitations described in the prospectus supplement
relating to the debt securities, determine not to have any debt securities of
the series represented by one or more global debt securities and, in such
event, will issue individual debt securities of the series in exchange for such
global debt securities. Further, if Adelphia so specifies with respect to the
debt securities of a series, an owner of a beneficial interest in a global debt
security representing debt securities of the series may, on terms acceptable to
Adelphia, the trustee and the depositary for the global debt security, receive
individual debt securities of the series in exchange for such beneficial
interests, subject to any limitations described in the prospectus supplement
relating to the debt securities. In any such instance, an owner of a beneficial
interest in a global debt security will be entitled to physical delivery of
individual debt securities of the series represented by the global debt
security equal in principal amount to its beneficial interest and to have the
debt securities registered in its name. Individual debt securities of the
series so issued will be issued in denominations, unless otherwise specified by
Adelphia, of $1,000 and integral multiples thereof. The applicable prospectus
supplement may specify other circumstances under which individual debt
securities may be issued in exchange for the global debt security representing
any debt securities.

Payment and Paying Agents

   Unless otherwise indicated in the applicable prospectus supplement, payment
of principal of, and premium, if any, and any interest on debt securities will
be made at the office of the trustee in New York or at the office of such
paying agent or paying agents as Adelphia may designate from time to time in
the applicable prospectus supplement, except that at the option of Adelphia
payment of any interest may be made:

  .  except in the case of global debt securities, by check mailed to the
     address of the person or entity entitled thereto as such address shall
     appear in the securities register; or

  .  by transfer to an account maintained by the person or entity entitled
     thereto as specified in the securities register, provided that proper
     transfer instructions have been received by the regular record date.
     Unless otherwise indicated in the applicable prospectus supplement, we
     will make payment of any interest on debt securities to the person or
     entity in whose name the debt security is registered at the close of
     business on the regular record date for the interest payment, except in
     the case of defaulted interest. Adelphia may at any time designate
     additional paying agents or rescind the designation of any paying agent;
     however, Adelphia will at all times be required to maintain a paying
     agent in each place of payment for each series of debt securities.

                                       23
<PAGE>

   Any moneys deposited with the trustee or any paying agent, or held by
Adelphia in trust, for the payment of the principal of, and premium, if any, or
interest on any debt security and remaining unclaimed for two years after such
principal, and premium, if any, or interest has become due and payable will, at
the request of Adelphia, be repaid to Adelphia or released from such trust, as
applicable, and the holder of the debt security will thereafter look, as a
general unsecured creditor, only to Adelphia for payment.

Option to Defer Interest Payments or to Pay-in-Kind

   If provided in the applicable prospectus supplement, Adelphia will have the
right, at any time and from time to time during the term of any series of debt
securities, to defer the payment of interest for such number of consecutive
interest payment periods as may be specified in the applicable prospectus
supplement, subject to the terms, conditions and covenants, if any, specified
in such prospectus supplement, provided that an extension period may not extend
beyond the stated maturity of the final installment of principal of the series
of debt securities. If provided in the applicable prospectus supplement,
Adelphia will have the right, at any time and from time to time during the term
of any series of debt securities, to make payments of interest by delivering
additional debt securities of the same series. Certain material U.S. federal
income tax consequences and special considerations applicable to the debt
securities will be described in the applicable prospectus supplement.

Subordination

   Except as set forth in the applicable prospectus supplement, the
subordinated indenture provides that the subordinated debt securities are
subordinated and junior in right of payment to all senior indebtedness of
Adelphia. If:

  .  Adelphia defaults in the payment of any principal, or premium, if any,
     or interest on any senior indebtedness when the same becomes due and
     payable, whether at maturity or at a date fixed for prepayment or
     declaration or otherwise; or

  .  an event of default occurs with respect to any senior indebtedness
     permitting the holders thereof to accelerate the maturity thereof and
     written notice of such event of default, requesting that payments on
     subordinated debt securities cease, is given to Adelphia by the holders
     of senior indebtedness,

   then unless and until the default in payment or event of default shall have
been cured or waived or shall have ceased to exist, no direct or indirect
payment, in cash, property or securities, by set-off or otherwise, will be made
or agreed to be made on account of the subordinated debt securities or interest
thereon or in respect of any repayment, redemption, retirement, purchase or
other acquisition of subordinated debt securities.

   Except as set forth in the applicable prospectus supplement, the
subordinated indenture provides that in the event of:

  .  any insolvency, bankruptcy, receivership, liquidation, reorganization,
     readjustment, composition or other similar proceeding relating to
     Adelphia, its creditors or its property;

                                       24
<PAGE>

  .  any proceeding for the liquidation, dissolution or other winding-up of
     Adelphia, voluntary or involuntary, whether or not involving insolvency
     or bankruptcy proceedings;

  .  any assignment by Adelphia for the benefit of creditors; or

  .  any other marshaling of the assets of Adelphia;

all present and future senior indebtedness, including, without limitation,
interest accruing after the commencement of the proceeding, assignment or
marshaling of assets, will first be paid in full before any payment or
distribution, whether in cash, securities or other property, will be made by
Adelphia on account of subordinated debt securities. In that event, any
payment or distribution, whether in cash, securities or other property, other
than securities of Adelphia or any other corporation provided for by a plan of
reorganization or a readjustment, the payment of which is subordinate, at
least to the extent provided in the subordination provisions of the indenture,
to the payment of all senior indebtedness at the time outstanding and to any
securities issued in respect thereof under any such plan of reorganization or
readjustment and other than payments made from any trust described in the
"Satisfaction and Discharge; Defeasance" below, which would otherwise but for
the subordination provisions be payable or deliverable in respect of
subordinated debt securities, including any such payment or distribution which
may be payable or deliverable by reason of the payment of any other
indebtedness of Adelphia being subordinated to the payment of subordinated
debt securities will be paid or delivered directly to the holders of senior
indebtedness, or to their representative or trustee, in accordance with the
priorities then existing among such holders until all senior indebtedness
shall have been paid in full. No present or future holder of any senior
indebtedness will be prejudiced in the right to enforce subordination of the
indebtedness evidenced by subordinated debt securities by any act or failure
to act on the part of Adelphia.

