ADELPHIA COMMUNICATIONS CORP
424B5, 1999-04-26
CABLE & OTHER PAY TELEVISION SERVICES
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<PAGE>
 
                                            Filed pursuant to Rule 424b(5)
                                            Registration No. 333-74219
PROSPECTUS SUPPLEMENT
(To Prospectus Dated April 20, 1999)
[LOGO OF ADELPHIA]
                                8,000,000 Shares
                      Adelphia Communications Corporation
 
                              Class A Common Stock
 
                                  ------------
 
   We are selling 8,000,000 shares of our Class A common stock.
 
   Our Class A common stock is quoted on the Nasdaq National Market under the
symbol "ADLAC." The last reported sale price of our Class A common stock on
Nasdaq on April 22, 1999, was $61.25 per share.
 
                                  ------------
 
  Investing in the common stock involves risks. See "Risk Factors" beginning on
page S-6.
 
  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus supplement is truthful or complete. Any representation to the
contrary is a criminal offense.
 
                                  ------------
<TABLE>
<CAPTION>
                                                          Per Share    Total
                                                          --------- ------------
<S>                                                       <C>       <C>
Public Offering Price....................................  $61.75   $494,000,000
Underwriting Discount....................................  $ 0.99     $7,900,000
Proceeds to Adelphia (before expenses)...................  $60.76   $486,100,000
</TABLE>
 
  The underwriters are offering the shares subject to various conditions. The
underwriters expect to deliver the shares to purchasers on or about April 28,
1999.
 
                                  ------------
 
Joint Lead Manager & Sole Book Runner                         Joint Lead Manager
Salomon Smith Barney                                        Goldman, Sachs & Co.
 
Credit Suisse First Boston
                 Donaldson, Lufkin & Jenrette
                                   Merrill Lynch & Co.
                                                Morgan Stanley Dean Witter
 
Credit Lyonnais Securities (USA) Inc.
                               NationsBanc Montgomery Securities LLC
                                                                    SG Cowen
 
April 23, 1999
<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-18
 
Capitalization............................................................. S-19
 
Price Range of Adelphia's Common Equity and Dividend Policy................ S-20
 
Dilution................................................................... S-21
 
Certain United States Tax Consequences to Non-United States Holders........ S-22
 
Underwriting............................................................... S-25
 
Convertible Preferred Stock 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........................................................  35
 
Plan of Distribution.......................................................  37
 
Where You Can Find More Information........................................  39
 
Legal Matters..............................................................  40
 
Experts....................................................................  41
</TABLE>
 
<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 fourth largest cable
television operator in the United States, after giving effect to the recent and
pending acquisitions described in "Recent Developments." Through our subsidiary
Hyperion Telecommunications, Inc., we own and operate a super regional provider
of integrated communications services in the eastern half of the United States.
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 voice, video and data by way of digital
or analog signals. We owned cable television systems with broadband networks
that passed in front of 7,458,803 homes and served 4,815,161 basic subscribers
as of December 31, 1998, after giving effect to the recent and pending
acquisitions described in "Recent Developments." After giving effect to these
acquisitions, the cable systems are organized into eleven regional clusters:
Los Angeles, Florida, New England, Ohio/Kentucky/West Virginia, Western New
York, Virginia, Western Pennsylvania, Eastern Pennsylvania, Puerto Rico,
Colorado Springs and New Jersey. Our systems are located primarily in suburban
areas of large and medium-sized cities within the 50 largest television
markets.
 
   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. Hyperion managed and operated 22
telecommunications networks, including two under construction, serving 46
cities as of December 31, 1998. Hyperion's Class A common stock is quoted on
the Nasdaq National Market under the symbol "HYPT."
 
Recent Developments
 
   On April 23, 1999, Adelphia entered into an agreement to sell, and on April
28, 1999 expects to consummate an offering of $350 million of 7 7/8% Senior
Notes due 2009. Net proceeds from this offering, after deducting offering
expenses, are estimated to be approximately $345 million. The net proceeds are
expected to be used to repay borrowings under subsidiary credit agreements, all
of which, subject to compliance with the terms of and maturities of the
revolving credit facilities, may be reborrowed and used for general corporate
purposes, including acquisitions, capital expenditures and investments.
 
 
                                      S-2
<PAGE>
 
   On April 21, 1999, Adelphia announced that it had filed a supplement to its
shelf registration statement with the Securities and Exchange Commission for a
public offering of 2.0 million shares of a new series of convertible preferred
stock. See "Convertible Preferred Stock Offering."
 
   On April 12, 1999, Adelphia announced that it had entered into a definitive
agreement to purchase the cable television systems owned by Harron
Communications Corp. for $1.2 billion in cash. This transaction is subject to
customary closing conditions. As of December 31, 1998, Harron had approximately
294,000 basic subscribers after giving effect to recent and pending
acquisitions involving approximately 9,000 basic subscribers.
 
   On April 9, 1999, Adelphia entered into a stock purchase agreement with
Highland Holdings, a general partnership controlled by members of the family of
John J. Rigas, in which Adelphia agreed to sell to Highland Holdings, and
Highland Holdings agreed to purchase, from $250 million to $375 million of
Adelphia's Class B common stock. The purchase price for the Class B common
stock will be equal to the public offering price set forth on the cover page of
this prospectus supplement less the underwriting discount, plus an interest
factor. Closing under this stock purchase agreement is to occur within 270 days
following the closing of the offering of Class A common stock under this
prospectus supplement. See "Use of Proceeds."
 
   On March 5, 1999, Adelphia announced that it had entered into a definitive
merger agreement to acquire Century Communications Corp. Under the agreement,
Adelphia would acquire the outstanding common stock of Century for an aggregate
of approximately $826 million in cash, 48.7 million shares of Class A common
stock and the assumption of approximately $1.6 billion of debt. This
transaction is subject to shareholder approval by Century and Adelphia and
other customary closing conditions. As of December 31, 1998, Century had
approximately 1,593,000 basic subscribers after giving effect to Century's
pending joint venture with AT&T.
 
