VANGUARD FLORIDA INSURED TAX FREE FUND
485BPOS, 1994-03-09
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<PAGE>
 
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                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                                   FORM N-1A
                   
                REGISTRATION STATEMENT (NO. 33-48783) UNDER     
                           THE SECURITIES ACT OF 1933
 
                         PRE-EFFECTIVE AMENDMENT NO. .
                         
                      POST-EFFECTIVE AMENDMENT NO. 2     
                                      AND
 
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
 
                                AMENDMENT NO. 2
 
                     VANGUARD FLORIDA INSURED TAX-FREE FUND
               (EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER)
                      
                   P.O. BOX 2600, VALLEY FORGE, PA 19482     
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICE)
                  
               REGISTRANT'S TELEPHONE NUMBER (610) 669-1000     
 
                         RAYMOND J. KLAPINSKY, ESQUIRE
                                  P.O. BOX 876
                             VALLEY FORGE, PA 19482
 
  APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING: AS SOON AS PRACTICABLE AFTER
THIS REGISTRATION STATEMENT BECOMES EFFECTIVE.
   
  IT IS HEREBY REQUESTED THAT THIS FILING BECOME EFFECTIVE ON MARCH 11, 1994,
PURSUANT TO PARAGRAPH (B) OF RULE 485.     
   
  REGISTRANT ELECTS TO REGISTER AN INDEFINITE NUMBER OF SHARES PURSUANT TO
REGULATION 24F-2 UNDER THE INVESTMENT COMPANY ACT OF 1940. REGISTRANT FILED ITS
RULE 24F-2 NOTICE FOR THE PERIOD ENDED NOVEMBER 30, 1993 ON JANUARY 25, 1994.
    
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<PAGE>
 
                     VANGUARD FLORIDA INSURED TAX-FREE FUND
 
                             CROSS REFERENCE SHEET
 
<TABLE>
<CAPTION>
  FORM N-1A
 ITEM NUMBER                                      LOCATION IN PROSPECTUS
 <C>         <C>                                  <S>
  Item 1.    Cover Page.......................... Cover Page
  Item 2.    Synopsis............................ Not Applicable
  Item 3.    Condensed Financial Information..... Financial Highlights
  Item 4.    General Description of Registrant... Investment Objective;
                                                  Investment Limitations;
                                                  Investment Policies; General
                                                  Information
  Item 5.    Management of the Fund.............. Trustees and Officers;
                                                  Management of the Fund
  Item 6.    Capital Stock and Other Securities.. Opening an Account and
                                                  Purchasing Shares; Selling
                                                  Your Shares; The Fund's Share
                                                  Price; Dividends, Capital
                                                  Gains and Taxes; General
                                                  Information
  Item 7.    Purchase of Securities Being         Cover Page; Opening an
             Offered............................. Account and Purchasing Shares
  Item 8.    Redemption or Repurchase............ Selling Your Shares
  Item 9.    Pending Legal Proceedings........... Not Applicable
<CAPTION>
  FORM N-1A                                       LOCATION IN STATEMENT
 ITEM NUMBER                                      OF ADDITIONAL INFORMATION
 <C>         <C>                                  <S>
  Item 10.   Cover Page.......................... Cover Page
  Item 11.   Table of Contents................... Cover Page
  Item 12.   General Information and History..... Management of the Fund
  Item 13.   Investment Objective and Policies... Investment Limitations
  Item 14.   Management of the Fund.............. Management of the Fund;
                                                  Investment Management
  Item 15.   Control Persons and Principal
             Holders of Securities............... Management of the Fund
  Item 16.   Investment Advisory and Other        Management of the Fund;
             Services............................ Investment Management
  Item 17.   Brokerage Allocation................ Not Applicable
  Item 18.   Capital Stock and Other Securities.. Financial Statement
  Item 19.   Purchase, Redemption and Pricing of  Purchase of Shares;
             Securities Being Offered............ Redemption of Shares
  Item 20.   Tax Status.......................... Appendix
  Item 21.   Underwriters........................ Not Applicable
  Item 22.   Calculations of Yield Quotations of
             Money Market Fund................... Not Applicable
  Item 23.   Financial Statements................ Financial Statement
</TABLE>
<PAGE>
 
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(ART)                                             A Member of The Vanguard Group
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PROSPECTUS--MARCH 11, 1994     
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NEW ACCOUNT INFORMATION: INVESTOR INFORMATION DEPARTMENT--1-800-662-7447 (SHIP)
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SHAREHOLDER ACCOUNT SERVICES: CLIENT SERVICES DEPARTMENT--1-800-662-2739 (CREW)
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INVESTMENT       Vanguard Florida Insured Tax-Free Fund (the "Fund") is an
OBJECTIVE &      open-end, non-diversified investment company that seeks to
POLICIES         provide income that is exempt from federal personal income
                 taxes. It is also expected that the Fund's shares will be ex-
                 empt from the Florida intangible personal property tax. The
                 Fund will invest primarily in securities issued by municipal
                 Florida state and local governments and public financing au-
                 thorities, but may also invest in securities of issuers other
                 than Florida and its political subdivisions. The Fund is
                 available only to Florida residents.
- --------------------------------------------------------------------------------
 
OPENING AN       Please complete and return the Account Registration Form. If
ACCOUNT          you need assistance in completing this Form, please call the
                 Investor Information Department. The minimum initial invest-
                 ment is $3,000. The Fund is offered on a no-load basis (i.e.,
                 there are no sales commissions or 12b-1 fees). However, the
                 Fund incurs expenses for investment advisory, management, ad-
                 ministrative and distribution services.
 
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ABOUT THIS          
PROSPECTUS       This Prospectus is designed to set forth concisely the infor-
                 mation that you should know about the Fund before you invest.
                 It should be retained for future reference. A "Statement of
                 Additional Information" containing additional information
                 about the Fund has been filed with the Securities and Ex-
                 change Commission. This Statement is dated March 11, 1994,
                 and has been incorporated by reference into this Prospectus.
                 It may be obtained, without charge, by writing to the Fund or
                 by calling the Investor Information Department.     
 
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TABLE OF CONTENTS
<TABLE>
<CAPTION>
                       Page
<S>                    <C>
Fund Expenses.........   2
Financial Highlights..   2
Yield and Total
 Return...............   3
   FUND INFORMATION
Investment Objective..   4
Investment Policies...   4
Investment Risks......   5
Who Should Invest.....   7
How to Compare Tax-
 Free and Taxable
 Yields...............   8

Implementation of
 Policies............    8
Investment Limita-
 tions...............   13
Management of the
 Fund................   14
Investment Adviser...   15
Dividends, Capital
 Gains and Taxes.....   15
The Share Price of
 the Fund............   17
General Information..   18

  SHAREHOLDER GUIDE
Opening an Account
 and Purchasing
 Shares..............   19
When Your Account
 Will Be Credited....   22
Selling Your Shares..   22
Exchanging Your
 Shares..............   25
Important Information
 About Telephone
 Transactions........   26
Transferring Regis-
 tration.............   27
Other Vanguard Serv-
 ices................   27
</TABLE>
 
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THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE COMMISSION PASSED UPON THE ACCURACY OR AD-
EQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OF-
FENSE.     
 
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<PAGE>
 
                    
FUND EXPENSES    The following table illustrates ALL expenses and fees that
                 you would incur as a shareholder of the Fund. The expenses
                 set forth below are for the 1993 fiscal year.     
 
<TABLE>
<CAPTION>
                SHAREHOLDER TRANSACTION EXPENSES
                -------------------------------------------------------
                <S>                                                <C>
                Sales Load Imposed on Purchases................... None
                Sales Load Imposed on Reinvested Dividends........ None
                Redemption Fees*.................................. None
                Exchange Fees..................................... None
<CAPTION>
                ANNUAL FUND OPERATING EXPENSES
                -------------------------------------------------------
                <S>                                               <C>
                Management & Administrative Expenses.............. 0.16%
                Investment Advisory Expenses...................... 0.01
                12b-1 Fees........................................ None
                Other Expenses
                 Distribution Costs........................ 0.02%
                 Fund Insurance............................ 0.00
                 Miscellaneous Expenses.................... 0.02
                                                            ------
                Total Other Expenses.............................. 0.04%
                                                                   ------
                   TOTAL OPERATING EXPENSES....................... 0.21%
                                                                   ======
</TABLE>
                        
                     * Wire redemptions of less than $5,000 are subject to a
                      $5 charge.     
 
                 The purpose of this table is to assist you in understanding
                 the various costs and expenses that you would bear directly
                 or indirectly as an investor in the Fund.
 
                 The following example illustrates the expenses that you would
                 incur on a $1,000 investment over various periods, assuming
                 (1) a 5% annual rate of return and (2) redemption at the end
                 of each period.
 
                   1 YEAR        3 YEARS          5 YEARS          10 YEARS
                   ------        -------          -------          --------
                     $2            $7               $12              $27
 
                 THIS EXAMPLE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
                 PAST OR FUTURE EXPENSES OR PERFORMANCE. ACTUAL EXPENSES MAY
                 BE HIGHER OR LOWER THAN THOSE SHOWN.
 
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FINANCIAL        The following financial highlights for a share outstanding
HIGHLIGHTS       throughout each of the periods, have been audited by Price
                 Waterhouse, independent accountants, whose report thereon was
                 unqualified. This information should be read in conjunction
                 with the financial statements and notes thereto which are in-
                 corporated by reference in the Statement of Additional Infor-
                 mation and in this Prospectus, and which appear, along with
                 the report of Price Waterhouse, in the Fund's 1993 Annual Re-
                 port to Shareholders. For a more complete discussion of the
                 Fund's performance, please see the Fund's 1993 Annual Report
                 to Shareholders, which may be obtained without charge by
                 writing to the Fund or by calling our Investor Information
                 Department at 1-800-662-7447.     
 
2
<PAGE>
 
<TABLE>
<CAPTION>
                                                           YEAR     SEPTEMBER 1
                                                          ENDED          TO
                                                       NOVEMBER 30, NOVEMBER 30,
                                                           1993         1992
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<S>                                                    <C>          <C>
NET ASSET VALUE, BEGINNING OF PERIOD.................     $10.16       $10.00
                                                          ------       ------
INVESTMENT OPERATIONS
 Net Investment Income...............................       .537         .122
 Net Realized and Unrealized Gain (Loss) on Invest-
  ments..............................................       .700         .160
                                                          ------       ------
  TOTAL FROM INVESTMENT OPERATIONS...................      1.237         .282
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DISTRIBUTIONS
 Dividends from Net Investment Income................      (.537)       (.122)
 Distributions from Realized Capital Gains...........        --            --
                                                          ------       ------
  TOTAL DISTRIBUTIONS................................      (.537)       (.122)
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NET ASSET VALUE, END OF PERIOD.......................     $10.86       $10.16
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TOTAL RETURN.........................................      12.38%        2.84%
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RATIOS/SUPPLEMENTAL DATA
Net Assets, End of Period (Millions).................       $269          $63
Ratio of Expenses to Average Net Assets..............        .21%         .24%*
Ratio of Net Investment Income to Average Net Assets.       5.01%        5.10%*
Portfolio Turnover Rate..............................         34%          15%
</TABLE>
   
* Annualized.     
   
+ Commencement of operations.     
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YIELD AND        From time to time the Fund may advertise its yield and total
TOTAL RETURN     return. Both yield and total return figures are based on his-
                 torical earnings and are not intended to indicate future per-
                 formance. The "total return" of the Fund refers to the aver-
                 age annual compounded rates of return over one-, five- and
                 ten-year periods or over the life of the Fund (as stated in
                 the advertisement) that would equate an initial amount in-
                 vested at the beginning of a stated period to the ending re-
                 deemable value of the investment, assuming the reinvestment
                 of all dividend and capital gains distributions.     
 
                 The "30-day yield" of the Fund is calculated by dividing the
                 net investment income per share earned during a 30-day period
                 by the net asset value per share on the last day of the peri-
                 od. Net investment income includes interest and dividend in-
                 come earned on the Fund's securities; it is net of all ex-
                 penses and all recurring and nonrecurring charges that have
                 been applied to all shareholder accounts. The yield calcula-
                 tion assumes that the net investment income earned over 30
                 days is compounded monthly for six months and then
                 annualized. Methods used to calculate advertised yields are
                 standardized for all bond mutual funds. However, these meth-
                 ods differ from the accounting methods used by the Fund to
                 maintain its books and records, and so the advertised 30-day
                 yield may not fully reflect the income paid to your own ac-
                 count or the yield reported in the Fund's financial state-
                 ments.
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                                                                               3
<PAGE>
          
INVESTMENT       The Fund is an open-end, non-diversified investment company.
OBJECTIVE        The objective of the Fund is to provide investors with a high
                 level of income that is exempt from federal personal income
THE FUND SEEKS   taxes. The Fund is also designed to provide an investment
TO PROVIDE       that is exempt from the Florida intangible personal property
INCOME EXEMPT    tax.      
FROM FEDERAL 
INCOME TAXES     The Fund is available only to investors who reside in Flori- 
                 da. There is no assurance that the Fund will achieve its    
                 stated objective.                                           
 
                 The investment objective of the Fund is fundamental and so
                 cannot be changed without the approval of a majority of the
                 Fund's shareholders.
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INVESTMENT       The Fund will invest at least 80% of its net assets in in-
POLICIES         sured Florida municipal securities, exclusive of Florida AMT
                 bonds (see below). Florida municipal securities are debt ob-
THE FUND         ligations issued by Florida state and local governments and
INVESTS IN       public financing authorities (and by certain U.S. territo-
INSURED          ries) that provide interest income that is exempt from fed-
FLORIDA          eral personal income taxes. The Florida municipal securities
MUNICIPAL        described above, may include securities in which the tax ex-
SECURITIES       empt interest rate is determined by an index, swap or some
EXEMPT FROM      other formula. Insured Florida municipal securities are those
THE FLORIDA      in which scheduled payments of interest and principal are
INTANGIBLE TAX   guaranteed by a private (non-governmental) insurance company.
                     
                 THE INSURANCE FEATURE OF THE FUND DOES NOT GUARANTEE THE MAR-
                 KET VALUE OF THE MUNICIPAL BONDS OR THE VALUE OF THE FUND'S
                 SHARES. The insurance refers to the face or par value of the
                 securities in the Fund. See "Implementation of Policies" for
                 a description of the Fund's insurance feature.
 
                 Under normal circumstances, the Fund will only invest in in-
                 sured Florida municipal securities and other investments
                 (such as certain short-term cash investments) that are exempt
                 from the Florida intangible personal property tax. Thus, it
                 is expected that the Fund's shares will be exempt from the
                 Florida intangible tax for Florida residents. See "Dividends,
                 Capital Gains and Taxes" for more information.
 
                 The Fund is expected to maintain a dollar-weighted average
                 maturity between 15 and 25 years. BONDS WITH LONGER MATURI-
                 TIES USUALLY OFFER HIGHER YIELDS, BUT ARE ALSO SUBJECT TO
                 GREATER MARKET FLUCTUATIONS AS INTEREST RATES CHANGE. See
                 "Investment Risks."
 
                 Normally, the Fund seeks to invest substantially all of its
                 assets in insured Florida municipal obligations. However, un-
                 der certain circumstances, such as a temporary decline in the
                 issuance of Florida obligations, the Fund may invest up to
                 20% of its assets in any combination of the following securi-
                 ties:
                    
                 . Municipal notes and variable rate demand instruments, in-
                   cluding derivative securities, rated MIG-1 or VMIG-1, or P-
                   1 by Moody's Investors Service, Inc. ("Moody's") or SP-1+,
                   SP-1, A-1+, or A-1 by Standard & Poor's Corporation ("Stan-
                   dard & Poor's");     
 
                 . Uninsured, short-term municipal securities; and
 
                 . Certain taxable securities, including U.S. Government secu-
                   rities.
 
4
<PAGE>
 
                    
                 In such cases, a portion of the Fund's income may be subject
                 to federal income taxes, and all or a portion of the Fund's
                 assets may be subject to the Florida intangible personal
                 property tax, or both.     
 
                 Subject to the same 20% limit, the Fund is also authorized to
                 invest in Florida AMT bonds. The income from Florida AMT
                 bonds is exempt from federal income taxes but is a tax pref-
                 erence item for purposes of the federal alternative minimum
                 tax. Although authorized to invest in AMT bonds, the Fund has
                 no present intention to do so.
 
                 Under unusual circumstances, such as a national financial
                 emergency, the Fund reserves the right to invest more than
                 20% of its assets in securities other than Florida municipal
                 obligations. In most instances, however, the Fund will seek
                 to avoid such holdings in an effort to provide income that is
                 fully exempt from federal personal income taxes and an in-
                 vestment that is exempt from the Florida intangible personal
                 property tax.
    
THE FUND WILL    
DIVERSIFY ITS    Although organized as a non-diversified investment company,
HOLDINGS         the Fund intends to diversify its holdings of Florida munici-
                 pal securities by complying with Subchapter M of the Internal
                 Revenue Code. In part, Subchapter M requires that, at the
                 close of each quarter of the taxable year, those issues which
                 represent more than 5% of the Fund's assets be limited in ag-
                 gregate to 50% of the Fund, and that no one issue exceeds 25%
                 of the Fund's total assets. As of November 30, 1993, the Fund
                 held securities of 62 issuers, with the largest holding rep-
                 resenting 3.28% of the Fund's assets. As of November 30, 1993
                 the Fund's top ten holdings, based on market value, repre-
                 sented 24.19% of its net assets.     
 
                 The Fund's policy of investing at least 80% of its assets in
                 Florida municipal securities under normal circumstances is
                 fundamental and may not be changed without shareholder ap-
                 proval. The other investment policies described above are not
                 fundamental and so may be changed by the Board of Trustees
                 without shareholder approval. However, shareholders would be
                 notified of any material change in the Fund's policies.
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                 As a mutual fund investing in long-term municipal securities,
INVESTMENT       the Fund is subject to both interest rate and credit risk.
RISKS     
                 
THE FUND IS      INTEREST RATE RISK is the potential for bond price fluctua-
SUBJECT TO       tions due to changing interest rates. In general, bond prices
INTEREST RATE,   vary inversely with interest rates. If interest rates rise,
CREDIT, CALL     bond prices generally decline; if interest rates fall, bond
AND INCOME       prices generally rise. In addition, for a given change in in-
RISK             terest rates, longer-maturity bonds exhibit greater price
                 fluctuations than shorter-maturity bonds. To compensate in-
                 vestors for this risk, longer-maturity bonds generally offer
                 higher yields than shorter-maturity bonds, other factors, in-
                 cluding credit quality, being equal. Interest rate risk may
                 be increased or decreased when a portfolio initiates or pur-
                 chases derivative Florida municipal securities. Such deriva-
                 tive securities rely on sophisticated interest rate calcula-
                 tion mechanisms. For certain types of     
                                                                               5
<PAGE>
 
                    
                 derivative bonds, the magnitude of increases and decreases in
                 their price may be proportionately larger or smaller than, or
                 inverse to, the price changes that broad market interest rate
                 fluctuations would produce in long term bonds.     
                    
