VANGUARD FLORIDA INSURED TAX FREE FUND
N-30D, 2000-02-03
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VANGUARD(R) FLORIDA
INSURED LONG-TERM
TAX-EXEMPT FUND

ANNUAL REPORT
NOVEMBER 30, 1999


[A MEMBER OF
THE VANGUARD GROUP LOGO]


<PAGE>

[PHOTO OF JOHN C. BOGLE]

DEAR SHAREHOLDERS:
Two roads  diverged in a wood,  and I--I took the one less traveled by, and that
has made all the difference.

I can think of no better  words than those of Robert Frost to begin this special
letter to our shareholders,  who have placed such extraordinary  trust in me and
in Vanguard  over the past quarter  century.  When the firm was founded 25 years
ago,  we  deliberately  took a new road to  managing a mutual  fund  enterprise.
Instead of having the funds controlled by an outside management company with its
own  financial  interests,  the  Vanguard  funds--there  were  only  11 of  them
then--would be controlled by their own  shareholders and operate solely in their
financial interests.  The outcome of our unprecedented  decision was by no means
certain. We described it then as "The Vanguard Experiment."
     Well, I guess it's fair to say it's an experiment no more.  During the past
25 years,  the assets we hold in  stewardship  for investors  have grown from $1
billion  to more  than  $500  billion,  and I believe  that our  reputation  for
integrity,  fair-dealing,  and sound investment  principles is second to none in
this  industry.  Our  staggering  growth--which  I  never  sought--has  come  in
important part as a result of the simple investment ideas and basic human values
that are the foundation of my personal philosophy.  I have every confidence that
they  will  long  endure at  Vanguard,  for they are the  right  ideas and right
values, unshakable and eternal.
     While Emerson believed that "an institution is the lengthened shadow of one
man," Vanguard today is far greater than any  individual.  The Vanguard crew has
splendidly  implemented  and  enthusiastically  supported our founding ideas and
values, and deserves the credit for a vital role in forging our success over the
years.  It is a  dedicated  crew of fine human  beings,  working  together in an
organization  that is well prepared to press on regardless long after I am gone.
Creating and leading this  enterprise has been an exhilarating  run.  Through it
all,  I've taken the kudos and the blows  alike,  enjoying  every  moment to the
fullest,  and even getting a second chance at life with a heart transplant three
years ago. What more could a man ask?
     While I shall no longer be serving on the Vanguard  Board, I want to assure
you that I will remain  vigorous and active in a newly  created  Vanguard  unit,
researching the financial markets, writing, and speaking. I'll continue to focus
whatever  intellectual  power and  ethical  strength  I possess on my mission to
assure that mutual fund investors everywhere receive a fair shake. In the spirit
of Robert Frost:

     But I have promises to keep,  and miles to go before I sleep,  and miles to
go before I sleep.

     You have given me your loyalty and friendship over these long years,  and I
deeply  appreciate  your  thousands  of letters of support.  For my part, I will
continue to keep an eagle eye on your  interests,  for you deserve no less.  May
God bless you all, always.

/S/
JCB
- --------------------------------------------
CONTENTS
Report From The Chairman .................1
The Markets In Perspective ...............5
Report From The Adviser ..................7
Performance Summary ......................9
Fund Profile ............................10
Financial Statements ....................12
Report Of Independent Accountants........21
- --------------------------------------------

<PAGE>

[PHOTO OF JOHN J. BRENNAN]

REPORT FROM THE CHAIRMAN

Concerns  about higher  inflation  took hold of the bond market during the early
months of Vanguard Florida Insured Long-Term  Tax-Exempt Fund's 1999 fiscal year
and never  loosened  their  grip.  The  resulting  decline in prices made the 12
months ended November 30 a difficult period for fixed-income investors. Our fund
registered a total return of -1.9%,  which was two percentage points better than
that of its  average  peer,  but a bit behind  that of its  unmanaged  benchmark
index.

- --------------------------------------------------------------------------------
                                                    TOTAL RETURNS
                                                  FISCAL YEAR ENDED
                                                  NOVEMBER 30, 1999
- --------------------------------------------------------------------------------
Vanguard Florida Insured
  Long-Term Tax-Exempt Fund                             -1.9%
- --------------------------------------------------------------------------------
Average Florida Insured
  Municipal Debt Fund*                                  -3.9%
- --------------------------------------------------------------------------------
*Derived from data provided by Lipper Inc.


     The table at right presents the fund's  12-month  return along with that of
our average  mutual  fund  competitor.  The total  return  (capital  change plus
reinvested dividends) of our fund is based on a decrease in net asset value from
$11.54 per share on November 30, 1998, to $10.70 per share on November 30, 1999,
and is adjusted for dividends totaling $0.543 per share paid from net investment
income and a  distribution  of $0.091 per share paid from net  realized  capital
gains.  At the end of the fiscal year, the fund's yield was 5.14%, up from 4.33%
a year earlier.
     For Florida  residents,  income  earned by our fund is exempt from  federal
income tax and the Florida intangible  personal property tax, but may be subject
to local taxes and to the alternative minimum tax.

FINANCIAL MARKETS IN REVIEW

The 12 months ended  November 30 featured  plenty of positive  economic news, as
well as a good  deal of  apprehension  over how long  the  good  times  can last
without  touching  off  higher  inflation.  The  U.S.  economy  expanded  at  an
inflation-adjusted  rate of 4.3%  from the  third  quarter  of 1998 to the third
quarter of 1999, the nation's  unemployment rate hovered near record-low levels,
and inflation barely stirred.
     However,  the nagging concern that inflation would soon accelerate resulted
in a steady rise in interest  rates  during the fiscal year.  The rate  increase
merely  restrained the stock market,  which managed an impressive  advance,  but
dealt a heavy blow to bond prices,  which  suffered their worst year since 1994.
The Federal Reserve Board went along with the uptrend in interest rates,  hiking
its target for  short-term  interest  rates by 25 basis points on three separate
occasions  in an attempt to head off  inflation  it believes  could  result from
strong growth and tight labor markets.
     Technology  companies  propelled  the U.S.  stock  market  higher,  and the
Standard & Poor's 500 Index, which is dominated by large-capitalization  stocks,
returned  20.9%--the index's fifth straight year of returns higher than 20%. The
broad market,  as represented by the Wilshire 5000 Total Market Index,  advanced
an even higher  22.4%,  but a large  portion of the gain was  concentrated  in a
relatively  small  number of stocks.  Many  value-oriented  stocks were left far
behind.
     The yield of the 30-year U.S. Treasury bond ended the fiscal year at 6.29%,
up 123 basis points (1.23 percentage points) from its starting point of 5.06% on
November 30, 1998. The yield of 3-month U.S.  Treasury bills climbed to 5.30% on
balance,  from 4.48%.

                                       1

<PAGE>


Yields  of  high-quality,  long-term  municipal  bonds  climbed  nearly  a  full
percentage  point,  from 4.89% when the period  began to 5.87% on  November  30,
1999.
     The Lehman  Brothers 10 Year  Municipal  Bond Index,  a good measure of the
long-term  municipal market,  recorded a return of -0.4% during our fiscal year.
Long-term bonds suffer more when interest rates are rising, just as they benefit
more from a decline in interest rates.
     Municipal  bonds  performed  well  early  in the  1999  fiscal  year as new
issuance  dropped off from 1998's  near-record  levels and yields  remained high
relative to  Treasuries.  But their relative  performance  faltered later in the
period because many investors were attracted to corporate bonds.
     At the end of the fiscal  year,  the  spread  between  yields of  long-term
Treasuries  and long-term  munis stood at just 42 basis points (0.42  percentage
point).  This is an extremely  narrow gap, given that the income from Treasuries
is subject to federal income taxes, while income from a state-specific municipal
bond fund is fully  exempt from  federal  taxes.  On November 30, the yield of a
top-quality, long-term municipal bond was equal to about 93% of the yield of the
30-year U.S. Treasury bond. Historically, the ratio has been about 84%.


FISCAL 1999 PERFORMANCE OVERVIEW

The -1.9% return of Vanguard  Florida  Insured  Long-Term  Tax-Exempt Fund was a
full 2 percentage  points  better than the -3.9%  return of the average  Florida
municipal bond fund,  which has lower average credit quality than our fund but a
similar average maturity.  Our return,  however, was 0.8 percentage point behind
the -1.1% return of the unmanaged Lehman  Municipal Bond Index.  Though our fund
earned an income return of 4.6%, a price decline of -6.5% engendered by the rise
in interest rates pulled our total return into negative  territory for the year.
(The  Performance  Summary on page 9 presents a breakdown of the fund's  returns
into their income and capital  components  dating to the fund's  inception.) Our
performance  advantage over our average peer was due in part to our lower costs.
The Lehman index, which includes  municipal bonds from across the country,  is a
notoriously  tough  competitor  because  it does  not  incur  the  "real  world"
operating  expenses and  transaction  costs that all mutual funds must bear. The
index also has a  slightly  lower  average  duration  than your fund,  making it
slightly less  sensitive to interest rate  changes--an  advantage  during fiscal
1999.
     Though the rise in  interest  rates  during the past 12 months was to blame
for the poor bond  returns,  a slide in rates just one year ago provided a boost
to bond prices and returns.  The simple lesson is that  interest  rates rise and
fall,  sometimes gradually and sometimes sharply. All bond investors should know
that over long  periods,  the ups and downs in rates tend to offset  each other,
leaving  a bond  fund's  interest  income as the chief  source  of  return.  And
considering that interest paid on munis today is considerably higher than a year
ago, it would seem that tax-exempt securities have become more attractive.  At a
yield of about 5.1% compounded annually,  money doubles in a little more than 14
years, or more than two years sooner than at 4.3%.

THE MUNICIPAL BOND TAX ADVANTAGE

For Florida  residents,  the income  earned by our fund is exempt  from  federal
income tax, the Florida  intangible  personal  property  tax, and in most cases,
local taxes. At current yields,  investors in long-term  municipal bonds who are
taxed at the highest  marginal tax rate (39.6%) can earn an astounding  55% more
after-tax  income than they could in comparable  long-term U.S.  Treasury bonds.
For Florida  taxpayers  subject to the  highest tax rates,  a yield of 5.9% on a
tax-exempt long-term bond is the equivalent of a 9.8% taxable yield.

                                       2

<PAGE>


     This remarkable advantage is illustrated in the table below, which compares
the annual net income earned on U.S.  Treasury and  tax-exempt  securities as of
November 30, 1999, assuming a $100,000 investment.