   On March 2, 1999, Hyperion issued $300 million of 12% Senior Subordinated
Notes due 2007. An entity controlled by members of the Rigas family purchased
$100 million of the $300 million of Senior Subordinated Notes directly from
Hyperion at a price equal to the aggregate principal amount less the discount
to the initial purchasers. The net proceeds of approximately $292 million will
be used to fund Hyperion's acquisition of interests held by local partners in
certain of its networks, for capital expenditures and investments in its
networks, for working capital purposes and for general corporate purposes.
 
   On February 23, 1999, Adelphia announced that it had entered into a
definitive agreement to acquire FrontierVision Partners, L.P. for approximately
$2.1 billion. Under the agreement, Adelphia would acquire FrontierVision in
exchange for approximately $550 million in cash, 7 million shares of Class A
common stock and the assumption of approximately $1.1 billion of debt. The
transaction is subject to customary closing conditions. As of December 31,
1998, FrontierVision had approximately 702,000 basic subscribers.
 
   On January 29, 1999, Adelphia purchased from Telesat Cablevision, Inc., a
subsidiary of FPL Group, Inc., shares of Adelphia's stock owned by Telesat.
Adelphia purchased 1,091,524 shares of Class A common stock and 20,000 shares
of Series C cumulative convertible preferred stock which are convertible into
an additional 2,358,490 shares of Class A common stock. These shares represent
 
                                      S-3
<PAGE>
 
3,450,014 shares of common stock on a fully converted basis. Adelphia and
Telesat also agreed to a redemption of Telesat's interests in Olympus
Communications, L.P. by July 11, 1999. The redemption is subject to applicable
third party approvals. The aggregate purchase price for these transactions will
be approximately $257.2 million.
 
   On January 21, 1999, Adelphia acquired Verto Communications, Inc. In
connection with the Verto acquisition, Adelphia issued 2,561,024 shares of its
Class A common stock to the former owners of Verto. Verto provided cable
television services to approximately 56,000 basic subscribers in the greater
Scranton, Pennsylvania area at the date of acquisition.
 
   On January 14, 1999, Adelphia completed offerings totaling 8.6 million
shares of its Class A common stock. Adelphia used the net proceeds of
approximately $372 million from these offerings to repay subsidiary bank debt.
 
   On January 13, 1999, Adelphia completed offerings of $100 million of 7 1/2%
Senior Notes due 2004 and $300 million of 7 3/4% Senior Notes due 2009. Net
proceeds from these offerings, after deducting offering expenses, were
approximately $393.7 million. Of this amount, Adelphia used approximately $160
million to redeem a portion of its 9 1/2% Senior Pay-In-Kind Notes due 2004.
Adelphia used the remainder to repay borrowings under revolving credit
facilities of its subsidiaries. The terms of the notes are similar to those of
Adelphia's existing publicly held senior debt.
 
   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 Main at Water Street, Coudersport,
Pennsylvania 16915, and our telephone number is (814) 274-9830.
 
 
                                      S-4
<PAGE>
 
                                 The Offerings
 
Class A Common Stock Offered........    8,000,000 shares
 
Common Stock to be Outstanding:
   Class A Common Stock.............    50,328,343 shares (1)
   Class B Common Stock ............    10,834,476 shares (2)
                                        --------
    Total ..........................    61,162,819 shares
                                        --------
                                        --------
 
Use of Proceeds.....................    The net proceeds from the Class A
                                        common stock offering will be used
                                        to fund recently announced
                                        acquisitions. See "Use of
                                        Proceeds."
 
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 1 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 Stock Market Symbol for
 Class A Common Stock...............
                                        ADLAC
- --------
(1)  Does not include 9,433,962 shares of Class A common stock into which
     Series C cumulative convertible preferred stock can be converted or any
     shares of Class A common stock into which the Series D convertible
     preferred stock, which Adelphia is offering, could be converted if issued.
     See "Convertible Preferred Stock Offering" in this prospectus supplement
     and "Description of Capital Stock--Preferred Stock" in the attached
     prospectus.
 
(2)  Does not include any shares to be sold under the Highland Holdings stock
     purchase agreement dated April 9, 1999.
 
 
                                      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's Class
A common stock.
 
High Level Of Indebtedness Adelphia has a substantial amount of debt. We
                           borrowed this money to purchase and to expand our
                           cable systems and other operations and, to a lesser
                           extent, for investments and loans to our
                           affiliates. At December 31, 1998, our indebtedness
                           totaled approximately $3.5 billion. This included
                           approximately:
 
   As of December 31,
1998, we owed
approximately $3.5
billion and as of that
date we would have owed
approximately $5.6
billion after the
acquisition of Century,
$6.8 billion after the
acquisition of Century
and FrontierVision
and $8.6 billion after
such transactions and
the Harron and Olympus
acquisitions. Our high
level of indebtedness
can have important
adverse consequences to
us and to you.
 
                           .  $1.8 billion of Adelphia Parent Company public
                              debt;
 
                           .  $1.2 billion of debt owed by our subsidiaries to
                              banks, other financial institutions and other
                              persons; and
 
                           .  $471 million of public debt owed by Hyperion,
                              Adelphia's competitive local exchange carrier
                              subsidiary.
 
                           Olympus, a non-consolidated joint venture, also has
                           approximately $727 million of debt. Olympus will be
                           consolidated with Adelphia upon completion of
                           Adelphia's proposed acquisition of interests in
                           Olympus. That acquisition is expected to close in
                           July 1999.
 
   We may need to          Century and its subsidiaries have substantial
refinance significant      indebtedness. At February 28, 1999, Century and its
Century indebtedness       subsidiaries had long-term debt of approximately
that we will be            $2.0 billion (exclusive of current maturities of
assuming.                  $20.1 million), including approximately $1.9
                           billion principal amount of public indebtedness
                           under nine indentures, $97 million of indebtedness
                           under four credit agreements entered into by
                           subsidiaries of Century and various banks and $80
                           million of indebtedness under a note agreement
                           entered into by a subsidiary of Century.
 
