DEFINED ASSET FUNDS MUNICIPAL DEFINED FUND SERIES 6
497, 2000-04-03
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                           DEFINED ASSET FUNDS--REGISTERED TRADEMARK--
                           ----------------------------------------------------

                           MUNICIPAL DEFINED FUND--6
                           (A UNIT INVESTMENT TRUST)
                           -  PORTFOLIO OF INSURED LONG TERM MUNICIPAL BONDS
                           -  DESIGNED TO BE FREE OF REGULAR FEDERAL INCOME TAX
                           -  DISTRIBUTIONS TWICE A YEAR

SPONSORS:
MERRILL LYNCH,             -----------------------------------------------------
PIERCE, FENNER & SMITH     The Securities and Exchange Commission has not
INCORPORATED               approved or disapproved these Securities or passed
SALOMON SMITH BARNEY INC.  upon the adequacy of this prospectus. Any
PAINEWEBBER INCORPORATED   representation to the contrary is a criminal offense.
DEAN WITTER REYNOLDS INC.  Prospectus dated March 31, 2000.

<PAGE>
- --------------------------------------------------------------------------------

Defined Asset Funds--Registered Trademark--
Defined Asset Funds-Registered Trademark- 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:
  - A disciplined strategy of buying and holding with a long-term view is the
    cornerstone of Defined Asset Funds.
  - Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
    funds are not managed and portfolio changes are limited.
  - Defined Portfolios: We choose the stocks and bonds in advance, so you know
    what you're investing in.
  - Professional research: Our dedicated research team seeks out stocks or bonds
    appropriate for a particular fund's objectives.
  - 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,
NOVEMBER 30, 1999.

<TABLE>
<S>                                    <C>
CONTENTS
                                       PAGE
                                       ----
Risk/Return Summary..................     3
What You Can Expect From Your
  Investment.........................     6
  Income Twice a Year................     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..........     8
  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.......................    12
  Trust Indenture....................    12
  Legal Opinion......................    13
  Auditors...........................    13
  Sponsors...........................    13
  Trustee............................    13
  Underwriters' and Sponsors'
    Profits..........................    13
  Public Distribution................    13
  Code of Ethics.....................    13
  Year 2000 Issues...................    14
  Taxes..............................    14
Supplemental Information.............    15
Financial Statements.................   D-1
</TABLE>

                                       2
<PAGE>
- --------------------------------------------------------------------------------

RISK/RETURN SUMMARY

<TABLE>
<C>  <S>
 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?
  -  The Fund plans to hold to maturity 19
     long-term tax-exempt municipal bonds,
     and some short-term bonds reserved to
     pay the deferred sales charge, with an
     aggregate face amount of $13,715,000.
     The Fund is a unit investment trust
     which means that, unlike a mutual fund,
     the Fund's portfolio is not managed.
  -  When initially deposited, the bonds were
     rated A or better by Standard & Poor's,
     Moody's or Fitch or in the opinion of
     the agent for the Sponsors had similar
     credit quality to other bonds in the
     portfolio. Credit quality could
     currently be lower.
  -  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.
  -  26% of the bonds are insured by
     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:
</TABLE>

<TABLE>
  -  Airports/Ports/Highways                  8%
<C>  <S>
  -  General Obligation                     14%
  -  Hospitals/Health Care                   44%
  -  Housing                                  2%
  -  Lease Rental                             9%
  -  Municipal Electric Utilities            8%
  -  Special Tax                              1%
  -  University/College                      12%
  -  Miscellaneous                            2%
</TABLE>

<TABLE>
<C>  <S>
 4.  WHAT ARE THE SIGNIFICANT RISKS?
     YOU CAN LOSE MONEY BY INVESTING IN THE
     FUND. THIS CAN HAPPEN FOR VARIOUS
     REASONS, INCLUDING:
  -  Rising interest rates, an issuer's
     worsening financial condition or a drop
     in bond ratings can reduce the price of
     your units.
  -  Because the Fund is concentrated in
     hospital/health care bonds, adverse
     developments in this industry may affect
     the value of your units.
  -  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.
  -  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.
</TABLE>