- --------------------------------------------------------------------------------
                                        ILLUSTRATION OF INCOME FROM A
                                       HYPOTHETICAL $100,000 INVESTMENT
- --------------------------------------------------------------------------------
Taxable gross income                               $6,300
Less taxes (39.6%)                                 (2,500)
Net after-tax income                                3,800
- --------------------------------------------------------------------------------
Tax-exempt income                                  $5,900
- --------------------------------------------------------------------------------
Tax-exempt income advantage                        $2,100
Percentage advantage                                   55%
- --------------------------------------------------------------------------------
This  illustration  assumes current yields (as of November 30, 1999) of 6.3% for
long-term  U.S.  Treasury  bonds  and 5.9%  for  long-term  municipals.  The tax
adjustment  assumes a typical itemized tax return based on a federal tax rate of
39.6%.  Income from U.S.  Treasuries is not subject to state taxes;  local taxes
are not  considered.  The  illustration  is not  intended  to  represent  future
results.

     There is an important  distinction  between  state-specific  municipal bond
funds and U.S. Treasury bonds.  Treasury securities are backed by the full faith
and credit of the U.S.  government and therefore have unmatched  credit quality.
Also, municipal bond funds that confine their investments to a single state lack
the diversification that comes from spreading  investments among various states,
which may be subject to  different  economic  conditions  and  different  risks.
Private insurance on the bonds in the Florida Insured Long-Term Tax-Exempt Fund,
however,  helps to reduce these  additional  credit risks.  Though the insurance
does not  provide  protection  against  fluctuations  in the  fund's  value,  it
guarantees full payment of interest and principal for our bond holdings.

LONG-TERM PERFORMANCE OVERVIEW

An annual review of any mutual fund should be  accompanied  by an examination of
the fund's  longer-term  record. The table below compares the performance of our
fund since its September 1, 1992, inception with that of its average peer mutual
fund. It also presents the current value of a  hypothetical  $10,000  investment
made at our fund's  inception.  As you can see,  the Florida  Insured  Long-Term
Tax-Exempt Fund has  established a fine record versus its  competition  during a
life span of more than seven years.  Our advantage over this period has amounted
to $1,177, or about 12% of the original investment.

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------
                                                                 TOTAL RETURNS
                                                      SEPTEMBER 1, 1992, TO NOVEMBER 30, 1999
                                                ------------------------------------------------------------
                                                       AVERAGE                      FINAL VALUE OF
                                                       ANNUAL                         A $10,000
                                                       RETURN                    INITIAL INVESTMENT*
                                                ----------------------   -----------------------------------
<S>                                            <C>            <C>           <C>         <C>           <C>
                                                             AVERAGE                   AVERAGE
                                               VANGUARD    COMPETING       VANGUARD   COMPETING     VANGUARD
                                                 FUND         FUND           FUND        FUND      ADVANTAGE
- ------------------------------------------------------------------------------------------------------------
Florida Insured Long-Term Tax-Exempt Fund         6.4%        5.3%         $15,668     $14,491       $1,177
- ------------------------------------------------------------------------------------------------------------
</TABLE>
*Assuming reinvestment of all income dividends and capital gains distributions.

     A large part of our performance edge versus competitors over the period can
be explained by the same factor that  explained  our  outperformance  during the
1999 fiscal year:  cost.  Our fund has an expense  ratio  (annual  expenses as a
percentage  of average net assets) of 0.18%,  a fraction of the 1.03% charged by
the average long-term Florida municipal bond fund.  Because fund operating costs
are  deducted  directly  from the income  earned by a bond fund,  our fund has a
significant  edge in its quest to provide

                                       3
<PAGE>


IN SUMMARY

returns that are superior to those of similar funds. The combination of our cost
advantage and skillful management by Vanguard's Fixed Income Group has benefited
our  shareholders  since  the  fund's  inception  in 1992,  and we  expect it to
continue to do so in the future.

During a period when the stock market seems invulnerable,  it's easy to overlook
the  merits of bonds.  However,  bond funds must not be judged by how well their
returns  stack up against  those of stock funds in a particular  period,  but by
what they can add to a balanced investment program,  namely,  current income and
relative  stability.  Vanguard  Florida  Insured  Long-Term  Tax-Exempt Fund can
provide a high level of after-tax income,  particularly for those in high income
tax brackets,  and especially  compared with the income available from the stock
market,  whose  average  dividend  yield is less  than  1.5%.  And  because  the
performance of bonds often differs from that of equities,  a commitment to bonds
is a useful diversifier that can help smooth the  sometimes-volatile  returns of
stocks.
     We advise investors to hold balanced portfolios of stock funds, bond funds,
and short-term  reserves in proportions  suitable to their own investment goals,
time horizon,  and tolerance  for risk.  Once you have such a plan in place,  we
advise you to stick with it through good times and bad.



/S/ John J. Brennan
John J. Brennan
Chairman and Chief Executive Officer

December 27, 1999



================================================================================
A NOTE OF THANKS TO OUR FOUNDER
================================================================================
As you may have read on the inside  cover of our report,  our  founder,  John C.
Bogle,  is retiring  December  31, 1999,  as Senior  Chairman of our Board after
nearly 25 years of devoted  service to Vanguard and our  shareholders.  Vanguard
investors  have Jack to thank for  creating a truly  mutual  mutual fund company
that operates solely in the interest of its fund  shareholders.  And mutual fund
investors  everywhere have benefited from his energetic  efforts to improve this
industry.  Finally, on a personal note, I am forever grateful to Jack for giving
me the opportunity to join this great company in 1982.

                                       4

<PAGE>


THE MARKETS IN PERSPECTIVE
YEAR ENDED NOVEMBER 30, 1999

Strong economic  expansion sent global stock markets charging higher but dealt a
blow to bond  prices  during  the fiscal  year  ended  November  30,  1999.  The
powerhouse U.S. economy led the global growth parade, joined by Asian, European,
and Latin American economies that had slumped or stagnated in 1998.
     Interest  rates rose sharply as investors  and monetary  policymakers  grew
increasingly  worried that such strong  economic growth would cause inflation to
surge.  Although the rise in rates caused bond prices to fall,  it only tempered
the stock market's advance.

U.S. STOCK MARKETS

Against  the  backdrop  of a booming  economy,  U.S.  companies  reported  solid
increases in earnings  during the fiscal  year.  The  nation's  economic  output
increased  at an  inflation-adjusted  rate of 4.3%--a very rapid pace for such a
large, mature economy.  Consumer spending, which accounts for roughly two-thirds
of economic activity, powered the expansion.  Americans spent freely, encouraged
by rising  wealth  from a long  bull  market,  a hot job  market,  and  climbing
incomes.

- --------------------------------------------------------------------------------
                                                  AVERAGE ANNUAL RETURNS
                                             PERIODS ENDED NOVEMBER 30, 1999
- --------------------------------------------------------------------------------
                                             1 YEAR      3 YEARS     5 YEARS
- --------------------------------------------------------------------------------
STOCKS
S&P 500 Index                                  20.9%        24.3%       27.5%
Russell 2000 Index                             15.7         10.1        14.8
Wilshire 5000 Index                            22.4         22.6        25.6
MSCI EAFE Index                                21.4         12.3        11.4
- --------------------------------------------------------------------------------
BONDS
Lehman Aggregate Bond Index                     0.0%         5.6%        8.0%
Lehman 10 Year Municipal Bond Index            -0.4          4.8         7.6
Salomon Smith Barney 3-Month
    U.S. Treasury Bill Index                    4.7          5.0         5.2
- --------------------------------------------------------------------------------
OTHER
Consumer Price Index                            2.6%         2.0%        2.4%
- --------------------------------------------------------------------------------

     The stock  market,  as measured by the  Wilshire  5000 Index,  gained 22.4%
overall.  For a change,  mid-capitalization  and small-cap stocks outpaced their
large-cap  brethren.  The large-cap S&P 500 Index,  which accounts for more than
75% of the U.S. stock  market's  total value,  gained 20.9% during the year; the
rest of the market (as measured by the Wilshire 4500 Index) gained 29.0%.
     Increasingly  optimistic  expectations for future  corporate  earnings more
than offset the negative  effects of rising  interest  rates during fiscal 1999.
Higher rates often hurt stock prices because many investors use current rates to
discount the value of a stock's projected earnings and dividends. The higher the
interest rate, the more future earnings are  discounted,  and the less investors
will pay for the stock now.
     Because of a  remarkable  surge in prices  for  technology  stocks,  growth
stocks again  outperformed value stocks during the past year. Within the S&P 500
Index, growth stocks--characterized by high prices in relation to earnings, book
value, and  dividends--recorded  a 28.5% return,  16 percentage points above the
12.5% return for value  stocks.  The disparity was even greater in the small-cap
segment of the market;  growth stocks  within the  small-cap  Russell 2000 Index
gained 32.7%, while value stocks posted a -1.4% return.
     Technology  stocks within the S&P 500 Index gained 66%.  QUALCOMM posted an
eye-popping  1,200% return, and a number of  computer-related  stocks doubled or
tripled in

                                       5
<PAGE>

price,  including Sun  Microsystems  (+257%),  Apple  Computer  (+206%),  Oracle
(+197%), Gateway (+172%), Texas Instruments (+152%), and Cisco Systems (+136%).
     Big gains for wireless  telecommunications  and cable-TV stocks powered the
utilities  category  to an overall  gain of nearly  28%.  The  producer-durables
group, which includes some technology-related  manufacturers as well as aircraft
and  equipment  makers,  gained 27%. Oil  exploration  and service  firms in the
"other energy"  category  posted a 26% return,  assisted by a jump in prices for
oil and natural gas.
     The year's worst-performing sector was consumer staples (down nearly -12%).
This group suffered as severe price  competition and a stronger dollar in Europe
crimped profits for many food and beverage makers, and the specter of litigation
costs caused tobacco stocks to slump. The auto &  transportation  group declined
- -2% overall, with airline stocks hurt by rising prices for jet fuel.