                           Without a consent from the lenders to Century's
                           subsidiaries, the Century merger will violate
                           certain covenants contained in the Century credit
                           agreements. As a result, we will either secure a
                           waiver from the lenders under these credit
                           agreements or will refinance such credit agreements
                           with new or existing credit facilities. Although we
                           currently have sufficient liquidity under our
                           existing credit facilities to refinance the
                           borrowings under Century's credit agreements,
                           Adelphia is seeking consents to keep some or all of
                           such credit agreements in place. In the event that
                           these consents cannot be obtained upon reasonable
                           terms, we could seek to refinance some or all of
                           them under one or more
 
                                      S-6
<PAGE>
 
                           new facilities in order to preserve our existing
                           liquidity. There can be no assurance, however, that
                           we will be able to obtain these consents or
                           refinance these credit agreements under any terms
                           or on terms acceptable to Adelphia. As a result,
                           the failure to obtain the required consents or to
                           refinance these credit agreements could materially
                           decrease Adelphia's liquidity.
 
                           Under the indentures for Century's public notes,
                           the merger will require Century to make an offer to
                           purchase the public notes if the merger results in
                           the public notes being downgraded to a specified
                           level by certain national rating agencies. Upon
                           announcement of the merger, certain rating agencies
                           announced that the Century notes were under review
                           with a view to a downgrade to a level which would
                           not require Century to make an offer to repurchase
                           public notes. In the event that the public notes
                           were to be downgraded to a level beyond that
                           announced by the rating agencies upon disclosure of
                           the merger, Century would be required to make an
                           offer to repurchase the public notes at 101% of the
                           amount of the notes. In the event that a
                           significant amount of notes were tendered to
                           Century for repurchase, this could materially
                           decrease Adelphia's liquidity.
 
   We may need to          On February 23, 1999, we announced our proposed
refinance significant      acquisition of FrontierVision. FrontierVision and
FrontierVision             its subsidiaries have substantial indebtedness. At
indebtedness that we       December 31, 1998, FrontierVision and its
will be assuming.          subsidiaries had nonaffiliate long-term debt of
                           approximately $1.1 billion, including approximately
                           $672 million owed to banks under a credit agreement
                           and approximately $450 million owed under three
                           indentures for public notes. We are attempting to
                           secure consents and waivers from the lenders to
                           permit the credit agreement to remain outstanding.
                           As a result of the acquisition by Adelphia, the
                           indentures for the public debt will require
                           FrontierVision to make an offer to repurchase the
                           public notes at 101% of the amount of the public
                           notes. In the event that the lenders do not consent
                           to permitting the credit agreement to remain
                           outstanding or a significant amount of the public
                           notes are tendered to FrontierVision for
                           repurchase, this could materially decrease our
                           liquidity.
 
   We will need to raise   We will need to raise significant funds to pay for
significant financing      the $1.2 billion acquisition of Harron.
for the Harron
acquisition.
 
                           The Century, FrontierVision, Olympus and Harron
                           acquisitions are reflected in Adelphia's unaudited
                           condensed consolidated pro forma financial
                           statements incorporated by reference in this
                           prospectus supplement.
 
 
                                      S-7
<PAGE>
 
   Debt service consumes
a substantial portion of   Our high level of indebtedness can have important
the cash we generate.      adverse consequences to us and to you. It requires
This could affect our      that we spend a substantial portion of the cash we
ability to invest in our   get from our business to repay the principal and
business in the future     interest on these debts. Otherwise, we could use
as well as to react to     these funds for general corporate purposes or for
changes in our industry    capital improvements. Our ability to obtain new
or economic downturns.     loans for working capital, capital expenditures,
                           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 had
                           approximately $148 million and Hyperion had
                           approximately $229 million of redeemable
                           exchangeable preferred stock which contain payment
                           obligations that are similar to Adelphia's debt
                           obligations.
 
   Approximately 32% of    Our debt comes due at various times up to the year
our debt outstanding at    2009, including an aggregate of approximately $1.1
December 31, 1998 must     billion as of December 31, 1998, which we must pay
be paid by April 1, 2003   by April 1, 2003.
and all of it must be
paid by 2009.
 
                           As discussed above, Century, FrontierVision and
                           Olympus also have a substantial amount of debt.
                           Under its current terms, this debt comes due at
                           various times up to the year 2017, including an
                           aggregate of approximately $1.6 billion as of
                           December 31, 1998 (May 31, 1998 as to Century),
                           which must be paid over the next five years.
 
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
Able To Upgrade Our
Plant, Offer Services,
Make Payments When Due
Or Refinance Existing
Debt
 
                           .  constructing and upgrading our plant and
                              networks--some of these upgrades we must make to
                              comply with the requirements of local cable
                              franchise authorities;
 
                           .  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          $1.0 billion.
Continue
 
                                      S-8
<PAGE>
 
                           Our continuing net losses, which 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--$119.9
                              million;
 
                           .  fiscal year ended March 31, 1997--$130.6
                              million;
 
                           .  fiscal year ended March 31, 1998--$192.7
                              million; and
 
                           .  nine months ended December 31, 1998--$135.8
                              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 Hyperion's preferred stock
                           dividends:
 
<TABLE>
<CAPTION>
                                                      Earnings  Non-Cash
                                                     Deficiency Charges
                                                     ---------- --------
                                                       (in thousands)
                 <S>                                 <C>        <C>
                 . fiscal year ended March 31, 1996   $ 78,189  $127,319
                 . fiscal year ended March 31, 1997   $ 61,848  $165,426
                 . fiscal year ended March 31, 1998   $113,941  $195,153
                 . nine months ended December 31,
                 1998                                 $116,899  $186,022
</TABLE>
 
   If we cannot            Historically, the cash we generate from our
refinance our debt         operating activities and borrowings has been
including debt incurred    sufficient to meet our requirements for debt
in connection with the     service, working capital, capital expenditures and
acquisitions of            investments in and advances to our affiliates, and
FrontierVision and         we have depended on additional borrowings to meet
Century or obtain new      our liquidity requirements. Although in the past we
loans, we would likely     have been able both to refinance our debt and to
have to consider various   obtain new debt, there can be no guarantee that we
options such as the sale   will be able to continue to do so in the future or
of additional equity or    that the cost to us or the other terms which would
some of our assets to      affect us would be as favorable to us as current
meet the principal and     loans and credit agreements. We believe that our
interest payments we       business will continue to generate cash and that we
owe, negotiate with our    will be able to obtain new loans to meet our cash
lenders to restructure     needs. However, the covenants in the indentures and
existing loans or          credit agreements for our current debt provide some
explore other options      limitations on our ability to borrow more money.
available under
applicable laws
including those under
reorganization or
bankruptcy laws. We
cannot guarantee that
any options available to
us would enable us to
repay our debt in full.
 
