DEFINED ASSET FUNDS MUNICIPAL DEFINED FUND SERIES 3
485BPOS, 1999-12-01
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 1, 1999

                                                      REGISTRATION NO. 333-62637
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                         POST-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-6

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

                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2

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

A. EXACT NAME OF TRUST:
                              DEFINED ASSET FUNDS
                           MUNICIPAL DEFINED FUND--3

B. NAME OF DEPOSITOR:

                   MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
                           SALOMON SMITH BARNEY INC.
                            PAINEWEBBER INCORPORATED
                           DEAN WITTER REYNOLDS INC.

C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:


 MERRILL LYNCH, PIERCE,
     FENNER & SMITH
      INCORPORATED
   DEFINED ASSET FUNDS
  POST OFFICE BOX 9051
PRINCETON, NJ 08543-9051                          SALOMON SMITH BARNEY INC.
                                                        388 GREENWICH
                                                     STREET--23RD FLOOR
                                                     NEW YORK, NY 10013

PAINEWEBBER INCORPORATED
   1285 AVENUE OF THE
        AMERICAS
   NEW YORK, NY 10019
                                                  DEAN WITTER REYNOLDS INC.
                                                       TWO WORLD TRADE
                                                     CENTER--59TH FLOOR
                                                     NEW YORK, NY 10048


D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:


  TERESA KONCICK, ESQ.
      P.O. BOX 9051
PRINCETON, NJ 08543-9051                              ROBERT E. HOLLEY
                                                      1200 HARBOR BLVD.
                                                     WEEHAWKEN, NJ 07087

                                COPIES TO:           DOUGLAS LOWE, ESQ.
                          PIERRE DE SAINT PHALLE, DEAN WITTER REYNOLDS INC.
    MICHAEL KOCHMANN               ESQ.                TWO WORLD TRADE
  388 GREENWICH STREET     450 LEXINGTON AVENUE      CENTER--59TH FLOOR
   NEW YORK, NY 10013       NEW YORK, NY 10017       NEW YORK, NY 10048


The issuer has registered an indefinite number of Units under the Securities Act
of 1933 pursuant to Rule 24f-2 and filed the Rule 24f-2 Notice for the most
recent fiscal year on March 25, 1999.

Check box if it is proposed that this filing will become effective on December
10, 1999 pursuant to paragraph (b) of Rule 485.  / x /

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<PAGE>
                                     DEFINED ASSET FUNDSSM
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                              MUNICIPAL DEFINED FUND--3
                              (A UNIT INVESTMENT TRUST)
                              O   PORTFOLIO OF LONG TERM MUNICIPAL BONDS
                              O   DESIGNED TO BE FREE OF REGULAR FEDERAL INCOME
                                  TAX
                              O   DISTRIBUTIONS TWICE A YEAR



SPONSORS:                      -------------------------------------------------
Merrill Lynch,                 The Securities and Exchange Commission has not
Pierce, Fenner & Smith         approved or disapproved these Securities or
Incorporated                   passed upon the adequacy of this prospectus. Any
Salomon Smith Barney Inc.      representation to the contrary is a criminal
PaineWebber Incorporated       offense.
Dean Witter Reynolds Inc.      Prospectus dated December 10, 1999.


<PAGE>
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Defined Asset FundsSM
Defined Asset FundsSM is America's oldest and largest family of unit investment
trusts, with over $160 billion sponsored over the last 28 years. Defined Asset
Funds has been a leader in unit investment trust research and product
innovation. Our family of Funds helps investors work toward their financial
goals with a full range of quality investments, including municipal, corporate
and government bond portfolios, as well as domestic and international equity
portfolios.

Defined Asset Funds offer a number of advantages:
   o A disciplined strategy of buying and holding with a long-term view is the
     cornerstone of Defined Asset Funds.
   o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
     funds are not managed and portfolio changes are limited.
   o Defined Portfolios: We choose the stocks and bonds in advance, so you know
     what you're investing in.
   o Professional research: Our dedicated research team seeks out stocks or
     bonds appropriate for a particular fund's objectives.
   o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's probably a Defined Asset Fund that suits your investment style. Your
financial professional can help you select a Defined Asset Fund that works best
for your investment portfolio.

THE FINANCIAL INFORMATION IN THIS PROSPECTUS IS AS OF THE EVALUATION DATE,
AUGUST 31, 1999.


CONTENTS
                                                              PAGE
                                                         ---------
Risk/Return Summary....................................          3
What You Can Expect From Your Investment...............          6
   Monthly Income......................................          6
   Return Figures......................................          6
   Records and Reports.................................          6
The Risks You Face.....................................          7
   Interest Rate Risk..................................          7
   Call Risk...........................................          7
   Reduced Diversification Risk........................          7
   Liquidity Risk......................................          7
   Collateral Related Risk.............................          7
   Concentration Risk..................................          7
   Bond Quality Risk...................................          8
   Insurance Related Risk..............................          8
   Litigation and Legislation Risks....................          8
Selling or Exchanging Units............................          9
   Sponsors' Secondary Market..........................          8
   Selling Units to the Trustee........................          8
   Exchange Option.....................................          9
How The Fund Works.....................................         10
   Pricing.............................................         10
   Evaluations.........................................         10
   Income..............................................         10
   Expenses............................................         10
   Portfolio Changes...................................         11
   Fund Termination....................................         11
   Certificates........................................         11
   Trust Indenture.....................................         12
   Legal Opinion.......................................         12
   Auditors............................................         12
   Sponsors............................................         12
   Trustee.............................................         13
   Underwriters' and Sponsors' Profits                          13
   Public Distribution.................................         13
   Code of Ethics......................................         13
   Year 2000 Issues....................................         13
Taxes..................................................         13
Supplemental Information...............................         15
Financial Statements...................................        D-1


                                       2
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RISK/RETURN SUMMARY


       1.  WHAT IS THE FUND'S OBJECTIVE?
           The Fund seeks interest income that is exempt from regular
           federal income taxes by investing in a fixed portfolio
           consisting primarily of 15-to 30-year municipal revenue
           bonds.
       2.  WHAT ARE MUNICIPAL REVENUE BONDS?
           Municipal revenue bonds are bonds issued by states,
           municipalities and public authorities to finance the cost
           of buying, building or improving various projects intended
           to generate revenue, such as airports, health care
           facilities, housing and municipal electric, water and sewer
           utilities. Generally, payments on these bonds depend solely
           on the revenues generated by the projects, excise taxes or
           state appropriations, and are not backed by the
           government's taxing power.
       3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
        O  The Fund plans to hold to maturity 26 long-term tax-exempt
           municipal bonds, and some short-term bonds reserved to pay
           the deferred sales charge, with an aggregate face amount of
           $15,260,000. The Fund is a unit investment trust which
           means that, unlike a mutual fund, the Fund's portfolio is
           not managed.
        o  The bonds are rated A or better by Standard & Poor's,
           Moody's or Fitch or in the opinion of the agent for the
           Sponsors have similar credit quality to other bonds in the
           portfolio.
        o  Most of the bonds cannot be called for several years, and
           after that they can be called at a premium declining over
           time to par value. Some bonds may be called earlier at par
           for extraordinary reasons.
        o  16% of the bonds are insured by AAA-rated insurance
           companies, 17% are insured by AA-rated insurance companies
           and 38% are insured by A-rated insurance companies that
           guarantee timely payments of principal and interest on the
           bonds (but not Fund units or the market value of the bonds
           before they mature).