                                       3
<PAGE>

<TABLE>
<C>  <S>
     DEFINING YOUR INCOME
</TABLE>

<TABLE>
<C>  <S>                                           <C>
     WHAT YOU MAY EXPECT (RECORD DAY: 10TH DAY OF
     EACH JULY AND JANUARY):
     Regular Semi-Annual Income per 1,000 units
     each July and January:                         $25.73
     Annual Income per 1,000 units:                 $51.46

     THESE FIGURES ARE ESTIMATES ON THE BUSINESS DAY BEFORE
     THE INITIAL DATE OF DESIT; ACTUAL PAYMENTS MAY VARY.
</TABLE>

<TABLE>
<C>  <S>
 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 1.714% as well
     as a total deferred sales fee of $11.86 per 1,000
     units (paid in quarterly installments May, August,
     November and February, through February, 2001).
     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:
</TABLE>

<TABLE>
<CAPTION>
                               YOUR MAXIMUM
                                SALES FEE
          IF YOU INVEST:         WILL BE:
          --------------       ------------
<C>  <S>                       <C>
     $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%
</TABLE>

<TABLE>
<C>  <S>
     ESTIMATED ANNUAL FUND OPERATING EXPENSES
</TABLE>

<TABLE>
<CAPTION>
                                                      AMOUNT
                                                  PER 1,000 UNITS
                                                  ---------------
<C>  <S>                                          <C>
                                                      $ 0.52
     Trustee's Fee
                                                      $ 0.40
     Portfolio Supervision,
     Bookkeeping and
     Administrative Fees
     (including updating
     expenses)
                                                      $ 0.09
     Evaluator's Fee
                                                      $ 0.19
     Other Operating Expenses
                                                      ------
                                                      $ 1.20
     TOTAL
</TABLE>

<TABLE>
<C>  <S>
     The Sponsors historically paid updating
     expenses.
</TABLE>

<TABLE>
<C>  <S>
 7.  HOW HAVE SIMILAR FUNDS PERFORMED IN THE
     PAST?

     IN THE FOLLOWING CHART WE SHOW PAST
     PERFORMANCE OF PRIOR MUNICIPAL INSURED
     SERIES, WHICH HAD SIMILAR INVESTMENT
     OBJECTIVES, STRATEGIES AND TYPES OF BONDS
     AS THIS FUND. These prior Insured Series
     were offered between January 5, 1988 and
     October 17, 1996 and were outstanding on
     December 31, 1999. OF COURSE, PAST
     PERFORMANCE OF PRIOR SERIES IS NO
     GUARANTEE OF FUTURE RESULTS OF THIS FUND.

     AVERAGE ANNUAL COMPOUND TOTAL RETURNS
     FOR PRIOR SERIES
     REFLECTING ALL EXPENSES. FOR PERIODS
     ENDED 12/31/99.
</TABLE>

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

<TABLE>
 High                    2.89%     6.77%     5.49%      3.07     7.97%     6.08%
 <S>                    <C>       <C>       <C>       <C>       <C>       <C>
 Average                 -4.66      5.23      5.24     -2.64      6.31      5.83
 Low                     -13.33     2.74      5.04     -10.59     3.60      5.63
</TABLE>

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

<TABLE>
 <S>                    <C>       <C>       <C>       <C>       <C>       <C>
 Average
 Sales fee               2.13%     5.32%     5.82%
</TABLE>

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

NOTE: ALL RETURNS REPRESENT CHANGES IN UNIT PRICE WITH DISTRIBUTIONS REINVESTED
 INTO THE MUNICIPAL FUND INVESTMENT ACCUMULATION PROGRAM.

<TABLE>
<C>  <S>
 8.  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.

 9.  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.
</TABLE>

                                       4
<PAGE>
<TABLE>
<C>  <S>
     UNIT PRICE PER 1,000 UNITS           $888.60
     (as of November 30, 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.

10.  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 on the date of sale, less any
     remaining deferred sales fee. You will not pay any
     other fee when you sell your units.

11.  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.