                 CREDIT RISK is the possibility that a bond issuer will fail
                 to make timely payments of interest or principal to a fund.
                 The credit risk of a fund depends on the credit quality of
                 its underlying securities. In general, the lower the credit
                 quality of a fund's municipal securities, the higher a fund's
                 yield, all other factors such as maturity being equal.     
                    
                 CALL RISK is the possibility that, during periods of falling
                 interest rates, a municipal security with a high stated in-
                 terest rate will be prepaid (or "called") prior to its ex-
                 pected maturity date. As a result, a fund will be required to
                 invest the unanticipated proceeds at lower interest rates,
                 and the fund's income may decline. Call provisions are most
                 common for intermediate- and long-term municipal bonds.     
                    
                 INCOME RISK is the potential for a decline in a fund's income
                 due to falling market interest rates. Because a fund's income
                 is based on interest rates, which can fluctuate substantially
                 over short periods, income risk is expected to vary from fund
                 to fund.     
   
THE FUND IS      Finally, the investment adviser manages the Fund according to
SUBJECT TO       the traditional methods of "active" investment management,
MANAGER RISK     which involves the buying and selling of securities based
                 upon economic, financial and market analysis and investment
                 judgment. MANAGER RISK refers to the possibility that the
                 Fund's investment adviser may fail to execute the Fund's in-
                 vestment strategy effectively. As a result, the Fund may fail
                 to achieve its stated objective.     
                    
                 Because the Fund invests in long-term municipal bonds, inter-
                 est rate risk for the Fund may be high. The average weighted
                 maturity of the Fund is expected to exceed 15 years, meaning
                 that the Fund's share price will fluctuate, sometimes sub-
                 stantially, when interest rates change. The following chart
                 illustrates the potential interest rate risk of the Fund. The
                 chart shows the market value of a $1,000 investment in a sin-
                 gle bond with the same yield and maturity characteristics as
                 the Fund on November 30, 1993, assuming a 1% and 2% increase
                 or decrease in interest rates:     
 
<TABLE>
<CAPTION>
                         HYPOTHETICAL VALUE OF $1,000 INVESTMENT
                         ---------------------------------------
                                        AFTER PERCENTAGE POINT CHANGE OF:
                                      -----------------------------------------
                30-DAY    AVERAGE        1%         1%         2%         2%
                YIELD     MATURITY    INCREASE   DECREASE   INCREASE   DECREASE
                ------   ----------   --------   --------   --------   --------
               <S>       <C>          <C>        <C>        <C>        <C>
                4.88%    10.7 years     $921      $1,087      $850      $1,183
</TABLE>
 
                 This chart is intended to provide you with general guidelines
                 for evaluating the effect of interest rate changes on the
                 Fund and determining the degree of interest rate risk you may
                 be willing to assume. The yield and price changes shown are
 
6
<PAGE>
 
                 purely for illustrative purposes, and should not be taken as
                 representative of current or future yields or expected
                 changes in the share price of the Fund.
 
CREDIT RISK IS   Credit risk depends on the average quality of the Fund's un-
EXPECTED TO BE   derlying securities and the Fund's degree of diversification.
LOW              The Fund invests primarily in bonds insured by top-rated in-
                 surance companies against the possible default of an issuer
                 as to the timely payment of interest and principal. As a re-
                 sult, the average credit quality of the Fund is expected to
                 be very high, and credit risk is expected to be minimal.
                    
                 Ordinarily, an investment company concentrating its invest-
                 ments in one state, such as the Fund, would be exposed to
                 greater credit risks than an investment company investing in
                 a nationally diversified portfolio of municipal securities.
                 These risks include possible tax law changes, a deterioration
                 in economic conditions, and differing levels of supply and
                 demand for Florida municipal obligations.     
 
                 To minimize the effects of concentrating its investments in
                 Florida obligations, the Fund intends to diversify its hold-
                 ings by complying with Subchapter M of the Internal Revenue
                 Code. (See "Investment Policies" for a description of the re-
                 quirements of Subchapter M.) In addition, the use of munici-
                 pal bond insurance should minimize the credit risk associated
                 with the Fund.
 
<TABLE>
<CAPTION>
                   CREDIT          INTEREST                INCOME               PREPAYMENT/
                    RISK           RATE RISK                RISK                 CALL RISK
                   ------          ---------               ------               -----------
                  <S>              <C>                     <C>                  <C>
                  Very Low           High                   Low                   Medium
</TABLE>
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WHO SHOULD       The Fund is intended for Florida residents seeking income
INVEST           that is exempt from federal personal income taxes. The Fund
                 also provides an investment which is expected to be exempt
                 from the Florida intangible personal property tax. As a rule,
                 tax-free income is attractive to investors in high federal
                 tax brackets. You can determine whether tax-exempt or taxable
                 income is more attractive in your own case by comparing the
                 Fund's tax-free yield with the yield from a comparable tax-
                 able mutual fund investment. See "How to Compare Tax-Free and
                 Taxable Yields".     
 
FLORIDA
RESIDENTS        Assuming that tax-free income is attractive in your own tax  
SEEKING A TAX-   bracket, you should weigh an investment in the Fund in terms 
EXEMPT           of its expected yield and price volatility, and your own in- 
INVESTMENT       vestment objectives, risk preferences, and time horizon. The 
                 Fund is suitable for investors who are seeking the highest,  
                 most durable streams of income and who can tolerate sometimes 
                 sharp fluctuations in share price in pursuit of their income  
                 objectives. The yield of the Fund is expected to be higher,   
                 and the level of income provided more stable, than that pro-  
                 vided by other mutual funds which invest in short-term secu-  
                 rities. However, because of the Fund's potential price vola-  
                 tility, the Fund is appropriate only for those investors who  
                 can hold their investment over the long term.                 
 
                                                                               7
<PAGE>
 
                    
                 The Fund is intended to be a long-term investment vehicle and
                 is not designed to provide investors with a means of specu-
                 lating on short-term market movements. Investors who engage
                 in excessive account activity generate additional costs which
                 are borne by all of the Fund's shareholders. In order to min-
                 imize such costs, the Fund has adopted the following poli-
                 cies. The Fund reserves the right to reject any purchase re-
                 quest (including exchange purchases from other Vanguard port-
                 folios) that is reasonably deemed to be disruptive to effi-
                 cient portfolio management, either because of the timing of
                 the investment or previous excessive trading by the investor.
                 Additionally, the Fund has adopted exchange privilege limita-
                 tions as described in the section "Exchange Privilege Limita-
                 tions." Finally, the Fund reserves the right to suspend the
                 offering of its shares.     
- --------------------------------------------------------------------------------
HOW TO COMPARE   Before choosing a specific tax-exempt investment, such as the
TAX-FREE AND     Fund, you should determine if you would be better off with
TAXABLE YIELDS   taxable or tax-exempt income in your tax bracket. To compare
                 taxable and tax-free income, you should calculate the "tax-
                 able equivalent yield" for the Fund you are considering, and
                 compare it with the yield of a taxable investment with simi-
                 lar credit and maturity characteristics.
 
                 The taxable equivalent yield for a Fund is based upon the
                 Fund's current tax-exempt yield and your federal tax bracket.
                 The formula is:
 
                        Fund's Tax-Free Yield
                   -------------------------------                Your Taxable
                   100% - Your Federal Tax Bracket      =       Equivalent Yield
                    
                 For example, if you are in a federal tax bracket of 28%, and
                 the Fund's tax-free yield is 6%, the Fund's taxable equiva-
                 lent yield would be 8.33%:     
 
                            6%
                        ----------
                        100% - 28%        =       8.33%
                    
                 In this example, you would choose the tax-free investment if
                 the 8.33% taxable equivalent yield were greater than the tax-
                 able yield from a comparable investment (e.g., a taxable bond
                 fund of comparable maturity and credit quality).     
- --------------------------------------------------------------------------------
              
IMPLEMENTATION   The Fund's adviser uses a variety of investment vehicles to
OF POLICIES      achieve the objective of the Fund.      
                    
THE FUND         The Fund invests principally in tax-exempt Florida municipal
INVESTS IN       securities, which are debt obligations issued by Florida
MUNICIPAL        state and local governments and public financing authorities
BONDS, NOTES     (and by certain U.S. territories) that provide interest in-
AND SECURITIES   come that is exempt from federal income taxes. Such securi-
DERIVED FROM     ties are also exempt from the Florida intangible personal
MUNICIPAL        property tax. Municipal securities include both municipal
BONDS AND        bonds (those securities with maturities of five years or
NOTES            more) municipal notes (those securities with maturities of
                 less than five years) and derivative securities (those secu-
                 rities in which a maturity may have been shortened by a de-
                 mand feature).     
 
 
8
<PAGE>
 
                 Municipal bonds are issued for a wide variety of reasons: to
                 construct public facilities, such as airports, highways,
                 bridges, schools, hospitals, housing, mass transportation,
                 streets, water and sewer works; to obtain funds for operating
                 expenses; to refund outstanding municipal obligations; and to
                 loan funds to various public institutions and facilities.
                 Certain industrial development bonds are also considered mu-
                 nicipal bonds if their interest is exempt from federal income
                 tax. Industrial development bonds are issued by or on behalf
                 of public authorities to obtain funds for various privately
                 operated manufacturing facilities, housing, sports arenas,
                 convention centers, airports, mass transportation systems,
                 and water, gas or sewage works.
 
                 General obligation municipal bonds are secured by the is-
                 suer's pledge of full faith, credit and taxing power. Revenue
                 or special tax bonds are payable from the revenues derived
                 from a particular facility or, in some cases, from a special
                 excise or other tax, but not from general tax revenue. Indus-
                 trial development bonds are ordinarily dependent on the
                 credit quality of a private authority.
 
                 Municipal notes are issued to meet the short-term funding re-
                 quirements of local, regional and state governments. Munici-
                 pal notes include tax anticipation notes, bond anticipation
                 notes, revenue anticipation notes, tax and revenue anticipa-
                 tion notes, construction loan notes, short-term discount
                 notes, tax-exempt commercial paper, and demand notes. Demand
                 notes permit an investor (such as the Fund) to demand from
                 the issuer payment of principal plus accrued interest upon a
                 specified number of days' notice.
                    
                 Derivative securities represent the purchaser's right to re-
                 ceive principal and interest payments from underlying munici-
                 pal bonds, general obligation municipal bonds or municipal
                 notes. A Portfolio may purchase a derivative security from
                 another portfolio within the Vanguard Group, as permitted by
                 the Investment Company Act of 1940 and applicable rules
                 thereunder, or from an outside financial institution. There
                 are different derivative structures. An example of the steps
                 involved in creating and using a derivative structure fol-
                 lows: 1) a depositor places the underlying Florida municipal
                 security into a trust supervised by an independent party; 2)
                 a financial institution provides the purchasers the right, at
                 periodic intervals, to tender the derivative security; 3) the
                 financial institution receives the difference between the
                 prevailing short-term interest rate (which is paid to the
                 portfolio holding the derivative security) and the coupon on
                 the underlying Florida municipal security in consideration
                 for providing the tender option; and 4) the tender option may
                 be discontinued upon the occurrence of certain events, in
                 which case, the portfolio of the derivative security should
                 receive its proportional share of the underlying Florida mu-
                 nicipal security. The primary risks associated with the use
                 of derivative securities are: certain interest rate risks
                 discussed under "Investment Risks," the possibility of a tax
                 law ruling which affects the status of the state or federal
                 opinions which are necessary to support the issuance of a de-
                 rivative security, and the possible lack of a liquid second-
                 ary market.     
 
 
                                                                               9
<PAGE>
 
                    
                 The Portfolios intend to limit the risk of derivative securi-
                 ties through policies that restrict the maximum amount of a
                 Portfolio's overall market risk that can be tolerated. Hence,
                 derivative securities' contributions to overall market risk
                 will be restricted, such that the risk/return characteristics
                 of the portfolios will be fully representative of their broad
                 maturity guidelines.     
 
THE FUND MAY     The Fund is authorized to invest up to 20% of its assets in
INVEST IN AMT    so-called "AMT" bonds. AMT bonds are tax-exempt "private ac-
BONDS            tivity" bonds issued after August 7, 1986, whose proceeds are
                 directed at least in part to a private, for-profit organiza-
                 tion. While the income from AMT bonds is exempt from regular
                 federal income tax, it is a tax preference item for purposes
                 of the alternative minimum tax. The alternative minimum tax
                 is a special separate tax that applies to a limited number of
                 taxpayers who have certain adjustments to income or tax pref-
                 erence items.
 
THE FUND MAY     The Fund may utilize bond futures contracts and options to a
USE FUTURES      limited extent. Specifically, the Fund may enter into futures
CONTRACTS AND    contracts provided that not more than 5% of its assets are
OPTIONS          required as a futures contract deposit; in addition, the Fund
                 may enter into futures contracts and options transactions
                 only to the extent that obligations under such contracts or
                 transactions represent not more than 20% of the Fund's as-
                 sets.
 
                 Futures contracts and options may be used for several rea-
                 sons: to maintain cash reserves while simulating full invest-
                 ment, to facilitate trading, to reduce transaction costs, or
                 to seek higher investment returns when a futures contract is
                 priced more attractively than the underlying municipal secu-
                 rity or index. The Fund may not use futures contracts or op-
                 tions transactions to leverage its assets.
 
                 For example, in order to simulate full investment in bonds
                 while maintaining liquidity to meet potential shareholder re-
                 demptions, the Fund may invest a portion of its assets in a
                 bond futures contract. Because futures contracts only require
                 a small initial margin deposit, the Fund would then be able
                 to maintain a cash reserve to meet potential redemptions,
                 while at the same time remaining fully invested. Also, be-
                 cause the transaction costs of futures and options may be
                 lower than the costs of investing in bonds directly, it is
                 expected that the use of futures contracts and options may
                 reduce the Fund's total transaction costs.
 
FUTURES          The primary risks associated with the use of futures and op-
CONTRACTS AND    tions are: (i) imperfect correlation between the change in
OPTIONS POSE     market value of the bonds held by the Fund and the prices of
CERTAIN RISKS    futures and options; and (ii) possible lack of a liquid sec-
                 ondary market for a futures contract and the resulting in-
                 ability to close a futures position prior to its maturity
                 date. The risk of imperfect correlation will be minimized by
                 investing in those contracts whose price fluctuations are ex-
                 pected to resemble those of the Fund's underlying securities.
                 The risk that the Fund will be unable to close out a futures
                 position will be minimized by entering into such transactions
                 on a national exchange with an active and liquid secondary
                 market. In general, the futures market is more liquid than
                 the municipal
 
10
<PAGE>
 
                 bond market; therefore, the Fund's liquidity may be improved
                 by investing in futures.
                    
                 The risk of loss in trading futures contracts in some strate-
                 gies can be substantial, due both to the low margin deposits
                 required, and the extremely high degree of leverage involved
                 in futures pricing. As a result, a relatively small price
                 movement in a futures contract may result in immediate and
                 substantial loss (or gain) to the investor. When investing in
                 future contracts, a Fund will segregate cash or cash equiva-
                 lents in the amount of the underlying obligation.     
 
IN UNUSUAL       Although it does not expect to do so, except in unusual cir-
CIRCUMSTANCES,   cumstances, the Fund may invest up to 20% of its assets in
THE FUND MAY     the following non-tax-exempt securities: obligations of the
INVEST IN        United States Government and its agencies or instrumentali-
TAXABLE          ties; commercial paper, bank certificates of deposit, and
SECURITIES       bankers' acceptances; and repurchase agreements collateral-
                 ized by these securities. Repurchase agreements having matu-
                 rities of more than seven days will be limited to 5% of net
                 assets. However, any securities held by the Fund which are
                 not exempt under the Florida intangible property tax could
                 result in all or a portion of the value of the Fund's shares
                 being subject to that tax. This would only occur if the Fund
                 held such securities on the annual assessment date and it is
                 the intention of the Fund to avoid such tax consequences. See
                 "Dividends, Capital Gains and Taxes" for a discussion of the
                 Florida intangible property tax.
 
THREE TYPES OF      
INSURANCE MAY    To provide an added level of credit protection, the Fund pur-
BE USED BY THE   chases securities which have one of the following types of
FUND             insurance: new issue, mutual fund and secondary market insur-
                 ance. A new issue insurance policy is purchased by a bond is-
                 suer who wishes to increase the credit rating of a security.
                 By paying a premium and meeting the insurer's underwriting
                 standards, the bond issuer is able to obtain a high credit
                 rating for the security (usually Aaa from Moody's or AAA from
                 Standard & Poor's). New issue insurance policies are non-
                 cancellable and continue in force as long as the bonds are
                 outstanding.     
 
                 A mutual fund insurance policy may be used to guarantee spe-
                 cific bonds only while owned by a mutual fund. The Fund has
                 obtained a mutual fund insurance policy from Financial Guar-
                 anty Insurance Company ("Financial Guaranty"), a AAA-rated
                 insurance company. Based upon the expected composition of the
                 Fund, the annual premiums for the policy are likely to range
                 from 0.10% to 0.40% of the principal value of the bonds in-
                 sured under the policy, thereby reducing the Fund's current
                 yield.
 
                 A secondary market insurance policy is purchased by an in-
                 vestor (such as the Fund) subsequent to the bond's original
                 issuance and generally insures a particular bond for the re-
                 mainder of its term. The Fund may purchase bonds which have
                 already been insured under a secondary market insurance pol-
                 icy by a prior investor, or the Fund may itself purchase such
                 a policy from Financial Guaranty for bonds that are currently
                 uninsured.
 
                                                                              11
<PAGE>
 
 
                 An insured municipal bond in the Fund will typically be cov-
                 ered by only one of the three policies. For instance, if a
                 bond is already covered by a new issue insurance policy or a
                 secondary market insurance policy, then that security will
                 not be insured under the Fund's mutual fund insurance policy.
                 All of the insurance policies used by the Fund will be ob-
                 tained only from companies whose insurance claims-paying
                 ability is rated Aaa by Moody's or AAA by Standard & Poor's.
 
THE FUND MAY     The Fund observes strict maturity guidelines as set forth in
REPORT AN        detail under "Investment Policies." These maturity standards
EFFECTIVE        are specified in terms of the Fund's average weighted maturi-
AVERAGE          ty. From time to time, however, the Fund may also report an
WEIGHTED         effective average weighted maturity, which reflects, among
MATURITY         other items, the likelihood that a municipal bond or note
                 held by the Fund may be redeemed or "called" prior to its
                 stated maturity date. For example, if the Fund consists en-
                 tirely of 20-year bonds, some of which may be "called" prior
                 to their stated maturity in 20 years, the Fund's average
                 weighted maturity will be 20 years, while its effective aver-
                 age maturity will be shorter.
                    