   The term "senior indebtedness" is defined as the principal, premium, if
any, and interest on:

  .  all indebtedness of Adelphia, whether outstanding on the date of the
     issuance of subordinated debt securities or thereafter created, incurred
     or assumed, which is for money borrowed, or which is evidenced by a note
     or similar instrument given in connection with the acquisition of any
     business, properties or assets, including securities;

  .  any indebtedness of others of the kinds described in the first bullet
     point above for the payment of which Adelphia is responsible or liable
     as guarantor or otherwise; and

  .  amendments, renewals, extensions and refundings of any such
     indebtedness;

unless in any instrument or instruments evidencing or securing such
indebtedness or pursuant to which the same is outstanding, or in any such
amendment, renewal, extension or refunding, it is expressly provided that such
indebtedness is not superior in right of payment to subordinated debt
securities. The senior indebtedness will continue to be senior

                                      25
<PAGE>

indebtedness and entitled to the benefits of the subordination provisions
irrespective of any amendment, modification or waiver of any term of the senior
indebtedness or extension or renewal of the senior indebtedness.

   Except as provided in the applicable prospectus supplement, the subordinated
indenture for a series of subordinated debt does not limit the aggregate amount
of senior indebtedness that may be issued by Adelphia. As of December 31, 1998,
senior indebtedness of the Adelphia Parent Company aggregated approximately
$1,810,212,000. In addition, because Adelphia is a holding company, the
subordinated debt securities are effectively subordinated to all existing and
future liabilities of Adelphia's subsidiaries.

Modification of Indentures

   From time to time, Adelphia and the trustees may modify the indentures
without the consent of any holders of any series of debt securities with
respect to some matters, including:

  .  to cure any ambiguity, defect or inconsistency or to correct or
     supplement any provision which may be inconsistent with any other
     provision of the indenture;

  .  to qualify, or maintain the qualification of, the indentures under the
     Trust Indenture Act; and

  .  to make any change that does not materially adversely affect the
     interests of any holder of such series of debt securities.

   In addition, under the indentures, Adelphia and the trustee may modify some
rights, covenants and obligations of Adelphia and the rights of holders of any
series of debt securities with the written consent of the holders of at least a
majority in aggregate principal amount of the series of outstanding debt
securities; but no extension of the maturity of any series of debt securities,
reduction in the interest rate or extension of the time for payment of
interest, change in the optional redemption or repurchase provisions in a
manner adverse to any holder of the series of debt securities, other
modification in the terms of payment of the principal of, or interest on, the
series of debt securities, or reduction of the percentage required for
modification, will be effective against any holder of the series of outstanding
debt securities without the holder's consent.

   In addition, Adelphia and the trustees may execute, without the consent of
any holder of the debt securities, any supplemental indenture for the purpose
of creating any new series of debt securities.

Events of Default

   The indentures provide that any one or more of the following described
events with respect to a series of debt securities that has occurred and is
continuing constitutes an "event of default" with respect to that series of
debt securities:

                                       26
<PAGE>

  .  failure for 60 days to pay any interest or any sinking fund payment on
     the series of debt securities when due, (subject to the deferral of any
     due date in the case of an extension period);

  .  failure to pay any principal or premium, if any, on the series of the
     debt securities when due whether at maturity, upon redemption, by
     declaration or otherwise;

  .  failure to observe or perform in any material respect certain other
     covenants contained in the indenture for 90 days after written notice
     has been given to Adelphia from the trustee or the holders of at least
     25% in principal amount of the series of outstanding debt securities;

  .  default resulting in acceleration of other indebtedness of Adelphia for
     borrowed money where the aggregate principal amount so accelerated
     exceeds $25 million and the acceleration is not rescinded or annulled
     within 30 days after the written notice thereof to Adelphia by the
     trustee or to Adelphia and the trustee by the holders of 25% in
     aggregate principal amount of the debt securities of the series then
     outstanding, provided that the event of default will be remedied, cured
     or waived if the default that resulted in the acceleration of such other
     indebtedness is remedied, cured or waived; or

  .  certain events in bankruptcy, insolvency or reorganization of Adelphia.

   The holders of a majority in outstanding principal amount of the series of
debt securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the trustee of the
series. The trustee or the holders of not less than 25% in aggregate
outstanding principal amount of the series may declare the principal due and
payable immediately upon an event of default. The holders of a majority in
aggregate outstanding principal amount of the series may annul the declaration
and waive the default if the default (other than the non-payment of the
principal of the series which has become due solely by the acceleration) has
been cured and a sum sufficient to pay all matured installments of interest and
principal due otherwise than by acceleration has been deposited with the
trustee of the series.

   The holders of a majority in outstanding principal amount of a series of
debt securities affected thereby may, on behalf of the holders of all the
holders of the series of debt securities, waive any past default, except a
default in the payment of principal or interest, unless the default has been
cured and a sum sufficient to pay all matured installments of interest and
principal due otherwise than by acceleration has been deposited with the
trustee of the series, or a default in respect of a covenant or provision which
under the related indenture cannot be modified or amended without the consent
of the holder of each outstanding debt security of the series. Adelphia is
required to file annually with the trustees a certificate as to whether or not
Adelphia is in compliance with all the conditions and covenants applicable to
it under the indentures.

   In case an event of default shall occur and be continuing as to a series of
debt securities, the trustee of the series will have the right to declare the
principal of and the interest on the

                                       27
<PAGE>

debt securities, and any other amounts payable under the indenture, to be
forthwith due and payable and to enforce its other rights as a creditor with
respect to the debt securities.