U.S. BOND MARKETS

Stock  investors  may cheer a  fast-growing  economy,  but rapid growth tends to
worry   bond   investors.   Early  in  the   fiscal   year,   inflation   seemed
dormant--plunging  oil prices had taken  commodity  price  indexes to the lowest
point in a  quarter-century.  But as the  world  economy  began  hitting  on all
cylinders,  the bond  market  feared that a minuscule  U.S.  unemployment  rate,
rising  commodity  prices,  and capacity  constraints  would cause  inflation to
accelerate.  Although oil prices were up nearly 150% during the fiscal year, the
overall  price level,  as measured by the Consumer  Price Index,  increased by a
moderate 2.6%.
     The Federal Reserve Board, anticipating price pressures, abandoned its bias
toward easier monetary  policy,  and by mid-year was boosting  interest rates to
try to  throttle  back the  economic  engines.  The bond market was ahead of the
Fed--interest  rates began rising sharply in February.  By fiscal year-end,  the
yield of 30-year U.S. Treasury bonds had risen 1.23 percentage points (123 basis
points) to 6.29%. The 10-year Treasury note's yield rose 148 basis points,  from
4.71% to  6.19%.  The rise in  short-term  rates  was more  restrained;  3-month
Treasury bill yields were up 82 basis points to 5.30% at fiscal year-end.
     Bond prices fall when interest  rates rise,  and long-term  bond prices are
most sensitive to changing  rates.  Long-term  Treasury bond prices fell by more
than -13%, resulting in total returns of -8%. The Lehman Aggregate Bond Index, a
measure of the  overall  taxable  bond  market,  which has an  intermediate-term
structure  on average,  broke even on the year,  as interest  income of 6.2% was
offset by price declines.  The damage to municipal bond prices was not as severe
as for Treasuries,  and the intermediate-term Lehman 7 Year Municipal Bond Index
recorded a price decline of -3.7% and a total return of 0.5%.

INTERNATIONAL STOCK MARKETS

International  markets had a strong year,  with European stocks gaining 21.9% in
local-currency  terms  and  Pacific-region   stocks  advancing  30.2%.  However,
currency effects significantly altered the returns to U.S.-based investors.  The
U.S.  dollar rose in value  against most  European  currencies  but fell sharply
against the Japanese  yen. As a result,  returns from Europe  plunged to 9.8% in
dollar terms while returns from the Pacific soared to 51.0%.
     Overall,  U.S. investors earned 21.4% in the major developed  international
markets,  as  measured  by the  Morgan  Stanley  Capital  International  Europe,
Australasia,  Far East (EAFE)  Index.  The bull markets in most nations  stemmed
from renewed  optimism that economic growth would continue to accelerate.  Japan
and the rest of Asia,  which were hit hardest by currency and economic crises in
1997 and 1998, saw the biggest stock gains.
     Emerging  markets,  as measured by the Select Emerging  Markets Free Index,
gained 37.1% in  U.S.-dollar  terms,  as investors  regained an appetite for the
considerable risks of smaller markets.

                                       6
<PAGE>


REPORT FROM THE ADVISER

Interest  rates rose during the 12 months ended  November  30, 1999,  the fiscal
year for  Vanguard  Florida  Insured  Long-Term  Tax-Exempt  Fund.  The rise was
principally  due to investors'  fears about the impact of the strong economy and
the low unemployment  rate on inflation.  In the past, these factors have caused
inflation to increase, and many investors expect that history will repeat itself
at some point.  So far,  employment  costs and consumer  price  indexes have not
risen substantially, but each number is being closely watched for any upsurge. A
desire to head off inflation and concerns about the booming stock market led the
Federal  Reserve Board to increase  interest rates three times during the fiscal
year, raising the federal funds rate by a total of 0.75 percentage point.
     As you might expect, yields of insured long-term municipal bonds rose along
with yields on U.S.  Treasury bonds during fiscal 1999. During the first half of
the  year,   long-term  insured   municipals   performed  better  than  Treasury
securities;  municipal  yields  increased by less than half as much as those for
long-term  Treasuries.  But the  relative  performance  flip-flopped  during the
second half, when yields on long-term  municipals increased almost 11/2 times as
much as those on long  Treasuries.  Over the full fiscal year,  the yield on the
benchmark  30-year U.S. Treasury bond rose by 1.23 percentage points (from 5.06%
to 6.29%),  while the yield of a similar AAA-rated municipal bond rose by nearly
1 percentage point (from 4.89% to 5.87%).
     Two factors account for the first-half  outperformance of insured municipal
bonds and for their later  underperformance.  First, as the fiscal year began in
December 1998, insured municipal bonds were especially  attractive to investors,
because the AAA-rated insured municipal's  tax-exempt yield of 4.9% was equal to
97% of the yield of a 30-year Treasury.  For an investor in the top marginal tax
bracket of 39.6%,  that 4.9% yield was  equivalent to an 8.1% yield on a taxable
bond.  By May  31,  the  middle  of  our  fiscal  year,  the  long-term  insured
municipal's yield was about 89% as high as the 30-year Treasury's yield,  making
insured  municipal  bonds somewhat less alluring.  The second factor was that in
the second  half of the fiscal  year,  corporate  bond  yields had become  quite
attractive,  providing stiff competition for the bond investor's dollar.  During
this  period  the  corporate  bond  market  encountered  the same type of supply
imbalance  that the municipal  market had seen in fiscal 1998,  as  corporations
rushed bond issues to market to complete their  financing  before the end of the
century.  The result was  attractively  high  yields on  corporate  debt,  which
enticed  some large  institutional  buyers away from the  municipal  market.  At
year-end,  yields on long-term  insured municipal bonds had risen in relation to
those on Treasuries,  and 30-year munis offered yields equal to 94% of yields on
30-year Treasuries.


- --------------------------------------------------------------------------------
INVESTMENT PHILOSOPHY
The fund  reflects  a belief  that a high level of current  income  exempt  from
federal  income  tax  and  Florida's  intangible  personal  property  tax can be
achieved by  investing  primarily in  long-term  insured  bonds issued by state,
county, and municipal governments in Florida.
- --------------------------------------------------------------------------------

     The  municipal  market  was aided by the fact that the supply of new issues
was lower  during 1999 than in 1998.  Through  November,  issuance of  municipal
securities in 1999  amounted to $207  billion,  down more than 20% from the same
period in 1998.  The main  reason  for the  decline  was a 53%  decrease  in the
issuance  of  refunding  bonds,  whose  proceeds  are  used  to pay  off  older,
higher-coupon bonds. Because of the rise

                                       7
<PAGE>

in interest rates,  refunding  issues generally did not make fiscal sense during
1999.  As the economy  continued  to expand,  the supply of bonds issued for new
projects was unchanged from 1998.

THE FUND'S FISCAL-YEAR PERFORMANCE

Long-term  bonds  typically are hurt most by rising interest rates. As a result,
the Florida Insured Long-Term  Tax-Exempt Fund suffered a price decline of -6.5%
and posted a total  return of -1.9%.  Although  negative  returns are never good
news,  this result  actually was strong in comparison  with  competitors,  whose
average  return was -3.9%.  Our edge over the  average  peer fund was due to the
combination  of  Vanguard's  disciplined  approach to risk and our low operating
expenses.
     We  scrutinize  various  bond  maturities  to find the best values for each
level of interest rate risk. Our focus on keeping expenses low is always helpful
and is critical in delivering  above-average  tax-exempt income,  since expenses
are  deducted  directly  from a bond fund's  interest  income.  Our  emphasis on
keeping the fund invested in high-quality  securities  benefits our shareholders
by reducing  credit risk.  The overall  effect of  combining  low costs and high
quality is to provide to our  shareholders  both superior  yields and low credit
risk, the ingredients of excellent risk-adjusted returns.

Ian A. MacKinnon, Managing Director
Christopher M. Ryon, Principal
Pamela Wisehaupt Tynan, Principal
Reid O. Smith, Principal
Vanguard Fixed Income Group

December 13, 1999

                                       8

<PAGE>


PERFORMANCE SUMMARY
FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND

All of the data on this page represent past performance, which cannot be used to
predict  future returns that may be achieved by the fund.  Note,  too, that both
share  price and  return  can  fluctuate  widely.  An  investor's  shares,  when
redeemed, could be worth more or less than their original cost.

TOTAL INVESTMENT RETURNS: SEPTEMBER 1, 1992-NOVEMBER 30, 1999
- --------------------------------------------------------------------------------
                         FLORIDA INSURED LONG-TERM
                             TAX-EXEMPT FUND                     LEHMAN*
FISCAL                CAPITAL    INCOME    TOTAL                  TOTAL
YEAR                  RETURN     RETURN    RETURN                RETURN
- --------------------------------------------------------------------------------
1992                  1.6%        1.2%      2.8%                  1.8%
1993                  6.9         5.5      12.4                  11.1
1994                -11.0         4.9      -6.1                  -5.2
1995                 13.8         6.3      20.1                  18.9
1996                  1.2%        5.3%      6.5%                  5.9%
1997                  1.3         5.2       6.5                   7.2
1998                  2.9         5.1       8.0                   7.8
1999                 -6.5         4.6      -1.9                  -1.1
- --------------------------------------------------------------------------------
*Lehman Municipal Bond Index.
See  Financial  Highlights  table  on page 18 for  dividend  and  capital  gains
information for the past five years.

CUMULATIVE PERFORMANCE: SEPTEMBER 1, 1992-NOVEMBER 30, 1999
- --------------------------------------------------------------------------------
         199211         10284         10196         10179
         199302         11020         10901         10778
         199305         11087         10930         10833
         199308         11489         11382         11257
         199311         11558         11442         11307
         199402         11621         11463         11375
         199405         11403         11063         11100
         199408         11500         11145         11277
         199411         10855         10475         10716
         199502         12057         11514         11593
         199505         12475         12077         12115
         199508         12465         12008         12278
         199511         13031         12592         12742
         199602         13230         12645         12874
         199605         12950         12475         12669
         199608         13241         12614         12921
         199611         13872         13183         13492
         199702         13921         13187         13584
         199705         14066         13405         13718
         199708         14440         13685         14116
         199711         14779         14036         14459
         199802         15158         14394         14825
         199805         15359         14660         15004
         199808         15724         14862         15337
         199811         15966         15077         15581
         199902         16167         15189         15737
         199905         16036         15195         15705
         199908         15687         14611         15414
         199911         15668         14491         15414


<TABLE>
<CAPTION>
                                               AVERAGE ANNUAL TOTAL RETURNS
                                              PERIODS ENDED NOVEMBER 30, 1999
                                             -----------------------------------
<S>                                               <C>    C>              <C>              <C>
                                                                        SINCE             FINAL VALUE OF A
                                                1 YEAR   5 YEARS      INCEPTION          $10,000 INVESTMENT
- -----------------------------------------------------------------------------------------------------------
Florida Insured Long-Term Tax-Exempt Fund       -1.87%    7.62%         6.39%                  $15,668
Average Florida Insured Municipal Fund*         -3.89     6.71          5.25                    14,491
Lehman Municipal Bond Index                     -1.07     7.54          6.15                    15,414
- -----------------------------------------------------------------------------------------------------------
*Derived from data provided by Lipper Inc.
</TABLE>

<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED SEPTEMBER 30, 1999*
- -----------------------------------------------------------------------------------------------------------
<S>                                             <C>      <C>       <C>       <C>          <C>         <C>
                                             INCEPTION                              SINCE INCEPTION
                                                                                ---------------------------
                                               DATE     1 YEAR    5 YEARS    CAPITAL      INCOME      TOTAL
- -----------------------------------------------------------------------------------------------------------
Florida Insured Long-Term Tax-Exempt Fund    9/1/1992   -1.97%      6.74%     1.26%        5.26%      6.52%
- -----------------------------------------------------------------------------------------------------------
</TABLE>
*SEC rules require that we provide this average annual total return  information
through the latest calendar quarter.