                 The Fund's effective average weighted maturity will be influ-
                 enced by bond market conditions, and so may vary from day to
                 day, even if no change has been made to the Fund's underlying
                 investment securities. For example, if interest rates de-
                 cline, a greater proportion of the Fund's securities may be
                 subject to call (redemption) prior to their stated maturity.
                 As a result, reflecting this increased call risk, the effec-
                 tive average maturity of the Fund will shorten, independent
                 of actual purchases or sales of portfolio securities.     
 
TEMPORARY        The Fund will not invest in securities other than municipal
INVESTMENTS      bonds except that the Fund may make investments for temporary
                 defensive purposes in (a) notes issued by or on behalf of mu-
                 nicipal or corporate issuers, obligations of the U.S. Govern-
                 ment and its agencies, commercial paper, bank certificates of
                 deposit; (b) investment companies investing in such securi-
                 ties which have investment objectives consistent with those
                 of the Portfolio to the extent permitted by the Investment
                 Company Act of 1940; and (c) any such securities or municipal
                 bonds subject to repurchase agreements.
 
THE FUND MAY     The Fund may invest up to 20% of its assets under normal cir-
PURCHASE WHEN-   cumstances in tax-exempt securities that are purchased on a
ISSUED           "when-issued" basis. In buying "when-issued" securities, the
SECURITIES       Fund commits to buy securities at a certain price even though
                 the securities may not be delivered for up to 45 days. The
                 Fund pays for the securities and begins earning interest when
                 the securities are actually delivered. As a consequence, it
                 is possible that the market price of the securities at the
                 time of delivery may be higher or lower than the purchase
                 price.
 
THE FUND MAY        
LEND ITS         The Fund may lend its investment securities for either short-
SECURITIES       term or long-term purposes to qualified institutional invest-
                 ors for the purpose of realizing additional net investment
                 income. Loans of securities by a Fund will be collateralized
                 by cash, letters of credit, or securities issued or guaran-
                 teed by the U.S. Government or its agencies. The collateral
                 will equal at least 100% of the cur     
 
12
<PAGE>
 
                 rent market value of the loaned securities. Income derived
                 from the lending of securities is not tax-exempt, and a por-
                 tion of the tax-exempt interest earned when a municipal secu-
                 rity is on loan must be characterized as taxable income.
                 Therefore, the Fund will limit such activity in accordance
                 with its investment objective.
   
THE FUND MAY     Each Portfolio may purchase municipal lease obligations,
INVEST IN        which are securities issued by state and local governments to
MUNICIPAL        acquire land, equipment and facilities. These obligations
LEASE            typically are not backed by the issuing municipality's full
OBLIGATIONS      authority to assess taxes to meet its debt obligations. If
                 the issuing authority fails to make the appropriations neces-
                 sary to cover lease payments, then the lease may terminate,
                 with the possibility of default on the lease obligation and
                 loss to investors.     
 
PORTFOLIO        Although it generally seeks to invest for the long term, the
TURNOVER IS      Fund retains the right to sell securities irrespective of how
NOT EXPECTED     long they have been held. It is anticipated that the annual
TO EXCEED 150%   portfolio turnover of the Fund will not exceed 150%. A turn-
                 over rate of 150% would occur, for example, if all of the se-
                 curities of the Fund were replaced within eight months.
- --------------------------------------------------------------------------------
                 The Fund has adopted certain limitations designed to reduce
INVESTMENT       its exposure to specific situations. These limitations in-
LIMITATIONS      clude the following:     

THE FUND HAS     a) The Fund will invest a minimum of 80% of its net assets in
ADOPTED             insured Florida municipal bonds. The interest on such
CERTAIN             bonds is exempt from federal personal income, and such
FUNDAMENTAL         bonds are also exempt from the Florida intangible personal
LIMITATIONS         property tax except that the Fund may make temporary in-
                    vestments as described above.
 
                 b) At the close of each quarter of the taxable year, the Fund
                    will limit the aggregate value of all holdings, except
                    U.S. Government and cash items, as defined in the Internal
                    Revenue Code (the "Code"), each of which exceeds 5% of the
                    Fund's total assets, to an aggregate amount of 50% of such
                    assets.
 
                 c) The Fund will limit the aggregate value of holdings of a
                    single issuer (except U.S. Government and cash items as
                    defined in the Code) to a maximum of 25% of the Fund's
                    total assets. For the purposes of this limitation,
                    identification of the issuer will be based on a
                    determination of the source of assets and revenues
                    committed to meeting interest and principal payments on
                    each security.
 
                 d) The Fund will not borrow money except for temporary or
                    emergency purposes, and then not in excess of 10% of the
                    Fund's total assets. The Fund will repay all borrowings
                    before making additional investments, and the interest
                    paid on such borrowings will reduce income.
 
                 e) The Fund will not pledge, mortgage, or hypothecate more
                    than 10% of its total assets.
 
                                                                              13
<PAGE>
 
 
                 These investment limitations are considered at the time in-
                 vestment securities are purchased. The limitations described
                 here and in the Statement of Additional Information may be
                 changed only with the approval of a majority of the Fund's
                 shareholders.
- --------------------------------------------------------------------------------
    
MANAGEMENT OF    The Fund is a member of The Vanguard Group of Investment Com-
THE FUND         panies, a family of 32 investment companies with 77 distinct
                 investment portfolios and total assets in excess of $120 bil-
                 lion. Through their jointly owned subsidiary, The Vanguard
VANGUARD         Group, Inc. ("Vanguard"), the Fund and the other funds in the
ADMINISTERS      Group obtain at cost virtually all of their corporate manage-
AND              ment, administrative, shareholder accounting and distribution
DISTRIBUTES      services. Vanguard also provides investment advisory services
THE FUND         on an at-cost basis to certain Vanguard funds. As a result of
                 Vanguard's unique corporate structure, the Vanguard funds
                 have costs substantially lower than those of most competing
                 mutual funds. In 1993, the average expense ratio (annual
                 costs including advisory fees divided by total net assets)
                 for the Vanguard funds amounted to approximately .30% com-
                 pared to an average of 1.02% for the mutual fund industry
                 (data provided by Lipper Analytical Services).     
                    
                 The Officers of the Fund manage its day to day operations and
                 are responsible to the Fund's Trustees. The Trustees set
                 broad policies for the fund and choose its Officers. A list
                 of Trustees and Officers of the fund and a statement of their
                 present positions and principal occupations during the past
                 five years can be found in the Statement of Additional Infor-
                 mation.     
                    
                 Vanguard employs a supporting staff of management and admin-
                 istrative personnel needed to provide the requisite services
                 to the funds and also furnishes the funds with necessary of-
                 fice space, furnishings and equipment. Each fund pays its
                 share of Vanguard's total expenses, which are allocated among
                 the funds under methods approved by the Board of Trustees
                 (Directors) of each fund. In addition, each fund bears its
                 own direct expenses, such as legal, auditing and custodian
                 fees.     
                    
                 Vanguard also provides distribution and marketing services to
                 the Vanguard funds. The funds are available on a no-load ba-
                 sis (i.e., there are no sales commissions or 12b-1 fees).
                 However, each fund bears its share of the Group's distribu-
                 tion costs.     
- --------------------------------------------------------------------------------
 
14
<PAGE>
 
    
INVESTMENT       The Fund receives all investment advisory services on an at-
ADVISER          cost basis from Vanguard's Fixed Income Group. The Group also
                 provides investment advisory services to 34 other Vanguard
                 money market and bond portfolios, both taxable and tax-ex-
VANGUARD         empt. Total assets under management by Vanguard's Fixed In-
MANAGES THE      come Group were $52 billion as of December 31, 1993. The
FUND'S           Fixed Income Group is supervised by the Officers of the Fund.
INVESTMENTS      Ian A. MacKinnon, Senior Vice President of Vanguard, has been
                 in charge of the Group since its inception in 1981.     
                    
                 . Reid Smith, Assistant Vice President of Vanguard, serves as
                   portfolio manager of the Florida Insured Tax-Free Fund. Mr.
                   Smith has managed the Fund since its inception in 1992. For
                   3 years prior to joining Vanguard, Mr. Smith was associated
                   with another mutual fund advisory firm as a fixed income
                   portfolio manager.     
 
                 The Fixed Income Group manages the investment and reinvest-
                 ment of the assets of the Fund and continuously reviews, su-
                 pervises and administers the Fund's investment program, sub-
                 ject to the maturity and quality standards specified in this
                 Prospectus and supplemental guidelines approved by the Fund's
                 Board of Trustees. The Fixed Income Group's selection of in-
                 vestments is based on: (a) continuing credit analysis of
                 those instruments held in the Fund and those being considered
                 for inclusion therein; (b) possible disparities in yield re-
                 lationships between different fixed-income securities; and
                 (c) actual or anticipated movements in the general level of
                 interest rates.
 
                 Vanguard's Fixed Income Group places all orders for purchases
                 and sales of portfolio securities. Purchases of portfolio se-
                 curities are made either directly from the issuer or from mu-
                 nicipal securities dealers. The Fixed Income Group may sell
                 portfolio securities prior to their maturity if circumstances
                 and considerations warrant and if it believes such disposi-
                 tions advisable. The Fixed Income Group seeks to obtain the
                 best available net price and most favorable execution for all
                 portfolio transactions.
- --------------------------------------------------------------------------------
                
DIVIDENDS,       Dividends consisting of virtually all of the ordinary income
CAPITAL GAINS    of the Fund are declared daily and are payable to sharehold-
AND TAXES        ers of record at the close of the previous business day. Such
                 dividends are paid on the first business day of each month.
THE FUND PAYS    Net capital gains distributions, if any, will be made annual-
MONTHLY          ly.      
DIVIDENDS      
                    
                 Dividend and capital gains distributions may be automatically
                 reinvested or received in cash. See "Choosing a Distribution
                 Option" for a description of these distributions methods.
                     
                 In addition, in order to satisfy certain distribution re-
                 quirements of the Tax Reform Act of 1986, the Fund may de-
                 clare special year-end dividend and capital gains distribu-
                 tions during December. Such distributions, if received by
                 shareholders by January 31, are deemed to have been paid by
                 the Fund and received by shareholders by December 31 of the
                 prior year.
 
                                                                              15
<PAGE>
 
 
   
DIVIDENDS WILL   The Fund intends to continue to qualify for taxation as a
BE EXEMPT FROM   "regulated investment company" under the Internal Revenue
FEDERAL INCOME   Code so that it will not be subject to federal income tax to
TAXES            the extent its income is distributed to shareholders. In ad-
                 dition, the Fund intends to invest a sufficient portion of
                 its assets in municipal bonds and notes so that it will qual-
                 ify to pay "exempt-interest dividends" to shareholders. Such
                 exempt-interest dividends are excluded from a shareholder's
                 gross income for federal income tax purposes. The Revenue
                 Reconciliation Act enacted during 1993 provides that market
                 discount on tax-exempt bonds purchased after April 30, 1993
                 must be taxed as ordinary income. Accordingly, to the extent
                 that the Fund purchases such discounted securities, taxable
                 income may result.     
 
   
FUND SHARES      Although Florida does not have a state personal income tax,
WILL BE EXEMPT   it does impose an intangible personal property tax on certain
FROM THE         financial assets, including shares of mutual funds. Unlike
FLORIDA          other state and local taxes, which are assessed on ordinary
INTANGIBLE TAX   income and capital gains derived from mutual fund shares, the
                 Florida intangible personal property tax is based on the net
                 asset value of shares owned as of December 31.     
 
                 Under Florida law, shares of a mutual fund will be exempt
                 from the intangibles tax to the extent that, on the annual
                 assessment date (January 1), its assets are solely invested
                 in certain exempt Florida securities, U.S. Government securi-
                 ties, certain short-term cash investments, or other exempt
                 securities. If, on the annual assessment date (January 1),
                 the Fund's assets are invested in both tax-exempt and non-
                 tax-exempt securities, only that portion of a share's net as-
                 set value represented by U.S. Government securities (includ-
                 ing qualifying obligations of U.S. territories and posses-
                 sions) will be exempt from the intangibles tax. Because the
                 Fund is expected to invest only in exempt Florida municipal
                 obligations (and certain short-term cash investments), shares
                 of the Fund will be exempt from the Florida intangible per-
                 sonal property tax for Florida residents.
 
                 However, under unusual circumstances, the Fund may invest in
                 securities other than Florida municipal obligations. In such
                 cases, all or a portion of the value of the Fund's shares may
                 be subject to the Florida intangible personal property tax,
                 and a portion of the Fund's income may be subject to federal
                 income taxes.
 
                 Net long-term capital gains realized by the Fund from the
                 sale of securities will be distributed as taxable capital
                 gains distributions. Any short-term capital gains or any tax-
                 able interest income will be distributed as a taxable ordi-
                 nary dividend distribution. In general, such taxable income
                 distributions from the Fund are expected to be negligible in
                 comparison with tax-exempt dividends.
 
                 At present, the Fund does not invest in AMT bonds. (See "In-
                 vestment Policies.") However, were the Fund to invest in such
                 bonds, a portion of the Fund's dividends, while exempt from
                 the regular federal income tax, would be a tax preference
                 item for purposes of the alternative minimum tax.
 
16
<PAGE>
 
 
   
A CAPITAL GAIN   A sale of the Fund's shares is a taxable event and may result
OR LOSS MAY BE   in a capital gain or loss. A capital gain or loss may be re-
REALIZED UPON    alized from an ordinary redemption of shares, a check writing
EXCHANGE OR      redemption, or an exchange of shares between two mutual funds
REDEMPTION       (or two portfolios of a mutual fund). In addition, if you
                 held shares in the Fund for six months or less, any capital
                 loss realized upon redemption is disallowed to the extent of
                 the tax-exempt dividend income you received.     
 
                 Capital gains distributions from the Fund and any capital
                 gains or losses realized from the sale or exchange of shares
                 may also be subject to state and local taxes.
 
                 The Fund is required to withhold 31% of any taxable divi-
                 dends, capital gains distributions, and redemptions paid to
                 shareholders who have not complied with IRS taxpayer identi-
                 fication regulations. You may avoid this withholding require-
                 ment by indicating your proper Social Security or Taxpayer
                 Identification Number on your Account Registration Form and
                 by certifying that you are not subject to backup withholding.
 
                 Up to 50% of an individual's Social Security benefits may be
                 subject to federal income tax. Along with other factors, to-
                 tal tax-exempt income, including any tax-exempt dividend in-
                 come from the Fund, is used to calculate the taxable portion
                 of Social Security benefits.
                    
                 The Fund is organized as a Pennsylvania business trust and,
                 in the opinion of counsel, is not liable for any income or
                 franchise tax in the Commonwealth of Pennsylvania. However,
                 legislation has been introduced in the Pennsylvania legisla-
                 ture which, if enacted, could subject the Fund to such taxes.
                 The Fund will be subject to Pennsylvania county personal
                 property tax in the county which is the site of its principal
                 office.     
 
                 The tax discussion set forth above is included for general
                 information only. Prospective investors should consult their
                 own tax advisers concerning the tax consequences of an in-
                 vestment in the Fund.
- --------------------------------------------------------------------------------
     
THE SHARE        The share price or "net asset value" per share of the Fund is
PRICE OF THE     computed daily by dividing the total value of the investments
FUND             and other assets of the Fund, less any liabilities, by the
                 total outstanding shares of the Fund. The net asset value per
                 share of the Fund is determined as of the close of regular
                 trading on The New York Stock Exchange (generally 4:00 p.m.
                 Eastern time) on each day the Exchange is open.     
 
                 When approved by the Board of Trustees, bonds and other
                 fixed-income securities of the Fund may be valued on the ba-
                 sis of prices provided by a pricing service when such prices
                 are believed to reflect the fair market value of such securi-
                 ties. (The prices provided by pricing services are generally
                 determined without regard to bid or last sale prices. Because
                 of the large number of outstanding municipal bonds, the ma-
                 jority of issues do not trade each day; therefore, last sale
                 prices are not normally available. In valuing such securi-
                 ties, the
 
                                                                              17
<PAGE>
 
                 pricing services generally take into account institutional
                 size trading in similar groups of securities and any develop-
                 ments related to specific securities.) The methods used by
                 the pricing service and the valuations so established are re-
                 viewed by the Officers of the Fund under the general supervi-
                 sion of the Trustees. There are a number of pricing services
                 available and the Trustees, on the basis of ongoing evalua-
                 tion of these services, may use other pricing services or
                 discontinue the use of any pricing service.
 
                 Valuation of securities not priced in this manner are priced
                 at the most recent quoted bid price provided by investment
                 dealers. Short-term instruments maturing within 60 days of
                 the valuation date may be valued at cost, plus or minus any
                 amortized discount or premium. Other assets and securities
                 for which no quotations are readily available will be valued
                 in good faith at their fair value using methods determined by
                 the Trustees.
 
                 The price per share of the Fund can be found daily in the mu-
                 tual fund section of most major newspapers under the heading
                 of The Vanguard Group.
- --------------------------------------------------------------------------------
GENERAL          Vanguard Florida Insured Tax-Free Fund is a Pennsylvania
INFORMATION      business trust. The Declaration of Trust permits the Trustees
                 to issue an unlimited number of shares of beneficial inter-
                 est, without par value, from an unlimited number of classes
                 of shares. Currently, the Fund is offering one class of
                 shares.
 
                 Shares of the Fund when issued are fully paid and non-assess-
                 able; participate equally in dividends, distributions and net
                 assets; are entitled to one vote per share; have pro rata
                 liquidation rights; and do not have pre-emptive rights. Also,
                 shares of the Fund have non-cumulative voting rights, meaning
                 that the holders of more than 50% of the shares voting for
                 the election of the Trustees can elect all of the Trustees if
                 they so choose.
 
                 Annual meetings of shareholders will not be held except as
                 required by the Investment Company Act of 1940 and other ap-
                 plicable law. An annual meeting will be held to vote on the
                 removal of a Trustee or Trustees of the Fund if requested in
                 writing by the holders of not less than 10% of the outstand-
                 ing shares of the Fund.
 
                 All securities and cash are held by CoreStates Bank, N.A.,
                 Philadelphia, PA. The Vanguard Group, Inc., Valley Forge, PA,
                 serves as the Fund's Transfer and Dividend Disbursing Agent.
                 Price Waterhouse serves as independent accountants for the
                 Fund and will audit its financial statements annually. The
                 Fund is not involved in any litigation.
- --------------------------------------------------------------------------------
 
18
<PAGE>
 
                               SHAREHOLDER GUIDE
 
                    
OPENING AN       To open a new account, either by mail or by wire, simply com-
ACCOUNT AND      plete and return an Account Registration Form and any re-
PURCHASING       quired legal documentation. Please indicate the amount you
SHARES           wish to invest. Your purchase must be equal to or greater
                 than the $3,000 minimum initial investment requirement ($500
                 for Uniform Gifts/Transfers to Minors Act accounts). In addi-
                 tion, you must be a Florida resident to invest in the Fund.
                 If you need assistance with the Account Registration Form or
                 have any questions about this Fund, please call our Investor
                 Information Department at 1-800-662-7447. NOTE: For other
                 types of account registrations (e.g. corporations, associa-
                 tions, other organizations, trusts or powers of attorney),
                 please call us to determine which additional forms you may
                 need.     
                    