           The Portfolio consists of municipal bonds of the following
           types:



                                                     APPROXIMATE
                                                      PORTFOLIO
                                                      PERCENTAGE



        o  Airports/Ports/Highways                          7%
        o  Convention Center                                7%
        o  General Obligation                               9%
        o  Hospitals/Health Care                           29%
        o  Municipal Water/Sewer Utilities                 13%
        o  Tax Allocation                                   1%
        o  State/Local Municipal Electric Utilities         7%
        o  University/College                              27%



       4.  WHAT ARE THE SIGNIFICANT RISKS?
           YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
           HAPPEN FOR VARIOUS REASONS, INCLUDING:
        o  Rising interest rates, an issuer's worsening financial
           condition or a drop in bond ratings can reduce the price of
           your units.
        o  Because the Fund is concentrated in hospital/health care
           and university/college bonds, adverse developments in these
           industries may affect the value of your units.
        o  Assuming no changes in interest rates, when you sell your
           units, they will generally be worth less than your cost
           because your cost included a sales fee.
        o  The Fund will receive early returns of principal if bonds
           are called or sold before they mature. If this happens your
           income will decline and you may not be able to reinvest the
           money you receive at as high a yield or as long a maturity.



       5.  IS THIS FUND APPROPRIATE FOR YOU?
           Yes, if you want federally tax-free income. You will
           benefit from a professionally selected and supervised
           portfolio whose risk is reduced by investing in bonds of
           several different issuers.
           The Fund is not appropriate for you if you want a
           speculative investment that changes to take advantage of
           market movements, if you do not want a tax-advantaged
           investment or if you cannot tolerate any risk.


                                       3
<PAGE>

           DEFINING YOUR INCOME


           WHAT YOU MAY EXPECT (RECORD DAY: 10TH DAY OF
           EACH APRIL AND OCTOBER):
           Regular Semi-Annual Income per 1,000 units
           (each April and October):                         $   25.97
           Annual Income per 1,000 units:                    $   51.95
           RECORD DAY: 10th day of each month
           These figures are estimates on the business day before the
           initial date of desit; actual payments may vary.



       6.  WHAT ARE THE FUND'S FEES AND EXPENSES?
           This table shows the costs and expenses you may pay,
           directly or indirectly, when you invest in the Fund.
           INVESTOR FEES
           Maximum Sales Fee (Load) on new
           purchases (as a percentage of
           $1,000 invested)                                  2.90%
           You will pay an up-front sales fee of 1.00% as well as a
           deferred sales fee of $9.50 ($2.37 per 1,000 units
           quarterly). Employees of some of the Sponsors and their
           affiliates may pay a reduced sales fee of at least $5.00 per
           1,000 units.
           The maximum sales fee is reduced if you invest at least
           $100,000, as follows:



                                         YOUR MAXIMUM
                                            SALES FEE
                 IF YOU INVEST:              WILL BE:
           ---------------------------  -----------------
           $100,000 to $249,999                  2.65%
           $250,000 to $499,999                  2.40%
           $500,000 to $999,999                  2.15%
           $1,000,000 and over                   1.90%

           Maximum Exchange Fee                  1.90%


           ESTIMATED ANNUAL FUND OPERATING EXPENSES


                                                        AMOUNT
                                                      PER UNIT
                                                    -----------
                                                     $    0.52
           Trustee's Fee
                                                     $    0.41
           Portfolio Supervision,
           Bookkeeping and
           Administrative Fees
           (including updating
           expenses)
                                                     $    0.08
           Evaluator's Fee
                                                     $    0.15
           Other Operating Expenses
                                                    -----------
                                                     $    1.16
           TOTAL


           The Sponsors historically paid updating expenses.


       7.  IS THE FUND MANAGED?
           Unlike a mutual fund, the Fund is not managed and bonds are
           not sold because of market changes. Rather, experienced
           Defined Asset Funds financial analysts regularly review the
           bonds in the Fund. The Fund may sell a bond if certain
           adverse credit or other conditions exist.
       8.  HOW DO I BUY UNITS?
           The minimum investment is $250.
           You can buy units from any of the Sponsors and other
           broker-dealers. The Sponsors are listed later in this
           prospectus. Some banks may offer units for sale through
           special arrangements with the Sponsors, although certain
           legal restrictions may apply.
           UNIT PRICE PER 1,000 UNITS              $942.85
           (as of August 31, 1999)
           Unit price is based on the net asset value of the Fund plus
           the up-front sales fee. An amount equal to any principal
           cash, as well as net accrued but undistributed interest on
           the unit, is added to the unit price. An independent
           evaluator prices the bonds at 3:30 p.m. Eastern time every
           business day. Unit price changes every day with changes in
           the prices of the bonds in the Fund.
       9.  HOW DO I SELL UNITS?
           You may sell your units at any time to any Sponsor or the
           Trustee for the net asset value determined at the close of
           business don the date of sale, less any remaining deferred
           sales fee. You will not pay any other fee when you sell
           your units.
      10.  HOW ARE DISTRIBUTIONS MADE AND TAXED?
           The Fund pays income twice a year.
           In the opinion of bond counsel when each bond was issued,
           interest on the bonds in this Fund is generally 100% exempt
           from regular federal income tax. A portion of the income
           may also be exempt from state and local personal income
           taxes, depending on where you live.
           You will also receive principal payments if bonds are sold
           or called or mature, when the cash available is more than
           $10.00 per 1,000 units. You will be subject to tax on any
           gain realized by the Fund on the disposition of bonds.