   No holder of any debt securities will have any right to institute any
proceeding with respect to the indenture or for any remedy thereunder, unless
the holder shall have previously given to the trustee written notice of a
continuing event of default and unless also the holders of at least 25% in
aggregate principal amount of the outstanding debt securities of the series
shall have made written request and offered reasonably indemnity to the trustee
of the series to institute the proceeding as a trustee, and unless the trustee
shall not have received from the holders of a majority in aggregate principal
amount of the outstanding debt securities of the class a direction inconsistent
with the request and shall have failed to institute the proceeding within 60
days. However, these limitations do not apply to a suit instituted by a holder
of a debt security for enforcement of payment of the principal or interest on
the debt security on or after the respective due dates expressed in the debt
security.

Consolidation, Merger, Sale of Assets and Other Transactions

   Unless otherwise indicated in the applicable prospectus supplement, the
indentures provide that Adelphia will not consolidate with or merge into any
other person or entity or sell, assign, convey, transfer or lease its
properties and assets substantially as an entirety to any person or entity
unless:

  .  either Adelphia is the continuing corporation, or any successor or
     purchaser is a corporation, partnership, or trust or other entity
     organized under the laws of the United States of America, any State
     thereof or the District of Columbia, and the successor or purchaser
     expressly assumes Adelphia's obligations on the debt securities under a
     supplemental indenture; and

  .  immediately before and after giving effect thereto, no event of default,
     and no event which, after notice or lapse of time or both, would become
     an event of default, shall have happened and be continuing.

   Unless otherwise indicated in the applicable prospectus supplement, the
general provisions of the indentures do not afford holders of the debt
securities protection in the event of a highly leveraged or other transaction
involving Adelphia that may adversely affect holders of the debt securities.

Satisfaction and Discharge; Defeasance

   The indentures provide that when, among other things, all debt securities
not previously delivered to the trustee for cancellation:

  .  have become due and payable, or

  .  will become due and payable at their stated maturity within one year,

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<PAGE>

and Adelphia deposits or causes to be deposited with the trustee, as trust
funds in trust for the purpose, an amount in the currency or currencies in
which the debt securities are payable sufficient to pay and discharge the
entire indebtedness on the debt securities not previously delivered to the
trustee for cancellation, for the principal, and premium, if any, and interest
to the date of the deposit or to the stated maturity, as the case may be, then
the indenture will cease to be of further effect (except as to Adelphia's
obligations to pay all other sums due pursuant to the indenture and to provide
the officers' certificates and opinions of counsel described therein), and
Adelphia will be deemed to have satisfied and discharged the indenture.

   The indentures provide that Adelphia may elect either:

  .  to terminate, and be deemed to have satisfied, all its obligations with
     respect to any series of debt securities, except for the obligations to
     register the transfer or exchange of such debt securities, to replace
     mutilated, destroyed, lost or stolen debt securities, to maintain an
     office or agency in respect of the debt securities and to compensate and
     indemnify the trustee ("defeasance"); or

  .  to be released from its obligations with respect to certain covenants,
     ("covenant defeasance") upon the deposit with the trustee, in trust for
     such purpose, of money and/or U.S. Government Obligations, as defined in
     the indenture, which through the payment of principal and interest in
     accordance with the term used will provide money, in an amount
     sufficient (in the opinion of a nationally recognized firm of
     independent public accountants) to pay the principal of, interest on and
     any other amounts payable in respect of the outstanding debt securities
     of the series.

   Such a trust may be established only if, among other things, Adelphia has
delivered to the trustee an opinion of counsel (as specified in the indenture)
with regard to certain matters, including an opinion to the effect that the
holders of the debt securities will not recognize income, gain or loss for
Federal income tax purposes as a result of the deposit and discharge and will
be subject to Federal income tax on the same amounts and in the same manner and
at the same times as would have been the case if the deposit and defeasance or
covenant defeasance, as the case may be, had not occurred.

Redemption

   Unless otherwise indicated in the applicable prospectus supplement, debt
securities will not be subject to any sinking fund requirements.

   Unless otherwise indicated in the applicable prospectus supplement, Adelphia
may, at its option, redeem the debt securities of any series in whole at any
time or in part from time to time, at the redemption price set forth in the
applicable prospectus supplement plus accrued and unpaid interest to the date
fixed for redemption, and debt securities in denominations larger than $1,000
may be redeemed in part but only in integral multiples of $1,000. If the debt
securities of any series are so redeemable only on or after a specified date or
upon the satisfaction of additional conditions, the applicable prospectus
supplement will specify the date or describe the conditions.

                                       29
<PAGE>

   Adelphia will mail notice of any redemption at least 30 days but not more
than 60 days before the redemption date to each holder of debt securities to be
redeemed at the holder's registered address. Unless Adelphia defaults in the
payment of the redemption price, on and after the redemption date interest
shall cease to accrue on the debt securities or portions thereof called for
redemption.

Conversion or Exchange

   If and to the extent indicated in the applicable prospectus supplement, the
debt securities of any series may be convertible or exchangeable into other
securities. The specific terms on which debt securities of any series may be so
converted or exchanged will be set forth in the applicable prospectus
supplement. These terms may include provisions for conversion or exchange,
either mandatory, at the option of the holder, or at the option of Adelphia, in
which case the number of shares of other securities to be received by the
holders of debt securities would be calculated as of a time and in the manner
stated in the applicable prospectus supplement.

Certain Covenants

   The indentures contain certain covenants regarding, among other matters,
corporate existence, payment of taxes and reports to holders of debt
securities. If and to the extent indicated in the applicable prospectus
supplement, these covenants may be removed or additional covenants added with
respect to any series of debt securities.

Governing Law

   The indentures and the debt securities will be governed by and construed in
accordance with the laws of the State of New York.

Information Concerning the Trustees

   Each trustee shall have and be subject to all the duties and
responsibilities specified with respect to an indenture trustee under the Trust
Indenture Act. Subject to these provisions, each trustee is under no obligation
to exercise any of the powers vested in it by the indenture at the request of
any holder of the debt securities, unless offered reasonable indemnity by the
holder against the costs, expenses and liabilities which might be incurred
thereby. Each trustee is not required to expend or risk its own funds or
otherwise incur personal financial liability in the performance of its duties
if the trustee reasonably believes that repayment or adequate indemnity is not
reasonably assured to it.