                 Because of the risks associated with bond investments, the
                 Fund is intended to be a long-term investment vehicle and is
                 not designed to provide investors with a means of speculating
                 on short-term market movements. Consequently the Fund re-
                 serves the right to reject any specific purchase (and ex-
                 change purchase) request. The Fund also reserves the right to
                 suspend the offering of shares for a period of time.     
 
                 The Fund's shares are purchased at the next-determined net
                 asset value after your investment has been received in the
                 form of Federal Funds. See "When Your Account Will Be Credit-
                 ed". The Fund is offered on a no-load basis (i.e., there are
                 no sales commissions or 12b-1 fees).
                    
ADDITIONAL       Subsequent investments may be made by mail ($100 minimum),
INVESTMENTS      wire ($1,000), exchange from another Vanguard Fund account
                 ($100 minimum), or Vanguard Fund Express.     
                 --------------------------------------------------------------
                                                    ADDITIONAL INVESTMENTS
                        NEW ACCOUNT                  TO EXISTING ACCOUNTS
             
PURCHASING BY    Please include the            Additional investments should
MAIL Complete    amount of your initial        include the Invest-by-Mail re-
and sign the     investment on the             mittance form attached to your
enclosed         registration form,            Fund confirmation statements.
Account          make your check               Please make your check payable
Registration     payable to The                to The Vanguard Group-18, write
Form             Vanguard Group-18, and        your account number on your
                 mail to:                      check and, using the return en-
                                               velope provided, mail to the
                 VANGUARD FINANCIAL CENTER     address indicated on the In-
                 P.O. BOX 2600                 vest-by-Mail Form.      
                 VALLEY FORGE, PA 19482  
                               
For express or   VANGUARD FINANCIAL CENTER     All written requests should be  
registered       455 DEVON PARK DRIVE          mailed to one of the addresses  
mail, send to:   WAYNE, PA 19087               indicated for new accounts. Do  
                                               not send registered or express  
                                               mail to the post office box     
                                               address.                        
                                                                               
                 --------------------------------------------------------------
 
                                                                              19
<PAGE>

     
                            
PURCHASING BY               CORESTATES BANK, N.A.   
WIRE Money                  ABA 031000011           
should be                   CORESTATES NO. 0141 1274
wired to:                   ATTN VANGUARD            
                            VANGUARD FLORIDA INSURED TAX-FREE FUND
BEFORE WIRING               ACCOUNT NUMBER
Please contact              ACCOUNT REGISTRATION 
Client          
Services (1-    
800-662-2739)      
                
                    
                 To assure proper receipt, please be sure your bank includes
                 the name of the Fund, the account number Vanguard has as-
                 signed to you and the eight digit CoreStates number. If you
                 are opening a new account, please complete the Account Regis-
                 tration Form and mail it to the "New Account" address above
                 after completing your wire arrangement. Note: Federal Funds
                 wire purchase orders will be accepted only when the Fund and
                 Custodian Bank are open for business.     
- --------------------------------------------------------------------------------
    
PURCHASING BY    You may open an account or purchase additional shares by mak-
EXCHANGE (from   ing an exchange from an existing Vanguard Fund account. Call
a Vanguard       our Client Services Department at 1-800-662-2739. The new ac-
account)         count will have the same registration as the existing ac-
                 count. However, the Fund reserves the right to refuse any ex-
                 change purchase request.     
- --------------------------------------------------------------------------------
   
PURCHASING BY    The Fund Express Special Purchase option lets you move money
FUND EXPRESS     from your bank account to your Vanguard account at your re-
                 quest. Or if you choose the Automatic Investment option,
Special          money will be moved from your bank account to your Vanguard
Purchase and     account on the schedule (monthly, bimonthly [every other
Automatic        month], quarterly or yearly) you select. To establish these
Investment       Fund Express options, please provide the appropriate informa-
                 tion on the Account Registration Form. We will send you a
                 confirmation of your Fund Express service; please wait three
                 weeks before using the service.     
- --------------------------------------------------------------------------------
CHOOSING A       You must select one of three distribution options:
DISTRIBUTION
OPTION           1. AUTOMATIC REINVESTMENT OPTION--Both dividends and capital  
                  gains distributions will be reinvested in additional Fund    
                  shares. This option will be selected for you automatically   
                  unless you specify one of the other options.                 
                                                                               
                 2. CASH DIVIDEND OPTION--Your dividends will be paid in cash  
                    and your capital gains will be reinvested in additional    
                    Fund shares.                                               
                                                                               
                 3. ALL CASH OPTION--Both dividend and capital gains distribu- 
                    tions will be paid in cash.                                
                                                                               
                 You may change your option by calling our Client Services De- 
                 partment (1-800-662-2739).                                    
                                                                               
                 In addition, an option to invest your cash dividends and/or   
                 capital gains distributions in another Vanguard Fund account  
                 is available. Please call our Client Services Department (1-  
                 800-662-2739) for information. You may also elect              
                 
                 
 
20
<PAGE>
 
                    
                 Vanguard Dividend Express which allows you to transfer your
                 cash dividends and/or capital gains distributions automati-
                 cally to your bank account. Please see "Other Vanguard Serv-
                 ices" for more information.     
- --------------------------------------------------------------------------------
                 
TAX CAUTION      Under Federal tax laws, the Fund is required to distribute
                 net capital gains and investment income to Fund shareholders.
INVESTORS        These distributions are made to all shareholders who own Fund
SHOULD ASK       shares as of the distribution's record date, regardless of
ABOUT THE        how long the shares have been owned. Purchasing shares just
TIMING OF        prior to the record date could have a significant impact on
CAPITAL GAINS    your tax liability for the year. For example, if you purchase
AND DIVIDEND     shares immediately prior to the record date of a sizable cap-
DISTRIBUTIONS    ital gain or income dividend distribution, you will be as-
BEFORE           sessed taxes on the amount of the capital gain and/or divi-
INVESTING        dend distribution later paid even though you owned the Fund
                 shares for just a short period of time. (Taxes are due on the
                 distributions even if the dividend or gain is reinvested in
                 additional Fund shares.) While the total value of your in-
                 vestment will be the same after the distribution--the amount
                 of the distribution will offset the drop in the NAV of the
                 shares--you should be aware of the tax implications the tim-
                 ing of your purchase may have.     
                    
                 Prospective investors should, therefore, inquire about poten-
                 tial distributions before investing. The Fund's annual capi-
                 tal gains distribution normally occurs in December, while in-
                 come dividends are generally paid on the first business day
                 of each month. For additional information on distributions
                 and taxes, see the section titled "Dividends, Capital Gains,
                 and Taxes."     
- --------------------------------------------------------------------------------
           
IMPORTANT        The easiest way to establish optional Vanguard services on
INFORMATION      your account is to select the options you desire when you
                 complete your Account Registration Form. If you wish to add
ESTABLISHING     shareholder options later, you may need to provide Vanguard
OPTIONAL         with additional information and a signature guarantee. Please
SERVICES         call our Client Services Department (1-800-662-2739) for
                 further assistance.      
 
SIGNATURE        For our mutual protection, we may require a signature guaran-
GUARANTEES       tee on certain written transaction requests. A signature
                 guarantee verifies the authenticity of your signature, and
                 may be obtained from banks, brokers and any other guarantor
                 that Vanguard deems acceptable. A SIGNATURE GUARANTEE CANNOT
                 BE PROVIDED BY A NOTARY PUBLIC.
 
CERTIFICATES     Share certificates will not be issued for the Fund.
 
BROKER-DEALER    If you purchase shares in Vanguard Funds through a registered
PURCHASES        broker-dealer or investment adviser, the broker-dealer or ad-
                 viser may charge a service fee.
 
CANCELLING       The Fund will not cancel any trade (e.g., a purchase, ex-
TRADES           change or redemption) believed to be authentic, received in
                 writing or by telephone, once the trade has been received.
- --------------------------------------------------------------------------------
 
                                                                              21
<PAGE>
 
WHEN YOUR        The trade date is the date on which your account is credited.
ACCOUNT WILL     It is generally the day on which the Fund receives your in-
BE CREDITED      vestment in the form of Federal Funds (monies credited to the
                 Fund's Custodian Bank by a Federal Reserve Bank). Your trade
                 date varies according to your method of payment for your
                 shares.
 
                 For purchases by check, the Fund is ordinarily credited with
                 Federal Funds within one business day. Thus, if your purchase
                 by check is received by the close of regular trading on the
                 New York Stock Exchange (generally 4:00 p.m. Eastern time),
                 your trade date is the business day following receipt of your
                 check. If your purchase is received after the close of the
                 Exchange, your trade date is the second business day follow-
                 ing receipt of your check.
 
                 For purchases by Federal Funds wire or exchange, the Fund is
                 credited immediately with Federal Funds. Thus, if your pur-
                 chase by Federal Funds wire or exchange is received by the
                 close of the Exchange, your trade date is the day of receipt.
                 If your purchase is received after the close of the Exchange,
                 your trade date is the business day following receipt of your
                 wire or exchange.
 
                 Your shares are purchased at the net asset value determined
                 on your trade date. You will begin to earn dividends on the
                 calendar day following the trade date. (For a Friday trade
                 date, you will begin earning dividends on Saturday.)
 
                 In order to prevent lengthy processing delays caused by the
                 clearing of foreign checks, Vanguard will only accept a for-
                 eign check which has been drawn in U.S. dollars and has been
                 issued by a foreign bank with a U.S. correspondent bank.
 
                 The Fund reserves the right to suspend the offering of shares
                 for a period of time. The Fund also reserves the right to re-
                 ject any specific purchase request.
- --------------------------------------------------------------------------------
SELLING YOUR     You may withdraw any portion of the funds in your account by
SHARES           redeeming shares at any time. You may initiate a request by
                 writing or by telephoning. Your redemption proceeds are nor-
                 mally mailed, credited or wired--depending upon the method of
                 withdrawal you have PREVIOUSLY chosen--within two business
                 days after the receipt of the request in Good Order.
 
   
SELLING BY       You may withdraw funds from your account by writing a check
WRITING A        payable in the amount of $250 or more. When a check is pre-
CHECK            sented for payment to the Fund's agent, CoreStates Bank, the
                 Fund will redeem sufficient shares in your account at the
                 next determined net asset value to cover the amount of the
                 check.     
                    
                 In order to establish the checkwriting option on your ac-
                 count, all registered shareholders must sign a signature
                 card. After your completed signature card is received by the
                 Fund, an initial supply of checks will be mailed within 10
                 business days. There is no charge for checks or for their
                 clearance. CORPORATIONS, TRUSTS AND OTHER ORGANIZATIONS
                 SHOULD CALL OR WRITE OUR CLIENT SERVICES DEPARTMENT (1-800-
                 662-2739) BEFORE SUBMITTING SIGNATURE CARDS, AS ADDITIONAL
                 DOCUMENTS MAY BE REQUIRED TO ESTABLISH THE CHECKWRITING SERV-
                 ICE.     
 
22
<PAGE>
 
                 Before establishing the checkwriting option, you should be
                 aware that:
 
                 1. Writing a check (a redemption of shares) is a taxable
                    event.
                 2. The Fund does not allow an account to be closed through
                    the checkwriting option.
                 3. Vanguard cannot guarantee a stop payment on the
                    checkwriting option. If you wish to reverse a stop payment
                    order, you must do so in writing.
                 4. The Fund reserves the right to terminate or alter this
                    service at any time.
                 --------------------------------------------------------------
   
SELLING BY       Requests should be mailed to VANGUARD FINANCIAL CENTER, VAN-
MAIL             GUARD FLORIDA INSURED TAX-FREE FUND, P.O. BOX 1120, VALLEY
                 FORGE, PA 19482. (For express or registered mail, send your
                 request to Vanguard Financial Center, Vanguard Florida In-
                 sured Tax-Free Fund, 455 Devon Park Drive, Wayne, PA 19087.)
                     
                 The redemption price of shares will be the Fund's net asset
                 value next determined after Vanguard has received all re-
                 quired documents in Good Order.
                 --------------------------------------------------------------
DEFINITION OF    GOOD ORDER means that the request includes the following:
GOOD ORDER
 
                 1. The account number and Fund name.
                 2. The amount of the transaction (specified in dollars or
                    shares).
                 3. Signatures of all owners EXACTLY as they are registered on
                    the account.
                    
                 4. Any required signature guarantees.     
                 5. Other supporting legal documentation that might be re-
                    quired, in the case of estates, corporations, trusts, and
                    certain other accounts.
 
                 IF YOU HAVE QUESTIONS ABOUT THIS DEFINITION AS IT PERTAINS TO
                 YOUR REQUEST, PLEASE CALL OUR CLIENT SERVICES DEPARTMENT AT
                 1-800-662-2739.
                 --------------------------------------------------------------
   
SELLING BY       To sell shares by telephone, you or your pre-authorized
TELEPHONE        representative may call our Client Services Department at 1-
                 800-662-2739. For telephone redemptions, you may have the
                 proceeds sent to you either by mail or by wire. In addition
                 to the details below, please see "Important Information About
                 Telephone Transactions."     
 
                 BY MAIL: Telephone mail redemption is automatically estab-
                 lished on your account unless you indicate otherwise on your
                 Account Registration Form. You may redeem any amount by call-
                 ing Vanguard. The proceeds will be paid to the registered
                 shareholders and mailed to the address of record.
                    
                 BY WIRE: Telephone wire redemption must be specifically
                 elected for your account. The best time to elect telephone
                 wire redemption is at the time you complete your Account Reg-
                 istration Form. If you do not presently have telephone wire
                 redemption and wish to establish it, please contact our Cli-
                 ent Services Department.     
                    
                 With the wire redemption option, you may withdraw a minimum
                 of $1,000 and have the amount wired directly to your bank ac-
                 count. Wire redemptions less than $5,000 are subject to a $5
                 charge deducted by Vanguard. There is no     
 
                                                                              23
<PAGE>
 
                    
                 Vanguard charge for wire redemptions of $5,000 or more. How-
                 ever, your bank may assess a separate fee to accept incoming
                 wires.     
                    
                 A request to change the bank associated with your wire
                 redemption option must be received in writing, signed by each
                 registered shareholder, and accompanied by a voided check or
                 preprinted deposit slip. A signature guarantee is required if
                 your bank registration is not identical to your Vanguard Fund
                 account registration.     
                 --------------------------------------------------------------
                 If you select the Fund Express Automatic Withdrawal option,
SELLING BY       money will be automatically moved from your Vanguard Fund ac-
FUND EXPRESS     count to your bank account according to the schedule you have
                 selected. The Special Redemption option lets you move money
Automatic        from your Vanguard account to your bank account upon your re-
Withdrawal &     quest. You may elect Fund Express on the Account Registration
Special          Form or call our Investor Information Department at 1-800-
Redemption       662-7447 for a Fund Express application.      
                 --------------------------------------------------------------
   
SELLING BY       You may sell shares of the Fund by making an exchange to an-
EXCHANGE         other Vanguard Fund account. Please see "Exchanging Your
                 Shares" for details.     
                 --------------------------------------------------------------
   
IMPORTANT        Shares purchased by check or Fund Express may be redeemed at
REDEMPTION       any time. However, your redemption proceeds will not be paid
INFORMATION      until payment for the purchase is collected, which may take
                 up to ten calendar days. Your money is invested and earns
                 dividends during the holding period.     
                 --------------------------------------------------------------
DELIVERY OF      Redemption requests received by telephone prior to the close
REDEMPTION       of regular trading on the New York Stock Exchange (generally
PROCEEDS         4:00 p.m. Eastern time) are processed on the day of receipt
                 and the redemption proceeds are normally sent on the follow-
                 ing business day.
 
                 Redemption requests received by telephone after the close of
                 the Exchange are processed on the business day following re-
                 ceipt and the proceeds are normally sent on the second busi-
                 ness day following receipt.
 
                 Redemption proceeds must be sent to you within seven days of
                 receipt of your request in Good Order.
 
                 If you experience difficulty in making a telephone redemption
                 during periods of drastic economic or market changes, your
                 redemption request may be made by regular or express mail. It
                 will be implemented at the net asset value next determined
                 after your request has been received by Vanguard in Good Or-
                 der. The Fund reserves the right to revise or terminate the
                 telephone redemption privilege at any time.
 
                 The Fund may suspend the redemption right or postpone payment
                 at times when the New York Stock Exchange is closed or under
                 any emergency circumstances as determined by the United
                 States Securities and Exchange Commission.
                 --------------------------------------------------------------
 
24
<PAGE>
 
   
VANGUARD'S       If you make a redemption from a qualifying account, Vanguard
AVERAGE COST     will send you an Average Cost Statement which provides you
STATEMENT        with the tax basis of the shares you redeemed. Please see
                 "Other Vanguard Services" for additional information.     
                 --------------------------------------------------------------
MINIMUM             
ACCOUNT          Due to the relatively high cost of maintaining smaller ac-
BALANCE          counts, the Fund reserves the right to redeem shares in any
REQUIREMENT      account that is below the minimum initial investment amount
                 of $3,000. In addition, if at any time the total investment
                 does not have a value of at least $1,000, you may be notified
                 that the value of your account is below the Fund's minimum
                 account balance requirement. You would then be allowed 60
                 days to make an additional investment before the account is
                 liquidated. Proceeds would be promptly paid to the sharehold-
                 er.     
- --------------------------------------------------------------------------------
EXCHANGING       Should your investment goals change, you may exchange your
YOUR SHARES      shares of Vanguard Florida Insured Tax-Free Fund for those of
                 other available Vanguard Funds.
   
EXCHANGING BY    When exchanging shares by telephone, please have ready the
TELEPHONE        Fund name, account number, Social Security Number or Taxpayer
Call Client      Identification Number listed on the account, and account ad-
Services         dress. Requests for telephone exchanges received prior to the
(1-800-662-      close of regular trading on the New York Stock Exchange (gen-
2739)            erally 4:00 p.m. Eastern time) are processed at the close of
                 business that same day. Requests received after the close of
                 the Exchange are processed the next business day. TELEPHONE
                 EXCHANGES ARE NOT ACCEPTED INTO OR FROM VANGUARD BALANCED IN-
                 DEX, VANGUARD EXPLORER FUND, VANGUARD INDEX TRUST, VANGUARD
                 INTERNATIONAL EQUITY INDEX FUND--EUROPEAN AND PACIFIC PORTFO-
                 LIOS, AND VANGUARD QUANTITATIVE PORTFOLIOS.     
 