                                       4
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      11.  WHAT OTHER SERVICES ARE AVAILABLE?
           REINVESTMENT
           You will receive your semi-annual income in cash unless you
           choose to compound your income by reinvesting at no sales
           fee in the Municipal Fund Investment Accumulation Program,
           Inc. This Program is an open-end mutual fund with a
           comparable investment objective. Income from this Program
           will generally be subject to state and local income taxes.
           For more complete information about the Program, including
           charges and fees, ask the Trustee for the Program's
           prospectus. Read it carefully before you invest. The
           Trustee must receive your written election to reinvest at
           least 10 days before the record day of an income payment.
           EXCHANGE PRIVILEGES
           You may exchange units of this Fund for units of certain
           other Defined Asset Funds. You may also exchange into this
           Fund from certain other funds. We charge a reduced sales
           fee on exchanges.

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    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS

<TABLE>
<CAPTION>

                                  EFFECTIVE
TAXABLE INCOME 1999*               % TAX                         TAX-FREE YIELD OF
  SINGLE RETURN    JOINT RETURN   BRACKET    3%     3.5%     4%     4.5%     5%     5.5%     6%     6.5%
                                                        IS EQUIVALENT TO A TAXABLE YIELD OF
- ----------------------------------------------------------------------------------------------------------
<S>        <C>    <C>       <C>      <C>       <C>    <C>      <C>    <C>      <C>    <C>      <C>     <C>
$      0- 25,750 $      0- 43,050   15.00     3.53   4.12     4.71   5.29     5.88   6.47     7.06    7.65
- ----------------------------------------------------------------------------------------------------------
$ 25,751- 62,450 $ 43,051-104,050   28.00     4.17   4.86     5.56   6.25     6.94   7.64     8.33    9.03
- ----------------------------------------------------------------------------------------------------------
$ 62,451-130,250 $104,051-158,550   31.00     4.35   5.07     5.80   6.52     7.25   7.97     8.70    9.42
- ----------------------------------------------------------------------------------------------------------
$130,251-283,150 $158,551-283,150   36.00     4.69   5.47     6.25   7.03     7.81   8.59     9.38   10.16
- ----------------------------------------------------------------------------------------------------------
OVER $283,151       OVER $283,151   39.60     4.97   5.79     6.62   7.45     8.28   9.11     9.93   10.76
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</TABLE>


To compare the yield of a taxable security with the yield of a federally
tax-free security, find your taxable income and read across. The table
incorporates 1999 federal income tax rates and assumes that all income would
otherwise be taxed at a U.S. investor's highest tax rate. Yield figures are for
example only.

*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase-out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state and local taxation. Consequently, investors are urged to consult their
own tax advisers in this regard.

                                       5
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT

INCOME TWICE A YEAR

The Fund will pay you regular income twice a year. Your income may vary because
of:
   o elimination of one or more bonds from the Fund's portfolio because of
     calls, redemptions or sales;
   o a change in the Fund's expenses; or
   o the failure by a bond's issuer to pay interest.

Changes in interest rates generally will not affect your income because the
portfolio is fixed.

Along with your income, you will receive your share of any available bond
principal.

RETURN FIGURES

We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.

Estimated Current Return equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):


 Estimated Annual                  Estimated
 Interest Income        -       Annual Expenses
- -------------------------------------------------
                   Unit Price


Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.

Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.

These return quotations are designed to be comparative rather than predictive.

RECORDS AND REPORTS

You will receive:
o a statement of income payments twice a year;
o a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
  amount of tax-exempt interest received during the year.

You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
o audited financial statements of the Fund.

You may inspect records of Fund transactions at the Trustee's office during
regular business hours.

                                       6
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THE RISKS YOU FACE

INTEREST RATE RISK

Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.

CALL RISK

Many bonds can be prepaid or 'called' by the issuer before their stated
maturity.

For example, an issuer might call its bonds if it no longer needs the money for
the original purpose or, during periods of falling interest rates, if the
issuer's bonds have a coupon higher than current market rates. If the bonds are
called, your income will decline and you may not be able to reinvest the money
you receive at as high a yield or as long a maturity. An early call at par of a
premium bond will reduce your return.

REDUCED DIVERSIFICATION RISK

If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.

LIQUIDITY RISK

The bonds will generally trade in the over-the-counter market. We cannot assure
you that a liquid trading market will exist, especially since current law may
restrict the Fund from selling bonds to any Sponsor. The value of the bonds, and
of your investment, may be reduced if trading in bonds is limited or absent.

CONCENTRATION RISK

When a certain type of bond makes up 25% or more of the portfolio, the Fund is
said to be 'concentrated' in that bond type, which makes the Fund less
diversified.

Here is what you should know about the Fund's concentration in
university/college bonds. Payment for these bonds depends on:
   o level or amount and diversity of revenue sources;
   o availability of endowments and other funds;
   o enrollment;
   o financial management;
   o reputation; and
   o for public institutions, the financial condition of the government and its
      educational policies.

Here is what you should know about the Fund's concentration in hospital and
health care bonds:
   o payment for these bonds depends on revenues from private third-party payors
      and government programs, including Medicare and Medicaid, which have
      generally undertaken cost containment measures to limit payments to health
     care providers;
   o hospitals face increasing competition resulting from hospital mergers and
      affiliations;
   o hospitals need to reduce costs as HMOs increase market penetration and
     hospital supply and drug companies raise prices; and
   o hospitals and health care providers are subject to various legal claims by
     patients and others and are adversely affected by increasing costs of
     insurance.
   o many hospitals are aggressively buying physician practices and assuming
     risk contracts to gain market share. If revenues

                                       7
<PAGE>
      do not increase accordingly, this practice could reduce profits.
   o Medicare is changing its reimbursement system for nursing homes. Many
     nursing home providers are not sure how they will be treated. In many
     cases, the providers may receive lower reimbursements and these would have
     to cut expenses to maintain profitability.
   o most retirement/nursing home providers rely on entrance fees for operating
     revenues. If people live longer than expected and turnover is lower than
     budgeted, operating revenues would be adversely affected by less than
     expected entrance fees.

Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentration over time.

BOND QUALITY RISK

A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.

INSURANCE RELATED RISK

Some bonds are backed by insurance companies (as shown under Portfolio).
Insurance policies generally make payments only according to a bond's original
payment schedule and do not make early payments when a bond defaults or becomes
taxable. Although the federal government does not regulate the insurance
business, various state laws and federal initiatives and tax law changes could
significantly affect the insurance business. The claims-paying ability of the
insurance companies is generally rated A or better by Standard & Poor's or
another nationally recognized rating organization. The insurance company ratings
are subject to change at any time at the discretion of the rating agencies.

LITIGATION AND LEGISLATION RISKS

We do not know of any pending litigation that might have a material adverse
effect upon the Fund.