                                      S-9
<PAGE>
 
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, and Multichannel
could adversely affect     Multipoint Distribution systems. Some of the
revenue or revenue         regional Bell telephone operating companies and
growth.                    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
                           Adelphia 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.
 
                           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
 
                                      S-10
<PAGE>
 
                           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         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 for providing local
                           telephone service. In addition, the long distance
                           carriers 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.
 
 
                                      S-11
<PAGE>
 
We Are Subject To
Extensive Regulation       The cable television industry and the provision of
                           local telephone exchange services are subject to
                           extensive regulation at the federal, state and
                           local levels, and many aspects of such regulation
                           are currently the subject of judicial proceedings
                           and administrative or legislative proposals. In
                           particular, the FCC adopted regulations that limit
                           our ability to set and increase rates for our basic
                           service package and for the provision of cable
                           television-related equipment. The law permits
                           certified local franchising authorities to order
                           refunds of rates paid in the previous 12-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.
 
   Our cable television
and telecommunications
businesses are heavily
regulated as to rates we
can charge and other
matters. This regulation
could limit our ability
to increase rates, cause
us to decrease then
current rates or require
us to refund previously
collected fees.
 
                           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.
 
   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 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
                           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.
 
                           Adelphia has two classes of common stock--Class A
Unequal Voting Rights      which carries one vote per share and Class B which
Of Stockholders            carries ten votes per share. Under Adelphia's
                           Certificate of Incorporation, the Class A shares
                           elect only one of our eight directors.
 
                                      S-12
<PAGE>
 
Control Of Voting Power
By The Rigas Family        As of April 1, 1999, the Rigas family beneficially
                           owned shares representing about 48% of the total
                           number of outstanding shares of both classes of
                           Adelphia's common stock and about 81% of the total
                           voting power of Adelphia's shares. The public holds
                           a majority of the outstanding shares of Class A
                           common stock, although the Rigas family also owns
                           approximately 36% of those shares as of April 1,
                           1999. The Rigas family owns approximately 99% of
                           Adelphia's shares of Class B common stock. 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. 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 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 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 Highland Holdings stock
                           purchase agreement dated April 9, 1999 will
                           increase the voting power of the Rigas family.
 
   The Rigas family can
control stockholder
decisions on very
important matters.
 
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 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 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 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.
 
                                      S-13
<PAGE>
 
   The Adelphia Parent
Company depends on its     The public indentures and the credit agreements for
subsidiaries and other     bank and other financial institution loans of our
companies in which it      subsidiaries and other companies in which we have
has investments to fund    invested, restrict their ability and the ability of
its cash needs.            the companies they own to make payments to the
                           Adelphia Parent Company. These agreements also
                           place other restrictions on the borrower's ability
                           to borrow new funds and include requirements for
                           the borrowers to remain in compliance with the
                           credit agreements. 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, or availability for sale, of a substantial
Common Stock Could         number of shares of our 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 26, 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 Class A common
                           stock, consisting of 15,029,119 shares, Class B
                           common stock, consisting of 10,736,544 shares and
                           the equivalent number of shares of Class A common
                           stock into which they may be converted, and Series
                           C cumulative convertible preferred stock,
                           consisting of 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 Series C
                              cumulative convertible preferred stock and the
                              Class A common stock issuable upon conversion of
                              the Series C cumulative convertible preferred
                              stock;
 
                           .  for Booth American Company--3,571,428 shares of
                              Class A common stock owned as of March 24, 1998;
 
                           .  for the selling stockholders receiving shares in
                              the Verto acquisition--2,561,024 shares of Class
                              A common stock;
 
                                      S-14
<PAGE>
 
                           .  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--7,000,000
                              shares of Class A common stock in connection
                              with the pending FrontierVision acquisition, and
                              for the benefit of FrontierVision in certain
                              circumstances if the transaction does not close,
                              1,000,000 shares of Class A common stock; and
 
                           .  for the owners of Century--approximately
                              48,700,000 shares of Class A common stock to be
                              issued in connection with the pending Century
                              acquisition.
 
                           Approximately 14,904,000 shares of Class A common
                           stock and up to 80,000 shares of Series C
                           cumulative convertible preferred stock, including
                           the underlying Class A common stock, have been
                           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.
 
The Century Merger May     The Century merger requires approvals from
Not Be Completed If The    Century's stockholders and our stockholders.
Required Approval Of       Although the Class B stockholders of Century and
Century's Class A          the controlling stockholders of Adelphia have
Stockholders Is Not        agreed to vote in favor of the merger, the
Obtained                   companies cannot be certain of the ultimate outcome
                           of the required vote of the Class A stockholders of
                           Century. If that vote is not obtained, the
                           companies will not be able to complete the proposed
                           transaction as currently structured or in a timely
                           manner, if at all.
 
   The failure to          Even if Century's stockholders approve the Century
satisfy conditions to      merger, one or more of the pending acquisitions may
completion of the          not close unless several other conditions are met.
acquisitions could         These include:
jeopardize the
acquisitions.
 
                           .  Receipt of all required consents of governmental
                              authorities have been received, except where the
                              failure to obtain any such required consent
                              would not have a material adverse effect;
 
                           .  Clearance under antitrust laws;
 
                           .  Neither Adelphia nor the selling parties have
                              breached any of their respective
                              representations, warranties or covenants made in
                              the applicable agreement; and
 
                           .  There is no law or court order prohibiting the
                              applicable acquisition.
 