                                       30
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

   The following description of the capital stock of Adelphia and certain
provisions of Adelphia's Certificate of Incorporation and Bylaws as of April
18, 1999 is a summary and is qualified in its entirety by Adelphia's
Certificate of Incorporation and Bylaws, which documents are exhibits to the
registration statement covering this prospectus.

   Adelphia's authorized capital stock consists of 200,000,000 shares of Class
A common stock, 25,000,000 shares of Class B common stock, and 5,000,000 shares
of preferred stock.

Common Stock

   Dividends. Holders of Class A common stock and Class B common stock are
entitled to receive such dividends as may be declared by Adelphia's Board of
Directors out of funds legally available for this purpose, but only after
payment of dividends required to be paid on outstanding shares of any other
class or series of stock having preference over common stock as to dividends.
No dividend may be declared or paid in cash or property on either class of
common stock, however, unless simultaneously a dividend is paid on the other
class of common stock as follows. In the event a cash dividend is paid, the
holders of Class A common stock will be paid a cash dividend per share equal to
105% of the amount payable per share of Class B common stock. In the event of a
property dividend, holders of each class of common stock are entitled to
receive the same value per share of common stock outstanding. In the case of
any stock dividend, holders of Class A common stock are entitled to receive the
same percentage dividend (payable in Class A common stock) as the holders of
Class B common stock receive (payable in Class B common stock).

   Voting Rights. Holders of Class A common stock and Class B common stock vote
as a single class on all matters submitted to a vote of the stockholders, with
each share of Class A common stock entitled to one vote and each share of Class
B common stock entitled to ten votes, except:

  .  for the election of directors, and

  .  as otherwise provided by law.

   In the annual election of directors, the holders of Class A common stock,
voting as a separate class, are entitled to elect one of Adelphia's directors.
The holders of Class A common stock and Class B common stock, voting as a
single class with each share of Class A common stock entitled to one vote and
each share of Class B common stock entitled to ten votes, are entitled to elect
the remaining directors. Consequently, holders of Class B common stock have
sufficient voting power to elect the remaining seven members of the current
eight-member board of directors. Holders of Class A common stock and Class B
common stock are not entitled to cumulate votes in the election of directors.
Under Delaware law and Adelphia's Certificate of Incorporation, the affirmative
vote of a majority of the outstanding shares of Class A common stock is
required to approve, among other matters, a change in the powers, preferences
or special rights of the shares of Class A common stock

                                       31
<PAGE>

so as to affect them adversely, but is not required to approve an increase or
decrease in the number of authorized shares of Class A common stock.

   Liquidation Rights. Upon liquidation, dissolution or winding up of Adelphia,
any distributions to holders of any class of common stock would only be made
after payment in full of creditors and provision for the preference of any
other class or series of stock having a preference over the common stock upon
liquidation, dissolution or winding up that may then be outstanding.
Thereafter, the holders of Class A common stock are entitled to a preference of
$1.00 per share. After this amount is paid, holders of the Class B common stock
are entitled to receive $1.00 per share. Any remaining amount would then be
shared ratably by both classes.

   Other Provisions. Each share of Class B common stock is convertible at the
option of its holder into one share of Class A common stock at any time. The
holders of Class A common stock and Class B common stock are not entitled to
preemptive or subscription rights. Neither the Class A common stock nor the
Class B common stock may be subdivided, consolidated, reclassified or otherwise
changed unless concurrently the other class of common stock is subdivided,
consolidated, reclassified or otherwise changed in the same proportion and in
the same manner.

Preferred Stock

   The 5,000,000 shares of authorized preferred stock may be issued with such
designations, powers, preferences and other rights and qualifications,
limitations and restrictions thereof as Adelphia's board of directors may
authorize without further action by Adelphia's stockholders, including but not
limited to:

  .  the distinctive designation of each series and the number of shares that
     will constitute the series;

  .  the voting rights, if any, of shares of the series;

  .  the dividend rate on the shares of the series, any restriction,
     limitation or condition upon the payment of dividends, whether dividends
     will be cumulative and the dates on which dividends are payable;

  .  the prices at which, and the terms and conditions on which, the shares
     of the series may be redeemed, if the shares are redeemable;

  .  the purchase or sinking fund provisions, if any, for the purchase or
     redemption of shares of the series;

  .  any preferential amount payable upon shares of the series in the event
     of the liquidation, dissolution or winding up of Adelphia or the
     distribution of its assets;

  .  the prices or rates of conversion at which, and the terms and conditions
     on which, the shares of such series may be converted into other
     securities, if such shares are

                                       32
<PAGE>

     convertible. Adelphia has designated and has outstanding three classes
     of preferred stock--8 1/8% Series C Convertible preferred stock, 13%
     Cumulative Exchangeable preferred stock and 5 1/2% Series D Convertible
     preferred stock. For ease of reference, we refer to the 8 1/8% Series C
     convertible preferred stock as the 8 1/8% Convertible preferred stock,
     to the 13% Series B Cumulative Exchangeable preferred stock as the
     Exchangeable preferred stock and to the 5 1/2% Series D Convertible
     preferred stock as the 5 1/2% Convertible preferred stock; and

  .  In connection with the foregoing designations, the maximum number of
     shares authorized of 8 1/8% Convertible preferred stock, Exchangeable
     preferred stock and 5 1/2% Convertible preferred stock is 100,000
     shares, 1,500,000 shares and 2,875,000 shares, respectively. The 8 1/8%
     Convertible preferred stock, Exchangeable preferred stock and 5 1/2%
     Convertible preferred stock rank senior to the common stock of Adelphia
     with respect to dividends and liquidation. The 8 1/8% Convertible
     preferred stock, Exchangeable preferred stock and 5 1/2% Convertible
     preferred stock rank equal in right of payment as to dividends and upon
     liquidation, dissolution or winding-up of Adelphia, except that no cash
     dividends nor any distributions may be declared or paid on, nor any
     redemptions made with respect to the Exchangeable preferred stock or the
     5 1/2% Convertible preferred stock unless full cumulative dividends have
     been paid on all outstanding shares of 8 1/8% Convertible preferred
     stock for all prior dividend periods.