Future tax legislation could affect the value of the portfolio by:
   o limiting real property taxes,
   o reducing tax rates,
   o imposing a flat or other form of tax, or
   o exempting investment income from tax.

SELLING OR EXCHANGING UNITS

You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
   o adding the value of the bonds, net accrued interest, cash and any other
     Fund assets;
   o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
     advances, cash held to buy back units or for distribution to investors and
     any other Fund liabilities; and
   o dividing the result by the number of outstanding units.

Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.

If you sell your units before the final deferred sales fee installment, the
amount of any remaining installments will be deducted from your proceeds.

SPONSORS' SECONDARY MARKET

While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge other than any remaining deferred sales charge.
We may resell the units to other buyers or to the Trustee. You should consult
your financial professional for current market prices to determine if other
broker-dealers or banks are offering higher prices.

                                       8
<PAGE>
We may discontinue the secondary market without prior notice for any business
reason.

SELLING UNITS TO THE TRUSTEE

Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.

Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.

As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee may sell your units in the over-the-counter market for a
higher price, but the Trustee is not required to do so. In that case, you will
receive the net proceeds of the sale.

If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.

If you acquire 25% or more of the outstanding units of the Fund and you sell
units with a value exceeding $250,000, the Trustee may choose to pay you 'in
kind' by distributing bonds and cash with a total value equal to the price of
those units. The Trustee will try to distribute bonds in the portfolio pro rata,
but it reserves the right to distribute only one or a few bonds. The Trustee
will act as your agent in an in kind distribution and will either hold the bonds
for your account or sell them as you instruct. You must pay any transaction
costs as well as transfer and ongoing custodial fees on sales of bonds
distributed in kind.

There could be a delay in paying you for your units:
   o if the New York Stock Exchange is closed (other than customary weekend and
     holiday closings);
   o if the SEC determines that trading on the New York Stock Exchange is
     restricted or that an emergency exists making sale or evaluation of the
     bonds not reasonably practicable; and
   o for any other period permitted by SEC order.

EXCHANGE OPTION

You may exchange units of certain Defined Asset Funds for units of this Fund at
a maximum exchange fee of 1.90%. You may exchange units of this Fund for units
of certain other Defined Asset Funds at a reduced sales fee if your investment
goals change. To exchange units, you should talk to your financial professional
about what funds are exchangeable, suitable and currently available.

Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.

We may amend or terminate this exchange option at any time without notice.

                                       9
<PAGE>
HOW THE FUND WORKS

PRICING

The price of a unit includes interest accrued on the bonds, less expenses, from
the initial date of deposit up to, but not including, the settlement date, which
is usually three business days after the purchase date of the unit.

Bonds also carry accrued but unpaid interest up to the initial date of deposit.
To avoid having you pay this additional accrued interest (which earns no return)
when you buy, the Trustee advances this amount to the Sponsors. The Trustee
recovers this advance from interest received on the bonds.

In addition, a portion of the price of a unit also consists of cash to pay all
or some of the costs of organizing the Fund including:
   o cost of initial preparation of legal documents;
   o federal and state registration fees;
   o initial fees and expenses of the Trustee;
   o initial audit; and
   o legal expenses and other out-of-pocket expenses.

EVALUATIONS

An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.

INCOME

Interest on any bonds purchased on a when-issued basis or for a delayed delivery
does not begin to accrue until the bonds are delivered to the Fund. The Trustee
may reduce its fee to provide you with tax-exempt income for this non-accrual
period. If a bond is not delivered on time and the Trustee's annual fee and
expenses do not cover the additional accrued interest, we will treat the
contract to buy the bond as failed.

The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.

EXPENSES

The Trustee is paid monthly. It also benefits when it holds cash for the Fund in
non-interest bearing accounts. The Trustee may also receive additional amounts:
   o to reimburse the Trustee for the Fund's operating expenses;
   o for extraordinary services and costs of indemnifying the Trustee and the
     Sponsors;
   o costs of actions taken to protect the Fund and other legal fees and
     expenses;
   o expenses for keeping the Fund's registration statement current; and
   o Fund termination expenses and any governmental charges.

The Sponsors are currently reimbursed up to 55 cents per $1,000 face amount
annually for providing portfolio supervisory, bookkeeping and administrative
services and for any other expenses properly chargeable to the Fund. Legal,
typesetting, electronic filing and regulatory filing fees and expenses
associated with updating the Portfolio's registration statement yearly are also
now chargeable to the Portfolio. While this fee may exceed the amount of these
costs and

                                       10
<PAGE>
expenses attributable to this Fund, the total of these fees for all Series of
Defined Asset Funds will not exceed the aggregate amount attributable to all of
these Series for any calendar year. The Fund also pays the Evaluator's fees.
Certain of these expenses were previously paid for by the Sponsors.

The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.

Quarterly deferred sales charges you owe are paid with interest and principal
from certain bonds. If these amounts are not enough, the rest will be paid out
of distributions to you from the Fund's Capital and Income Accounts.

The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.

PORTFOLIO CHANGES

The Sponsors and Trustee are not liable for any default or defect in a bond.

Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.

If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.

We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
   o diversity of the portfolio;
   o size of the Fund relative to its original size;
   o ratio of Fund expenses to income;
   o current and long-term returns;
   o degree to which units may be selling at a premium over par; and
   o cost of maintaining a current prospectus.

FUND TERMINATION

The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds deposited. We will decide whether to
terminate the Fund early based on the same factors used in deciding whether or
not to offer units in the secondary market.

When the Fund is about to terminate you will receive a notice, and you will be
unable to sell your units after that time. On or shortly before termination, we
will sell any remaining bonds, and you will receive your final distribution. Any
bond that cannot be sold at a reasonable price may continue to be held by the
Trustee in a liquidating trust pending its final sale.

You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.

CERTIFICATES

Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.

                                       11
<PAGE>
TRUST INDENTURE

The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.

The Sponsors and the Trustee may amend the Indenture without your consent:
   o to cure ambiguities;
   o to correct or supplement any defective or inconsistent provision;
   o to make any amendment required by any governmental agency; or
   o to make other changes determined not to be materially adverse to your best
     interest (as determined by the Sponsors).

Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.

The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
   o it fails to perform its duties and the Sponsors determine that its
     replacement is in your best interest; or
   o it becomes incapable of acting or bankrupt or its affairs are taken over by
     public authorities.

Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.

Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
   o remove it and appoint a replacement Sponsor;
   o liquidate the Fund; or
   o continue to act as Trustee without a Sponsor.

Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.

The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.

LEGAL OPINION

Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.

AUDITORS

Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.

SPONSORS

The Sponsors are:
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051
SALOMON SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of Citigroup
Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013

                                       12
<PAGE>
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019

Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.