                 If you experience difficulty in making a telephone exchange,
                 your exchange request may be made by regular or express mail,
                 and it will be implemented at the closing net asset value on
                 the date received by Vanguard provided the request is re-
                 ceived in Good Order.
                 --------------------------------------------------------------
    
EXCHANGING BY    Please be sure to include on your exchange request the name
MAIL             and account number of your current Fund, the name of the Fund
                 you wish to exchange into, the account you wish to exchange,
                 and the signatures of all registered account holders. Send
                 your request to VANGUARD FINANCIAL CENTER, VANGUARD FLORIDA
                 INSURED TAX-FREE FUND, P.O. BOX 1120, VALLEY FORGE, PA 19482.
                 (For express or registered mail, send your request to Van-
                 guard Financial Center, Vanguard Florida Insured Tax-Free
                 Fund, 455 Devon Park Drive, Wayne, PA 19087.)     
                 --------------------------------------------------------------
IMPORTANT        Before you make an exchange, you should consider the follow-
EXCHANGE         ing:
INFORMATION   
                 . Please read the Fund's prospectus before making an ex-
                   change. For a copy and for answers to any questions you may
                   have, call our Investor Information Department (1-800-662-
                   7447).
 
                 . An exchange is treated as a redemption and a purchase.
                   Therefore, you could realize a taxable gain or loss on the
                   transaction.
 
                                                                              25
<PAGE>
 
                    
                 . Exchanges are accepted only if the registrations and the
                   Taxpayer Identification numbers of the two accounts are
                   identical.     
 
                 . The shares to be exchanged must be on deposit and not held
                   in certificate form.
                    
                 . New accounts are not currently accepted in Vanguard/Windsor
                   Fund.     
                 . The redemption price of shares redeemed by exchange is the
                   net asset value next determined after Vanguard has received
                   the required documents in Good Order.
 
                 . When opening a new account by exchange, you must meet the
                   minimum investment requirement of the new Fund.
 
                 Every effort will be made to maintain the exchange privilege.
                 However, the Fund reserves the right to revise or terminate
                 its provisions, limit the amount of or reject any exchange,
                 as deemed necessary, at any time.
- --------------------------------------------------------------------------------
EXCHANGE         The Fund's exchange privilege is not intended to afford
PRIVILEGE        shareholders a way to speculate on short-term movements in
LIMITATIONS      the market. Accordingly, in order to prevent excessive use of
                 the exchange privilege that may potentially disrupt the man-
                 agement of the Fund and increase transaction costs, the Fund
                 has established a policy of limiting excessive exchange ac-
                 tivity.
                    
                 Exchange activity generally will not be deemed excessive if
                 limited to TWO SUBSTANTIVE EXCHANGE REDEMPTIONS (AT LEAST 30
                 DAYS APART) from the Fund during any twelve month period.
                 Notwithstanding these limitations, the Fund reserves the
                 right to reject any purchase request (including exchange pur-
                 chases from other Vanguard Portfolios) that is reasonably
                 deemed to be disruptive to efficient portfolio management.
                     
- --------------------------------------------------------------------------------
   
IMPORTANT        The ability to initiate redemptions (except wire redemptions)
INFORMATION      and exchanges by telephone is automatically established on
ABOUT TELEPHONE  your account unless you request in writing that telephone
TRANSACTIONS     transactions on your account not be permitted. The ability to
                 initiate wire redemptions by telephone will be established on
                 your account only if you specifically elect this option in
                 writing.     
                    
                 To protect your account from losses resulting from unautho-
                 rized or fraudulent telephone instructions, Vanguard adheres
                 to the following security procedures:     
                    
                 1. SECURITY CHECK. To request a transaction by telephone, the
                   caller must know (i) the name of the Fund; (ii) the 10-
                   digit account number; (iii) the exact name in which the ac-
                   count is registered; and (iv) the Social Security or Tax-
                   payer Identification number listed on the account.     
                    
                 2. PAYMENT POLICY. The proceeds of any telephone redemption
                   by mail will be made payable to the registered shareowner
                   and mailed to the address of record, only. In the case of a
                   telephone redemption by wire, the wire transfer will be
                   made only in accordance with the shareowner's prior written
                   instructions.     
 
26
<PAGE>
 
                    
                 Neither the Fund nor Vanguard will be responsible for the au-
                 thenticity of transaction instructions received by telephone,
                 provided that reasonable security procedures have been fol-
                 lowed. Vanguard believes that the security procedures de-
                 scribed above are reasonable and that if such procedures are
                 followed, you will bear the risk of any losses resulting from
                 unauthorized or fraudulent telephone transactions on your ac-
                 count. If Vanguard fails to follow reasonable security proce-
                 dures, it may be liable for any losses resulting from unau-
                 thorized or fraudulent telephone transactions on your ac-
                 count.     
- --------------------------------------------------------------------------------
                    
TRANSFERRING     You may transfer the registration of any of your Fund shares
REGISTRATION     to another person by completing a transfer form and sending
                 it to: VANGUARD FINANCIAL CENTER, P.O. BOX 1110, VALLEY
                 FORGE, PA 19482, ATTENTION: TRANSFER DEPARTMENT. The request
                 must be in Good Order. BEFORE MAILING YOUR REQUEST, PLEASE
                 CALL OUR CLIENT SERVICES DEPARTMENT (1-800-662-2739) FOR FULL
                 INSTRUCTIONS.     
- --------------------------------------------------------------------------------
              
OTHER VANGUARD   For more information about any of these services, please call
SERVICES         our Investor Information Department at 1-800-662-7447.      
                    
STATEMENTS AND   Vanguard will send you a confirmation statement each time you
REPORTS          initiate a transaction in your account except for
                 checkwriting redemptions from Vanguard money market accounts.
                 You will also receive a comprehensive account statement at
                 the end of each calendar quarter. The fourth-quarter state-
                 ment will be a year-end statement, listing all transaction
                 activity for the entire calendar year.     
                    
                 Vanguard's Average Cost Statement provides you with the aver-
                 age cost of shares redeemed from your account, using the av-
                 erage cost single category method. This service is available
                 for most taxable accounts opened since January 1, 1986. In
                 general, investors who redeemed shares from a qualifying Van-
                 guard account may expect to receive their Average Cost State-
                 ment in February of the following year. Please call our Cli-
                 ent Services Department (1-800-662-2739) for information.
                     
                 Financial reports on the Fund will be mailed to you semi-an-
                 nually, according to the Fund's fiscal year-end.
 
VANGUARD DIRECT  With Vanguard's Direct Deposit Service, most U.S. Government
DEPOSIT SERVICE  checks (including Social Security and military pension
                 checks) and private payroll checks may be automatically de-
                 posited into your Vanguard Fund account. Separate brochures
                 and forms are available for direct deposit of U.S. Government
                 and private payroll checks.
 
VANGUARD         Vanguard's Automatic Exchange Service allows you to move
AUTOMATIC        money automatically among your Vanguard Fund accounts. For
EXCHANGE SERVICE instance, the service can be used to "dollar cost average"
                 from a money market portfolio into a stock or bond fund or to
                 contribute to an IRA or other retirement plan.
 
 
                                                                              27
<PAGE>
 
                 
VANGUARD FUND    Vanguard's Fund Express allows you to transfer money between
EXPRESS          your Fund account and your account at a bank, savings and
                 loan association, or a credit union that is a member of the
                 Automated Clearing House (ACH) system. You may elect this
                 service on the Account Registration Form or call our Investor
                 Information Department (1-800-662-7447) for a Fund Express
                 application.     
                    
                 The minimum amount that can be transferred by telephone is
                 $100. However, if you have established one of the automatic
                 options, the minimum amount is $50. The maximum amount that
                 can be transferred using any of the options is $100,000.     
 
                 Special rules govern how your Fund Express purchases or re-
                 demptions are credited to your account. In addition, some
                 services of Fund Express cannot be used with specific Van-
                 guard Funds. For more information, please refer to the Van-
                 guard Fund Express brochure.
                 
VANGUARD         Vanguard's Dividend Express allows you to transfer your divi-
DIVIDEND EXPRESS dends and/or capital gains distributions automatically from
                 your Fund account, one business day after the Fund's payable
                 date, to your account at a bank, savings and loan associa-
                 tion, or credit union that is a member of the Automated
                 Clearing House (ACH) network. You may elect this service on
                 the Account Registration Form or call our Investor Informa-
                 tion Department (1-800-662-7447) for a Vanguard Dividend Ex-
                 press application.     
                    
VANGUARD TELE-   Vanguard's Tele-Account is a convenient, automated service
ACCOUNT          that provides share price, price change and yield quotations
                 on Vanguard Funds through any TouchTone(TM) telephone. This
                 free service also lets you obtain information about your ac-
                 count balance, your last transaction, and your most recent
                 dividend or capital gains payment. To contact Vanguard's
                 Tele-Account service, dial 1-800-ON-BOARD (1-800-662-6273). A
                 free brochure offering detailed operating instructions is
                 available from our Investor Information Department (1-800-
                 662-7447).     
- --------------------------------------------------------------------------------
 
28
<PAGE>
 


                                 (LOGO)
 
                  ----------------------------------
 
                  THE VANGUARD GROUP
                   OF INVESTMENT
                   COMPANIES
                  Vanguard Financial Center
                     
                  P.O. Box 2600     
                  Valley Forge, PA 19482
 
                  INVESTOR INFORMATION
                   DEPARTMENT:
                     
                  1-800-662-7447 (SHIP)     
 
                  CLIENT SERVICES
                   DEPARTMENT:
                     
                  1-800-662-2739 (CREW)     
 
                  TELE-ACCOUNT FOR
                   24-HOUR ACCESS:
                  1-800-662-6273 (ON-BOARD)
 
                  TELECOMMUNICATION  SERVICE FOR THE
                   HEARING-IMPAIRED:
                  1-800-662-2738
 
                  TRANSFER AGENT:
                  The Vanguard Group, Inc.
                  Vanguard Financial Center
                  Valley Forge, PA 19482
 

          
PO18      

             
                                     (LOGO)
 
                              P R O S P E C T U S
                                 
                              MARCH 11, 1994     
 
 
 
 
                          (LOGO OF THE VANGUARD GROUP APPEARS HERE)
 
<PAGE>
 
                                    PART B
                    VANGUARD FLORIDA INSURED TAX-FREE FUND
 
                      STATEMENT OF ADDITIONAL INFORMATION
                                 
                              MARCH 11, 1994     
   
  This Statement is not a prospectus but should be read in conjunction with
the Fund's current Prospectus dated March 11, 1994. To obtain this Prospectus,
please call:     
 
                  VANGUARD'S INVESTOR INFORMATION DEPARTMENT
                                1-800-662-7447
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Investment Limitations.....................................................  B-1
Investment Policies........................................................  B-3
Risk Factors...............................................................  B-6
Florida Intangible Personal Property Tax...................................  B-8
Performance Measures.......................................................  B-8
Investment Management...................................................... B-10
Purchase of Shares......................................................... B-10
Redemption of Shares....................................................... B-11
Management of the Fund..................................................... B-12
Description of Shares and Voting Rights.................................... B-14
Financial Statement........................................................ B-15
Appendix A--Description of Municipal Bonds and their Ratings............... B-16
Appendix B--Municipal Lease Obligations.................................... B-19
</TABLE>
 
                            INVESTMENT LIMITATIONS
 
  The following limitations cannot be changed without the consent of the hold-
ers of a majority of the Fund's outstanding shares (as defined in the Invest-
ment Company Act of 1940), including a majority of the shares of the Fund.
 
    1. The Fund will not invest in securities other than municipal bonds, ex-
  cept that it may make temporary investments in (a) notes issued by or on
  behalf of municipal or corporate issuers, obligations of the United States
  Government and its agencies or instrumentalities, commercial paper, bank
  certificates of deposit, (b) any investment companies investing in such se-
  curities which have investment objectives and policies consistent with
  those of the Fund to the extent permitted by the 1940 Act; and (c) any such
  securities or Municipal Bonds subject to short-term repurchase agreements;
 
    2. The Fund will limit the aggregate value of all holdings (except U.S.
  Government and cash items, as defined under Subchapter M of the Internal
  Revenue Service Code), each of which exceeds 5% of the Portfolio's total
  assets, to an aggregate amount of 50% of such assets;
 
    3. The Fund will limit the aggregate value of holdings of a single issuer
  (except U.S. Government and cash items, as defined in the Code) to a maxi-
  mum of 25% of the Fund's total assets. For the purposes of this limitation,
  identification of the issuer will be based on a determination of the source
  of assets and revenues committed to meeting interest and principal payments
  of each security;
 
    4. The Fund will not borrow money except for temporary emergency purposes
  and then only in an amount not exceeding 10% of the value of the total as-
  sets of that Fund. The Fund will repay
 
                                                                            B-1
<PAGE>
 
  all borrowing before making additional investments. Interest paid on such
  borrowings will reduce income;
 
    5. The Fund will not pledge, mortgage or hypothecate its assets to any
  extent greater than 10% of the value of the total assets of the Fund;
 
    6. The Fund will not issue senior securities as defined in the Investment
  Company Act of 1940 (the "1940 Act");
 
    7. The Fund will not engage in the business of underwriting securities
  issued by other persons except to the extent that the Portfolio may techni-
  cally be deemed to be an underwriter under the Securities Act of 1933, as
  amended, in disposing of investment securities; and;
 
    8. The Fund will not purchase or sell real estate, but this shall not
  prevent investments in Municipal Bonds secured by real estate or interests
  therein;
 
    9. The Fund will not make loans to other persons, except by the purchase
  of bonds, debentures or similar obligations which are publicly distributed
  and as provided under "Lending of Securities";
 
    10. The Fund will not purchase on margin or sell short, except as speci-
  fied below in Investment Limitation No. 12;
 
    11. The Fund will not purchase or retain securities of an issuer if those
  Trustees of the Fund, each of whom owns more than 1/2 of 1% of such securi-
  ties, together own more than 5% of the securities of such issuer;
 
    12. The Fund will not purchase or sell commodities or commodities con-
  tracts, except that the Fund may invest in bond futures contracts, bond op-
  tions and options on bond futures contracts to the extent that not more
  than five percent of the Fund's assets are required as deposit on futures
  contracts.
 
    13. The Fund will not invest its assets in securities of other investment
  companies except as they may be acquired as part of a merger, consolida-
  tion, reorganization or purchase of assets approved by the Portfolio's
  shareholders or otherwise to the extent permitted by Section 12 of the 1940
  Act;
 
    14. The Fund will not invest in put, call, straddle or spread options
  (except as described above in investment limitation No. 12) or interests in
  oil, gas or other mineral exploration or development programs; and
 
    15. The Fund will not purchase an industrial revenue bond if as a result
  of such purchase (i) more than 5% of the Portfolio's total assets, deter-
  mined at market value at the time of the proposed investment, would be in-
  vested in industrial revenue bonds where the payment of principal and in-
  terest is the responsibility of a company with less than three (3) years
  operating history, or (ii) more than 20% of the Portfolio's total assets,
  determined at market value at the time of the proposed investment, would be
  invested in industrial development bonds. These restrictions do not apply
  to municipal obligations where the payment of principal and interest is the
  responsibility of a government or the political subdivision of a govern-
  ment.
 
    16. The Fund will not purchase or otherwise acquire any security (includ-
  ing the Fund's investment in The Vanguard Group, Inc.) if, as a result,
  more than 15% of its net assets would be invested in securities that are
  illiquid.
 
  The above-mentioned investment limitations are considered at the time invest-
ment securities are purchased. Notwithstanding these limitations, the Fund may
own all or any portion of the securities of, or make loans to, or contribute to
the costs or other financial requirements of, any company which will be (1)
wholly-owned by the Fund and one or more other investment companies and (2)
primarily engaged in the business of providing, at cost, management, adminis-
trative, distribution and/or related services to the Fund and such other in-
vestment companies. Additionally, the Fund may invest in when-issued securities
without limitation. Please see the prospectus for a description of such securi-
ties.
 
B-2
<PAGE>
 
                              INVESTMENT POLICIES
 
  REPURCHASE AGREEMENTS The Fund may invest in repurchase agreements with com-
mercial banks, brokers or dealers either for defensive purposes due to market
conditions or to generate income from its excess cash balances. A repurchase
agreement is an agreement under which the Fund acquires a money market instru-
ment (generally a security issued by the U.S. Government or an agency thereof,
a banker's acceptance or a certificate of deposit) from a commercial bank, bro-
ker or dealer, subject to resale to the seller at an agreed upon price and date
(normally, the next business day). A repurchase agreement may be considered a
loan collateralized by securities. The resale price reflects an agreed upon in-
terest rate effective for the period the instrument is held by the Fund and is
unrelated to the interest rate on the underlying instrument. In these transac-
tions, the securities acquired by the Fund (including accrued interest earned
thereon) must have a total value in excess of the value of the repurchase
agreement and are held by the Fund's custodian bank until repurchased. In addi-
tion, the Fund's Board of Trustees will monitor the Fund's repurchase agreement
transactions generally and will establish guidelines and standards for review
by the investment adviser of the creditworthiness of any bank, broker or dealer
party to a repurchase agreement with the Fund. No more than an aggregate of 15%
of a Fund's assets, at the time of investment, will be invested in repurchase
agreements having maturities longer than seven days and securities subject to
legal or contractual restrictions on resale, or for which there are no readily
available market quotations.
 
  The use of repurchase agreements involves certain risks. For example, if the
other party to the agreement defaults on its obligations to repurchase the un-
derlying security at a time when the value of the security has declined, the
Fund may incur a loss upon disposition of the security. If the other party to
an agreement becomes insolvent and subject to liquidation or reorganization un-
der the Bankruptcy Code or other laws, a court may determine that the under-
lying security is collateral for a loan by the Fund not within the control of
the Fund and therefore the realization by the Fund on such collateral may be
automatically stayed. Finally, it is possible that the Fund may not be able to
substantiate its interest in the underlying security and may be deemed an
unsecured creditor of the other party to the agreement. While the Fund's man-
agement acknowledges these risks, it is expected that they can be controlled
through careful monitoring procedures.
 
  LENDING OF SECURITIES The Fund may lend its investment securities to quali-
fied institutions who need to borrow securities in order to complete certain
transactions, such as covering short sales, avoiding failures to deliver secu-
rities or completing arbitrage operations. By lending its investment securi-
ties, the Fund attempts to increase its income through the receipt of interest
on the loan. Any gain or loss in the market price of the securities loaned that
might occur during the term of the loan would be for the account of the Fund.
The Fund may lend its investment securities to qualified brokers, dealers,
banks or other financial institutions, so long as the terms and the structure
of such loans are not inconsistent with the Investment Company Act of 1940, or
the Rules and Regulations or interpretations of the Securities and Exchange
Commission (the "Commission") thereunder, which currently require that (a) the
borrower pledge and maintain with the Fund collateral having a value at all
times not less than 100% of the value of the securities loaned, (b) the bor-
rower add to such collateral whenever the price of the securities loaned rises
(i.e., the borrower "marks to the market" on a daily basis), (c) the loan be
made subject to termination by the Fund at any time and (d) the Fund receive
reasonable interest on the loan (which may include the Fund investing any cash
collateral in interest bearing short-term investments), any distribution on the
loaned securities and any increase in their market value. The Fund will not
lend its investment securities, if as a result, the aggregate of such loans ex-
ceeds 10% of the value of its total assets. Loan arrangements made by the Fund
will comply with all other applicable regulatory requirements, including the
rules of the New York Stock Exchange, which rules presently require the borrow-
er, after notice, to redeliver the securities within the normal settlement time
of five business days. All relevant facts and circumstances, including the
creditworthiness of the broker, dealer or institution, will be considered in
making decisions with respect to the lending of securities, subject to review
by the Fund's Board of Trustees. Income derived
 
                                                                             B-3
<PAGE>
 
from lending of securities is not tax-exempt, and, thus, a portfolio will limit
such activity in accordance with its investment objective.
 