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
 
                                      S-15
<PAGE>
 
                           continue to expand and improve our operational and
                           financial systems and to expand, train and manage
                           our employee base.
 
                           The Century, FrontierVision and Harron transactions
                           and some of our other recent acquisitions involve
                           the acquisition of companies that have previously
                           operated independently. We may not be able to
                           integrate the 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 to be acquired in the
                           Century, FrontierVision and Harron 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.
 
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.
 
Year 2000 Issues Present   The year 2000 issue refers to the potential
Risks To Our Business      inability of computerized systems and technologies
Operations In Several      to properly recognize and process dates beyond
Ways                       December 31, 1999. This 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 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
 
                                      S-16
<PAGE>
 
                           parties with which we have a material relationship,
                           including parties acquired by us, may have a
                           material adverse effect on Adelphia, including
                           significant service interruption or outages;
                           however, we cannot currently estimate the extent of
                           any such adverse effects.
 
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
                           1998 Annual Report on Form 10-K and in Adelphia's
                           Form 10-Qs, is forward-looking, such as information
                           related 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 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-17
<PAGE>
 
                                USE OF PROCEEDS
 
   The net proceeds to Adelphia from the Class A common stock offering
described on the cover page of this prospectus supplement (the "Common Stock
Offering") will be approximately $485.5 million, after deducting estimated
underwriting discounts and commissions and offering expenses. Adelphia also
filed a prospectus supplement dated April 20, 1999 for an offering of 2,000,000
shares of a new Series D convertible preferred stock (the "Convertible
Preferred Stock Offering"). The net proceeds from the Convertible Preferred
Stock Offering, if consummated, are estimated to be approximately $194 million,
after deducting estimated underwriting discounts and commissions and offering
expenses. The net proceeds from the Common Stock Offering initially will be
advanced or contributed to Adelphia's subsidiaries which will apply such funds
to repay revolving credit facilities of such subsidiaries. As of December 31,
1998, the average effective interest rate on such credit facilities was
approximately 6.48%. 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
Adelphia intends to use to fund one or more of the recently announced
acquisitions. The net proceeds from the Convertible Preferred Stock Offering,
if consummated, are expected to be used in the same manner as the net proceeds
from the Common Stock Offering. Highland Holdings, a partnership controlled by
members of the Rigas family, has agreed in a stock purchase agreement dated
April 9, 1999, to purchase in the future at least $250 million of 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 "Rigas Direct Placement"). See Adelphia's Form 8-K
for the event dated April 9, 1999 for further information regarding the Rigas
Direct Placement. The net proceeds from the Rigas Direct Placement are expected
to be used to fund one or more of the recently announced acquisitions or for
general corporate purposes, although they may initially be similarly advanced
to Adelphia's subsidiaries or temporarily invested in short term investments.
 
                                      S-18
<PAGE>
 
                                 CAPITALIZATION
                (dollars in thousands except par value amounts)
 
   The following table sets forth the cash and cash equivalents and
capitalization of Adelphia as of December 31, 1998, on an actual and as
adjusted basis to reflect the Common Stock Offering, the Convertible Preferred
Stock Offering, the Rigas Direct Placement, the issuance of stock and debt
described in "Recent Developments" of this prospectus supplement and the
application of the net proceeds therefrom and the Century, FrontierVision,
Harron and Olympus acquisitions. The table does not reflect the sale of 7 7/8%
Senior Notes due 2009 described in "Recent Developments." 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>
                                                         December 31, 1998
                                                    ----------------------------
                                                      Actual     As Adjusted (b)
                                                    -----------  ---------------
<S>                                                 <C>          <C>
Cash and cash equivalents.........................  $   398,644    $   770,373
U.S. government securities--pledged...............       58,054         58,054
                                                    -----------    -----------
  Total cash, cash equivalents and U.S. government
   securities--pledged............................  $   456,698    $   828,427
                                                    ===========    ===========
Long-term debt including current maturities (a):
  Subsidiary debt.................................  $ 1,717,240    $ 6,560,566
  Parent debt.....................................    1,810,212      2,062,512
                                                    -----------    -----------
    Total long-term debt including current
     maturities...................................    3,527,452      8,623,078
                                                    -----------    -----------
Hyperion redeemable exchangeable preferred stock..      228,674        228,674
                                                    -----------    -----------
Redeemable exchangeable preferred stock...........      148,191        148,191
                                                    -----------    -----------
Convertible preferred stock, common stock and other
 stockholders' equity (deficiency):
  8 1/8% Series C cumulative convertible preferred
   stock ($100,000 liquidation preference)........            1              1
  New Series D convertible preferred stock
   ($200,000 liquidation preference)..............           --             20
  Class A common stock, $.01 par value,
   200,000,000 shares authorized; 31,258,843
   shares outstanding on an Actual basis and
   106,097,838 shares outstanding on an As
   Adjusted basis.................................          313          1,035
  Class B common stock, $.01 par value, 25,000,000
   shares authorized; 10,834,476 shares
   outstanding on an Actual basis and 14,948,856
   shares outstanding on an As Adjusted basis.....          108            149
Additional paid-in capital........................      738,102      5,185,725
Accumulated deficit...............................   (1,760,270)    (1,740,829)
Treasury stock, at cost, 0 shares on an Actual
 basis and 1,091,524 shares of Class A common
 stock and 20,000 shares of 8 1/8% Series C
 cumulative convertible preferred stock on an As
 Adjusted basis...................................           --       (149,213)
                                                    -----------    -----------
    Total convertible preferred stock, common
     stock and other stockholders' equity
     (deficiency).................................   (1,021,746)     3,296,888
                                                    -----------    -----------
      Total capitalization........................  $ 2,882,571    $12,296,831
                                                    ===========    ===========
</TABLE>
- --------
(a) See Note 3 to Adelphia's consolidated financial statements in the Form 10-K
    for a description of long-term debt of Adelphia and its subsidiaries. See
    "The Company--Management's Discussion and Analysis of Financial Condition
    and Results of Operations--Liquidity and Capital Resources" in the Form 10-
    K and the Form 10-Qs.
(b) Gives effect to (i) the application of the net proceeds of approximately
    $679.5 million from the Common Stock Offering and the Convertible Preferred
    Stock Offering and approximately $250 million from the Rigas Direct
    Placement as described in "Use of Proceeds," (ii) the Century,
    FrontierVision and Harron acquisitions, the Class A common stock, Series C
    cumulative convertible preferred stock and Olympus partnership interests
    repurchased from Telesat, and (iii) the application of the net proceeds of
    the January 1999 sale of Class A common stock, the 7 1/2% Senior Notes and
    the 7 3/4% Senior Notes, and the March 1999 sale of Hyperion's 12% Senior
    Subordinated Notes, as described in "Recent Developments." The above table
    does not otherwise give effect to any other transactions after December 31,
    1998 that are described in "Recent Developments."
 