                                       9

<PAGE>


FUND PROFILE
FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND

This Profile  provides a snapshot of the fund's  characteristics  as of November
30, 1999, compared where appropriate to an unmanaged index. Key elements of this
Profile are defined on page 11.

FINANCIAL ATTRIBUTES
- -----------------------------------------------------------------------
                                   FLORIDA INSURED               LEHMAN
                                         LONG-TERM               INDEX*
- -----------------------------------------------------------------------
Number of Issues                               167               52,144
Yield                                         5.1%                   --
Yield to Maturity                             5.3%                   --
Average Coupon                                5.3%                 5.5%
Average Maturity                        12.7 years           13.0 years
Average Quality                                AAA                  AA+
Average Duration                         8.4 years            7.5 years
Expense Ratio                                0.18%                   --
Cash Reserves                                 1.1%                   --
*Lehman Municipal Bond Index.

INVESTMENT FOCUS
- ------------------------------
[GRID]
AVERAGE MATURITY         LONG
CREDIT QUALITY           HIGH



VOLATILITY MEASURES
- -----------------------------------------------------------------------
                                   FLORIDA INSURED               LEHMAN
                                         LONG-TERM               INDEX*
- -----------------------------------------------------------------------
R-Squared                                     0.98                 1.00
Beta                                          1.16                 1.00

*Lehman Municipal Bond Index.


DISTRIBUTION BY CREDIT QUALITY
(% OF PORTFOLIO)
- --------------------------------------------------
AAA                                          95.1%
AA                                             4.9
A                                              0.0
BBB                                            0.0
BB                                             0.0
B                                              0.0
Total                                       100.0%

DISTRIBUTION BY MATURITY
(% OF PORTFOLIO)
- --------------------------------------------------
Under 1 Year                                  4.8%
1-5 Years                                      9.0
5-10 Years                                    22.2
10-20 Years                                   51.8
20-30 Years                                   11.8
Over 30 Years                                  0.4
Total                                       100.0%

                                       10
<PAGE>



AVERAGE COUPON. The average interest rate paid on the securities held by a fund.
It is expressed as a percentage of face value.

AVERAGE  DURATION.  An  estimate  of how much a bond  fund's  share  price  will
fluctuate in response to a change in interest  rates. To see how the price could
shift,  multiply the fund's  duration by the change in rates.  If interest rates
rise by one percentage point, the share price of a fund with an average duration
of five years  would  decline  by about 5%. If rates  decrease  by a  percentage
point, the fund's share price would rise by 5%.

AVERAGE  MATURITY.  The average  length of time until bonds held by a fund reach
maturity  (or are  called) and are  repaid.  In general,  the longer the average
maturity, the more a fund's share price will fluctuate in response to changes in
market interest rates.

AVERAGE QUALITY.  An indicator of credit risk, this figure is the average of the
ratings assigned to a fund's securities holdings by credit-rating  agencies. The
agencies make their  judgment after  appraising an issuer's  ability to meet its
obligations.  Quality is graded on a scale,  with Aaa or AAA indicating the most
creditworthy  bond  issuers and A-1 or MIG-1  indicating  the most  creditworthy
issuers of money market securities.

BETA. A measure of the magnitude of a fund's past  share-price  fluctuations  in
relation  to the ups and downs of the  overall  market  (or  appropriate  market
index).  The market (or index) is assigned a beta of 1.00, so a fund with a beta
of 1.20  would have seen its share  price  rise or fall by 12% when the  overall
market rose or fell by 10%.

CASH  RESERVES.  The  percentage  of a  fund's  net  assets  invested  in  "cash
equivalents"--highly  liquid,  short-term,   interest-bearing  securities.  This
figure does not include  cash  invested in futures  contracts  to simulate  bond
investment.

DISTRIBUTION BY CREDIT QUALITY.  This breakdown of a fund's securities by credit
rating can help in gauging the risk that  returns  could be affected by defaults
or other credit problems.

DISTRIBUTION BY MATURITY.  An indicator of interest-rate  risk. In general,  the
higher the  concentration  of  longer-maturity  issues,  the more a fund's share
price will fluctuate in response to changes in interest rates.

EXPENSE  RATIO.  The  percentage of a fund's  average net assets used to pay its
annual  administrative  and advisory  expenses.  These expenses  directly reduce
returns to investors.  Investment Focus. This grid indicates the focus of a fund
in terms of two  attributes:  average  maturity  (short,  medium,  or long)  and
average credit quality (high, medium, or low).

NUMBER OF ISSUES.  An indicator of  diversification.  The more separate issues a
fund holds,  the less  susceptible  it is to a price  decline  stemming from the
problems of a particular issue.

R-SQUARED.  A measure of how much of a fund's past  returns can be  explained by
the returns from the overall market (or its benchmark  index). If a fund's total
return  were  precisely  synchronized  with the  overall  market's  return,  its
R-squared  would  be 1.00.  If a  fund's  returns  bore no  relationship  to the
market's returns, its R-squared would be 0.

YIELD.  A  snapshot  of a fund's  interest  income.  The yield,  expressed  as a
percentage  of the fund's net asset  value,  is based on income  earned over the
past 30 days and is annualized, or projected forward for the coming year.

YIELD  TO  MATURITY.  The  rate of  return  an  investor  would  receive  if the
securities held by a fund were held to their maturity dates.

                                       11
<PAGE>



FINANCIAL STATEMENTS
NOVEMBER 30, 1999

STATEMENT OF NET ASSETS
This Statement  provides a detailed list of the fund's  municipal bond holdings,
including each security's  market value on the last day of the reporting  period
and  information  on credit  enhancements  (insurance  or  letters  of  credit).
Securities are grouped and  subtotaled  according to their insured or noninsured
status.  Other assets are added to, and  liabilities  are  subtracted  from, the
value of Total Municipal Bonds to calculate the fund's Net Assets.  Finally, Net
Assets are divided by the outstanding  shares of the fund to arrive at its share
price, or Net Asset Value (NAV) Per Share.
     At the end of the Statement of Net Assets, you will find a table displaying
the  composition of the fund's net assets on both a dollar and per-share  basis.
Undistributed Net Investment Income is usually zero because the fund distributes
its net income to  shareholders  as a dividend each day. Any realized gains must
be distributed  annually,  so the bulk of net assets consists of Paid in Capital
(money invested by shareholders). The balance shown for Accumulated Net Realized
Gains usually approximates the amount available to distribute to shareholders as
taxable  capital gains as of the statement  date, but may differ because certain
investments or transactions may be treated  differently for financial  statement
and tax purposes. Any Accumulated Net Realized Losses, and any cumulative excess
of  distributions  over net realized  gains,  will appear as negative  balances.
Unrealized  Appreciation  (Depreciation) is the difference  between the value of
the fund's  investments  and their cost,  and reflects the gains  (losses)  that
would be  realized  if the fund  were to sell  all of its  investments  at their
statement-date values.

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>          <C>             <C>             <C>
                                                                                                 FACE    MARKET
                                                                        MATURITY               AMOUNT    VALUE*
FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND                    COUPON         DATE                (000)     (000)
- ---------------------------------------------------------------------------------------------------------------
MUNICIPAL BONDS (98.9%)
- ---------------------------------------------------------------------------------------------------------------
ISSUER INSURED (90.8%)
Alachua County FL Health Fac. Auth. (Shands Teaching Hosp.)   6.25%    12/1/2011 (1)           $3,095    $3,340
Alachua County FL Health Fac. Auth. (Shands Teaching Hosp.)   6.25%    12/1/2016 (1)            8,695     9,247
Alachua County FL Health Fac. Auth. VRDO (
     Shands Teaching Hosp.)                                   3.85%    12/8/1999 (1)            3,000     3,000
Boynton Beach FL Util. System Rev.                            6.25%    11/1/2020 (3)            2,085     2,126
Boynton Beach FL Util. System Rev.                            6.25%    11/1/2020 (3)(ETM)         415       441
Brevard County FL Health Fac. (Holmes Medical Center)        5.625%    10/1/2014 (1)            3,000     3,016
Broward County FL Airport System Rev.                        5.125%    10/1/2018 (2)            5,000     4,573
Broward County FL Airport System Rev.                         5.25%    10/1/2012 (1)           14,735    14,464
Broward County FL Solid Waste Rev.                            5.75%     7/1/2013 (1)            4,130     4,205
Canaveral FL Port Auth.                                       6.00%     6/1/2006 (3)            1,000     1,045
Collier County FL COP                                         6.25%    2/15/2013 (4)           12,500    13,579
Coral Springs FL Improvement Dist. Water & Sewer GO           6.00%     6/1/2010 (1)            4,250     4,479
Dade County FL Health Fac. Auth. Rev. (Miami Baptist Hosp.)   5.25%    5/15/2013 (1)            5,500     5,391
Dade County FL School Board COP                               5.60%     8/1/2006 (2)(Prere.)   22,420    23,595
Dade County FL School Board COP                               5.70%     8/1/2006 (2)(Prere.)    4,300     4,550
Dade County FL School Dist. GO                                5.00%    2/15/2017 (1)           19,000    17,357
Dade County FL School Dist. GO                               6.875%     8/1/2002 (1)            5,000     5,312
Dade County FL Seaport GO                                     6.25%    10/1/2001 (2)(Prere.)    2,000     2,089
Dade County FL Seaport GO                                     6.50%    10/1/2001 (2)(Prere.)    4,090     4,290
Dade County FL Solid Waste System Rev.                        6.00%    10/1/2007 (2)            8,700     9,292
Dade County FL Water & Sewer System Rev.                      5.25%    10/1/2011 (3)            4,000     4,018
Dade County FL Water & Sewer System Rev.                      5.25%    10/1/2012 (3)            6,000     5,977
Dade County FL Water & Sewer System Rev.                      6.25%    10/1/2009 (3)            1,500     1,642
Dade County FL Water & Sewer System Rev. VRDO                 3.60%    12/8/1999 (3)            5,480     5,480
Davie FL Water & Sewer Rev.                                  6.375%    10/1/2012 (2)            2,500     2,762
Dunedin FL Util. System. Rev.                                 6.75%    10/1/2008 (3)            1,115     1,251
Dunedin FL Util. System. Rev.                                 6.75%    10/1/2010 (3)            2,465     2,800
Florida Board of Educ. Lottery Rev.                           5.00%     7/1/2016 (3)           16,800    15,430
Florida Board of Educ. Lottery Rev.                           5.00%     7/1/2017 (3)            8,000     7,275
Florida Board of Educ. Rev. (Capital Outlay)                  5.00%     6/1/2015 (3)            9,355     8,723
</TABLE>