  FUTURES CONTRACTS AND OPTIONS The Fund may enter into futures contracts,
options, and options on futures contracts for the purpose of simulating full
investment and reducing transactions costs. Futures contracts provide for the
future sale by one party and purchase by another party of a specified amount of
a specific security at a specified future time and at a specified price.
Futures contracts which are standardized as to maturity date and underlying
financial instrument are traded on national futures exchanges. Futures
exchanges and trading are regulated under the Commodity Exchange Act by the
Commodity Futures Trading Commission ("CFTC"), a U.S. Government Agency.
 
  Although futures contracts by their terms call for actual delivery or accept-
ance of the underlying securities, in most cases the contracts are closed out
before the settlement date without the making or taking of delivery. Closing
out an open futures position is done by taking an opposite position ("buying" a
contract which has previously been "sold," or "selling" a contract previously
purchased) in an identical contract to terminate the position. Brokerage com-
missions are incurred when a futures contract is bought or sold.
 
  Futures traders are required to make a good faith margin deposit in cash or
government securities with a broker or custodian to initiate and maintain open
positions in futures contracts. A margin deposit is intended to assure comple-
tion of the contract (delivery or acceptance of the underlying security) if it
is not terminated prior to the specified delivery date. Minimal initial margin
requirements are established by the futures exchange and may be changed. Bro-
kers may establish deposit requirements which are higher than the exchange min-
imums. Futures contracts are customarily purchased and sold at prices which may
range upward from less than 5% of the value of the contract being traded.
 
  After a futures contract position is opened, the value of the contract is
marked to market daily. If the futures contract price changes, to the extent
that the margin on deposit does not satisfy margin requirements, payment of ad-
ditional "variation" margin will be required. Conversely, changes in the con-
tract value may reduce the required margin, resulting in a repayment of excess
margin to the contract holder. Variation margin payments are made to and from
the futures broker for as long as the contract remains open. The Fund expects
to earn interest income on its margin deposits.
 
  Traders in futures contracts may be broadly classified as either "hedgers" or
"speculators." Hedgers use the futures markets primarily to offset unfavorable
changes in the value of securities otherwise held for investment purposes or
expected to be acquired by them. Speculators are less inclined to own the secu-
rities underlying the futures contracts which they trade, and use futures con-
tracts with the expectation of realizing profits from fluctuations in the in-
terest rates of underlying securities. The Fund intends to use futures con-
tracts only for bona fide hedging purposes.
 
  Regulations of the CFTC applicable to the Fund require that all of its
futures transactions constitute bona fide hedging transactions. The Fund will
only sell futures contracts to protect securities it owns against price de-
clines or purchase contracts to protect against an increase in the price of se-
curities it intends to purchase. As evidence of this hedging interest, the Fund
expects that approximately 75% of its futures contract purchases will be "com-
pleted," that is, equivalent amounts of related securities will have been pur-
chased or are being purchased by the Fund upon sale of open futures contracts.
 
  Although techniques other than the sale and purchase of futures contracts
could be used to control the Fund's exposure to market fluctuations, the use of
futures contracts may be a more effective means of hedging this exposure. While
the Fund will incur commission expenses in both opening and closing out futures
positions, these costs are lower than transaction costs incurred in the pur-
chase and sale of the underlying securities.
 
 
B-4
<PAGE>
 
  RESTRICTIONS ON THE USE OF FUTURES CONTRACTS The Fund will not enter into
futures contract transactions to the extent that, immediately thereafter, the
sum of its initial margin deposits on open contracts exceeds 5% of the market
value of the Fund's total assets. In addition, the Fund will not enter into
futures contracts to the extent that its outstanding obligations to purchase
securities under these contracts would exceed 20% of the Fund's total assets.
 
  RISK FACTORS IN FUTURES TRANSACTIONS Positions in futures contracts may be
closed out only on an Exchange which provides a secondary market for such
futures. However, there can be no assurance that a liquid secondary market will
exist for any particular futures contract at any specific time. Thus, it may
not be possible to close a futures position. In the event of adverse price
movements, the Fund would continue to be required to make daily cash payments
to maintain its required margin. In such situations, if the Fund has insuffi-
cient cash, it may have to sell portfolio securities to meet daily margin re-
quirements at a time when it may be disadvantageous to do so. In addition, the
Fund may be required to make delivery of the instruments underlying futures
contracts it holds. The inability to close options and futures positions also
could have an adverse impact on the ability to effectively hedge it.
 
  The Fund will minimize the risk that it will be unable to close out a futures
contract by only entering into futures which are traded on national futures ex-
changes and for which there appears to be a liquid secondary market. The prin-
cipal interest rate futures exchanges in the United States are the Board of
Trade of the City of Chicago and the Chicago Mercantile Exchange.
 
  The risk of loss in trading futures contracts in some strategies can be sub-
stantial, due both to the low margin deposits required, and the extremely high
degree of leverage involved in futures pricing. As a result, a relatively small
price movement in a futures contract may result in immediate and substantial
loss (as well as gain) to the investor. For example, if at the time of pur-
chase, 10% of the value of the futures contract is deposited as margin, a sub-
sequent 10% decrease in the value of the futures contract would result in a to-
tal loss of the margin deposit, before any deduction for the transaction costs,
if the account were then closed out. A 15% decrease would result in a loss
equal to 150% of the original margin deposit if the contract were closed out.
Thus, a purchase or sale of a futures contract may result in losses in excess
of the amount invested in the contract. However, because the futures strategies
of the Fund are engaged in only for hedging purposes, the Adviser does not be-
lieve that the Fund is subject to the risks of loss frequently associated with
futures transactions. The Fund would presumably have sustained comparable
losses if, instead of the futures contract, it had invested in the underlying
financial instrument and sold it after the decline.
 
  Utilization of futures transactions by the Fund does involve the risk of im-
perfect or no correlation where the securities underlying futures contracts
have different maturities than the portfolio securities being hedged. It is
also possible that the Fund could both lose money on futures contracts and also
experience a decline in value of its portfolio securities. There is also the
risk of loss by the fund of margin deposits in the event of bankruptcy of a
broker with whom the Fund has an open position in a futures contract or related
option.
 
  Most futures exchanges limit the amount of fluctuation permitted in futures
contract prices during a single trading day. The daily limit establishes the
maximum amount that the price of a futures contract may vary either up or down
from the previous day's settlement price at the end of a trading session. Once
the daily limit has been reached in a particular type of contract, no trades
may be made on that day at a price beyond that limit. The daily limit governs
only price movement during a particular trading day and therefore does not
limit potential losses, because the limit may prevent the liquidation of unfa-
vorable positions. Futures contract prices have occasionally moved to the daily
limit for several consecutive trading days with little or no trading, thereby
preventing prompt liquidation of future positions and subjecting some futures
traders to substantial losses.
 
                                                                             B-5
<PAGE>
 
  FEDERAL TAX TREATMENT OF FUTURES CONTRACTS Except for transactions the Fund
has identified as hedging transactions, the Fund is required for federal income
tax purposes to recognize as income for each taxable year its net unrealized
gains and losses on certain futures contracts held as of the end of the year as
well as those actually realized during the year. In most cases, any gain or
loss recognized with respect to a futures contract is considered to be 60%
long-term capital gain or loss and 40% short-term capital gain or loss, without
regard to the holding period of the contract. Furthermore, sales of futures
contracts which are intended to hedge against a change in the value of securi-
ties held by the Fund may affect the holding period of such securities and,
consequently, the nature of the gain or loss on such securities upon disposi-
tion.
 
  In order for the Fund to continue to qualify for federal income tax treatment
as a regulated investment company, at least 90% of its gross income for a tax-
able year must be derived from qualifying income; i.e., dividends, interest,
income derived from loans of securities, gains from the sale of securities or
of foreign currencies or other income derived with respect to the Fund's busi-
ness of investing in securities. In addition, gains realized on the sale or
other disposition of securities held for less than three months must be limited
to less than 30% of the Fund's annual gross income. It is anticipated that any
net gain realized from the closing out of futures contracts will be considered
gain from the sale of securities and therefore be qualifying income for pur-
poses of the 90% requirement. In order to avoid realizing excessive gains on
securities held less than three months, the Fund may be required to defer the
closing out of futures contracts beyond the time when it would otherwise be ad-
vantageous to do so. It is anticipated that unrealized gains on futures con-
tracts, which have been open for less than three months as of the end of the
Fund's fiscal year and which are recognized for tax purposes, will not be con-
sidered gains on sales of securities held less than three months for the pur-
pose of the 30% test.
 
  The Fund will distribute to shareholders annually any net capital gains which
have been recognized for federal income tax purposes (including unrealized
gains at the end of the Fund's fiscal year) on futures transactions. Such dis-
tributions will be combined with distributions of capital gains realized on the
Fund's other investments and shareholders will be advised on the nature of the
transactions.
 
              RISK FACTORS VANGUARD FLORIDA INSURED TAX-FREE FUND
 
  Vanguard Florida Insured Tax-Free Fund invests primarily in the debt obliga-
tions of Florida State government, the State's agencies and authorities, and
various local governments, including counties, cities, towns, special dis-
tricts, and authorities. In general, the credit quality and credit risk of any
issuer's debt depend on the state and local economy, the health of the issuer's
finances, the amount of the issuer's debt, the quality of management, and the
strength of legal provisions in debt documents that protect debt holders.
Credit risk is usually lower wherever the economy is strong, growing and diver-
sified, financial operations are sound, and the debt burden is reasonable.
 
  The average credit rating among American states for full "faith and credit"
state debt is Aa as determined by Moody's Investors Service and AA as deter-
mined by Standard & Poor's Corporation. Against this measure and the criteria
listed above, the credit risk associated with direct obligations of the State
of Florida and the State's agencies and authorities, including general obliga-
tion and revenue bonds, lease debt, and notes, is comparable with the average
for U.S. states. Florida's general obligation bonds have been rated Aa/AA by
both rating agencies for over two decades, during which period the State's ob-
ligations could be characterized as providing high grade security with a very
strong capacity for timely repayment of debt.
 
 
B-6
<PAGE>
 
  The State of Florida's economy is characterized by a large service sector, a
dependence on the tourism and construction industries, and a large retirement
population. The management of rapid growth has been the major challenge facing
state and local governments. In 1980, Florida was ranked seventh among the
states, in terms of population, with 9.7 million people; by 1991, Florida was
ranked fourth with a population of 13.2 million. While attracting many senior
citizens, Florida also offers a favorable business environment and growing em-
ployment opportunities that have continued to generate working-age population
in-migration. As this growth continues, particularly within the retirement pop-
ulation, the demand for both public and private services will increase, which
may strain the service sector's capacity and impede the State's budget balanc-
ing efforts.
 
  During the 1980s, Florida outperformed the nation as measured by such eco-
nomic indicators as employment growth and income levels. Florida's job creation
rate in the non-agriculture sector was the highest of the eleven most populous
states. Fueling this growth in jobs were the continued boom in the tourism in-
dustry and related service sectors and a dynamic construction and construction-
related manufacturing sector. Florida's economy did not suffer the dislocation
and restructuring of the more manufacturing-based economies of the Midwest and
the North during the 1980s and was less exposed to the decline of the textile
industry besieging much of the Southeast.
 
  The primary vulnerability in the Florida economy is exposure to the business
cycle affecting both the tourism and construction industries. Gasoline prices
and supply can also impact tourism. An economic recession reached Florida in
1991 and impacted the service sector considerably, causing the State to experi-
ence an actual job loss for the first time in decades. While Florida's aero-
space and defense contracting industries are now in decline, the State's manu-
facturing economy has diversified into high-tech and electronic equipment and
has been strengthened by a growth in exports. Furthermore, construction jobs as
a percent of total jobs in the State have declined during the late '80s, reduc-
ing cyclical risk. The outlook for the Florida economy is continued expansion
fueled by population growth--but at a slower rate than that of the 1980s.
 
  Personal income levels in Florida are greater than the U.S. average and con-
tinue to grow at a faster rate. These levels in Florida are also less sensitive
to economic downturns than in the U.S., as a whole, since Florida is home to a
greater concentration of senior citizens who rely on dividends, interest, So-
cial Security, and pension benefits, which fluctuate less with the business cy-
cle than does employment income.
 
  Debt levels in the State of Florida are moderate to high, reflecting the tre-
mendous capital demands associated with rapid population growth. Florida is un-
usual among states in that all general obligation "full faith and credit" debt
issues of municipalities must be approved by public referendum and are, there-
fore, relatively rare. Most debt instruments issued by local municipalities and
authorities have a more narrow pledge of security, such as a sales tax stream,
special assessment revenue, user fees, utility taxes, or fuel taxes. Credit
quality of such debt instruments tends to be somewhat lower than that of gen-
eral obligation debt. The State of Florida issues general obligation debt for a
variety of purposes; however, the State constitution requires a specific reve-
nue stream to be pledged to State general obligation bonds as well.
 
  The market for Florida bonds secured by municipal leases has suffered due to
the default of the State of Florida on a private placement lease financing of
an office building in 1989 and several episodes of public consideration (al-
though never carried out) by Brevard County to not appropriate funds to meet
its obligation under a tax-exempt lease financing.
   
  The State of Florida generated steadily increasing fund balances during the
1980s as the State experienced record growth. However, the State experienced
budget strain during the early 1990s due to an economic recession. Compounding
the recession the State's dependence on the sales tax as a primary source of
revenue. State officials acted quickly and responsibly to maintain a balanced
budget by revising revenue projections and controlling spending. Such responsi-
ble fiscal management enhances overall credit quality in the State of Florida.
    
                                                                             B-7
<PAGE>
 
   
  The state's economic and financial condition is showing signs of strength as
the state and national economies emerge from recession in the mid 1990's.
State officials, however, still face tremendous capital and operating pres-
sures due to the growth that will continue to strain the State's narrow reve-
nue base. Future budgets may require a wider revenue base to meet such de-
mands; the most likely candidate for such revenue enhancement is a tax on con-
sumer services. The creation of a Florida personal income tax is a very remote
possibility, since it would require an amendment to the State's Constitution
and a higher level of political support than has currently been generated.
    
                   FLORIDA INTANGIBLE PERSONAL PROPERTY TAX
   
  Although Florida does not have a state personal income tax, it does impose
an intangible personal property tax on certain financial assets, including mu-
tual fund shares. The most common examples of personal property subject to the
tax are shares of stock issued by corporations, bonds issued by corporations
or state, county or municipal governments outside the State of Florida, and
shares of ownership in mutual funds. Unlike most state and local taxes which
are assessed on ordinary income and capital gains derived from mutual fund
shares, the Florida intangible tax is based on the net asset value of these
shares. Under Florida law, shares of a mutual fund will be exempt from the in-
tangibles tax to the extent that, on the annual assessment date (January 1),
its assets are solely invested in exempt Florida securities, exempt U.S. Gov-
ernment securities, or other exempt securities. If, on the annual assessment
date, the Fund's assets are invested in both exempt and non-exempt securities,
only that portion of a share's net asset value represented by U.S. Government
securities (including qualifying obligations of U.S. territories and posses-
sions) will be exempt from the intangibles tax. Under this rule, shares of the
Vanguard Florida Insured Tax-Free Fund are expected to be exempt from the
Florida intangible personal property tax.     
 
                            YIELD AND TOTAL RETURN
   
  The yield of the Fund for the 30 day period ended November 30, 1993 was
4.88%. The total return of the Fund for the year ended November 30, 1993 was
12.38%. The average annual total return for the Fund since inception on Sep-
tember 1, 1992 was 12.31%.     
 
                             PERFORMANCE MEASURES
 
  The Fund may use one or more of the following unmanaged indexes for compara-
tive performance purposes:
 
STANDARD & POOR'S 500 COMPOSITE STOCK PRICE INDEX--is a well-diversified list
of 500 companies representing the U.S. Stock Market.
 
WILSHIRE 5000 EQUITY INDEXES--consists of nearly 5,000 common equity securi-
ties, covering all stocks in the U.S. for which daily pricing is available.
 
WILSHIRE 4500 EQUITY INDEX--consists of all stocks in the Wilshire 5000 except
for the 500 stocks in the Standard and Poor's 500 Index.
 
RUSSELL 3000 STOCK INDEX--a diversified portfolio of over 3,000 common stocks
accounting for over 90% of the market value of publicly traded stocks in the
U.S.
 
RUSSELL 2000 STOCK INDEX--a subset of approximately 2,000 of the smallest
stocks contained in the Russell 3000; a widely used benchmark for small capi-
talization common stocks.
 
 
B-8
<PAGE>
 
MORGAN STANLEY CAPITAL INTERNATIONAL EAFE INDEX--is an arithmetic, market val-
ue-weighted average of the performance of over 900 securities listed on the
stock exchanges of countries in Europe, Australia and the Far East.
 
GOLDMAN SACHS 100 CONVERTIBLE BOND INDEX--currently includes 67 bonds and 33
preferreds. The original list of names was generated by screening for convert-
ible issues of 100 million or greater in market capitalization. The index is
priced monthly.
 
SALOMON BROTHERS GNMA INDEX--includes pools of mortgages originated by private
lenders and guaranteed by the mortgage pools of the Government National Mort-
gage Association.
 
SALOMON BROTHERS HIGH-GRADE CORPORATE BOND INDEX--consists of publicly issued,
non-convertible corporate bonds rated AA or AAA. It is a value-weighted, total
return index, including approximately 800 issues with maturities of 12 years or
greater.
 
SHEARSON LEHMAN LONG-TERM TREASURY BOND--is composed of all bonds covered by
the Shearson Lehman Hutton Treasury Bond Index with maturities of 10 years or
greater.
 
MERRILL LYNCH CORPORATE & GOVERNMENT BOND--consists of over 4,500 U.S. Trea-
sury, Agency and investment grade corporate bonds.
 
SHEARSON LEHMAN CORPORATE (BAA) BOND INDEX--all publicly offered fixed rate
nonconvertible domestic corporate bonds rated Baa by Moody's, with a maturity
longer than 1 year and with more than $25 million outstanding. This index in-
cludes over 1,000 issues.
 
BOND BUYER MUNICIPAL INDEX (20 YEAR) BOND--is a yield index on current coupon
high grade general obligation municipal bonds.
 
STANDARD & POOR'S PREFERRED INDEX--is a yield index based upon the average
yield of four high-grade, non-callable preferred stock issues.
 
NASDAQ INDUSTRIAL INDEX--is composed of more than 3,000 industrial issues. It
is a value-weighted index calculated on price change only and does not include
income.
 
COMPOSITE INDEX--70% Standard & Poor's 500 Index and 30% NASDAQ Industrial In-
dex.
 