                                      S-19
<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
                                                                ------- --------
      1997
      <S>                                                       <C>     <C>
        First Quarter Ended 3/31/97............................ $ 7 1/8 $ 5 3/8
        Second Quarter Ended 6/30/97........................... $ 7 3/4 $ 5
        Third Quarter Ended 9/30/97............................ $12 1/8 $ 6 3/4
        Fourth Quarter Ended 12/31/97.......................... $18 3/4 $12
<CAPTION>
      1998
      <S>                                                       <C>     <C>
        First Quarter Ended 3/31/98............................ $30 3/8 $16 3/8
        Second Quarter Ended 6/30/98........................... $37 1/8 $21 1/2
        Third Quarter Ended 9/30/98............................ $44     $30 7/16
        Fourth Quarter Ended 12/31/98.......................... $48 1/8 $29 1/8
<CAPTION>
      1999
      <S>                                                       <C>     <C>
        First Quarter Ended 3/31/99............................ $64 3/8 $44 7/8
        Second Quarter (through 4/22/99)....................... $72 3/8 $58 3/4
</TABLE>
 
   As of April 19, 1999, approximately 158 holders of record held our Class A
common stock. As of that date, five record holders were registered clearing
agencies holding Class A common stock on behalf of participants in such
clearing agencies.
 
   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 seven
persons, principally 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 99.1% 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-20
<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 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
the Common Stock Offering and the pro forma net tangible book value per share
of the common stock immediately after completion of the Common Stock Offering,
excluding the Rigas Direct Placement and the Convertible Preferred Stock
Offering. Prior to the Common Stock Offering, but after giving effect to the
January 1999 sale of Class A common stock, the Class A common stock and 8 1/8%
Series C cumulative convertible preferred stock repurchased from Telesat, the
Verto acquisition, and the issuance of 1,000,000 shares of Class A common stock
placed in escrow associated with the FrontierVision acquisition, the pro forma
net tangible book value of Adelphia as of December 31, 1998 was a deficit of
approximately $1,748,345,000, or negative $32.89 per share of common stock.
After giving effect to the sale by Adelphia of 8,000,000 shares of Class A
common stock in the Common Stock Offering at a public offering price of $61.75
per share, and after deduction of underwriting discounts and commissions and
estimated offering expenses, the pro forma net tangible book value of Adelphia
as of December 31, 1998 was a deficit of approximately $1,262,845,000, or
negative $20.65 per share of common stock. This represents an immediate
increase in net tangible book value of $12.24 per share to existing
stockholders and an immediate dilution of net tangible book value of $82.40 per
share to purchasers of Class A common stock in the Common Stock Offering, as
illustrated in the following table:
 
<TABLE>
<S>                                                           <C>      <C>
Public offering price per share of Class A common stock......          $ 61.75
  Net tangible book value per share of common stock before
   the Common Stock Offering................................. $(32.89)
  Increase per share of common stock attributable to the
   Common Stock Offerings....................................   12.24
                                                              -------
Pro forma net tangible book value per share of common stock
 after the Common Stock Offering.............................           (20.65)
                                                                       -------
Net tangible book value dilution per share...................          $(82.40)
                                                                       =======
</TABLE>
 
 
                                      S-21
<PAGE>
 
                     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. For purposes of determining
whether tax is to be withheld at a 30% rate or at a reduced rate as specified
by an income tax treaty, Adelphia ordinarily will presume that dividends paid
to an address in a foreign country are paid to a resident of such country
absent knowledge that such presumption is not warranted. However, under United
States Treasury regulations not currently in effect, a Non-United States Holder
would be required to file certain forms accompanied by a statement from a
competent authority of the treaty country in order to claim the benefits of a
tax treaty. Dividends paid to a holder with an address within the United States
generally will not be subject to this withholding tax, unless Adelphia has
actual knowledge that the holder is a Non-United States Holder.
 
   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 4224 (Statement Claiming Exemption
from Withholding of Tax on Income Effectively Connected With the Conduct of
Business in the United States) each year with Adelphia or its paying agent
prior to the payment of the dividends for such year. 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. 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").
 
 
                                      S-22
<PAGE>
 
   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 heading 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. 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
will generally not apply to dividends paid to holders at an address outside the
United States (unless Adelphia has knowledge that the holder is a United States
person.)
 
   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
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
 
                                      S-23
<PAGE>
 
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") will generally be effective for
payments made after December 31, 1999, subject to certain transition rules. The
New Withholding Regulations modify and, in general, unify the way in which you
establish your status as a non-United States "beneficial owner" eligible for
withholding exemptions including a reduced treaty rate or an exemption from
backup withholding. For example, the New Withholding Regulations will require
new forms, which you generally will have to provide earlier than you would have
had to provide replacements for expiring existing forms.
 