                                       12
<PAGE>
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>          <C>                <C>          <C>
                                                                                                 FACE    MARKET
                                                                        MATURITY               AMOUNT    VALUE*
                                                             COUPON         DATE                (000)     (000)
- ---------------------------------------------------------------------------------------------------------------
Florida Board of Educ. Rev. (Capital Outlay)                  5.00%     6/1/2017 (3)          $10,380    $9,475
Florida Dept. of General Services Rev.
(Dept. of Environmental Protection Preservation-2000)         5.00%     7/1/2011 (2)            2,000     1,967
Florida Dept. of General Services Rev.
(Dept. of Environmental Protection Preservation-2000)         5.75%     7/1/2013 (2)            2,585     2,636
Florida Gas Util. Rev. (Gas Project)                          5.00%    12/1/2008 (4)            7,500     7,522
Florida Muni. Power Agency                                    6.25%    10/1/2002 (2)(Prere.)    4,500     4,801
Florida Muni. Power Agency (Tri-City Project)                 5.00%    10/1/2010 (2)            4,340     4,283
Florida Muni. Power Agency VRDO (Stanton Project)             3.90%    12/8/1999 (1)            3,405     3,405
Florida Turnpike Auth. Rev.                                   5.00%     7/1/2014 (1)            5,000     4,742
Florida Turnpike Auth. Rev.                                   5.00%     7/1/2015 (1)            7,435     6,945
Florida Turnpike Auth. Rev.                                   5.00%     7/1/2017 (1)            8,165     7,467
Florida Turnpike Auth. Rev.                                   5.00%     7/1/2023 (1)           10,000     8,826
Greater Orlando FL Aviation Auth.                             5.25%    10/1/2012 (3)           18,245    17,910
Greater Orlando FL Aviation Auth.                             6.10%    10/1/2006 (2)            2,500     2,642
Hillsborough County FL IDA (Univ. Community Hosp.)            6.50%    8/15/2019 (1)           17,850    19,459
Hillsborough County FL School Board COP                       5.25%     7/1/2017 (1)           12,000    11,278
Hillsborough County FL School Board COP                      5.625%     7/1/2005 (2)(Prere.)    6,500     6,892
Hillsborough County FL School Board COP                       6.00%     7/1/2025 (1)           19,000    19,326
Indian River County FL Water & Sewer Rev.                     5.25%     9/1/2018 (3)            6,415     6,021
Indian River County FL Water & Sewer Rev.                     6.50%     9/1/2008 (3)            2,540     2,803
Jacksonville FL Entitlement Rev.                              5.50%    10/1/2012 (2)            4,900     4,945
Lakeland FL Electric & Water Rev.                             0.00%    10/1/2010 (1)            8,260     4,671
Lakeland FL Electric & Water Rev.                             0.00%    10/1/2011 (1)            8,420     4,471
Lakeland FL Electric & Water Rev.                             0.00%    10/1/2012 (1)            6,520     3,241
Lakeland FL Electric & Water Rev.                             5.00%    10/1/2028 (1)            6,000     5,211
Lee County FL School Board COP                                6.00%     8/1/2007 (4)            5,820     6,217
Lee County FL School Board COP                                6.00%     8/1/2008 (4)            6,180     6,610
Marion County FL Hosp. Dist.
     (Munroe Regional Medical Center)                         6.20%    10/1/2007 (3)            1,000     1,065
Martin County FL Health Fac. Auth. Hosp. Rev.
(Martin Memorial Medical Center)                              5.00%   11/15/2028 (2)            6,500     5,580
Melbourne FL Water & Sewer Rev.                              6.375%    10/1/2012 (3)            1,000     1,060
Miami Beach FL Health Fac. Auth. (Mt. Sinai Medical Center)  6.125%   11/15/2014 (4)            1,250     1,308
Miami Beach FL Health Fac. Auth. (Mt. Sinai Medical Center)   6.25%   11/15/2008 (4)            2,000     2,125
Miami FL GO                                                   5.90%    12/1/2008 (3)            1,000     1,070
Miami FL GO                                                   6.00%    12/1/2009 (3)            1,380     1,488
Miami-Dade County FL Aviation Rev.                            5.25%    10/1/2007 (3)           10,000    10,089
Miami-Dade County FL Public Fac. Rev. (Jackson Memorial Hosp.)5.25%     6/1/2010 (4)            2,815     2,822
Miami-Dade County FL Public Fac. Rev. (Jackson Memorial Hosp.)5.25%     6/1/2011 (4)            2,950     2,935
Miami-Dade County FL Public Fac. Rev. (Jackson Memorial Hosp.)5.25%     6/1/2012 (4)            3,120     3,075
Miami-Dade County FL Public Fac. Rev. (Jackson Memorial Hosp.)5.25%     6/1/2013 (4)            3,160     3,080
Miami-Dade County FL School Board COP                         5.00%     8/1/2025 (4)            6,000     5,212
Miami-Dade County FL School Board COP                         5.25%     8/1/2008 (2)            8,430     8,576
Miami-Dade County FL School Board COP                         5.25%     8/1/2011 (2)           12,790    12,810
Miramar FL Wastewater Improvement Assessment Refunding        5.00%    10/1/2019 (1)            3,540     3,159
Miramar FL Wastewater Improvement Assessment Refunding        5.00%    10/1/2025 (1)            2,50      2,185
North Broward FL Hosp. Dist. Rev.                             5.25%    1/15/2017 (1)            3,500     3,285
North Broward FL Hosp. Dist. Rev.                            5.375%    1/15/2013 (1)            1,750     1,738
North Broward FL Hosp. Dist. Rev.                             5.75%    1/15/2007 (1)            2,560     2,685
Ocala FL Water & Sewer Rev.                                   5.50%    10/1/2015 (2)            4,550     4,521
Ocala FL Water & Sewer Rev.                                   6.00%    10/1/2005 (2)            2,565     2,685
Ocala FL Water & Sewer Rev.                                   6.00%    10/1/2010 (2)            2,435     2,618
Orange County FL Health Fac. Auth.
     (Adventist for Sunbelt Group)                            5.50%   11/15/2015 (2)            1,250     1,224
Orange County FL Health Fac. Auth.
     (Adventist for Sunbelt Group                             6.25%   11/15/2008 (2)            4,570     4,910
Orange County FL Health Fac. Auth.
     (Adventist for Sunbelt Group)                            6.25%   11/15/2010 (2)            6,015     6,386
Orange County FL Health Fac. Auth.
     (Orlando Regional Health                                 6.25%    10/1/2009 (1)            2,045     2,218
Orange County FL Health Fac. Auth.
     (Orlando Regional Health)                                6.25%    10/1/2009 (1)(ETM)       4,935     5,397
Orange County FL Health Fac. Auth.
     (Orlando Regional Health)                                6.25%    10/1/2010 (1)            2,175     2,364
Orange County FL Health Fac. Auth.
     (Orlando Regional Health)                                6.25%    10/1/2010 (1)(ETM)       5,260     5,754
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2011 (1)            1,145     1,245
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2011 (1)(ETM)       2,765     3,009
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2013 (1)            1,890     2,043
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2013 (1)(ETM)       3,160     3,422
</TABLE>
                                       13