COMPOSITE INDEX--35% Standard & Poor's 500 Index and 65% Salomon Brothers High-
Grade Bond Index.
 
COMPOSITE INDEX--65% Standard & Poor's 500 Index and 35% Salomon Brothers High-
Grade Bond Index.
   
LEHMAN BROTHERS AGGREGATE BOND INDEX--is a market weighted index that contains
individually priced U.S. Treasury, agency, corporate, and mortgage pass-through
securities corporate rated BBB- or better. The index has a market value of over
$4 trillion.     
   
LEHMAN BROTHERS MUTUAL FUND SHORT (1-5) GOVERNMENT/CORPORATE INDEX--is a market
weighted index that contains individually priced U.S. Treasury, agency, and
corporate investment grade bonds rated BBB- or better with maturities between 1
and 5 years. The index has a market value of over $1.3 trillion.     
   
LEHMAN BROTHERS MUTUAL FUND INTERMEDIATE (5-10) GOVERNMENT/CORPORATE INDEX--is
a market weighted index that contains individually priced U.S. Treasury, agen-
cy, and corporate securities rated BBB- or better with maturities between 5 and
10 years. The index has a market value of over $600 billion.     
 
 
                                                                             B-9
<PAGE>
 
   
LEHMAN BROTHERS MUTUAL FUND LONG (10+) GOVERNMENT/CORPORATE INDEX--is a market
weighted index that contains individually priced U.S. Treasury, agency, and
corporate securities rated BBB- or better with maturities greater than 10
years. The index has a market value of over $900 billion.     
 
LIPPER SMALL COMPANY GROWTH FUND AVERAGE--the average performance of small com-
pany growth funds as defined by Lipper Analytical Services, Inc. Lipper defines
a small company growth fund as a fund that by prospectus or portfolio practice,
limits its investments to companies on the basis of the size of the company.
From time to time, Vanguard may advertise using the average performance and/or
the average expense ratio of the small company growth funds. (This fund cate-
gory was first established in 1982. For years prior to 1982, the results of the
Lipper Small Company Growth category were estimated using the returns of the
Funds that constituted the Group at its inception.)
 
LIPPER BALANCED FUND AVERAGE--An industry benchmark of average balanced funds
with similar investment objectives and policies, as measured by Lipper Analyti-
cal Services, Inc.
 
LIPPER NON-GOVERNMENT MONEY MARKET FUND AVERAGE--An industry benchmark of aver-
age non-government money market funds with similar investment objectives and
policies, as measured by Lipper Analytical Services, Inc.
 
LIPPER GOVERNMENT MONEY MARKET FUND AVERAGE--An industry benchmark of average
government money market funds with similar investment objectives and policies,
as measured by Lipper Analytical Services, Inc.
 
                             INVESTMENT MANAGEMENT
 
  The Fund receives all investment advisory services on an "internalized," at-
cost basis from an experienced investment management staff employed directly by
The Vanguard Group, Inc. ("Vanguard"), a subsidiary jointly owned by the Fund
and the other Funds in The Vanguard Group of Investment Companies. The invest-
ment management staff is supervised by the senior officers of the Fund.
 
  The investment management staff is responsible for: maintaining the specified
standards; making changes in specific issues in light of changes in the funda-
mental basis for purchasing such securities; and adjusting the Fund to meet
cash inflow (or outflow), which reflects net purchases and exchanges of shares
by investors (or net redemptions of shares) and reinvestment of the Fund's in-
come.
   
  A change in securities held by the Fund is known as "portfolio turnover" and
may involve the payment of the Fund of dealer mark-ups, underwriting commis-
sions and other transaction costs on the sales of securities as well as on the
reinvestment of the proceeds in other securities. The annual portfolio turnover
rate for the Fund is set forth under the heading "Financial Highlights" in the
Fund's prospectus. The portfolio turnover rate is not a limiting factor when
management deems it desirable to sell or purchase securities. It is impossible
to predict whether or not the portfolio turnover rate in future years will vary
significantly from the rates in recent years.     
 
                               PURCHASE OF SHARES
 
  The Fund reserves the right in its sole discretion (i) to suspend the offer-
ing of its shares, (ii) to reject purchase orders when in the judgment of man-
agement such rejection is in the best interest of the Fund, and (iii) to reduce
or waive the minimum for initial and subsequent investments under circumstances
where certain economies can be achieved in sales of the Fund's shares.
 
B-10
<PAGE>
 
  Your purchase will be made in full and fractional shares of the Fund calcu-
lated to three decimal places. Shares are held on deposit for shareholders by
the Fund, which will send to shareholders a statement of shares owned at the
time of each transaction. Share certificates will not be issued for the Fund.
 
                              REDEMPTION OF SHARES
 
  The Fund may suspend redemption privileges or postpone the date of payment
(i) during any period that the New York Stock Exchange is closed, or trading on
the Exchange is restricted as determined by the Securities and Exchange Commis-
sion (the "Commission"), (ii) during any period when an emergency exists as de-
fined by the rules of the Commission as a result of which it is not reasonably
practicable for the Fund to dispose of securities owned by it, or fairly to de-
termine the value of its assets, and (iii) for such other periods as the Com-
mission may permit.
 
  If the Board of Trustees determines that it would be detrimental to the best
interests of the remaining shareholders of the Fund to make payment wholly or
partly in cash, the Fund may pay the redemption price in whole or in part by a
distribution in kind of securities held by the Fund in lieu of cash in confor-
mity with applicable rules of the Commission. Investors may incur brokerage
charges on the sale of such securities so received in payment of redemptions.
 
  No charge is made by the Fund for redemptions except for wire redemptions of
under $5000 which may be charged a maximum fee of $5.00. Any redemption may be
more or less than the shareholder's cost depending on the market value of the
securities held by the Fund.
 
  Signature Guarantees. To protect your account, the Fund and Vanguard from
fraud, signature guarantees are required for certain redemptions. Signature
guarantees enable the Fund to verify the identity of the person who has autho-
rized a redemption from your account. Signature guarantees are required in con-
nection with: (1) redemptions involving more than $25,000 on the date of re-
ceipt by Vanguard of all necessary documents; (2) all redemptions, regardless
of the amount involved, when the proceeds are to be paid to someone other than
the registered owners); and (3) share transfer requests.
 
  A signature guarantee may be obtained from a bank broker or any other guaran-
tee that Vanguard deems to be acceptable.
 
  The signature guarantees must appear either: (1) on the written request for
redemption or (2) on a separate instrument for assignment ("stock power") which
should specify the total number of shares to be redeemed.
 
                                                                            B-11
<PAGE>
 
                             MANAGEMENT OF THE FUND
 
OFFICERS AND TRUSTEES
 
  The Fund's Officers, under the supervision of the Board of Trustees, manage
the day-to-day operations of the Fund. The Trustees, which are elected annually
by shareholders, set broad policies for the Fund and choose its Officers.
 
  A list of the Trustees and Officers of the Fund and a brief statement of
their present positions and principal occupations during the past 5 years is
set forth below.
 
  The mailing address of the Fund's Trustees and officers is Post Office Box
876, Valley Forge, PA 19482.
JOHN C. BOGLE, Chairman, Chief Executive Officer and Trustee*
 Chairman, Chief Executive Officer, and Director of The Vanguard Group, Inc.,
 and of each of the investment companies in The Vanguard Group. Director of
 The Mead Corporation and General Accident Insurance.
 
JOHN J. BRENNAN, President & Trustee*
 President and Director of The Vanguard Group, Inc. and of each of the other
 investment companies in The Vanguard Group.
 
ROBERT E. CAWTHORN, Trustee
 Chairman and Chief Executive Officer, Rhone-Poulenc Rorer, Inc.; Director of
 Immune Response Corp. and Sun Company, Inc.; Trustee, Universal Health Realty
 Income Trust.
 
BARBARA BARNES HAUPTFUHRER, Trustee
 Director of The Great Atlantic and Pacific Tea Company, Alco Standard Corp.,
 Raytheon Company, Knight-Ridder Inc., and Massachusetts Mutual Life Insurance
 Co.
 
BURTON G. MALKIEL, Trustee
 Chemical Bank Chairmen's Professor of Economics, Princeton University; Direc-
 tor of Prudential Insurance Co. of America, Amdahl Corporation, Baker
 Fentress & Co. and Jeffrey Co., and The Southern New England Telephone Compa-
 ny.
   
ALFRED M. RANKIN, Trustee     
    
 President, Chief Executive Officer and Director of NACCO Industries, Inc.;
 Director of The BFGoodrich Company, The Standard Products Company and The Re-
 liance Electric Company.     
 
JOHN C. SAWHILL, Trustee
 President and Chief Executive Officer, The Nature Conservancy; formerly, Di-
 rector and Senior Partner, McKinsey & Co.; President, New York University;
 Director of Pacific Gas and Electric Company and NACCO Industries.
 
JAMES O. WELCH, JR., Trustee
 Retired Chairman of Nabisco Brands Inc., retired Vice Chairman and Director
 of RJR Nabisco; Director of TECO Energy, Inc.
 
J. LAWRENCE WILSON, Trustee
 Chairman and Director of Rohm & Haas Company; Director of Cummins Engine
 Company and Vanderbilt University; Trustee of the Culver Educational
 Foundation.
 
RAYMOND J. KLAPINSKY, Secretary*
 Senior Vice President and Secretary of The Vanguard Group, Inc.; Secretary of
 each of the investment companies in The Vanguard Group.
 
RICHARD F. HYLAND, Treasurer*
 Treasurer of The Vanguard Group, Inc. and of each of the investment companies
 in The Vanguard Group.
 
KAREN E. WEST, Controller*
 Vice President of The Vanguard Group, Inc.; Controller of each of the invest-
 ment companies in The Vanguard Group.
- --------
* Officers of the Trust are "interested persons" as defined in the Investment
  Company Act of 1940.
THE VANGUARD GROUP
  The Fund is a member of The Vanguard Group of Investment Companies. Through
their jointly owned subsidiary, The Vanguard Group, Inc. ("Vanguard"), the Fund
and the other Funds in the Group obtain at-cost virtually all of their corpo-
rate management, administrative and distribution services. Vanguard also pro-
vides investment advisory services on an at-cost basis to nine of the Vanguard
Funds, including the Vanguard Florida Insured Tax-Free Fund.
 
B-12
<PAGE>
 
  Vanguard employs a supporting staff of management and administrative person-
nel needed to provide the requisite services to the Funds and also furnishes
the Funds with necessary office space, furnishings and equipment. Each Fund
pays its share of Vanguard's net expenses which are allocated among the Funds
under methods approved by the Board of Trustees (Directors) of each Fund. In
addition, each Fund bears its own direct expenses such as legal, auditing and
custodian fees.
 
  The Fund's Officers are also officers and employees of Vanguard. No officer
or employee owns, or is permitted to own, any securities of any external ad-
viser for the Funds.
   
  The Vanguard Group was established and operates under a Funds' Service
Agreement which was approved by the shareholders of each of the Funds. The
amounts which each of the Funds have invested are adjusted from time to time
in order to maintain the proportionate relationship between each Fund's rela-
tive net assets and its contribution to Vanguard's capital. At November 30,
1993, the Fund had contributed $43,000 representing .2 of 1% of Vanguard's
Capitalization. The Funds' Service Agreement was amended on May 10, 1993 to
provide for the following arrangement: (1) each Vanguard Fund may invest a
maximum of 0.40% of its assets in Vanguard and (2) there is no restriction on
the maximum cash investment that the Vanguard Funds may make in Vanguard.     
   
  MANAGEMENT. Corporate management and administrative services include: (1)
executive staff; (2) accounting and financial; (3) legal and regulatory; (4)
shareholder account maintenance; (5) monitoring and control of custodian rela-
tionships; (6) shareholder reporting; and (7) review and evaluation of advi-
sory and other services provided to the Funds by third parties. During the
year ended November 30, 1993, the Fund's share of Vanguard's actual net costs
of operations relating to management and administrative services (including
transfer agency) totaled approximately $308,000.     
 
  DISTRIBUTION. Vanguard provides all distribution and marketing activities
for the Funds in the Group. Vanguard Marketing Corporation, a wholly-owned
subsidiary of The Vanguard Group, Inc., acts as Sales Agent for shares of the
Funds in connection with any sales made directly to investors in the states of
Florida, Missouri, New York, Ohio, Texas and such other states as it may be
required.
 
  The principal distribution expenses are for advertising, promotional materi-
als and marketing personnel. Distribution services may also include organizing
and offering to the public, from time to time, one or more new investment com-
panies which will become members of the Group. The Trustees (Directors) and
officers of Vanguard determine the amount to be spent annually on distribution
activities, the manner and amount to be spent on each Fund, and whether to or-
ganize new investment companies.
   
  One-half of the distribution expenses of a marketing and promotional nature
is allocated among the Funds based upon their relative net assets. The remain-
ing one-half of these expenses is allocated among the Funds based upon each
Fund's sales for the preceding 24 months relative to the total sales of the
Funds as a Group, provided, however, that no Fund's aggregate quarterly rate
of contribution for distribution expenses of a marketing and promotional na-
ture shall exceed 125% of the average distribution expense rate for the Group,
and that no Fund shall incur annual distribution expenses in excess of 20/100
of 1% of its average month-end net assets. During the year ended November 30,
1993, the Fund paid approximately $36,000 of the Group's distribution and mar-
keting expenses.     
   
  INVESTMENT ADVISORY SERVICES. Vanguard also provides investment advisory
services to the Fund, Vanguard Municipal Bond Fund, Vanguard Money Market Re-
serves, Vanguard California Tax-Free Fund, Vanguard Pennsylvania Tax-Free
Fund, Vanguard New Jersey Tax-Free Fund, Vanguard New York Insured Tax-Free
Fund, Vanguard Ohio Tax-Free Fund, Vanguard Admiral Funds, Vanguard Interna-
tional Equity Index Fund, Vanguard Balanced Index Fund, Vanguard Institutional
Index Fund, Vanguard Bond Index Fund, several Portfolios of Vanguard Variable
Insurance Fund and several Portfolios of Vanguard Fixed Income Securities
Fund. These services are provided on an at-cost basis from a money management
staff employed directly by Vanguard. The compensation and other expenses of
this staff are paid by the Funds utilizing these services. During the year
ended November 30, 1993 the Fund paid approximately $15,000 of Vanguard's in-
vestment advisory expenses.     
 
                                                                           B-13
<PAGE>
 
   
  REMUNERATION OF TRUSTEES AND OFFICERS. The Fund pays each Trustee, who is not
also an Officer, an annual fee plus travel and other expenses incurred in at-
tending Board meetings. During the year ended November 30, 1993, the Fund paid
$1,000 in Trustees' expenses. The Fund's Officers and employees are paid by
Vanguard which, in turn, is reimbursed by the Fund, and each other Fund in the
Group, for its proportionate share of officers' and employees' salaries and re-
tirement benefits. During the year ended November 30, 1993, the Fund's propor-
tionate share of remuneration paid to all officers of the Fund as a group was
approximately $8,502.     
   
  Upon retirement, Trustees who are not Officers are paid an annual fee based
upon the number of years of service on the Board. The fee is equal to $1,000
for each year of service up to a maximum of $15,000. Under its retirement plan,
Vanguard contributes annually an amount equal to 10% of each officer's annual
compensation plus 5.7% of that part of the officer's compensation during the
year, if any, that exceed the Social Security Taxable Wage Base then in effect.
Under Vanguard's thrift plan, all employees are permitted to make pre-tax con-
tributions in a maximum amount equal to 4% of total compensation. Vanguard
matches the basic contribution on a 100% basis. During the year ended November
30, 1993, the Fund's proportionate share of retirement benefits paid to all of-
ficers of the Fund as a group, was approximately $1,234.     
 
                    DESCRIPTION OF SHARES AND VOTING RIGHTS
 
  The Fund was organized as a Pennsylvania Trust on May 22, 1992.
 
  The Declaration of Trust permits the Trustees to issue an unlimited number of
shares of beneficial interest, without par value, from an unlimited number of
separate classes ("Portfolios") of shares. Currently, the Fund is offering
shares of one Portfolio.
 
  The shares of the Fund are fully paid and nonassessable, except as set forth
under "Shareholder and Trustee Liability," and have no preference as to conver-
sion, exchange, dividends, retirement or other features. The shares of the Fund
have no pre-emptive rights. The shares of the Fund have non-cumulative voting
rights, which means that the holders of more than 50% of the shares voting for
the election of Trustees can elect 100% of the Trustees if they choose to do
so. A shareholder is entitled to one vote for each full share held (and a frac-
tional vote for each fractional share held), then standing in his name on the
books of the Fund. On any matter submitted to a vote of shareholders, all
shares of the Fund then issued and outstanding and entitled to vote, irrespec-
tive of the class, shall be voted in the aggregate and not by class: except (i)
when required by the Investment Company Act of 1940, shares shall be voted by
individual class; and (ii) when the matter does not affect any interest of a
particular class, then only shareholders of the affected class or classes shall
be entitled to vote thereon.
 
  The Fund will continue without limitation of time, provided, however that:
 
    1) Subject to the majority vote of the holders of shares of the Fund out-
  standing, the Trustees may sell or convert the assets of the Fund to an-
  other investment company in exchange for shares of such investment company,
  and distribute such shares, ratably among the shareholders of the Fund.
 
    2) Subject to the majority vote of shares of the Fund outstanding, the
  Trustees may sell and convert into money the assets of the Fund and dis-
  tribute such assets ratably among the shareholders of the Fund; and
 
  Upon completion of the distribution of the remaining proceeds or the remain-
ing assets of any Portfolio as provided in paragraphs 1) and 2) above the Fund
shall terminate and the Trustees shall be discharged of any and all further li-
abilities and duties hereunder and the right, title and interest of all parties
shall be cancelled and discharged.
 
B-14
<PAGE>
 
  SHAREHOLDER AND TRUSTEE LIABILITY. Under Pennsylvania law shareholders of
such a Trust may under certain circumstances, be held personally liable as
partners for the obligations of the Fund. Therefore, the Declaration of Trust
contains an express disclaimer of shareholder liability for acts or obligations
of the Fund and requires that notice of such disclaimer be given in each agree-
ment, obligation, or instrument entered into or executed by the Fund or the
Trustees. The Declaration of Trust provides for indemnification out of the Fund
property of any shareholder held personally liable for the obligations of the
Fund. The Declaration of Trust also provides that the Fund shall, upon request,
assume the defense of any claim made against any shareholder for any act or ob-
ligation of the Fund and satisfy any judgment thereon. Thus, the risk of a
shareholder incurring financial loss on account of shareholder liability is
limited to circumstances in which the Fund itself would be unable to meet its
obligations.
 
  The Declaration of Trust further provides that the Trustees will not be lia-
ble for errors of judgment or mistakes of fact or law but nothing in the Decla-
ration of Trust protects a Trustee against any liability to which he would oth-
erwise be subject by reason of willful misfeasance, bad faith, gross negli-
gence, or reckless disregard of the duties involved in the conduct of his of-
fice.
 