TRUSTEE

The Bank of New York, 101 Barclay Street-- 17W, New York, New York 10268, is the
Trustee. It is supervised by the Federal Deposit Insurance Corporation, the
Board of Governors of the Federal Reserve System and New York State banking
authorities.

UNDERWRITERS' AND SPONSORS' PROFITS

Underwriters receive sales charges when they sell units. Any cash made available
by you to the Sponsors before the settlement date for those units may be used in
the Sponsors' businesses to the extent permitted by federal law and may benefit
the Sponsors.

A Sponsor or Underwriter may have realized profits or sustain losses on bonds in
the Fund which were acquired from underwriting syndicates of which it was a
member.

In maintaining a secondary market, the Sponsors will also realize profits or
sustain losses in the amount of any difference between the prices at which they
buy units and the prices at which they resell or redeem them.

PUBLIC DISTRIBUTION

The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.

CODE OF ETHICS

Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.

YEAR 2000 ISSUES

Many computer systems were designed in such a way that they may be unable to
distinguish between the year 2000 and the year 1900 (commonly known as the 'Year
2000 Problem'). We do not expect that the computer system changes necessary to
prepare for the Year 2000 will cause any major operational difficulties for the
Fund. The Year 2000 Problem may adversely affect the issuers of the bonds
contained in the Portfolio, but we cannot predict whether any impact will be
material to the Fund as a whole.

TAXES

The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances or subject to
special rules. You should consult your own tax adviser about your particular
circumstances.

At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular

                                       13
<PAGE>
federal income tax. However, interest may be subject to state and local taxes
and may be taken into account in determining your preference items for
Alternative Minimum Tax purposes. Neither we nor our counsel have reviewed the
issuance of the bonds, related proceedings or the basis for the opinions of
counsel for the issuers. We cannot assure you that the issuer (or other users)
have complied or will comply with any requirements necessary for a bond to be
tax-exempt. If any of the bonds were determined not to be tax-exempt, you could
be required to pay income tax for current and prior years, and if the Fund were
to sell the bond, it might have to sell it at a substantial discount.

In the opinion of our counsel, under existing law:

GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT

The Fund will not be taxed as a corporation for federal income tax purposes, and
you will be considered to own directly your share of each bond in the Fund.

GAIN OR LOSS UPON DISPOSITION

When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. Your gain, however,
will generally be ordinary income to the extent of any accrued 'market
discount'. Generally you will have market discount to the extent that your basis
in a bond when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount bond, the issue price
increased by original issue discount that has accrued on the bond before your
purchase). You should consult your tax adviser in this regard.

If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each bond for more than one year and short-term otherwise. If
you are an individual and sell your units after holding them for more than 12
months, you may be entitled to a 20% maximum federal tax rate on any resulting
gains. Consult your tax adviser in this regard. Because the deductibility of
capital losses is subject to limitations, you may not be able to deduct all of
your capital losses.

YOUR BASIS IN THE BONDS

Your aggregate basis in the bonds will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount,' 'acquisition premium' and
'bond premium'. You should consult your tax adviser in this regard.

EXPENSES

If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.

STATE AND LOCAL TAXES

Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.

                                       14
<PAGE>
SUPPLEMENTAL INFORMATION

You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolio, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.

                                       15
<PAGE>
MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS


REPORT OF INDEPENDENT ACCOUNTANTS


The Sponsors, Trustee and Holders
  of Municipal Defined Fund,
  Series - 3,
  Defined Asset Funds:

We have audited the accompanying statement of condition of Municipal
Defined Fund, Series - 3, Defined Asset Funds, including the
portfolio, as of August 31, 1999 and the related statements of
operations and of changes in net assets for the period September 24,
1998 to August 31, 1999. These financial statements are the
responsibility of the Trustee. Our responsibility is to express an
opinion on these financial statements based on our audit.

We conducted our audit in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit
to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the
financial statements. Securities owned at August 31, 1999, as shown in
such portfolio, were confirmed to us by The Bank of New York, the
Trustee. An audit also includes assessing the accounting principles
used and significant estimates made by the Trustee, as well as
evaluating the overall financial statement presentation. We believe
that our audit provides a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Municipal
Defined Fund, Series - 3, Defined Asset Funds at August 31, 1999 and
the results of its operations and changes in its net assets for the
above-stated period in conformity with generally accepted accounting
principles.


DELOITTE & TOUCHE LLP

New York, N.Y.
November 24, 1999



                                                   D - 1
<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

STATEMENT OF CONDITION
AS OF AUGUST 31, 1999

<TABLE>
<S>                                                <C>           <C>
TRUST PROPERTY:
  Investment in marketable securities - at value
    (cost $15,229,655)(Note 1).....................                 $13,792,512
  Accrued interest receivable......................                     180,640
  Accrued interest receivable on segregated bonds..                       7,980
  Cash.............................................                     128,112
                                                                   _____________

              Total trust property.................                  14,109,244

LESS LIABILITIES:
  Deferred sales charge (Note 5)...................  $   100,501
  Redemptions payable..............................      107,827
  Accrued expenses.................................        5,680        214,008
                                                    _____________  _____________

NET ASSETS, REPRESENTED BY:
  14,883,586 units of fractional undivided
    interest outstanding (Note 3)..................   13,593,656
  Undistributed net investment income..............      301,580
                                                    _____________
                                                                    $13,895,236
                                                                   =============
UNIT VALUE ($13,895,236/14,883,586 units)..........                    $0.93359
                                                                   =============


</TABLE>
                         See Notes to Financial Statements.


                                                   D - 2
<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                             September 24,
                                                 1998
                                                  to
                                              August 31,
                                                 1999
                                             _____________
<S>                                        <C>
INVESTMENT INCOME:
  Interest income...........................  $  742,667
  Interest income on segregated bonds.......      14,985
  Trustee's fees and expenses...............      (6,884)
  Sponsors' fees............................      (5,286)
                                             _____________
  Net investment income.....................     745,482
                                             _____________

  Net realized and unrealized loss on
    investments.............................  (1,437,143)
                                             _____________

NET DECREASE IN NET ASSETS RESULTING
  FROM OPERATIONS...........................  $ (691,661)
                                             =============


</TABLE>
             See Notes to Financial Statements.