12.  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.
</TABLE>

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

<TABLE>
                                      EFFECTIVE
TAXABLE INCOME 2000*                  % TAX                                  TAX-FREE YIELD OF
  SINGLE RETURN      JOINT RETURN     BRACKET      3%        3.5%        4%        4.5%        5%        5.5%        6%
                                                                    IS EQUIVALENT TO A TAXABLE YIELD OF
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
- ---------------------------------------------------------------------------------------------------------------------------
$      0- 26,250   $      0- 43,850    15.00       3.53       4.12       4.71       5.29       5.88       6.47       7.06
- ---------------------------------------------------------------------------------------------------------------------------
$ 26,251- 63,550   $ 43,851-105,950    28.00       4.17       4.86       5.56       6.25       6.94       7.64       8.33
- ---------------------------------------------------------------------------------------------------------------------------
$ 63,551-132,600   $105,951-161,450    31.00       4.35       5.07       5.80       6.52       7.25       7.97       8.70
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
$132,601-288,350   $161,451-288,350    36.00       4.69       5.47       6.25       7.03       7.81       8.59       9.38
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>
  OVER $288,350    OVER $288,350       39.60       4.97       5.79       6.62       7.45       8.28       9.11       9.93
- ---------------------------------------------------------------------------------------------------------------------------
<S>                <C>                <C>        <C>        <C>        <C>        <C>        <C>        <C>        <C>

<S>                <C>
TAXABLE INCOME 20
  SINGLE RETURN     6.5%
                      IS
                   EQUIVALENT
                     TO A
                   TAXABLE
                   YIELD OF
- -----------------
$      0- 26,250     7.65
- -----------------
$ 26,251- 63,550     9.03
- -----------------
$ 63,551-132,600     9.42
                   --------
- -----------------
$132,601-288,350    10.16
                   --------
- -----------------
  OVER $288,350     10.76
                   --------
- -----------------
</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 2000 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:
  - elimination of one or more bonds from the Fund's portfolio because of calls,
    redemptions or sales;
  - a change in the Fund's expenses; or
  - 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):

<TABLE>
<S>              <C>  <C>
Estimated Annual         Estimated
Interest Income   -   Annual Expenses
- -------------------------------------
             Unit Price
</TABLE>

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:
- - a statement of income payments twice a year;
- - a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
- - an annual report on Fund activity; and
- - 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:
- - copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
- - audited financial statements of the Fund.

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

                                       6
<PAGE>
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 hospital and
health care bonds.
  - 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;
  - hospitals face increasing competition resulting from hospital mergers and
    affiliations;
  - hospitals need to reduce costs as HMOs increase market penetration and
    hospital supply and drug companies raise prices; and
  - hospitals and health care providers are subject to various legal claims by
    patients and others and are adversely affected by increasing costs of
    insurance.
  - many hospitals are aggressively buying physician practices and assuming risk
    contracts to gain market share. If revenues do not increase accordingly,
    this practice could reduce profits.
  - 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.
  - most retirement/nursing home providers rely on entrance fees for operating

                                       7
<PAGE>
    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 Municipal Defined
Fund 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:
  - limiting real property taxes,
  - reducing tax rates,
  - imposing a flat or other form of tax, or
  - 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:
  - ADDING the value of the bonds, net accrued interest, cash and any other Fund
    assets;
  - 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
  - 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.

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

                                       8
<PAGE>
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:
  - if the New York Stock Exchange is closed (other than customary weekend and
    holiday closings);
  - 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
  - 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.

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:
  - to reimburse the Trustee for the Fund's operating expenses;
  - for extraordinary services and costs of indemnifying the Trustee and the
    Sponsors;
  - costs of actions taken to protect the Fund and other legal fees and
    expenses;
  - expenses for keeping the Fund's registration statement current; and
  - 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. While this
fee may exceed the amount of these costs and 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

                                       10
<PAGE>
any calendar year. The Fund also pays the Evaluator's fees.

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; if
a contract to buy any bond fails in the first 90 days of the Fund, we generally
will deposit a replacement tax-exempt bond with a similar yield, maturity,
rating and price.

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 may affect the
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:
  - diversity of the portfolio;
  - size of the Fund relative to its original size;
  - ratio of Fund expenses to income;
  - current and long-term returns;
  - degree to which units may be selling at a premium over par; and
  - 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.

                                       11
<PAGE>
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.

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:
  - to cure ambiguities;
  - to correct or supplement any defective or inconsistent provision;
  - to make any amendment required by any governmental agency; or
  - 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:
  - it fails to perform its duties and the Sponsors determine that its
    replacement is in your best interest; or
  - 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:
  - remove it and appoint a replacement Sponsor;
  - liquidate the Fund; or
  - 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.