   8 1/8% Convertible Preferred Stock. The 8 1/8% Convertible preferred stock
accrues cumulative dividends at the rate of 8 1/8% per annum, or $81.25 per
share of the 8 1/8% Convertible preferred stock per annum. The 8 1/8%
Convertible preferred stock has a liquidation preference of $1,000 per share.
Upon any voluntary or involuntary liquidation, dissolution or winding-up of
the affairs of Adelphia, the holders of the 8 1/8% Convertible preferred stock
are entitled to receive the liquidation preference for the 8 1/8% Convertible
preferred stock, plus any accrued but unpaid dividends thereon, and no more.
Neither the voluntary sale, conveyance, exchange or transfer, for cash, shares
of stock, securities or other consideration, of all or substantially all of
the property or assets of Adelphia nor the consolidation or merger of Adelphia
with or into one or more corporations will be deemed to be a voluntary or
involuntary liquidation, dissolution or winding-up of Adelphia, unless the
sale, conveyance, exchange or transfer shall be in connection with a
liquidation, dissolution or winding-up of the business of Adelphia.

   Each share of 8 1/8% Convertible preferred stock is convertible based upon
its stated liquidation preference into shares of Class A common stock of
Adelphia at any time at the election of the holder of it at a conversion price
of $8.48 per share of Adelphia Class A common stock, or approximately 117.9245
shares of Class A common stock per share of 8 1/8% Convertible preferred
stock. The conversion price is subject to adjustment if Adelphia pays a
dividend in shares of Class A common stock or subdivides, combines or
reclassifies the shares of Class A common stock or distributes rights to
purchase common stock or makes certain other distributions to holders of
common stock. The 8 1/8% Convertible preferred stock is not entitled to vote
in the election of directors of Adelphia or upon any

                                      33
<PAGE>

other matter, except as provided by law, unless a Voting Rights Triggering
Event, as defined in the related Certificate of Designation, occurs with
respect to the 8 1/8% Convertible preferred stock. If this occurs, the board of
directors will be expanded by two seats, the directors for which shall then be
elected by the holders of the 8 1/8% Convertible preferred stock. The 8 1/8%
Convertible preferred stock is not subject to mandatory redemption.

   The 8 1/8% Convertible preferred stock may be redeemed at the option of
Adelphia, in whole or in part, at any time on or after August 1, 2000 at 104%,
102% and 100% of the liquidation preference of the 8 1/8% Convertible preferred
stock plus accrued dividends in the years beginning August 1, 2000, 2001 and
2002 and thereafter, respectively.

   Exchangeable Preferred Stock. The shares of Exchangeable preferred stock are
redeemable at the option of Adelphia, on or after July 15, 2002. Adelphia is
required, subject to certain conditions, to redeem all of the Exchangeable
preferred stock outstanding on July 15, 2009, at a redemption price equal to
100% of the liquidation preference thereof, plus accumulated and unpaid
dividends to the date of redemption. Dividends on the Exchangeable preferred
stock accrue at a rate of 13% of the liquidation preference per annum and are
payable semiannually. The Exchangeable preferred stock is not entitled to vote
in the election of directors of Adelphia or upon any other matter, except as
provided by law, unless a Voting Rights Triggering Event, as defined in the
related Certificate of Designation, occurs with respect to the Exchangeable
preferred stock. If this occurs, the board of directors will be expanded by two
seats, the directors for which shall then be elected by the holders of the
Exchangeable preferred stock.

   5 1/2% Convertible Preferred Stock. The 5 1/2% Convertible preferred stock
accrues cumulative dividends at the rate of 5 1/2% per annum, or $11.00 per
share of the 5 1/2% Convertible preferred stock per annum. The 5 1/2%
Convertible preferred stock has a liquidation preference of $200 per share.
Upon any voluntary or involuntary liquidation, dissolution or winding-up of the
affairs of Adelphia, the holders of the 5 1/2% Convertible preferred stock are
entitled to receive the liquidation preference for the 5 1/2% Convertible
preferred stock, plus any accrued but unpaid dividends thereon, and no more.
Neither the voluntary sale, conveyance, exchange or transfer, for cash, shares
of stock, securities or other consideration, of all or substantially all of the
property or assets of Adelphia nor the consolidation or merger of Adelphia with
or into one or more corporations will be deemed to be a voluntary or
involuntary liquidation, dissolution or winding-up of Adelphia, unless the
sale, conveyance, exchange or transfer shall be in connection with a
liquidation, dissolution or winding-up of the business of Adelphia.

   Each share of 5 1/2% Convertible preferred stock is convertible based upon
its stated liquidation preference into shares of Class A common stock of
Adelphia at any time at the election of the holder of it at a conversion price
of $81.45 per share of Adelphia Class A common stock, or approximately 2.45549
shares of Class A common stock per share of 5 1/2% Convertible preferred stock.
The conversion price is subject to adjustment in certain circumstances, such as
if Adelphia pays a dividend in shares of Class A common stock or subdivides,
combines or reclassifies the shares of Class A common stock or distributes
rights to purchase common stock or makes certain other distributions to holders
of Class A

                                       34
<PAGE>

common stock. The 5 1/2% Convertible preferred stock is not entitled to vote in
the election of directors of Adelphia or upon any other matter, except as
provided by law, unless dividends are in arrears in an amount equal to at least
six quarters. If this occurs, the board of directors will be expanded by two
seats, the directors for which shall then be elected by the holders of the
5 1/2% Convertible preferred stock and serve until the arrearage is eliminated.
The 5 1/2% Convertible preferred stock is not subject to mandatory redemption.

   The 5 1/2% Convertible preferred stock may be redeemed at the option of
Adelphia, in whole or in part, at any time on or after May 1, 2002, at the
option of Adelphia in shares of Class A common stock at a redemption price of
$206 per share plus accrued and unpaid dividends, if any, to the redemption
date, or for cash at a redemption price of $200 per share plus accrued and
unpaid dividends.