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-24
<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 set forth opposite its
name:
 
<TABLE>
<CAPTION>
                                                                        Number
      Name                                                             of Shares
      ----                                                             ---------
      <S>                                                              <C>
      Salomon Smith Barney Inc. ...................................... 7,998,600
      Goldman, Sachs & Co. ...........................................       300
      Credit Suisse First Boston Corporation..........................       200
      Donaldson, Lufkin & Jenrette Securities Corporation.............       200
      Merrill Lynch, Pierce, Fenner & Smith Incorporated..............       200
      Morgan Stanley & Co. Incorporated...............................       200
      Credit Lyonnais Securities (USA) Inc. ..........................       100
      NationsBanc Montgomery Securities LLC...........................       100
      SG Cowen Securities Corporation.................................       100
                                                                       ---------
       Total.......................................................... 8,000,000
                                                                       =========
</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 if they purchase any
of the shares.
 
   The underwriters, for whom Salomon Smith Barney Inc., Goldman, Sachs & Co.,
Credit Suisse First Boston Corporation, Donaldson, Lufkin & Jenrette Securities
Corporation, Merrill Lynch, Pierce, Fenner & Smith Incorporated, Morgan Stanley
& Co. Incorporated, Credit Lyonnais Securities (USA) Inc., NationsBanc
Montgomery Securities LLC and SG Cowen Securities Corporation are acting as
representatives, 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.
 
 
                                      S-25
<PAGE>
 
   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 6 months from the closing of the Rigas Direct Placement, but not to exceed a
year from the closing of our public offering of Class A common stock under this
prospectus supplement.
 
   The common stock is quoted on the Nasdaq National Market under the symbol
"ADLAC."
 
   The following table shows the underwriting discounts and commissions to be
paid to the underwriters by us in connection with this offering.
 
<TABLE>
<CAPTION>
      <S>                                                             <C>
      Per Share......................................................    $0.9875
      Total.......................................................... $7,900,000
</TABLE>
 
   In connection with the offering, Salomon Smith Barney Inc., may engage in
syndicate covering transactions, stabilizing transactions and penalty bids.
Syndicate covering transactions involve purchases of the 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 common stock made for the purpose of preventing or retarding a
decline in the market price of the common stock while the offering is in
progress. Penalty bids permit the underwriters to reclaim a selling concession
from a syndicate member when Salomon Smith Barney Inc., 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
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.
 
                                      S-26
<PAGE>
 
   In addition, in connection with this offering, certain of the underwriters
(and selling group members) may engage in passive market making transactions in
the common stock on the Nasdaq National Market, prior to the pricing and
completion of the 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 common stock during a specified
period and must be discontinued when such limit is reached. Passive market
making may cause the price of the 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 $600,000.
 
   The representatives have performed certain investment banking and advisory
services for us from time to time for which they have received customary fees
and expenses. The representatives may, from time to time, engage in
transactions with and perform services for us in the ordinary course of their
business. In addition, Salomon Smith Barney Inc. and Credit Suisse First Boston
Corporation will act as joint lead managers in our Convertible Preferred Stock
Offering, and Goldman, Sachs & Co. and NationsBanc Montgomery Securities LLC
will act as co-managers in our Convertible Preferred Stock Offering.
 
   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.
 
                      CONVERTIBLE PREFERRED STOCK OFFERING
 
   A new series of preferred stock is being offered in the Convertible
Preferred Stock Offering and will consist of 2,000,000 shares of a new Series D
convertible preferred stock. The exact terms for this new series of convertible
preferred stock would be determined when it is sold. This convertible preferred
stock is expected to be convertible by its holders into Class A common stock.
This convertible preferred stock is also expected to have an annual cumulative
cash dividend preference. We could not pay any dividends on common stock unless
all cumulative dividends due on this convertible preferred stock have been paid
or declared and a sum sufficient for payment set aside. In addition, if
dividends have not been paid for six quarters, these convertible preferred
shareholders are expected to have the right to elect two directors to our board
of directors until the dividend arrearage has been paid or set aside for
payment. This convertible preferred stock is also expected to have a
liquidation preference of $100 per share plus any unpaid dividends, which would
have to be paid before any amounts could be paid to holders of common stock in
a dissolution or other liquidation of Adelphia. This convertible preferred
stock is expected to be redeemable at the option of Adelphia, in whole or in
part at any time on and after three years from its issuance, for shares of
Class A common stock, at a redemption price of $103 per share of convertible
preferred stock, or for cash at a redemption price of $100 per share of
convertible preferred stock, in each case plus accrued and unpaid dividends.
Offers for this convertible preferred stock are only being made by
 
                                      S-27
<PAGE>
 
delivery of the prospectus supplement relating to the Convertible Preferred
Stock Offering. No requirement exists that we sell this convertible preferred
stock. We could decide not to sell this convertible preferred stock or to sell
more or less convertible preferred stock than we presently are offering in the
Convertible Preferred Stock Offering. In addition, since the actual terms of
this convertible preferred stock will not be determined until and unless it is
sold, it may have important additional terms or terms which differ materially
from those set forth above.
 
                      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 it files 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 March 31, 1998, which
     incorporates, in Items 7 and 8 to such Form 10-K, portions of the Form
     10-K for the 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 (collectively, the "Form
     10-Qs");
 
  .  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, and
     April 23, 1999;
 
  .  our definitive proxy statement dated September 11, 1998 with respect to
     the Annual Meeting of Stockholders held on October 6, 1998; and
 
 
                                     S-28
<PAGE>
 
  .  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 have 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
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 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
2,300 shares of our Class A common stock and 15,100 shares of Hyperion's 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
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
supplement 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 the 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 expects in accounting and auditing.
 
                                      S-29
<PAGE>
 
   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 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 supplement 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.
 
 
                                      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. $1,761,000,000, 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 April 19, 1999, the closing sale
price on the Nasdaq National Market of a single share of Class A common stock
was $59.969.
 