                                       12
<PAGE>
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
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 Chase Manhattan Bank, Unit Investment Trust Department, 4 New York
Plaza--6th Floor, New York, New York 10004, 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. Sponsors also realized
a profit or loss on deposit of the bonds shown under Defined Portfolio. 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 also realize profits
or sustain losses on bonds in the Fund which were acquired from underwriting
syndicates of which it was a member.

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

The Fund and the Agent for the Sponsors have each adopted a code of ethics
requiring reporting of personal securities transactions by its employees with
access to information on Fund transactions. Subject to certain conditions, the
codes permit employees to invest in Fund securities for their own

                                       13
<PAGE>
accounts. The codes are designed to prevent fraud, deception and misconduct
against the Fund and to provide reasonable standards of conduct. These codes are
on file with the Commission and you may obtain a copy by contacting the
Commission at the address listed on the back cover of this prospectus.

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"). To date we are not aware of any major operational difficulties
resulting from the computer system changes necessary to prepare for the Year
2000. However, there can be no assurance that the Year 2000 Problem will not
adversely affect the issuers of the bonds contained in the Portfolio. 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 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

                                       14
<PAGE>
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.

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 - 6,
          DEFINED ASSET FUNDS

          REPORT OF INDEPENDENT ACCOUNTANTS

          The Sponsors, Trustee and Holders
          of Municipal Defined Fund,
          Series - 6,
          Defined Asset Funds:

          We have audited the accompanying statement of condition of Municipal
          Defined Fund, Series - 6, Defined Asset Funds, including the
          portfolio, as of November 30, 1999 and the related statements of
          operations and of changes in net assets for the period December 17,
          1998 to November 30, 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 November 30, 1999, as shown
          in such portfolio, were confirmed to us by The Chase Manhattan Bank,
          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 - 6, Defined Asset Funds at November 30, 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.
          March 8, 2000


                                     D - 1.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     STATEMENT OF CONDITION
     As of November 30, 1999

<TABLE>
<S>                                                     <C>             <C>
TRUST PROPERTY:
  Investment in marketable securities -
     at value (cost $ 13,655,847) (Note 1) .......                      $11,791,935
  Accrued interest ...............................                          194,042
  Accrued interest on Segregated Bonds (Note 5) ..                            2,623
  Cash - income ..................................                           59,537
  Cash - income on Segregated Bonds ..............                            7,716
  Principal payments receivable ..................                            9,981
  Pre paid Trustee's fees ........................                           27,523
                                                                        -----------
    Total trust property .........................                       12,093,357

LESS LIABILITIES:
  Income advance from Trustee ....................      $     4,416
  Principal advance from Trustee .................            3,257
  Deferred sales charge (Note 5) .................           72,904
  Principal payments payable (Segregated Bonds) ..            6,724
  Income payments payable ........................              168
  Accrued Sponsors' fees .........................            4,744          92,213
                                                        -----------     -----------

NET ASSETS, REPRESENTED BY:
  13,501,643 units of fractional undivided
     interest outstanding (Note 3)................       11,729,370

  Undistributed net investment income ............          271,774     $12,001,144
                                                        -----------     ===========

UNIT VALUE ($ 12,001,144 / 13,501,643 units ).....                      $    .88887
                                                                        ===========

</TABLE>

                       See Notes to Financial Statements.


                                     D - 2.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     STATEMENT OF OPERATIONS

<TABLE>
<CAPTION>
                                               December 17, 1998
                                                       to
                                                  November 30,
                                                      1999
                                                      ----
<S>                                               <C>
INVESTMENT INCOME:
  Interest income ........................        $   711,254
  Interest income on Segregated
    Bonds (Note 5) .......................             10,339
  Trustee's fees and expenses ............             19,213
  Sponsors' fees .........................             (4,934)
                                                  ------------
  Net investment income ..................            735,872
                                                  ------------

REALIZED AND UNREALIZED LOSS
  ON INVESTMENTS:
  Realized loss on
    securities sold or redeemed ..........           (158,769)
  Unrealized depreciation
    of investments .......................         (1,863,912)
                                                  ------------
  Net realized and unrealized
     loss on investments .................         (2,022,681)
                                                  ------------

NET DECREASE IN NET ASSETS
  RESULTING FROM OPERATIONS ..............        $(1,286,809)
                                                  ============
</TABLE>

                       See Notes to Financial Statements.