                                                   D - 3
<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                               September 24,
                                                   1998
                                                    to
                                                August 31,
                                                   1999
                                               _____________
<S>                                          <C>
OPERATIONS:
  Net investment income....................... $   745,482
  Unrealized depreciation of investments......  (1,437,143)
                                               _____________
  Net decrease in net assets resulting
    from operations...........................    (691,661)
                                               _____________
INCOME DISTRIBUTIONS TO HOLDERS (Note 2)......    (426,450)

DEFERRED SALES CHARGE (NOTE 5)................    (108,481)

CAPITAL SHARE TRANSACTIONS - Redemptions of
  116,414 units...............................    (107,827)
                                               _____________
NET DECREASE IN NET ASSETS....................  (1,334,419)

NET ASSETS AT BEGINNING OF PERIOD.............  15,229,655
                                               _____________
NET ASSETS AT END OF PERIOD................... $13,895,236
                                               =============
PER UNIT:
  Income distributions during period..........    $0.02843
                                               =============
  Net asset value at end of period............    $0.93359
                                               =============
TRUST UNITS OUTSTANDING AT END OF PERIOD......  14,883,586
                                               =============
</TABLE>
             See Notes to Financial Statements.


                                                   D - 4
<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS


NOTES TO FINANCIAL STATEMENTS


  1.  SIGNIFICANT ACCOUNTING POLICIES

      The Fund is registered under the Investment Company Act of 1940 as
      a Unit Investment Trust. The following is a summary of significant
      accounting policies consistently followed by the Fund in the
      preparation of its financial statements. The policies are in
      conformity with generally accepted accounting principles.

      (a) Securities are stated at value as determined by the Evaluator
          based on bid side evaluations for the securities, except that value
          on September 24, 1998 was based upon offer side evaluations at
          September 22, 1998 the day prior to the Date of Deposit. Cost of
          securities at September 24, 1998, was also based on such offer side
          evaluations.

      (b) The Fund is not subject to income taxes. Accordingly, no
          provision for such taxes is required.

      (c) Interest income is recorded as earned.

  2.  DISTRIBUTIONS

      A distribution of net investment income is made to Holders each
      month. Receipts other than interest, after deductions for
      redemptions and applicable expenses, are also distributed
      periodically.

  3.  NET CAPITAL
<TABLE>
     <S>                                                      <C>
      Cost of 14,883,586 units at Date of Deposit.........   $15,111,458
      Redemptions of units - net cost of 116,414 units
        redeemed less redemption amounts..................        12,837
      Interest income on segregated bonds.................        14,985
      Deferred sales charge...............................      (108,481)
      Unrealized depreciation of investments..............    (1,437,143)
                                                           ______________

      Net capital applicable to Holders...................   $13,593,656
                                                           ==============
</TABLE>

  4.  INCOME TAXES

      As of August 31, 1999, unrealized depreciation of investments, based
      on cost for Federal income tax purposes, aggregated $1,437,143, all of
      which related to depreciated securities. The cost of investment
      securities for Federal income tax purposes was $15,229,655 at
      August 31, 1999.



                                                   D - 5
<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS


NOTES TO FINANCIAL STATEMENTS

  5.  DEFERRED SALES CHARGE

      A deferred sales fee of $19.00 per 1,000 units is payable over a two-
      year period.  ($2.38 per 1,000 units quarterly in the first year and
      $2.37 per 1,000 units quarterly in the second year).

                                                   D - 6

<PAGE>


MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

PORTFOLIO
AS OF AUGUST 31, 1999

<TABLE>
<CAPTION>

                                          Rating                                      Optional
    Portfolio No. and Title of            of              Face                        Redemption
            Securities                   Issues(1)       Amount  Coupon Maturities(3) Provisions(3)       Cost(2)      Value(2)
            __________                   _________       ______  ______ _____________ _____________       _______      ________
 <S>                                   <C>       <C>          <C>       <C>      <C>             <C>               <C>
 1 Pocahontas Pkwy. Assoc., VA, Route      A        $ 1,125,000   5.500%   2028       08/15/08       $  1,154,599     1,036,586
   895 Connector, Toll Road Rev. Bonds                                                @ 102.000
   (ACA Ins.) (4)

 2 Washington Conv. Ctr. Auth.,            AAA        1,125,000   4.750    2028       10/01/08          1,064,790       944,719
   Washington D.C., Sr. Lien Dedicated                                                @ 100.000
   Tax Rev. Bonds, Ser. 1998
   (AMBAC Ins.) (4)

 3 Town of Johnson, RI, G.O. Capital       AA         1,000,000   5.250    2018       08/15/08          1,004,330       922,110
   Imp. Bonds, Ser. 1998 B (Asset                                                     @ 102.000
   Guaranty Ins.) (4)

 4 Pell Lake Sanitary Dist. No. 1, WI,     NR           305,000   5.600    2018       09/01/08            310,807       284,800
   G.O. Corp. Purpose Bonds                                                           @ 100.000

 5 Illinois Hlth. Fac. Auth., Rev.         A-         1,125,000   5.750    2027       08/15/07          1,176,761     1,022,220
   Bonds (Victory Hlth. Svcs.),                                                       @ 101.000
   Ser. 1997 A

 6 Duluth Econ. Dev. Auth., MN, Hlth.      NR           125,000   5.875    2028       06/01/05            127,328       115,967
   Care Facs. Rev. Bonds (BSM                                                         @ 102.000
   Properties, Inc. Proj.), Ser.           NR           185,000   5.625    2018       06/01/05            187,840       171,650
   1998 A                                                                             @ 102.000

 7 Madison Cnty., MO, Hosp. Rfdg.          NR           185,000   5.750    2018       10/01/08            189,845       174,566
   Rev. Bonds, Ser. 1998                                                              @ 101.000
                                                        355,000   5.875    2026       10/01/08            363,452       330,285
                                                                                      @ 101.000

 8 North Carolina Med. Care Comm.,         A            400,000   5.000    2024       08/15/08            383,176       346,712
   Hosp. Rev. Bonds, (Halifax Regl.                                                   @ 101.000
   Med. Ctr.), Ser. 1998                                625,000   5.000    2018       08/15/08            605,813       558,687
                                                                                      @ 101.000

 9 City of Franklin, OH, Hlth. Care        A            250,000   5.375    2028       08/15/08            251,623       230,902
   Fcs. Rev. Rfdg. and Imp. Bonds                                                     @ 101.000
   (Friendship Village of Columbus
   Ohio, Inc. Proj.), Ser. 1998
   (ACA Ins.) (4)

</TABLE>


                                                                 D - 7

<PAGE>

MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

PORTFOLIO
AS OF AUGUST 31, 1999

<TABLE>
<CAPTION>

                                          Rating                                      Optional
    Portfolio No. and Title of            of              Face                        Redemption
            Securities                   Issues(1)       Amount  Coupon Maturities(3) Provisions(3)       Cost(2)      Value(2)
            __________                   _________       ______  ______ _____________ _____________       _______      ________
 <S>                                   <C>       <C>          <C>       <C>      <C>             <C>               <C>
10 City of Franklin, OH, Hlth. Care        NR       $   750,000   5.500%   2021       07/01/08        $   750,000   $   687,578
   Facs. Rfdg. Rev. Bonds (Ohio                                                       @ 101.000
   Presbyterian Retirement Svcs.),
   Ser. 1997