   The rights of holders of shares of common stock as described above will be
subject to, and may be adversely affected by, the rights of holders of any
additional classes of preferred stock that may be designated and issued in the
future.

   We will describe the particular terms and conditions of a series of
preferred stock offered by a prospectus supplement in the prospectus supplement
relating to such series of preferred stock. The applicable prospectus
supplement or prospectus supplements will describe the following terms of each
series of preferred stock being offered:

  .  its title;

  .  the number of shares offered, any liquidation preference per share and
     the purchase price;

  .  any applicable dividend rate(s), period(s) and/or payment date(s) or
     method(s) of calculation;

  .  if dividends apply whether they shall be cumulative or non-cumulative
     and, if cumulative, the date from which dividends shall accumulate;

  .  any procedures for any auction and remarketing;

  .  any provisions for a sinking fund;

  .  any provisions for redemption;

  .  any listing of such preferred stock on any securities exchange or
     market;

  .  the terms and conditions, if applicable, upon which it will be
     convertible into common stock or another series of preferred stock of
     Adelphia, including the conversion price (or manner of calculation
     thereof) and conversion period;

  .  the terms and conditions, if applicable, upon which it will be
     exchangeable into debt securities of Adelphia, including the exchange
     price (or manner of calculation thereof) and exchange period;

  .  any voting rights;

                                       35
<PAGE>

  .  a discussion of any applicable material and/or special United States
     federal income tax considerations;

  .  whether interests in that series of preferred stock will be represented
     by depositary shares;

  .  its relative ranking and preferences as to any dividend rights and
     rights upon liquidation, dissolution or winding up of the affairs of
     Adelphia;

  .  any limitations on the future issuance of any class or series of
     preferred stock ranking senior to or on a parity with the series of
     preferred stock being offered as to dividend rights and rights upon
     liquidation, dissolution or winding up of the affairs of Adelphia; and

  .  any other specific terms, preferences, rights, limitations or
     restrictions.

Transfer Agent

   The Transfer Agent and Registrar for the Class A common stock, the
Exchangeable preferred stock and the 5 1/2% Convertible preferred stock is
American Stock Transfer & Trust Company. The Transfer Agent and Registrar for
the Class B common stock is Adelphia.

                              BOOK ENTRY ISSUANCE

   Unless otherwise specified in the applicable prospectus supplement, DTC will
act as depositary for securities issued in the form of global securities. Such
securities will be issued only as fully-registered securities registered in the
name of Cede & Co. (DTC's nominee). One or more fully-registered global
securities will be issued for such securities representing in the aggregate the
total number of such securities, and will be deposited with or on behalf of
DTC.

   DTC is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a "clearing corporation" within the
meaning of the New York Uniform Commercial Code, and a "clearing agency"
registered pursuant to the provisions of Section 17A of the Exchange Act. DTC
holds securities that its participants deposit with DTC. DTC also facilitates
the settlement among its participants of securities transactions, such as
transfers and pledges, in deposited securities through electronic computerized
book-entry changes in participants' accounts, thereby eliminating the need for
physical movement of securities certificates. Direct participants include
securities brokers and dealers, banks, trust companies, clearing corporations
and certain other organizations. DTC is owned by a number of its direct
participants and by the New York Stock Exchange, the American Stock Exchange
and the National Association of Securities Dealers, Inc. Access to the DTC
system is also available to others, known as indirect participants, such as
securities brokers and dealers, banks and trust companies that clear through or
maintain custodial relationships with direct participants, either directly or
indirectly. The rules applicable to DTC and its participants are on file with
the Commission.

                                       36
<PAGE>

   Purchases of securities within the DTC system must be made by or through
direct participants, which will receive a credit for such Securities on DTC's
records. The ownership interest of each actual purchaser of each Security,
commonly referred to as the beneficial owner is in turn to be recorded on the
direct and indirect participants' records. Beneficial owners will not receive
written confirmation from DTC of their purchases, but beneficial owners are
expected to receive written confirmations providing details of the
transactions, as well as periodic statements of their holdings, from the direct
or indirect participants through which the beneficial owners purchased
securities. Transfers of ownership interests in securities issued in the form
of global securities are to be accomplished by entries made on the books of
participants acting on behalf of beneficial owners. Beneficial owners will not
receive certificates representing their ownership interests in such securities,
except in the event that use of the book-entry system for such securities is
discontinued.

   DTC has no knowledge of the actual beneficial owners of the securities
issued in the form of global securities. DTC's records reflect only the
identity of the direct participants to whose accounts such securities are
credited, which may or may not be the beneficial owners. The participants will
remain responsible for keeping account of their holdings on behalf of their
customers.

   Conveyance of notices and other communications by DTC to direct
participants, by direct participants to indirect participants, and by direct
participants and indirect participants to beneficial owners will be governed by
arrangements among them, subject to any statutory or regulatory requirements as
may be in effect from time to time.

   Although voting with respect to securities issued in the form of global
securities is limited to the holders of record of such securities, in those
instances in which a vote is required, neither DTC nor Cede & Co. will itself
consent or vote with respect to such securities. Under its usual procedures,
DTC would mail an omnibus proxy to the issuer of such securities as soon as
possible after the record date. The omnibus proxy assigns Cede & Co.'s
consenting or voting rights to those direct participants to whose accounts such
securities are credited on the record date, identified in a listing attached to
the omnibus proxy.

   Payments in respect of securities issued in the form of global securities
will be made by the issuer of such securities to DTC. DTC's practice is to
credit direct participants' accounts on the relevant payment date in accordance
with their respective holdings shown on DTC's records unless DTC has reason to
believe that it will not receive payments on such payment date. Payments by
participants to beneficial owners will be governed by standing instructions and
customary practices and will be the responsibility of such participant and not
of DTC or Adelphia, subject to any statutory or regulatory requirements as may
be in effect from time to time. Payments to DTC are the responsibility of the
issuer of the applicable securities, disbursement of such payments to direct
participants is the responsibility of DTC, and disbursements of such payments
to the beneficial owners is the responsibility of direct and indirect
participants.