<PAGE>
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>          <C>             <C>             <C>
                                                                                                 FACE    MARKET
                                                                        MATURITY               AMOUNT    VALUE*
FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND                    COUPON         DATE                (000)     (000)
- ---------------------------------------------------------------------------------------------------------------
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2016 (1)         $  1,610   $ 1,723
Orange County FL Health Fac. Auth. (Orlando Regional Health   6.25%    10/1/2016 (1)(ETM)       3,890     4,172
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2018 (1)            4,770     5,070
Orange County FL Health Fac. Auth. (Orlando Regional Health)  6.25%    10/1/2021 (1)            6,500     6,892
Orange County FL Sales Tax Rev.                              5.125%     1/1/2028 (3)            8,000     7,094
Orange County FL School Dist. COP                            5.375%     8/1/2017 (1)            7,590     7,284
Orange County FL School Dist. COP                            5.375%     8/1/2022 (1)            6,880     6,423
Orange County FL School Dist. COP                             6.00%     8/1/2011 (1)            6,000     6,437
Orange County FL Solid Waste Rev.                            6.375%    10/1/2017 (3)            3,500     3,658
Orange County FL Tourist Dev. Rev.                            5.90%    10/1/2010 (1)            1,250     1,335
Orange County FL Tourist Dev. Rev.                            6.50%    10/1/2002 (2)(Prere.)    4,000     4,291
Orlando & Orange County FL Expressway Auth. Rev.             5.375%     7/1/2011 (2)            5,000     5,044
Orlando & Orange County FL Expressway Auth. Rev.              6.50%     7/1/2010 (3)            2,000     2,234
Osceola County FL Gas Tax Rev.                                5.90%     4/1/2008 (3)            1,805     1,884
Palm Beach County FL Criminal Justice Fac. Rev.              5.375%     6/1/2008 (3)            2,375     2,446
Palm Beach County FL Criminal Justice Fac. Rev.               7.20%     6/1/2015 (3)            3,000     3,510
Palm Beach County FL Solid Waste Auth. Rev.                   6.00%    10/1/2007 (2)           10,000    10,695
Pinellas County FL Health Fac. Auth. (Morton Plant Hosp.)     5.25%   11/15/2012 (1)            2,705     2,680
Pinellas County FL Sewer Rev.                                 5.00%    10/1/2024 (3)            9,500     8,336
Sarasota County FL Util. System Rev.                          5.75%    10/1/2012 (3)            4,325     4,412
Sarasota County FL Util. System Rev.                          7.00%    10/1/2009 (3)            6,260     7,165
Seacoast FL Util. Auth. Water & Sewer Rev.                    5.50%     3/1/2010 (3)            2,500     2,529
Seacoast FL Util. Auth. Water & Sewer Rev.                    5.50%     3/1/2013 (3)            4,000     4,011
Seacoast FL Util. Auth. Water & Sewer Rev.                    5.50%     3/1/2017 (3)            2,400     2,366
Seacoast FL Util. Auth. Water & Sewer Rev.                    5.50%     3/1/2019 (3)            1,595     1,552
Seminole County FL School Board COP                          6.125%     7/1/2004 (1)(Prere.)    3,500     3,774
Seminole County FL School Board COP                           6.50%     7/1/2004 (1)(Prere.)    2,750     2,986
Seminole County FL Water & Sewer Rev.                         6.00%    10/1/2009 (1)            1,800     1,935
Seminole County FL Water & Sewer Rev.                         6.00%    10/1/2012 (1)            5,000     5,351
Seminole County FL Water & Sewer Rev.                         6.00%    10/1/2019 (1)            2,350     2,442
Seminole County FL Water & Sewer Rev.                         6.00%    10/1/2019 (1)(ETM)       5,150     5,307
South Miami FL Health Fac. Auth. Hosp. Rev.
(Baptist Health Systems Obligations Group)                    5.00%   11/15/2028 (1)           10,000     8,585
St. Lucie County FL Util. System Rev.                         5.50%    10/1/2015 (3)(ETM)       5,000     4,984
St. Lucie County FL Util. System Rev.                         6.00%    10/1/2020 (3)(ETM)       3,165     3,214
St. Lucie County FL Util. System Rev.                         6.50%    10/1/2008 (1)(ETM)       4,910     5,345
Sunrise FL Util. System Rev.                                  5.20%    10/1/2022 (2)           17,805    16,272
Sunrise FL Util. System Rev.                                  5.75%    10/1/2006 (2)(Prere.)    2,000     2,119
Tallahassee FL Energy System Rev.                             5.00%    10/1/2028 (4)            6,000     5,211
Tallahassee FL Energy System Rev.                             5.25%    10/1/2013 (4)            4,730     4,688
Tallahassee FL Energy System Rev.                             5.25%    10/1/2014 (4)            3,980     3,895
Tallahassee FL Energy System Rev.                             5.25%    10/1/2015 (4)            5,240     5,065
Tamarac FL Water & Sewer Util. Rev.                           5.90%    10/1/2011 (3)            3,980     4,253
Tampa Bay FL Water Util. System Rev.                          0.00%    10/1/2004 (3)           11,905     9,465
Tampa Bay FL Water Util. System Rev.                          0.00%    10/1/2005 (3)           10,000     7,539
Tampa Bay FL Water Util. System Rev.                          0.00%    10/1/2006 (3)           11,040     7,877
Tampa Bay FL Water Util. System Rev.                          0.00%    10/1/2007 (3)            3,105     2,093
Tampa Bay FL Water Util. System Rev.                          5.50%    10/1/2017 (3)            5,000     4,900
Tampa Bay FL Water Util. System Rev.                          6.00%    10/1/2024 (3)           15,250    15,533
Tampa FL Health System Rev.
(Allegany Health System-St. Mary's Hosp.)                     5.00%    12/1/2012 (1)(ETM)       7,380     7,181
Tampa FL Health System Rev. (Catholic Healthcare East)        5.25%   11/15/2011 (1)            4,575     4,575
Tampa FL Health System Rev. (Catholic Healthcare East)        5.25%   11/15/2012 (1)            3,385     3,354
Tampa FL Health System Rev. (Catholic Healthcare East)        5.25%   11/15/2013 (1)            4,365     4,276
Tampa FL Health System Rev. (Catholic Healthcare East)        5.50%   11/15/2004 (1)            1,000     1,038
Tampa FL Health System Rev. (Catholic Healthcare East)        5.50%   11/15/2012 (2)            6,000     6,089
Tampa FL Health System Rev. (Catholic Healthcare East)        5.50%   11/15/2013 (2)            2,800     2,824
Tampa FL Health System Rev. (Catholic Healthcare East)        5.50%   11/15/2014 (2)            1,000       999
Tampa FL Hillsborough County Expressway Auth. Rev.            6.00%     7/1/2004 (2)            4,980     5,274
Tampa FL Hillsborough County Expressway Auth. Rev.            6.50%     7/1/2002 (2)            4,130     4,346
Tampa FL Water & Sewer Rev.                                   6.25%    10/1/2012 (3)            5,805     6,093
</TABLE>
                                       14


<PAGE>

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------
<S>                                                            <C>          <C>             <C>             <C>
                                                                                                 FACE    MARKET
                                                                        MATURITY               AMOUNT    VALUE*
                                                             COUPON         DATE                (000)     (000)
- ---------------------------------------------------------------------------------------------------------------
Titusville FL Water & Sewer Rev.                              6.00%    10/1/2004 (1)(Prere.)    2,500     2,690
West Palm Beach FL Public Service Tax Rev.                   6.125%     3/1/2002 (1)(Prere.     1,560     1,632
                                                                                                     ----------
                                                                                                        794,105
                                                                                                     ----------
NONINSURED (8.1%)
Collier County FL Health Fac. Auth. Hosp. Rev. VRDO
(Cleveland Clinic Obligated Group)                            3.70%    12/2/1999                5,500     5,500
Florida Board of Educ. Rev.                                   5.00%     6/1/2012                6,000     5,821
Florida Board of Educ. Rev.                                   6.75%     6/1/2001 (Prere.)       2,000     2,092
Florida Housing Finance Agency                                6.25%     7/1/2011                1,415     1,444
Florida Housing Finance Agency                                6.35%     7/1/2014                1,795     1,831
Gainesville FL Util. System Rev.                              6.50%    10/1/2012                1,500     1,679
Hillsborough County FL IDA PCR VRDO
     (Tampa Electric Co. Project)                             3.80%    12/2/1999                2,550     2,550
Jacksonville FL Electric Auth. Rev.                           5.00%    10/1/2023               14,940    13,074
Jacksonville FL Electric Auth. Rev.                           5.10%    10/1/2032                4,445     3,841
Jacksonville FL PCR VRDO (Florida Power & Light Co. Project)  3.80%    12/2/1999                2,100     2,100
Lakeland FL Electric & Water Rev.                             6.05%    10/1/2014                2,000     2,123
Lakeland FL Electric & Water Rev.                             6.55%    10/1/2009                4,000     4,454
Orlando FL Util. Comm. Rev.                                   6.75%    10/1/2017               11,700    13,084
St. Lucie County FL PCR VRDO (Florida Power & Light Co.)      3.80%    12/2/1999                8,835     8,835
Tallahassee FL Consolidated Util. System Rev.                 6.20%    10/1/2019                2,000     2,044
                                                                                                     ----------
                                                                                                         70,472
                                                                                                     ----------
</TABLE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------
<S>                                                                                               <C>
TOTAL MUNICIPAL BONDS
  (Cost $879,168)                                                                             864,577
- -----------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (1.1%)
- -----------------------------------------------------------------------------------------------------
Other Assets--Note B                                                                           12,665
Liabilities                                                                                   (2,632)
                                                                                  -------------------
                                                                                               10,033
- -----------------------------------------------------------------------------------------------------
NET ASSETS (100%)
- -----------------------------------------------------------------------------------------------------
Applicable to 81,736,285 outstanding $.001 par value shares of beneficial interest
(unlimited authorization)                                                                    $874,610
=====================================================================================================
NET ASSET VALUE PER SHARE                                                                      $10.70
=====================================================================================================
*See Note A in Notes to Financial Statements.
For key to abbreviations and other references, see below.

</TABLE>

<TABLE>
<CAPTION>

- -----------------------------------------------------------------------------------------------------
AT NOVEMBER 30, 1999, NET ASSETS CONSISTED OF:
- -----------------------------------------------------------------------------------------------------
<S>                                                                          <C>                  <C>
                                                                          AMOUNT                  PER
                                                                           (000)                SHARE
- -----------------------------------------------------------------------------------------------------
Paid in Capital                                                         $891,994               $10.91
Undistributed Net Investment Income                                           --                   --
Overdistributed Net Realized Gains--Note E                                (2,793)                (.03)
Unrealized Depreciation--Note F                                          (14,591)                (.18)

- -----------------------------------------------------------------------------------------------------
NET ASSETS                                                              $874,610               $10.70
=====================================================================================================
</TABLE>

KEY TO ABBREVIATIONS

COP--Certificate of Participation.
GO--General Obligation.
IDA--Industrial Development Authority Bond.
PCR--Pollution Control Revenue.
VRDO--Variable Rate Demand Obligation.
(ETM)--Escrowed to Maturity.
(Prere.)--Prerefunded.

Scheduled principal and interest payments are
guaranteed by:
(1) MBIA (Municipal Bond Insurance Association).
(2) AMBAC (Ambac Assurance Corporation).
(3) FGIC (Financial Guaranty Insurance Company).
(4) FSA (Financial Security Assurance).
The insurance does not guarantee the market value
of the municipal bonds.

                                       15
<PAGE>


STATEMENT OF OPERATIONS
This Statement  shows interest  earned by the fund during the reporting  period,
and details the operating  expenses charged to the fund. These expenses directly
reduce the amount of  investment  income  available  to pay to  shareholders  as
tax-exempt  income  dividends.  This  Statement  also shows any Net Gain  (Loss)
realized  on the  sale of  investments,  and the  increase  or  decrease  in the
Unrealized  Appreciation  (Depreciation) on investments  during the period. If a
fund  invested  in futures  contracts  during the  period,  the results of these
investments are shown separately.

- --------------------------------------------------------------------------------
                                       FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND
                                                    YEAR ENDED NOVEMBER 30, 1999
                                                                           (000)
- --------------------------------------------------------------------------------
INVESTMENT INCOME
INCOME
   Interest                                                             $ 44,794
                                                                        --------
      Total Income                                                        44,794
                                                                        --------
EXPENSES
   The Vanguard Group--Note B
      Investment Advisory Services                                           111
      Management and Administrative                                        1,271
      Marketing and Distribution                                             159
   Custodian Fees                                                              9
   Auditing Fees                                                               8
   Shareholders' Reports                                                       9
   Trustees' Fees and Expenses                                                 1
                                                                        --------
      Total Expenses                                                       1,568
      Expenses Paid Indirectly--Note C                                       (9)
                                                                        --------
      Net Expenses                                                         1,559
- --------------------------------------------------------------------------------
NET INVESTMENT INCOME                                                     43,235
- --------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)
   Investment Securities Sold                                            (1,604)
   Futures Contracts                                                       3,424
- --------------------------------------------------------------------------------
REALIZED NET GAIN                                                          1,820
- --------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)
   Investment Securities                                                (63,175)
   Futures Contracts                                                         648
- --------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)                        (62,527)
- --------------------------------------------------------------------------------
NET DECREASE IN NET ASSETS RESULTING FROM OPERATIONS                   $(17,472)
================================================================================

                                       16

<PAGE>


STATEMENT OF CHANGES IN NET ASSETS
This Statement shows how the fund's total net assets changed during the two most
recent reporting periods. The Operations section summarizes information detailed
in the  Statement  of  Operations.  Because the fund  distributes  its income to
shareholders  each day,  the  amounts of  Distributions--Net  Investment  Income
generally equal the net income earned as shown under the Operations section. The
amounts of Distributions--Realized  Capital Gain may not match the capital gains
shown in the Operations section,  because  distributions are determined on a tax
basis and may be made in a period different from the one in which the gains were
realized on the financial  statements.  The Capital Share  Transactions  section
shows the amount shareholders  invested in the fund, either by purchasing shares
or by reinvesting  distributions,  and the amounts  redeemed.  The corresponding
numbers of Shares Issued and Redeemed are shown at the end of the Statement.