11 Berks Cnty. Mun. Auth., PA, Hlth.       AA-          395,000   5.000    2028       09/01/08            383,146       344,768
   Care Rev. Bonds (Pooled Financing                                                  @ 101.000
   Proj.), Ser. 1998

12 City of Kansas City, MO, Sewerage       AA-          160,000   5.600    2000       None                164,451       161,554
   Sys. Rfdg. and Imp. Rev. Bonds,
   Ser. 1992 (5)

13 Southern Iowa Rural Wtr.                AA         1,095,000   5.000    2032       12/01/08          1,060,080       913,854
   Association, Wtr. Rev. Cap. Loan                                                   @ 100.000
   Rfdg. Notes, Ser. 1998
   (Asset Guaranty Ins.) (4)

14 West Virgina Wtr. Dev. Auth., Wtr.      AAA          765,000   5.250    2035       11/01/05            767,700       697,290
   Dev. Rev. Bonds (Loan Program II),                                                 @ 102.000
   Ser. 1995 B (FSA Ins.) (4)

15 Minneapolis Cmnty. Dev. Agy., MN,       AAA          100,000   7.000    2001       None                107,633       104,093
   Tax Increment Rev. Bonds, Ser.
   1990 (MBIA Ins.) (4) (5)

16 Intermountain Pwr. Agy., UT, Pwr.       A+         1,100,000   5.000    2021       07/01/06          1,077,934       992,992
   Supply Rev. Rfdg. Bonds, Ser.                                                      @ 102.000
   1996 D

17 Illinois Educl. Fac. Auth., Rev.        A          1,125,000   5.500    2028       05/15/08          1,139,400     1,046,869
   Bonds (Midwestern Univ.), Ser. 1998                                                @ 101.000
   B (ACA Ins.) (4)

18 Massachusetts Indl. Fin. Agy., Rev.     AAA          250,000   4.750    2028       10/01/08            238,465       210,545
   Bonds, Babson College Issue, Ser.                                                  @ 101.000
   1998 A (MBIA Ins.) (4)

</TABLE>

                                                                 D - 8

<PAGE>


MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS

PORTFOLIO
AS OF AUGUST 31, 1999

<TABLE>
<CAPTION>

                                          Rating                                      Optional
    Portfolio No. and Title of            of              Face                        Redemption
            Securities                   Issues(1)       Amount  Coupon Maturities(3) Provisions(3)       Cost(2)      Value(2)
            __________                   _________       ______  ______ _____________ _____________       _______      ________
 <S>                                   <C>       <C>          <C>       <C>      <C>             <C>               <C>
19 New Jersey Educl. Fac. Auth.,           NR       $   750,000   5.700%   2028       07/01/08        $   756,330   $   702,225
   Rev. Bonds (Fairleigh Dickinson                                                    @ 101.000
   Univ. Issue), Ser. 1998 G

20 Pennsylvania Higher Educl. Facs.        AAA          250,000   5.375    2023       04/01/08            253,753       232,485
   Auth., Coll. Rev. Bonds (Geneva                                                    @ 102.000
   College), Ser. 1998 (ACA Ins.) (4)

21 Skagit Valley Coll. Foundation, WA,     NR           215,000   5.625    2017       11/01/08            217,879       198,970
   Stud. Hsg. Rev. and Rfdg. Bonds,                                                   @ 100.000
   Ser. 1998                                            500,000   5.500    2013       11/01/08            503,820       470,415
                                                                                      @ 100.000

22 Wisconsin Hlth. and Educl. Fac.         A3(m)      1,000,000   5.125    2028       10/15/08            988,700       889,670
   Auth., Rev. Bonds (Laurence Univ.                                                  @ 101.000
   of Wisconsin), Ser. 1998

                                                   ______________                                   ______________ ______________
TOTAL                                               $15,260,000                                       $15,229,655   $13,792,512
                                                   ==============                                   ============== ==============


</TABLE>

        See Notes to Portfolio.


                                                                 D - 9


<PAGE>




MUNICIPAL DEFINED FUND,
SERIES - 3,
DEFINED ASSET FUNDS


NOTES TO PORTFOLIO
AS OF AUGUST 31, 1999

   (1) The ratings of the bonds are by Standard & Poor's Ratings
       Group, or by Moody's Investors Service, Inc. if followed by
       "(m)", or by Fitch Investors Service, Inc. if followed by
       "(f)"; "NR" indicates that this bond is not currently rated by
       any of the above-mentioned rating services. These ratings have
       been furnished by the Evaluator but not confirmed with
       the rating agencies.

   (2) See Notes to Financial Statements.

   (3) Optional redemption provisions, which may be exercised in whole
       or in part, are initially at prices of par plus a premium, then
       subsequently at prices declining to par. Certain securities may
       provide for redemption at par prior or in addition to any
       optional or mandatory redemption dates or maturity, for
       example, through the operation of a maintenance and replacement
       fund, if proceeds are not able to be used as contemplated, the
       project is condemned or sold or the project is destroyed and
       insurance proceeds are used to redeem the securities. Many of
       the securities are also subject to mandatory sinking fund
       redemption commencing on dates which may be prior to the date
       on which securities may be optionally redeemed. Sinking fund
       redemptions are at par and redeem only part of the issue. Some
       of the securities have mandatory sinking funds which contain
       optional provisions permitting the issuer to increase the
       principal amount of securities called on a mandatory redemption
       date. The sinking fund redemptions with optional provisions
       may, and optional refunding redemptions generally will, occur
       at times when the redeemed securities have an offering side
       evaluation which represents a premium over par. To the extent
       that the securities were acquired at a price higher than the
       redemption price, this will represent a loss of capital when
       compared with the Public Offering Price of the Units when
       acquired. Distributions will generally be reduced by the amount
       of the income which would otherwise have been paid with respect
       to redeemed securities and there will be distributed to Holders
       any principal amount and premium received on such redemption
       after satisfying any redemption requests for Units received by
       the Fund. The estimated current return may be affected by
       redemptions.

   (4) Insured by the indicated municipal bond insurance company.

   (5) It is anticipated that interest and principal received from
       these bonds will be applied to the payment of the Trust's
       deferred sales charges.