   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 April 20, 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........................................................   35
 
Plan of Distribution.......................................................   37
 
Where You Can Find More Information........................................   39
 
Legal Matters..............................................................   40
 
Experts....................................................................   41
</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
 
                           Adelphia has a substantial amount of debt. We
   As of December 31,      borrowed this money to purchase and to expand our
1998, we owed              cable systems and other operations and, to a lesser
approximately $3.5         extent, for investments and loans to our
billion. Our high level    affiliates. At December 31, 1998, our indebtedness
of indebtedness can have   totaled approximately $3,527,452,000. This included
important adverse          approximately:
consequences to us and
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                                                     
Able To Upgrade Our        .  constructing and upgrading our plant and      
Plant, Offer Services,        networks--some of these upgrades we must make 
Make Payments When Due        to comply with the requirements of local      
Or Refinance Existing         cable franchise authorities;                  
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      
And Negative               The Total Convertible Preferred Stock, Common Stock
Stockholders' Equity And   and Other Stockholders' Equity (Deficiency) at
We Expect This To          December 31, 1998 was a deficit of approximately
Continue                   $1,021,746,000. Our continuing net losses, which
                           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          
telephone companies        Some of the Regional Bell operating companies have
continue to seek other     also recently filed petitions with the FCC
regulatory approvals       requesting waivers of other obligations under the
that could significantly   federal Telecommunications Act of 1996. These
enhance their              involve services Hyperion also provides such as
competitive position       high speed data, long distance, and services to
against Hyperion.          Internet Service Providers. If the FCC grants the
                           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
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 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      
Stockholders               Adelphia has two classes of common stock--Class A
                           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
By The Rigas Family           
                           As of April 1, 1999, the Rigas family beneficially
   The Rigas family can    owned shares representing about 48% of the total
control stockholder        number of outstanding shares of both classes of
decisions on very          Adelphia's common stock and about 81% of the total
important matters.         voting power of Adelphia's shares. The public holds
                           a majority of the outstanding Class A shares,
                           although the Rigas family also owns about 36% of
                           those shares as of April 1, 1999. The Rigas family
                           owns about 99% of Adelphia's Class B shares. The
                           Rigas family also owns shares of Adelphia's 8%
                           Series C Cumulative Convertible preferred stock
                           which, if converted, would increase its voting
                           power and beneficial ownership. As a result of the
                           Rigas family's stock ownership and an     
 




 
                                       10
<PAGE>
 
                              
                           agreement among the Class B stockholders, members
                           of the Rigas family as of April 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
Structure And Potential    The Adelphia Parent Company directly owns no
Impact Of Restrictive      significant assets other than stock, partnership
Covenants In Subsidiary    interests, equity and other interests in our
Debt Agreements            subsidiaries and in other companies. This creates
                           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               
Outstanding Common Stock   Sales of a substantial number of shares of Class A
Could Adversely Affect     common stock or Class B common stock, including
The Market Price Of Our    sales by any pledgees of such shares, could
Common Stock               adversely affect the market price of our 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 26, 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 April 18, 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 April 18,
                                 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      
Stock Will Incur           Persons purchasing common stock will incur
Immediate Dilution         immediate and substantial net tangible book value
                           dilution.     
 
 
Adelphia's Acquisitions       
And Expansion Could        Because we are experiencing a period of rapid
Involve Operational        expansion through acquisition, the operating
Risks                      complexity of Adelphia, as well as the
                           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 April 18, 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 its 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 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,
 
                                       28
<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 two classes of
     preferred stock--8 1/8% Series C Convertible preferred stock and 13%
     Cumulative Exchangeable preferred stock. For ease of reference, we refer
     to the 8 1/8% Series C convertible preferred stock as the Convertible
     preferred stock and 13% Series B Cumulative Exchangeable preferred stock
     as the Exchangeable preferred stock; and     
     
  .  In connection with the foregoing designations, the maximum number of
     shares authorized of 8 1/8% Convertible preferred stock and Exchangeable
     preferred stock is 100,000 shares and 1,500,000 shares, respectively.
            
   Convertible Preferred Stock. The Convertible preferred stock accrues
cumulative dividends at the rate of 8 1/8% per annum, or $81.25 per share of
the 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. The 8 1/8% Convertible preferred stock ranks
pari passu with the Exchangeable preferred stock and ranks senior to the
common stock of Adelphia with respect to dividends and liquidation.     
   
   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 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.     
 
                                      33
<PAGE>
 
   
   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.     
 
   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;     
 
                                       34
<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 and the
Exchangeable 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.
 
                                       35
<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.
 
                                       36
<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
 
                                       37
<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.
 
                                       38
<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
 
   Adelphia files annual, quarterly and special reports, as well as proxy
statements and other information with the SEC. You may read and copy any
document Adelphia files 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. Adelphia's 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 Adelphia that
file electronically with the SEC.
 
   This prospectus is part of a registration statement on Form S-3 filed by
Adelphia 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 Adelphia to "incorporate by reference" into this prospectus
the information it files with the SEC. This means that Adelphia 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 Adelphia subsequently files 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.
 
   Adelphia is incorporating by reference the following documents that it has
filed with the SEC:
 
  .  its 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
 
                                       39
<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;
 
  .  its Quarterly Reports on Form 10-Q for the quarters ended June 30, 1998
     September 30, 1998 and December 31, 1998;
     
  .  its 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 and April 19, 1999;     
 
  .  its definitive proxy statement dated September 11, 1998 with respect to
     the Annual Meeting of Stockholders held on October 6, 1998; and
     
  .  the description of its Class A common stock contained in Adelphia's
     registration statement filed with the SEC under Section 12 of the
     Exchange Act and subsequent amendments and reports filed to update such
     description.     
       
       
   Adelphia is also incorporating by reference into this prospectus all of its
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. Adelphia is 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.
 
                                       40
<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.     
 
                                       41
<PAGE>
 
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                                8,000,000 Shares
 
                      Adelphia Communications Corporation
 
                              Class A Common Stock
 
                                 ADELPHIA LOGO
 
                               ----------------
 
                             PROSPECTUS SUPPLEMENT
                                 April 23, 1999
 
                               ----------------
 
                              Salomon Smith Barney
 
                              Goldman, Sachs & Co.
 
                           Credit Suisse First Boston
 
                          Donaldson, Lufkin & Jenrette
 
                              Merrill Lynch & Co.
 
                           Morgan Stanley Dean Witter
 
                     Credit Lyonnais Securities (USA) Inc.
 
                     NationsBanc Montgomery Securities LLC
 
                                    SG Cowen
 
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