<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------
                                                                                FLORIDA INSURED LONG-TERM
                                                                                      TAX-EXEMPT FUND
                                                                                YEAR ENDED NOVEMBER 30,
                                                                                --------------------------
<S>                                                                                <C>             <C>
                                                                                    1999              1998
                                                                                   (000)             (000)
- ----------------------------------------------------------------------------------------------------------
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
   Net Investment Income                                                       $  43,235         $  34,425
   Realized Net Gain                                                               1,820             8,021
   Change in Unrealized Appreciation (Depreciation)                              (62,527)           11,900
                                                                                --------------------------
      Net Increase (Decrease) in Net Assets Resulting from Operations            (17,472)           54,346
DISTRIBUTIONS
   Net Investment Income                                                         (43,235)          (34,425)
   Realized Capital Gain                                                          (6,916)               --
                                                                                --------------------------
      Total Distributions                                                        (50,151)          (34,425)
                                                                                --------------------------
CAPITAL SHARE TRANSACTIONS1
   Issued                                                                        362,954           351,784
   Issued in Lieu of Cash Distributions                                           33,301            22,335
   Redeemed                                                                     (271,538)         (193,595)
                                                                                --------------------------
      Net Increase from Capital Share Transactions                               124,717           180,524
- ----------------------------------------------------------------------------------------------------------
   Total Increase                                                                 57,094           200,445
- ----------------------------------------------------------------------------------------------------------
NET ASSETS
   Beginning of Year                                                             817,516           617,071
                                                                                --------------------------
   End of Year                                                                  $874,610          $817,516
==========================================================================================================
1Shares Issued (Redeemed)
   Issued                                                                         32,294            30,858
   Issued in Lieu of Cash Distributions                                            2,985             1,958
   Redeemed                                                                      (24,377)          (17,015)
                                                                                --------------------------
         Net Increase in Shares Outstanding                                       10,902            15,801
==========================================================================================================
</TABLE>

                                       17

<PAGE>

FINANCIAL HIGHLIGHTS
This table  summarizes  the  fund's  investment  results  and  distributions  to
shareholders on a per-share  basis. It also presents the fund's Total Return and
shows net  investment  income and expenses as percentages of average net assets.
These data will help you assess:  the  variability  of the fund's net income and
total returns from year to year;  the relative  contributions  of net income and
capital gains to the fund's total return; how much it costs to operate the fund;
and the extent to which the fund tends to distribute  capital  gains.  The table
also  shows the  Portfolio  Turnover  Rate,  a measure of  trading  activity.  A
turnover  rate of 100% means that the  average  security is held in the fund for
one year.

<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------------------
                                                                        FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND
                                                                                  YEAR ENDED NOVEMBER 30,
- -------------------------------------------------------------------------------------------------------------------
<S>                                                                   <C>      <C>       <C>      <C>          <C>
FOR A SHARE OUTSTANDING THROUGHOUT EACH YEAR                          1999     1998      1997     1996         1995
- -------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING OF YEAR                                  $11.54   $11.21    $11.07   $10.94      $  9.61
- -------------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
   Net Investment Income                                              .543     .551      .561     .550         .560
   Net Realized and Unrealized Gain (Loss) on Investments            (.749)    .330      .140     .130        1.330
- -------------------------------------------------------------------------------------------------------------------
      Total from Investment Operations                               (.206)    .881      .701     .680        1.890
DISTRIBUTIONS
   Dividends from Net Investment Income                              (.543)   (.551)    (.561)   (.550)       (.560)
   Distributions from Realized Capital Gains                         (.091)   --         --        --            --
- -------------------------------------------------------------------------------------------------------------------
      Total Distributions                                            (.634)   (.551)    (.561)   (.550)       (.560)
===================================================================================================================
NET ASSET VALUE, END OF YEAR                                        $10.70   $11.54    $11.21   $11.07       $10.94
===================================================================================================================
TOTAL RETURN                                                         -1.87%    8.03%     6.54%    6.45%       20.05%
===================================================================================================================

RATIOS/SUPPLEMENTAL DATA
   Net Assets, End of Year (Millions)                                 $875     $818      $617     $515         $423
   Ratio of Total Expenses to Average Net Assets                      0.18%    0.20%     0.19%    0.19%        0.21%
   Ratio of Net Investment Income to Average Net Assets               4.88%    4.83%     5.10%    5.09%        5.33%
   Portfolio Turnover Rate                                             18%       21%       13%      19%          20%
===================================================================================================================
</TABLE>
                                       18
<PAGE>

NOTES TO FINANCIAL STATEMENTS
Vanguard  Florida  Insured  Long-Term  Tax-Exempt  Fund is registered  under the
Investment  Company Act of 1940 as an  open-end  investment  company,  or mutual
fund. The fund invests in debt instruments of municipal issuers whose ability to
meet their obligations may be affected by economic and political developments in
the state of Florida.

A. The following  significant  accounting policies conform to generally accepted
accounting  principles  for mutual  funds.  The fund  consistently  follows such
policies in preparing its financial statements.
     1. Security Valuation:  Bonds, and temporary cash investments acquired over
60 days to maturity,  are valued using the latest bid prices or using valuations
based on a matrix  system  (which  considers  such  factors as security  prices,
yields,  maturities,  and  ratings),  both as furnished by  independent  pricing
services.  Other temporary cash  investments are valued at amortized cost, which
approximates  market  value.  Securities  for which  market  quotations  are not
readily  available  are valued by  methods  deemed by the Board of  Trustees  to
represent fair value.
     2.  Federal  Income  Taxes:  The fund  intends to  continue to qualify as a
regulated investment company and distribute all of its income.  Accordingly,  no
provision for federal income taxes is required in the financial statements.
     3. Futures Contracts:  The fund may use Municipal Bond Index, U.S. Treasury
Bond, and U.S. Treasury Note futures contracts, with the objectives of enhancing
returns, managing interest rate risk, maintaining liquidity, diversifying credit
risk, and minimizing  transaction  costs.  The fund may purchase or sell futures
contracts  instead of bonds to take advantage of pricing  differentials  between
the futures  contracts and the underlying  bonds. The fund may also seek to take
advantage  of price  differences  among bond  market  sectors by  simultaneously
buying futures (or bonds) of one market sector and selling futures (or bonds) of
another sector.  Futures contracts may also be used to simulate a fully invested
position in the underlying bonds while maintaining a cash balance for liquidity.
The primary  risks  associated  with the use of futures  contracts are imperfect
correlation  between  changes in market values of bonds held by the fund and the
prices of futures contracts, and the possibility of an illiquid market.
     Futures  contracts  are valued  based upon their  quoted  daily  settlement
prices. The aggregate principal amounts of the contracts are not recorded in the
financial statements. Fluctuations in the value of the contracts are recorded in
the  Statement  of Net Assets as an asset  (liability)  and in the  Statement of
Operations as  unrealized  appreciation  (depreciation)  until the contracts are
closed, when they are recorded as realized futures gains (losses).
     4.  Distributions:  Distributions  from net investment  income are declared
daily  and  paid  on the  first  business  day of the  following  month.  Annual
distributions  from  realized  capital  gains,  if  any,  are  recorded  on  the
ex-dividend date.
     5. Other:  Security  transactions  are accounted for on the date securities
are bought or sold. Costs used to determine  realized gains (losses) on the sale
of investment securities are those of the specific securities sold. Premiums and
original issue discounts are amortized and accreted,  respectively,  to interest
income over the lives of the respective securities.

B.  The  Vanguard  Group  furnishes  at  cost  investment  advisory,   corporate
management,  administrative,  marketing, and distribution services. The costs of
such services are  allocated to the fund under methods  approved by the board of
Trustees.  The fund has  committed  to  provide up to 0.40% of its net assets in
capital   contributions  to  Vanguard.  At  November  30,  1999,  the  fund  had
contributed  capital  of  $178,000  to  Vanguard  (included  in  Other  Assets),
representing   0.02%  of  the  fund's   net   assets  and  0.2%  of   Vanguard's
capitalization. The fund's Trustees and officers are also Directors and officers
of Vanguard.

C. The  fund's  custodian  bank has  agreed  to  reduce  its fees  when the fund
maintains cash on deposit in the  non-interest-bearing  custody account. For the
year ended November 30, 1999, custodian fee offset arrangements reduced expenses
by $9,000.

                                       19
<PAGE>

NOTES TO FINANCIAL STATEMENTS (CONTINUED)

D. During the year ended November 30, 1999, the fund purchased  $262,744,000  of
investment securities and sold $154,187,000 of investment securities, other than
temporary cash investments.

E. Capital gain  distributions are determined on a tax basis and may differ from
realized  capital gains for financial  reporting  purposes due to differences in
the  timing of  realization  of gains.  The fund had  realized  losses  totaling
$2,620,000  through  November 30, 1999,  which are deferred for tax purposes and
increase the amount of net unrealized  depreciation on investment securities for
tax purposes (see Note F). At November 30, 1999, the fund had available  capital
losses of $173,000 to offset future net capital gains through November 30, 2007.

F. At November 30, 1999, net unrealized  depreciation  of investment  securities
for federal income tax purposes was $17,211,000,  consisting of unrealized gains
of  $9,971,000 on  securities  that had risen in value since their  purchase and
$27,182,000  in unrealized  losses on securities  that had fallen in value since
their purchase. (See Note E).