                                     D - 3.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                   December 17, 1998
                                                           to
                                                      November 30,
                                                          1999
                                                          ----

<S>                                                   <C>
OPERATIONS:
  Net investment income ..................            $   735,872
  Realized loss on
    securities sold or redeemed ..........               (158,769)
  Unrealized depreciation
    of investments .......................             (1,863,912)
                                                      ------------
  Net decrease in net assets
    resulting from operations ............             (1,286,809)
                                                      ------------

INCOME DISTRIBUTIONS TO
   HOLDERS (Note 2).......................               (438,300)
                                                      ------------

SHARE TRANSACTIONS:
  Deferred sales charge (Note 5):
    Principal ............................               (124,871)

  Redemption amounts:
    Income ...............................                (15,459)
    Principal ............................             (1,339,130)
                                                      ------------
  Net share transactions .................             (1,479,460)
                                                      ------------

NET DECREASE IN NET ASSETS ...............             (3,204,569)

NET ASSETS AT BEGINNING OF PERIOD ........             15,205,713
                                                      ------------
NET ASSETS AT END OF PERIOD ..............            $12,001,144
                                                      ============
PER UNIT:
  Income distributions during
    period ...............................            $    .02922
                                                      ============
  Net asset value at end of
    period ...............................            $    .88887
                                                      ============
TRUST UNITS:
  Redeemed during period .................              1,498,357
  Outstanding at end of period ...........             13,501,643
                                                      ============
</TABLE>

                       See Notes to Financial Statements.


                                     D - 4.
<PAGE>

          MUNICIPAL DEFINED FUND,
          SERIES - 6,
          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 December 17, 1998 was based upon
                    offering side evaluations at December 15, 1998, the day
                    prior to the Date of Deposit. Cost of securities at December
                    17, 1998 was also based on such offering 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

          Semi-annual distributions of net investment income are made to
          Holders. Receipts other than interest, after deductions for
          redemptions and applicable expenses, are also distributed
          periodically.

     3.   NET CAPITAL

<TABLE>
<S>                                                                    <C>
     Cost of 13,501,643 units at Date of Deposit ................      $13,686,807
     Transfer to capital of interest on Segregated Bonds (Note 5)           10,339
     Redemptions of units - net cost of 1,498,357 units redeemed
       less redemption amounts (principal).......................          179,776
     Deferred sales charge (Note 5) .............................         (124,871)
     Realized loss on securities sold or redeemed ...............         (158,769)
     Unrealized depreciation of investments .....................       (1,863,912)
                                                                       -----------

     Net capital applicable to Holders ..........................      $11,729,370
                                                                       ===========
</TABLE>

     4.   INCOME TAXES

          As of November 30, 1999, unrealized depreciation of investments, based
          on cost for Federal income tax purposes, aggregated $1,863,912, all of
          which related to depreciated securities. The cost of investment
          securities for Federal income tax purposes was $13,655,847 at November
          30, 1999.


                                     D - 5.
<PAGE>

          MUNICIPAL DEFINED FUND,
          SERIES - 6,
          DEFINED ASSET FUNDS

          NOTES TO FINANCIAL STATEMENTS

     5.   DEFERRED SALES CHARGE

          $100,000 face amount of the State of Hawaii, Certs. of Part. (Kapolei
          State Office Bldg.), Ser. 1998 A, $25,000 face amount of Holly Area
          Sch. Dist., Oakland Cnty., MI, G.O. Rfdg. Bonds, Ser. 1998, $20,000
          face amount of New Jersey Hlth. Care Fac. Fin. Auth., Rev. Bonds
          (Centrastate Med. Ctr. Oblig. Grp. Iss.) Ser. 1998, $10,000 face
          amount of the State of Ohio, Tpke. Rev. Bonds (Ohio Tpke. Comm.), Ser.
          1998 B and $80,000 face amount of Commonwealth of Puerto Rico, Pub.
          Imp. Rfdg. Bonds, Ser. 1997, have been segregated to fund the deferred
          sales charges. The sales charges are being paid for with the proceeds
          received and by periodic sales or maturity of these bonds, as well as
          principal proceeds received in conjunction with the disposition on the
          unsegregated bonds in the portfolio. A deferred sales charge of $2.38
          per 1,000 Unit is charged on a quarterly basis in the first year and
          $2.37 per 1,000 Unit is charged on a quarterly basis in the second
          year, and paid to the Sponsors periodically by Trustee on behalf of
          the Holders, up to an aggregate of $19 per 1,000 Unit over the first
          two years of the life of the Fund. Should a Holder redeem Units prior
          to the second anniversary of the Fund, the remaining balance of the
          deferred sales charge will be charged.