                                       37
<PAGE>

   DTC may discontinue providing its services as depositary with respect to any
securities at any time by giving reasonable notice to the issuer of such
securities. In the event that a successor depositary is not obtained,
individual security certificates representing such securities are required to
be printed and delivered. Adelphia, at its option, may decide to discontinue
use of the system of book-entry transfers through DTC or a successor
depositary.

   The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that Adelphia believe to be accurate, but
Adelphia assumes no responsibility for the accuracy thereof. Adelphia has no
responsibility for the performance by DTC or its Participants of their
respective obligations as described herein or under the rules and procedures
governing their respective operations.

                              PLAN OF DISTRIBUTION

   Any of the securities being offered under this prospectus may be sold in any
one or more of the following ways from time to time:

  .  through agents;

  .  to or through underwriters;

  .  through dealers; and

  .  directly by Adelphia to purchasers.

   The distribution of the securities may be effected from time to time in one
or more transactions at a fixed price or prices, which may be changed, at
market prices prevailing at the time of sale, at prices related to such
prevailing market prices or at negotiated prices. Securities may also be
offered or sold through depository receipts issued by a depository institution.

   Offers to purchase securities may be solicited by agents designated by
Adelphia from time to time. Any agent involved in the offer or sale of the
securities under this prospectus will be named, and any commissions payable by
Adelphia to these agents will be set forth, in a related prospectus supplement.
Unless otherwise indicated in a prospectus supplement, any agent will be acting
on a reasonable best efforts basis for the period of its appointment. Any agent
may be deemed to be an underwriter, as that term is defined in the Securities
Act, of the securities so offered and sold.

   If securities are sold by means of an underwritten offering, Adelphia will
execute an underwriting agreement with an underwriter or underwriters at the
time an agreement for such sale is reached, and the names of the specific
managing underwriter or underwriters, as well as any other underwriters, the
respective amounts underwritten and the terms of the transaction, including
commissions, discounts and any other compensation of the underwriters and
dealers, if any, will be set forth in a related prospectus supplement. That
prospectus supplement and this prospectus will be used by the underwriters to
make resales of the securities. If underwriters are used in the sale of any
securities in connection with this prospectus, those securities will be
acquired by the underwriters for their own account and

                                       38
<PAGE>

may be resold from time to time in one or more transactions, including
negotiated transactions, at fixed public offering prices or at varying prices
determined by the underwriters and Adelphia at the time of sale. Securities may
be offered to the public either through underwriting syndicates represented by
managing underwriters or directly by one or more underwriters. If any
underwriter or underwriters are used in the sale of securities, unless
otherwise indicated in a related prospectus supplement, the underwriting
agreement will provide that the obligations of the underwriters are subject to
some conditions precedent and that the underwriters with respect to a sale of
these securities will be obligated to purchase all such Securities if any are
purchased.

   Adelphia may grant to the underwriters options to purchase additional
securities, to cover over-allotments, if any, at the initial public offering
price, with additional underwriting commissions or discounts, as may be set
forth in a related prospectus supplement. If Adelphia grants any over-allotment
option, the terms of that over-allotment option will be set forth in the
prospectus supplement for these securities.

   If a dealer is utilized in the sale of the securities in respect of which
this prospectus is delivered, Adelphia will sell these securities to the dealer
as principal. The dealer may then resell such securities to the public at
varying prices to be determined by such dealer at the time of resale. Any such
dealer may be deemed to be an underwriter, as such term is defined in the
Securities Act, of the securities so offered and sold. The name of the dealer
and the terms of the transaction will be set forth in the prospectus supplement
relating to those offers and sales.

   Offers to purchase securities may be solicited directly by Adelphia and
those sales may be made by Adelphia directly to institutional investors or
others, who may be deemed to be underwriters within the meaning of the
Securities Act with respect to any resale of those securities. The terms of any
sales of this type will be described in the prospectus supplement.

   Securities may also be offered and sold, if so indicated in the related
prospectus supplement, in connection with a remarketing upon their purchase, in
accordance with a redemption or repayment in connection with their terms, or
otherwise, by one or more firms "remarketing firms," acting as principals for
their own accounts or as agents for Adelphia. Any remarketing firm will be
identified and the terms of its agreement, if any, with Adelphia and its
compensation will be described in a related prospectus supplement. Remarketing
firms may be deemed to be underwriters, as that term is defined in the
Securities Act, in connection with the securities remarketed by them.

   If so indicated in a related prospectus supplement, Adelphia may authorize
agents and underwriters to solicit offers by certain institutions to purchase
securities from Adelphia at the public offering price set forth in a related
prospectus supplement as part of delayed delivery contracts providing for
payment and delivery on the date or dates stated in a related prospectus
supplement. Such delayed delivery contracts will be subject to only those
conditions set forth in a related prospectus supplement. A commission indicated
in a related prospectus supplement will be paid to underwriters and agents
soliciting purchases of securities pursuant to delayed delivery contracts
accepted by Adelphia.

                                       39
<PAGE>

   Agents, underwriters, dealers and remarketing firms may be entitled under
relevant agreements with Adelphia to indemnification by Adelphia against some
liabilities, including liabilities under the Securities Act, or to contribution
with respect to payments which such agents, underwriters, dealers and
remarketing firms may be required to make in respect thereof.

   Each series of securities will be a new issue and, other than the Class A
common stock, which is quoted on the Nasdaq National Market, will have no
established trading market. Unless otherwise specified in a related prospectus
supplement, Adelphia will not be obligated to list any series of securities on
an exchange or otherwise. We cannot assure you that there will be any liquidity
in the trading market for any of the securities.

   Agents, underwriters, dealers and remarketing firms may be customers of,
engage in transactions with, or perform services for, Adelphia and its
subsidiaries in the ordinary course of business.