                                                   D - 10


                             Defined
                             Asset FundsSM


HAVE QUESTIONS ?                         MUNICIPAL DEFINED FUND--3
Request the most                         (A Unit Investment Trust)
recent free Information                  ---------------------------------------
Supplement that gives more               This Prospectus does not contain
details about the Fund,                  complete information about the
by calling:                              investment company filed with the
The Bank of New York                     Securities and Exchange Commission in
1-800-221-7771                           Washington, D.C. under the:
                                         o Securities Act of 1933 (file no.
                                         333-62637) and
                                         o Investment Company Act of 1940 (file
                                         no. 811-2537).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         Units of any future series may not be
                                         sold nor may offers to buy be accepted
                                         until that series has become effective
                                         with the Securities and Exchange
                                         Commission. No units can be sold in any
                                         State where a sale would be illegal.


                                                     70126--12/99
<PAGE>
                             DEFINED ASSET FUNDS--
                             MUNICIPAL DEFINED FUND
                       CONTENTS OF REGISTRATION STATEMENT

     This Post-Effective Amendment to the Registration Statement on Form S-6
comprises the following papers and documents:

     The facing sheet of Form S-6.

     The cross-reference sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Insured
Series, 1933 Act File No. 33-54565).

     The Prospectus.

     The Signatures.

The following exhibits:

     1.1.1--Form of Standard Terms and Conditions of Trust Effective as of
            October 21, 1993 (incorporated by reference to Exhibit 1.1.1 to the
            Registration Statement of Municipal Investment Trust Fund,
            Multi-state Series--48, 1933 Act File No. 33-50247).

     4.1  --Consent of the Evaluator.

     5.1  --Consent of independent accountants.

     9.1  --Information Supplement (incorporated by reference to Exhibit 9.1 to
            Amendment No. 4 to the Registration Statement of Municipal
            Investment Trust Fund, Multistate Series--409, 1933 Act File No.
         333-81777).

                                      R-1
<PAGE>
                             DEFINED ASSET FUNDS--
                           MUNICIPAL DEFINED FUND--3

                                   SIGNATURES

     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT,
DEFINED ASSET FUNDS--MUNICIPAL DEFINED FUND--3, CERTIFIES THAT IT MEETS ALL OF
THE REQUIREMENTS FOR EFFECTIVENESS OF THIS REGISTRATION STATEMENT PURSUANT TO
RULE 485(B) UNDER THE SECURITIES ACT OF 1933 AND HAS DULY CAUSED THIS
REGISTRATION STATEMENT OR AMENDMENT TO THE REGISTRATION STATEMENT TO BE SIGNED
ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY AUTHORIZED IN THE CITY OF NEW
YORK AND STATE OF NEW YORK ON THE 1ST DAY OF DECEMBER, 1999.

               SIGNATURES APPEAR ON PAGES R-3, R-4, R-5 AND R-6.

     A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

     A majority of the members of the Board of Directors of Salomon Smith Barney
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

     A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.

     A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.

                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR


By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              Number: 333-70593


      GEORGE A. SCHIEREN
      JOHN L. STEFFENS
      By J. DAVID MEGLEN
       (As authorized signatory for Merrill Lynch, Pierce,
       Fenner & Smith Incorporated and
       Attorney-in-fact for the persons listed above)

                                      R-3
<PAGE>
                           SALOMON SMITH BARNEY INC.
                                   DEPOSITOR


By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Salomon Smith Barney Inc.:        have been filed
                                                              under the 1933 Act
                                                              File Numbers:
                                                              333-63417 and
                                                              333-63033


      MICHAEL A. CARPENTER
      DERYCK C. MAUGHAN

      By GINA LEMON
       (As authorized signatory for
       Salomon Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)

                                      R-4
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR


By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 33-55073


      MARGO N. ALEXANDER
      TERRY L. ATKINSON
      BRIAN M. BAREFOOT
      STEVEN P. BAUM
      MICHAEL CULP
      REGINA A. DOLAN
      JOSEPH J. GRANO, JR.
      EDWARD M. KERSCHNER
      JAMES P. MacGILVRAY
      DONALD B. MARRON
      ROBERT H. SILVER
      MARK B. SUTTON
      By
       ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)

                                      R-5
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR


By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085,
  Reynolds Inc.:                            333-13039 and 333-47553


      RICHARD M. DeMARTINI
      RAYMOND J. DROP
      JAMES F. HIGGINS
      MITCHELL M. MERIN
      STEPHEN R. MILLER
      PHILIP J. PURCELL
      THOMAS C. SCHNEIDER
      By
       MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)

                                      R-6

<PAGE>
                                                                     EXHIBIT 4.1

                               STANDARD & POOR'S
                    A DIVISION OF THE McGRAW-HILL COMPANIES
                                  J. J. KENNY
                                  65 BROADWAY
                           NEW YORK, N.Y. 10006-2551
                            TELEPHONE (212) 770-4422
                                FAX 212/797-8681

                                                   December 1, 1999

Frank A. Ciccotto, Jr.
Vice President
Tax-Exempt Evaluations


Merrill Lynch, Pierce, Fenner & Smith
Incorporated
Defined Asset Funds
P.O. Box 9051
Princeton, New Jersey 08543-9051
The Bank of New York
101 Barclay Street
New York, New York 10286


RE: DEFINED ASSET FUNDS--MUNICIPAL DEFINED FUND--3

Gentlemen:

     We have examined the post-effective Amendment to the Registration Statement
File No. 333-62637 for the above-captioned trust. We hereby acknowledge that
Kenny S&P Evaluation Services, a division of J. J. Kenny Co., Inc. is currently
acting as the evaluator for the trust. We hereby consent to the use in the
Amendment of the reference to Kenny S&P Evaluation Services, a division of J. J.
Kenny Co., Inc. as evaluator.

     In addition, we hereby confirm that the ratings indicated in the
above-referenced Amendment to the Registration Statement for the respective
bonds comprising the trust portfolio are the ratings currently indicated in our
KENNYBASE database.

     You are hereby authorized to file copies of this letter with the Securities
and Exchange Commission.

                                                   Sincerely,
                                                   FRANK A. CICCOTTO
                                                   Vice President

<PAGE>
                                                                     Exhibit 5.1
                       CONSENT OF INDEPENDENT ACCOUNTANTS
The Sponsors and Trustee of
Municipal Defined Fund--3, Defined Asset Funds

We consent to the use in this Post-Effective Amendment No. 1 to Registration
Statement No. 333-62637 of our opinion dated November 24, 1999 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading 'Auditors' in such Prospectus.

DELOITTE & TOUCHE LLP
New York, N.Y.
December 1, 1999


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