                                     D - 6.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of November 30, 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 Louisiana Offshore Terminal Auth.,         A       $ 1,150,000     5.200 %      2018      10/01/08     $ 1,163,110 $ 1,033,747
     Deepwater Port Rfdg. Rev. Bonds (LOOP LLC                                                 @  100.000
     Proj.), Ser. 1998

   2 State of Ohio, Tpke. Rev. Bonds (Ohio      AAA          10,000     3.750        2000      None              10,056       9,996
     Tpke. Comm.), Ser. 1998 B (5)

   3 Emanuel Cnty., GA, G.O. Bonds, Ser. 1998   NR          750,000     5.650        2028      08/01/08         758,265     661,973
                                                                                               @  100.000

   4 Holly Area Sch. Dist., Oakland Cnty., MI,  AAA          25,000     3.600        2000      None              25,234      24,973
     G.O. Rfdg. Bonds, Ser. 1998 (Financial
     Guaranty Ins.) (4) (5)

   5 The City of New York, NY, G.O. Bonds,      A(f)      1,000,000     5.125        2025      08/01/08       1,000,000     867,290
     Fiscal Ser. 1998 H                                                                        @  101.000

   6 Commonwealth of Puerto Rico, Pub. Imp.     A            80,000     5.500        2000      None              82,444      80,713
     Rfdg. Bonds, Ser. 1997 (5)

   7 Illinois Hlth. Fac. Auth., Rev. Bonds      A-          540,000     5.750        2027      08/15/07         564,381     484,034
     (Victory Hlth. Svcs.), Ser. 1997 A                                                        @  101.000

   8 Hospital Auth. of Elkhart Cnty., IN,       A1(m)       870,000     5.250        2028      02/15/11         857,063     729,469
     Hosp. Rev. Bonds (Elkhart Gen. Hosp.,                                                     @  100.000
     Inc.), Ser. 1998

   9 Hospital Auth. No. 1 of Scotts Bluff       A-        1,000,000     5.250        2028      11/15/08         992,490     834,550
     Cnty., NE, Rev. Bonds (Regional West Med.                                                 @  100.000
     Ctr. Proj.), Ser. 1998

</TABLE>


                                     D - 7.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of November 30, 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 New Jersey Hlth. Care Fac. Fin. Auth.,     AAA     $    20,000     3.450 %      2000      None         $    20,044 $    19,940
     Rev. Bonds (Centrastate Med. Ctr. Oblig.
     Grp. Iss.), Ser. 1998 (AMBAC Ins.) (4) (5)

  11 New Mexico Hosp. Equip. Loan Council,      A-(f)     1,020,000     5.375        2018      06/01/08       1,022,132     885,166
     Hosp. Rev. Bonds (Mem. Med. Ctr., Inc.                                                    @  101.000
     Proj.), Ser. 1998

  12 Cumberland Cnty. Mun. Auth., PA, Rev.      A           540,000     6.000        2026      12/01/06         571,460     515,738
     Bonds (Presbyterian Homes, Inc. Proj.),                                                   @  100.000
     Ser. 1996 (ACA Ins.) (4)

  13 Montgomery Cnty., PA, Ind. Dev. Auth.,     A-        1,150,000     5.250        2028      11/15/08       1,132,877     955,869
     Retirement Cmnty. Rev. Bonds (ACTS                                                        @  100.000
     Retirement-Life Cmnty., Inc. Oblig.
     Grp.), Ser. 1998

  14 Bell Cnty. Hlth. Facs. Dev. Corp., TX,     A-          430,000     5.250        2028      11/15/08         426,771     356,453
     Retirement Fac. Rev. Bonds (Buckner                                                       @  101.000
     Retirement Svcs., Inc. Obligated Grp.
     Proj.), Ser. 1998