                              FINANCIAL STATEMENTS
   
  The Fund's financial statements for the year ended November 30, 1993, includ-
ing the financial highlights, appearing in the Fund's 1993 Annual Report to
Shareholders, and the report thereon of Price Waterhouse, independent accoun-
tants, also appearing therein, are incorporated by reference in this Statement
of Additional Information. The Fund's 1993 Annual Report to Shareholders is en-
closed with this Statement of Additional Information.     
 
                                                                            B-15
<PAGE>
 
          APPENDIX A--DESCRIPTION OF MUNICIPAL BONDS AND THEIR RATINGS
 
  Municipal Bonds--General. Municipal Bonds generally include debt obligations
issued by states and their political subdivisions, and duly constituted author-
ities and corporations, to obtain funds to construct, repair or improve various
public facilities such as airports, bridges, highways, hospitals, housing,
schools, streets and water and sewer works. Municipal Bonds may also be issued
to refinance outstanding obligations as well as to obtain funds for general op-
erating expenses and for loan to other public institutions and facilities.
 
  The two principal classifications of Municipal Bonds are "general obligation"
and "revenue" or "special tax" bonds. General obligation bonds are secured by
the issuer's pledge of its full faith, credit and taxing power for the payment
of principal and interest. Revenue or special tax bonds are payable only from
the revenues derived from a particular facility or class of facilities or, in
some cases, from the proceeds of a special excise or other tax, but not from
general tax revenues. The Fund may also invest in tax-exempt industrial devel-
opment bonds, short-term municipal obligations (rated SP-1+ of SP-1 by Standard
& Poor's Corp. or MIG by Moody's Investors Service), project notes, demand
notes and tax-exempt commercial papers (rated A-1 by Standard & Poor's Corp. or
P-1 by Moody's Investors Service).
 
  Industrial revenue bonds in most cases are revenue bonds and generally do not
have the pledge of the credit of the Issuer. The payment of the principal and
interest on such industrial revenue bonds is dependent solely on the ability of
the user of the facilities financed by the bonds to meet its financial obliga-
tions and the pledge, if any, of real and personal property so financed as se-
curity for such payment. Short-term municipal obligations issued by states,
cities, municipalities or municipal agencies, include Tax Anticipation Notes,
Revenue Anticipation Notes, Bond Anticipation Notes, Construction Loan Notes
and Short-Term Discount Notes. Project Notes are instruments issued by the De-
partment of Housing and Urban Development but issued by a state or local hous-
ing agency. While the issuing agency has the primary obligation on such Project
notes, they are also secured by the full faith and credit of the United States.
 
  Note obligations with demand onput options may have a stated maturity in ex-
cess of one year, but permit any holder to demand payment of principal plus ac-
crued interest upon a specified number of days' notice. Frequently, such obli-
gations are secured by letters of credit or other credit support arrangements
provided by banks. The issuer of such notes normally has a corresponding right,
after a given period, to repay in its discretion the outstanding principal of
the note plus accrued interest upon a specific number of days' notice to the
bondholders. The interest rate on a demand note may be based upon a known lend-
ing rate, such as a bank's prime rate, and be adjusted when such rate changes,
or the interest rate on a demand note may be a market rate that is adjusted at
specified intervals. The demand notes in which the Fund will invest are payable
on not more than one year's notice. Each note purchased by the Fund will meet
the quality criteria set out above for the Fund.
 
  The yields of Municipal Bonds depend on, among other things, general money
market conditions, conditions in the Municipal Bond market, the size of a par-
ticular offering, the maturity of the obligation, and the rating of the issue.
The ratings of Moody's Investors Service, Inc. and Standard & Poor's Corpora-
tion represent their opinions of the quality of the Municipal Bonds rated by
them. It should be emphasized that such ratings are general and are not abso-
lute standards of quality. Consequently, Municipal Bonds with the same maturi-
ty, coupon and rating may have different yields, while Municipal Bonds of the
same maturity and coupon, but with different ratings may have the same yield.
It will be the responsibility of the investment management staff to appraise
independently the fundamental quality of the bonds held by the Fund.
 
  Municipal Bonds are sometimes purchased on a "when issued" basis meaning the
Fund has committed to purchasing certain specified securities at an agreed upon
price when they are issued. The period between commitment date and issuance
date can be a month or more. It is possible that the securities will never be
issued and the commitment canceled.
 
 
B-16
<PAGE>
 
  From time to time proposals have been introduced before Congress to restrict
or eliminate the Federal income tax exemption for interest on Municipal Bonds.
Similar proposals may be introduced in the future. If any such proposal were
enacted, it might restrict or eliminate the ability of the Fund to achieve its
investment objective. In that event, the Fund's Trustees and officers would
reevaluate its investment objective and policies and consider recommending to
its shareholders changes in such objective and policies.
 
  Similarly, from time to time proposals have been introduced before State and
local legislatures to restrict or eliminate the State and local income tax ex-
emption for interest on Municipal Bonds. Similar proposals may be introduced in
the future. If any such proposal were enacted, it might restrict or eliminate
the ability of each Portfolio to achieve its respective investment objective.
In that event, the fund's trustees and officers would reevaluate its investment
objective and policies and consider recommending to its shareholders changes in
such objective and policies. (For more information please refer to "Risk Fac-
tors" on page 5.) Ratings. Excerpts from Moody's Investors Service, Inc.'s Mu-
nicipal Bond ratings: Aaa -- judged to be of the "best quality" and are re-
ferred to as "gilt edge"; interest payments are protected by a large or by an
exceptionally stable margin and principal is secure; Aa -- judged to be of
"high quality by all standards" but as to which margins of protection or other
elements make long-term risks appear somewhat larger than Aaa-rated Municipal
Bonds; together with Aaa group they comprise what are generally known as "high
grade bonds"; A -- possess many favorable investment attributes and are consid-
ered "upper medium grade obligations." Factors giving security to principal and
interest A-rated Municipal Bonds are considered adequate, but elements may be
present which suggest a susceptibility to impairment sometime in the future;
Baa -- considered as medium grade obligations; i.e., they are neither highly
protected nor poorly secured; interest payments and principal security appear
adequate for the present but certain protective elements may be lacking or may
be characteristically unreliable over any great length or time; Ba --protection
of principal and interest payments may be very moderate; judged to have specu-
lative elements; their future cannot be considered as well-assured; B -- lack
characteristics of a desirable investment; assurance of interest and principal
payments over any long period of time may be small; Caa -- (poor standing; may
be in default or there may be present elements of danger with respect to prin-
cipal and interest; Ca -- speculative in a high degree; often in default; C --
 lowest rated class of bonds; issues so rated can be regarded as having ex-
tremely poor prospects for ever attaining any real investment standing.
 
  Description of Moody's ratings of state and municipal notes: Moody's ratings
for state and municipal notes and other short-term obligations are designated
Moody's Investment Grade ("MIG"). Symbols used will be as follows: MIG-1--Best
quality, enjoying strong protection from established cash flows of funds for
their servicing or from established and broad-based access to the market for
refinancing, or both; MIG-2 -- High quality with margins of protection ample
although not so large as in the preceding group.
 
  Description of Moody's highest commercial paper rating: PRIME-1 ("P-1")--
Judged to be of the best quality. Their short-term debt obligations carry the
smallest degree of investment risk.
 
  Excerpts from Standard & Poor's Corporation's Municipal Bond ratings: AAA --
has the highest rating assigned by S&P; extremely strong capacity to pay prin-
cipal and interest; AA -- has a very strong capacity to pay interest and repay
principal and differs from the higher rated issues only in a small degree; A --
has a strong capacity to pay principal and interest, although somewhat more
susceptible to the adverse changes in circumstances and economic conditions;
BBB -- regarded as having an adequate capacity to pay principal and interest;
normally exhibit adequate protection parameters but adverse economic conditions
or changing circumstances are more likely to lead to a weakened capacity to pay
principal and interest than for bonds in A category; BB -- B -- CCC -- CC --
predominantly speculative with respect to capacity to pay interest and repay
principal in accordance with terms of obligation; BB is being paid; D -- in de-
fault, and payment of principal and/or interest is in arrears.
 
 
                                                                            B-17
<PAGE>
 
  The ratings from "AA" to "B" may be modified by the addition of a plus or mi-
nus sign to show relative standing within the major rating categories.
 
  Excerpt from Standard & Poor's Corporation's rating of municipal note issues:
SP-1+ -- very strong capacity to pay principal and interest; SP-1 -- strong ca-
pacity to pay principal and interest.
 
  Description of S&P's highest commercial papers rating: A-1+ -- This designa-
tion indicates the degree of safety regarding timely payment is overwhelming.
A-1 -- This designation indicates the degree of safety regarding timely payment
is very strong.
 
B-18
<PAGE>
 
                    APPENDIX B--MUNICIPAL LEASE OBLIGATIONS
 
  Each Portfolio may invest in municipal lease obligations. Such securities
will be treated as liquid under the following guidelines have been established
by the Board of Trustees:
 
  1. The obligation has been rated "investment grade" by at least one NRSRO and
is considered to be investment grade by the investment adviser.
 
  2. The obligation is secured by payments from a governmental lessee which is
generally recognized and has debt obligations which are actively traded by a
minimum of five broker/dealers.
 
  3. At least $25 million of the lessee debt is outstanding either in a single
transaction or on parity, and owned by a minimum of five institutional invest-
ors.
 
  4. The investment adviser has determined that the obligation, or a comparable
lessee security, trades in the institutional marketplace at least periodically,
with a bid/offer spread of 20 basis points or less.
 
  5. The governmental lessee has a full faith and credit general obligation
rating of at least "A-" as published by at least one NRSRO or as determined by
the investment adviser. If the lessee is a state government, the general obli-
gation rating must be at least BAA1, BBB+, or equivalent, as determined above.
 
  6. The projects to be financed by the obligation are determined to be criti-
cal to the lessee's ability to deliver essential services.
 
  7. Specific legal features such as covenants to maintain the tax-exempt sta-
tus of the obligation, covenants to make lease payments without the right of
offset or counterclaim, covenants to return leased property to the lessor in
the event of non-appropriation, insurance policies, debt service reserve fund,
are present.
 
  8. The lease must be "triple net" (i.e.-lease payments are net of property
maintenance, taxes and insurance).
 
  9. If the lessor is a private entity, there must be a sale and absolute as-
signment of rental payments to the trustee, accompanied by a legal opinion from
recognized bond counsel that lease payments would not be considered property of
the lessor's estate in the event of lessor's bankruptcy.
 
                                                                            B-19
<PAGE>
 
                                    PART C
 
                    VANGUARD FLORIDA INSURED TAX-FREE FUND
 
                               OTHER INFORMATION
 
ITEM 24. FINANCIAL STATEMENTS AND EXHIBITS
 
  (A) FINANCIAL STATEMENTS
   
  The Registrant's audited Financial Statements for the year ended November
30, 1993, including Price Waterhouse's report thereon, are incorporated by
reference, in the Statement of Additional Information, from the Registrant's
1993 Annual Report to Shareholders which has been filed with the Commission.
The financial statements included in the Annual Report are:     
       
    1. Statement of Net Assets as of November 30, 1993     
       
    2. Statement of Operations for the year ended November 30, 1993     
       
    3. Statement of Changes in Net Assets for the period September 1, 1992
      to November 30, 1992, and for the year ended November 30, 1993     
       
    *4. Financial Highlights for the period September 1, 1992 to November
      30, 1992, and for the year ended November 30, 1993     
 
    5. Notes to Financial Statements
 
    6. Report of Independent Accountants
 
- --------
   
* In addition, the financial highlights for each of the respective periods
  presented is included in Part A of this registration.     
 
  (B) EXHIBITS
       
    1. Consent of Independent Accountants     
       
    2. Financial Statements--reference is made to (a) above     
       
    3. Schedule for Computation of Performance Quotations     
 
ITEM 25. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT
   
  Registrant is not controlled by or under common control with any person. The
officers of the Registrant, the 32 investment companies in The Vanguard Group
of Investment Companies and The Vanguard Group, Inc. are identical. Reference
is made to the caption "Management of the Fund" in the Prospectus constituting
Part A and in the Statement of Additional Information constituting Part B of
this Registration Statement.     
 
ITEM 26. NUMBER OF HOLDERS OF SECURITIES
   
  As of November 30, 1993 the number of shareholders of each portfolio of the
Fund was 6,523:     
 
ITEM 27. INDEMNIFICATION
 
  Reference is made to Article XI of Registrant's Declaration of Trust.
 
  Insofar as indemnification for liability arising under the Securities Act of
1933 may be permitted to trustees, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the pay-
 
                                                                            C-1
<PAGE>
 
ment by the registrant of expenses incurred or paid by a trustee, officer or
controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such trustee, officer or controlling person
in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling prece-
dent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.
 
ITEM 29. PRINCIPAL UNDERWRITERS
 
  (a) None
  (b) Not Applicable
 
ITEM 30. LOCATION OF ACCOUNTS AND RECORDS
 
  The books, accounts and other documents required by Section 31(a) under the
Investment Company Act and the rules promulgated thereunder will be maintained
in the physical possession of Registrant; Registrant's Transfer Agent, The Van-
guard Group, Inc. c/o The Vanguard Financial Center, Valley Forge, Pennsylvania
19482; and the Registrant"s Custodian, Philadelphia National Bank, Philadel-
phia, PA.
 
ITEM 31. MANAGEMENT SERVICES
 
  Other than the Amended and Restated Funds' Service Agreement with The Van-
guard Group, Inc. which was previously filed as Exhibit 9(c) and described in
Part B hereof under "Management of the Fund;" the Registrant is not a party of
any management-related service contract.
 
ITEM 32. UNDERTAKINGS
 
  Annual meetings of shareholders will not be held except as required by the
Investment Company Act of 1940 ("1940 Act") or other applicable law. Registrant
undertakes to comply with the provisions of Section 16(c) of the 1940 Act in
regard to shareholders' rights to call a meeting of shareholders for the pur-
pose of voting on the removal of Trustees and to assist in shareholder communi-
cations in such matters, to the extent required by law.
   
  Registrant hereby undertakes to provide an Annual Report to Shareholders or
prospective investors, free of charge, upon request.     
 
C-2
<PAGE>
 
                                  SIGNATURES
   
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933 AND THE
INVESTMENT COMPANY ACT OF 1940, THE REGISTRANT CERTIFIES THAT IT MEETS ALL 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 TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY
AUTHORIZED, IN THE TOWN OF VALLEY FORGE AND THE COMMONWEALTH OF PENNSYLVANIA,
ON THE 9TH DAY OF MARCH, 1994.     
 
                                          Vanguard Florida Insured Tax-Free
                                           Fund
 
                                                        (signature)
                                          BY: _________________________________
                                                  (RAYMOND J. KLAPINSKY)
                                               JOHN C. BOGLE*, CHAIRMAN, AND
                                                  CHIEF EXECUTIVE OFFICER
 
  PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS POST-
EFFECTIVE AMENDMENT TO THE REGISTRATION STATEMENT HAS BEEN SIGNED BELOW BY THE
FOLLOWING PERSONS IN THE CAPACITIES AND ON THE DATE INDICATED:
 
              SIGNATURE                        TITLE                 DATE
    
              (signature)              John C. Bogle*,          
BY: _________________________________   Chairman of the         March 9, 1994
        (RAYMOND J. KLAPINSKY)          Board, Trustee, and 
                                        Chief Executive
                                        Officer      
 
    
              (signature)              John J. Brennan*,       
BY: _________________________________   President and           March 9, 1994
        (RAYMOND J. KLAPINSKY)          Trustee                          
 
    
              (signature)              Barbara B.                            
BY: ________________________________    Hauptfuhrer*,           March 9, 1994
        (RAYMOND J. KLAPINSKY)          Trustee                              
                                       
 
    
              (signature)              Burton G. Malkiel*,      
BY: _________________________________   Trustee                 March 9, 1994
        (RAYMOND J. KLAPINSKY)                                           
 
    
              (signature)              James O. Welch,          
BY: _________________________________   Jr.*, Trustee           March 9, 1994
        (RAYMOND J. KLAPINSKY)                                           
 
    
              (signature)              J. Lawrence Wilson*,                  
BY: _________________________________   Trustee                 March 9, 1994 
        (RAYMOND J. KLAPINSKY)             
 
    
              (signature)              Richard F. Hyland*,      
BY: _________________________________   Treasurer and           March 9, 1994
        (RAYMOND J. KLAPINSKY)          Principal Financial          
                                        Officer and
                                        Accounting Officer       
- --------
* By Power of Attorney--See File Number 2-14336, January 23, 1990. Incorpo-
rated by Reference.
<PAGE>
 
                               INDEX TO EXHIBITS
 
<TABLE>
<S>                                                                          <C>
Accountant's Consent........................................................  11
Schedule For Calculation of Performance Data................................  16
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 11
 
                      CONSENT OF INDEPENDENT ACCOUNTANTS
   
  We hereby consent to the incorporation by reference in the Prospectus and in
the Statement of Additional Information, constituting parts of this Registra-
tion Statement on Form N-1A, of our report dated December 27, 1993 relating to
the financial statements and financial highlights appearing in the November
30, 1993 Annual Report to Shareholders of Vanguard Florida Insured Tax-Free
Fund, which are also incorporated by reference into the Registration State-
ment. We also consent to the references to us under the headings "Financial
Highlights" and "General Information" in the Prospectus and "Financial State-
ments" in the Statement of Additional Information.     
 
Price Waterhouse
 
Thirty South Street
Philadelphia, Pennsylvania
   
March 8, 1994     

<PAGE>
 
                                                                     EXHIBIT 16
              SCHEDULE FOR COMPUTATION OF PERFORMANCE QUOTATIONS
 
                      VANGUARD FLORIDA INSURED-FREE FUND
   
1.Average Annual Total Return (As of November 30, 1993)     
 
   P (1 + T)n = ERV
 
 Where:         P =    a hypothetical initial payment of $1,000
 
                T =    average annual total return
 
                N =    number of years
 
              ERV =    ending redeemable value at the end of the period
 
 EXAMPLE:
 --------
 One Year
 --------
 
       P = 1,000
    
       T = +12.38%     
    
       N = 1     
              
     ERV = $1,123.79     
               
       P = 1,000     
     
       T = +12.31%     
     
       N = *     
     
     ERV = $1,155.74     

 * Since Inception September 1, 1992
   
2.YIELD (30 Days Ended December 31, 1993)     
       
    Yield = 2 [(   a       )/6/ - 1] b X 100 
                 ----- + 1  
                 c X d     
 
 Where:    a =  dividends and interest paid during the period
    
           b =  expense ratios during the period (net of reimbursements)     
 
           c =  the average daily number of shares outstanding during the
                period
 
           d =  the maximum offering price per share on the last day of the
                period
    
 Example a =  $1,099,595.00     
    
         b =  .170     
    
         c =  24,269,617.486     
    
         d =  $10.86     
    
     Yield =  4.89%     


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