                      WHERE YOU CAN FIND MORE INFORMATION

   We file annual, quarterly and special reports, as well as proxy statements
and other information with the SEC. You may read and copy any document we file
with the SEC at the SEC's Public Reference Room at 450 Fifth Street, N.W.,
Washington, D.C. 20549 or at its Regional Offices in Chicago, Illinois or New
York, New York. You may obtain further information about the operation of the
Public Reference Room by calling the SEC at 1-800- SEC-0330. Our SEC filings
are also available to the public over the Internet at the SEC's web site at
http://www.sec.gov, which contains reports, proxy statements and other
information regarding registrants like us that file electronically with the
SEC.

   This prospectus is part of a registration statement on Form S-3 filed by us
with the SEC under the Securities Act. As permitted by SEC rules, this
prospectus does not contain all of the information included in the registration
statement and the accompanying exhibits filed with the SEC. You may refer to
the registration statement and its exhibits for more information.

   The SEC allows us to "incorporate by reference" into this prospectus the
information we file with the SEC. This means that we can disclose important
information to you by referring you to those documents. The information
incorporated by reference is considered to be part of this prospectus. If we
subsequently file updating or superseding information in a document that is
incorporated by reference into this prospectus, the subsequent information will
also become part of this prospectus and will supersede the earlier information.

   We are is incorporating by reference the following documents that we have
filed with the SEC:

  .  our Annual Report on Form 10-K for the year ended March 31, 1998, which
     incorporates, in Items 7 and 8 to such Form 10-K, portions of the Form
     10-K for the

                                       40
<PAGE>

     fiscal year ended December 31, 1997 of Olympus Communications, L.P. and
     Olympus Capital Corporation, as amended by Adelphia's Form 10-K/A dated
     July 27, 1998;

  .  our Quarterly Reports on Form 10-Q for the quarters ended June 30, 1998,
     September 30, 1998 and December 31, 1998;

  .  our Current Reports on Form 8-K for the events dated June 29, 1998, July
     2, 1998, August 3, 1998, August 18, 1998, September 10, 1998, November
     9, 1998, November 12, 1998, December 23, 1998, January 11, 1999,
     February 22, 1999, February 23, 1999, March 5, 1999, March 30, 1999,
     March 31, 1999, April 9, 1999, April 19, 1999, April 21, 1999, April 23,
     1999, and April 28, 1999.

  .  our definitive proxy statement dated September 11, 1998 with respect to
     the Annual Meeting of Stockholders held on October 6, 1998; and

  .  the description of our Class A common stock contained in our
     registration statement filed with the SEC under Section 12 of the
     Exchange Act and subsequent amendments and reports filed to update such
     description.

   We are also incorporating by reference into this prospectus all of our
future filings with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the
Exchange Act until this offering has been completed.

   You may obtain a copy of any of our filings which are incorporated by
reference, at no cost, by writing to or telephoning us at the following
address:

                        Adelphia Communications Corporation
                               Main at Water Street
                          Coudersport, Pennsylvania 16915
                           Attention: Investor Relations
                             Telephone: (814) 274-9830

   You should rely only on the information provided in this prospectus or
incorporated by reference. We have not authorized anyone to provide you with
different information. You should not assume that the information in this
prospectus is accurate as of any date other than the date on the first page of
the prospectus. We are not making this offer of securities in any state or
country in which the offer or sale is not permitted.

                                 LEGAL MATTERS

   Buchanan Ingersoll Professional Corporation, Pittsburgh, Pennsylvania will
pass upon the validity of the securities. Any required information regarding
ownership of Adelphia's securities by lawyers of such firm will be contained in
the applicable prospectus supplement. If the securities are underwritten, the
applicable prospectus supplement will also set forth whether and to what
extent, if any, a law firm for the underwriters will pass upon the validity of
the securities.

                                       41
<PAGE>

                                    EXPERTS

   The consolidated financial statements of Adelphia and its subsidiaries as of
March 31, 1997 and 1998, and for each of the three years in the period ended
March 31, 1998, and the consolidated financial statements of Olympus and its
subsidiaries as of December 31, 1996 and 1997, and for each of the three years
in the period ended December 31, 1997, all incorporated in this prospectus by
reference from Adelphia's Annual Report on Form 10-K for the year ended March
31, 1998 have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their reports, which are incorporated herein by reference, and have
been so incorporated in reliance upon the reports of such firm given upon their
authority as experts in accounting and auditing.

   The consolidated financial statements of FrontierVision Partners, L.P. and
subsidiaries as of December 31, 1998 and 1997, and for each of the years in the
three year period ended December 31, 1998, have been incorporated by reference
herein and in this registration statement from Adelphia's Current Report on
Form 8-K filed April 19, 1999, in reliance upon the report of KPMG LLP,
independent certified public accountants, incorporated by reference herein, and
upon the authority of said firm as experts in accounting and auditing.

   The consolidated financial statements of Harron Communications Corp. and
subsidiaries as of December 31, 1998 and 1997 and for each of the three years
in the period ended December 31, 1998 incorporated in this prospectus by
reference from Adelphia's Current Report on Form 8-K filed April 19, 1999 have
been audited by Deloitte & Touche LLP, independent auditors, as stated in their
report, which is incorporated herein by reference, and has been so incorporated
in reliance upon the report of such firm given upon their authority as experts
in accounting and auditing.

   The consolidated financial statements of Century Communications Corp. and
subsidiaries as of May 31, 1998 and 1997 and for each of the three years in the
period ended May 31, 1998 incorporated in this prospectus by reference from
Adelphia's Current Report on Form 8-K filed April 19, 1999 have been audited by
Deloitte & Touche LLP, independent auditors as stated in their report, which is
incorporated herein by reference, and has been so incorporated in reliance upon
the report of such firm given upon their authority as experts in accounting and
auditing.

                                       42
<PAGE>

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                               17,000,000 Shares

                                 ADELPHIA LOGO

                              ------------------

                             Prospectus Supplement

                                January 17, 2001

                              ------------------


Banc of America Securities LLC                              Salomon Smith Barney
                           Credit Suisse First Boston
                              Goldman, Sachs & Co.
                           Morgan Stanley Dean Witter
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