  15 Wisconsin Hlth. and Educl. Fac. Auth.,     A-          450,000     5.500        2028      02/15/08         457,475     379,625
     Rev. Bonds (Franciscan Sisters of                                                         @  101.000
     Christian Charity HealthCare Ministry,
     Inc.), Ser. 1998 A

  16 Missouri Dev. Fin. Bd., Multifamily Hsg.   AA          290,000     5.600        2028      09/15/07         293,474     268,204
     Rev. Rfdg. Bonds (Quality Hill Proj.),                                                    @  101.000
     Ser. 1999 A (Asset Guaranty Ins.)(4)

  17 State of Hawaii, Certs. of Part. (Kapolei  AAA         100,000     3.800        2001      None             100,335      98,976
     State Office Bldg.), Ser. 1998 A (AMBAC
     Ins.) (4) (5)

  18 New York State Urban Dev. Corp.,           A(f)      1,150,000     5.000        2025      01/01/09       1,133,486     969,059
     Correctional Facs. Serv. Contract, Rev.                                                   @  101.000
     Bonds, Ser. B
</TABLE>


                                     D - 8.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     PORTFOLIO
     As of November 30, 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 City of Austin, TX, Sub. Lien Rev. Rfdg.   AAA     $ 1,150,000     4.250 %      2028      05/15/08     $ 1,025,915 $   854,738
     Bonds, Ser. 1998 A (MBIA Ins.) (4)                                                        @  101.000

  20 Hereford, Tx, Ind. Sch. Dist. Pub. Fac.    A           100,000     5.375        2023      08/15/08         101,072      89,584
     Corp., Sch. Fac. Lease Rev. Bonds, Ser.                                                   @  102.000
     1998 (ACA Ins.) (4)

  21 New Hampshire Higher Educl. and Hlth.      A         1,150,000     5.500        2028      07/01/08       1,174,622   1,020,809
     Facs. Auth. Rev. Bonds (Franklin Pierce                                                   @  101.000
     Law Ctr. Iss.), Ser. 1998 (ACA Ins.) (4)

  22 New Jersey Educl. Fac. Auth., Rev. Bonds   NR          485,000     5.700        2028      07/01/08         493,192     437,761
     (Fairleigh Dickinson Univ. Iss.), Ser.                                                    @  101.000
     1998 G

  23 Washington State Univ., Rec. Ctr. Rev.     AAA          45,000     5.000        2032      04/01/08          44,279      37,632
     Bonds, Ser. 1998 (AMBAC Ins.) (4)                                                         @  101.000

  24 Central Falls Detention Fac. Corp., RI,    AA          210,000     5.000        2023      01/15/08         205,670     175,636
     Detention Fac. Rev. Rfdg. Bonds (The                                                      @  102.000
     Donald W. Wyatt Detention Fac.), Ser.
     Ser. 1998 A (Asset Guaranty Ins.) (4)
                                                         ----------                                          ----------  ----------
     TOTAL                                              $13,715,000                                         $13,655,847 $11,791,935
                                                         ==========                                          ==========  ==========
</TABLE>

                             See Notes to Portfolio.


                                     D - 9.
<PAGE>

     MUNICIPAL DEFINED FUND,
     SERIES - 6,
     DEFINED ASSET FUNDS

     NOTES TO PORTFOLIO
     As of November 30, 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) These bonds have been segregated to fund the deferred sales charges.


                                    D - 10.
<PAGE>
DEFINED ASSET FUNDS-SM-

<TABLE>
<S>                                      <C>
HAVE QUESTIONS ?                         MUNICIPAL DEFINED FUND--6
Request the most recent free             (A Unit Investment Trust)
Information Supplement                   ---------------------------------------
that gives more details about            This Prospectus does not contain
the Fund, by calling:                    complete information about the
The Chase Manhattan Bank                 investment company filed with the
1-800-323-1508                           Securities and Exchange Commission in
The Bank of New York                     Washington, D.C. under the:
1-800-221-7771                           - Securities Act of 1933 (file no.
                                         333-66201) and
                                         - Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         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.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         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.
                                                                     32720--3/00
</TABLE>



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