                                       20

<PAGE>


REPORT OF INDEPENDENT ACCOUNTANTS

To the Shareholders and Trustees of
Vanguard Florida Insured Long-Term Tax-Exempt Fund

In our  opinion,  the  accompanying  statement  of net  assets  and the  related
statements  of  operations  and of  changes  in net  assets  and  the  financial
highlights present fairly, in all material  respects,  the financial position of
Vanguard Florida Insured Long-Term  Tax-Exempt Fund (the "Fund") at November 30,
1999, the results of its operations for the year then ended,  the changes in its
net assets for each of the two years in the period then ended and the  financial
highlights  for each of the five years in the period then ended,  in  conformity
with generally accepted accounting  principles.  These financial  statements and
financial highlights  (hereafter referred to as "financial  statements") are the
responsibility  of the Fund's  management;  our  responsibility is to express an
opinion on these  financial  statements  based on our audits.  We conducted  our
audits of these  financial  statements in  accordance  with  generally  accepted
auditing  standards  which  require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits,  which  included  confirmation  of  securities  at November  30, 1999 by
correspondence  with the custodian,  provide a reasonable  basis for the opinion
expressed above.

PricewaterhouseCoopers LLP

Thirty South Seventeenth Street
Philadelphia, Pennsylvania 19103

January 6, 2000


                                       21

<PAGE>


================================================================================
SPECIAL 1999 TAX INFORMATION (UNAUDITED) FOR
VANGUARD FLORIDA INSURED LONG-TERM TAX-EXEMPT FUND
This  information  for the fiscal  year ended  November  30,  1999,  is included
pursuant to provisions of the Internal Revenue Code.
     The fund  distributed  $6,906,000  as  capital  gain  dividends  (from  net
long-term  capital  gains) to  shareholders  in December  1998,  all of which is
designated as a 20% rate gain distribution.
     The  fund  designates  100%  of its  income  dividends  as  exempt-interest
dividends.
================================================================================

                                       22
<PAGE>


THE VANGUARD FAMILY OF FUNDS
STOCK FUNDS
- --------------------------------------------------
500 Index Fund
Aggressive Growth Fund
Capital Opportunity Fund
Convertible Securities Fund
Emerging  Markets Stock Index Fund
Energy Fund Equity Income Fund
European Stock Index Fund
Explorer Fund
Extended Market Index Fund*
Global Equity Fund
Gold and Precious  Metals Fund
Growth and Income Fund
Growth Index Fund*
Health Care Fund
Institutional  Index Fund*
International  Growth Fund
International  Value Fund
Mid-Cap  Index Fund*
Morgan  Growth Fund
Pacific  Stock Index Fund
PRIMECAP Fund
REIT Index Fund
Selected Value Fund
Small-Cap Growth Index Fund*
Small-Cap Index Fund*
Small-Cap  Value  Index  Fund*
Tax-Managed  Capital  Appreciation  Fund*
Tax-Managed Growth and Income Fund*
Tax-Managed  International Fund*
Tax-Managed Small-Cap  Fund*
Total  International  Stock Index Fund
Total Stock Market Index Fund*
U.S.  Growth Fund
Utilities  Income Fund
Value Index Fund*
Windsor  Fund
Windsor II Fund

BALANCED FUNDS
- --------------------------------------------------
Asset Allocation Fund
Balanced Index Fund
Global Asset Allocation Fund
LifeStrategy Conservative Growth Fund
LifeStrategy Growth Fund
LifeStrategy Income Fund
LifeStrategy Moderate Growth Fund
STAR Fund
Tax-Managed Balanced Fund
Wellesley Income Fund
Wellington Fund

BOND FUNDS
- --------------------------------------------------
Admiral Intermediate-Term
Treasury Fund A
dmiral Long-Term Treasury Fund
Admiral Short-Term  Treasury  Fund
GNMA  Fund
High-Yield   Corporate  Fund
High-Yield Tax-Exempt Fund
Insured Long-Term Tax-Exempt Fund
Intermediate-Term  Bond Index Fund
Intermediate-Term   Corporate  Fund
Intermediate-Term   Tax-Exempt  Fund
Intermediate-Term  Treasury Fund
Limited-Term  Tax-Exempt  Fund
Long-Term Bond Index Fund
Long-Term Corporate Fund
Long-Term Tax-Exempt Fund
Long-Term Treasury Fund
Preferred Stock Fund
Short-Term Bond Index Fund
Short-Term  Corporate Fund*
Short-Term  Federal Fund
Short-Term  Tax-Exempt  Fund
Short-Term  Treasury Fund
State Tax-Exempt Bond Funds
(California, Florida, Massachusetts, New Jersey,
New York, Ohio, Pennsylvania)
Total Bond Market Index Fund*

MONEY MARKET FUNDS
- --------------------------------------------------
Admiral Treasury Money Market Fund
Federal Money Market Fund
Prime Money Market Fund*
State Tax-Exempt Money Market Funds
(California, New Jersey,
New York, Ohio, Pennsylvania)
Tax-Exempt Money Market Fund
Treasury Money Market Fund

VARIABLE ANNUITY PLAN
- --------------------------------------------------
Balanced  Portfolio
Diversified  Value Portfolio
Equity Income Portfolio
Equity Index  Portfolio
Growth  Portfolio
High-Grade  Bond  Portfolio
High Yield Bond Portfolio
International Portfolio
Mid-Cap Index Portfolio
Money Market Portfolio
REIT  Index  Portfolio
Short-Term  Corporate  Portfolio
Small  Company  Growth Portfolio

*Offers Institutional Shares.

For information  about Vanguard funds and our variable  annuity plan,  including
charges and  expenses,  obtain a prospectus  from The Vanguard  Group,  P.O. Box
2600,  Valley Forge, PA 19482-2600.  Read it carefully before you invest or send
money.

                                       23
<PAGE>

THE PEOPLE WHO GOVERN YOUR FUND
The  Trustees of your mutual fund are there to see that the fund is operated and
managed in your best interests  since,  as a shareholder,  you are part owner of
the fund.  Your  fund  Trustees  also  serve on the  Board of  Directors  of The
Vanguard  Group,  which is owned by the  funds  and  exists  solely  to  provide
services to them on an at-cost basis.
     The majority of Vanguard's board members are independent, meaning that they
have no  affiliation  with  Vanguard or the funds they  oversee,  apart from the
sizable personal investments they have made as private  individuals.  They bring
distinguished  backgrounds  in business,  academia,  and public service to their
task of working with Vanguard officers to establish the policies and oversee the
activities of the funds.
     Among board members' responsibilities are selecting investment advisers for
the  funds;  monitoring  fund  operations,  performance,  and  costs;  reviewing
contracts;  nominating  and  selecting  new  Trustees/Directors;   and  electing
Vanguard officers.
     The list below provides a brief description of each Trustee's  professional
affiliations.  Noted in  parentheses is the year in which the Trustee joined the
Vanguard Board.

TRUSTEES
JOHN C. BOGLE (1967) Founder, Senior Chairman of the Board, and Director/Trustee
of The  Vanguard  Group,  Inc.,  and  each of the  investment  companies  in The
Vanguard Group.

JOHN J. BRENNAN  (1987)  Chairman of the Board,  Chief  Executive  Officer,  and
Director/Trustee  of The  Vanguard  Group,  Inc.,  and  each  of the  investment
companies in The Vanguard Group.

JOANN HEFFERNAN HEISEN (1998) Vice President,  Chief Information  Officer, and a
member of the  Executive  Committee of Johnson & Johnson;  Director of Johnson &
JohnsonoMerck Consumer Pharmaceuticals Co., The Medical Center at Princeton, and
Women's Research and Education Institute.

BURTON G. MALKIEL  (1977)  Chemical  Bank  Chairman's  Professor  of  Economics,
Princeton  University;  Director of Prudential  Insurance Co. of America,  Banco
Bilbao Gestinova,  Baker Fentress & Co., The Jeffrey Co., and Select Sector SPDR
Trust.

ALFRED M. RANKIN, Jr. (1993) Chairman,  President,  Chief Executive Officer, and
Director of NACCO Industries, Inc.; Director of The BFGoodrich Co.

JOHN C. SAWHILL  (1991)  President  and Chief  Executive  Officer of The Nature
Conservancy;  formerly,  Director  and  Senior  Partner  of  McKinsey  & Co. and
President  of New York  University;  Director of Pacific Gas and  Electric  Co.,
Procter & Gamble Co., NACCO Industries, and Newfield Exploration Co.

JAMES O. WELCH,  Jr. (1971) Retired  Chairman of Nabisco Brands,  Inc.;  retired
Vice Chairman and Director of RJR Nabisco;  Director of TECO Energy,  Inc.,  and
Kmart Corp.

J.  LAWRENCE  WILSON  (1985)  Retired  Chairman of Rohm & Haas Co.;  Director of
Cummins Engine Co. and The Mead Corp.; Trustee of Vanderbilt University.

OTHER FUND OFFICERS
RAYMOND J. KLAPINSKY  Secretary; Managing
Director and Secretary of The Vanguard Group,
Inc.; Secretary of each of the investment companies
in The Vanguard Group.

THOMAS J. HIGGINS Treasurer; Principal of The
Vanguard Group, Inc.; Treasurer of each of the
investment companies in The Vanguard Group.

VANGUARD MANAGING DIRECTORS
R. GREGORY BARTON  Legal Department.
ROBERT A. DISTEFANO  Information Technology.
JAMES H. GATELY Individual Investor Group.
KATHLEEN C. GUBANICH  Human Resources.
IAN A. MACKINNON  Fixed Income Group.
F. WILLIAM MCNABB, III  Institutional Investor Group.
MICHAEL S. MILLER  Planning and Development.
RALPH K. PACKARD  Chief Financial Officer.
GEORGE U. SAUTER  Core Management Group.
<PAGE>


ABOUT OUR COVER
Our cover art,  depicting HMS Vanguard at sea, is a
reproduction  of Leading the Way, a 1984 work created
and  copyrighted by noted naval artist Tom Freeman,
of Forest Hill, Maryland.

All comparative mutual fund data are from Lipper Inc. or Morningstar,
Inc., unless otherwise noted.

"Standard & Poor's(R),"  "S&P(R),"  "S&P  500(R),"  "Standard & Poor's 500,"
and "500" are trademarks of The McGraw-Hill Companies, Inc.

Frank Russell Company is the owner of trademarks and copyrights
relating to the Russell Indexes.  "Wilshire 4500" and "Wilshire 5000"
are trademarks of Wilshire Associates.

[SHIP]
[THE VANGUARD GROUP LOG]
Post Office Box 2600
Valley Forge, Pennsylvania 19482-2600


WORLD WIDE WEB
www.vanguard.com

FUND INFORMATION
1-800-662-7447

INDIVIDUAL ACCOUNT SERVICES
1-800-662-2739

INSTITUTIONAL INVESTOR SERVICES
1-800-523-1036

This report is intended for the funds'
shareholders.  It may not be distributed
to  prospective  investors  unless it
is preceded or  accompanied by the
current fund prospectus.


Q180-01/25/2000
(C) 2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing Corporation, Distributor.



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