VANGUARD OHIO TAX FREE FUND
N-30D, 2000-07-27
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VANGUARD(R) OHIO
TAX-EXEMPT FUNDS


MAY 31, 2000
SEMIANNUAL

VANGUARD OHIO TAX-EXEMPT
MONEY MARKET FUND

VANGUARD OHIO
INSURED LONG-TERM
TAX-EXEMPT FUND


[A MEMBER OF
THE VANGUARD GROUP LOGO]

<PAGE>





HAVE THE PRINCIPLES OF INVESTING CHANGED?
In a world  of  frenetic  change  in  business,  technology,  and the  financial
markets,  it is natural to wonder whether the basic principles of investing have
changed.
     We don't think so.
     The most  successful  investors  over the coming  decade  will be those who
began the new century with a fundamental  understanding  of risk and who had the
discipline to stick with long-term investment programs.
     Certainly,  investors  today  confront a challenging,  even  unprecedented,
environment.  Valuations of market  indexes are at or near historic  highs.  The
strength and duration of the bull market in U.S.  stocks have inflated  people's
expectations  and  diminished  their  recognition  of the market's  considerable
risks. And the incredible  divergence in stock returns--many  technology-related
stocks  gained  100% or more in 1999,  yet prices fell for more than half of all
stocks--has made some investors question the idea of diversification.
     And then there is the  Internet.  Undeniably,  it is a powerful  medium for
communications and transacting business.  For investors,  the Internet is a vast
source  of  information  about  investments,  and  online  trading  has  made it
inexpensive and convenient to trade stocks and invest in mutual funds.
     However,  new tools do not guarantee good  workmanship.  Information is not
the same as wisdom.  Indeed,  much of the information,  opinion,  and rumor that
swirl  about  financial  markets  each day  amounts  to  "noise"  of no  lasting
significance.  And the fact  that  rapid-fire  trading  is easy does not make it
beneficial.   Frequent  trading  is  almost  always  counterpro-ductive  because
costs--even at low commission rates--and taxes detract from the returns that the
markets  provide.  Sadly,  many  investors jump into a "hot" mutual fund just in
time to see it  cool  off.  Meanwhile,  long-term  fund  investors  are  hurt by
speculative  trading  activity  because they bear part of the costs  involved in
accommodating purchases and redemptions.
     Vanguard  believes that  intelligent  investors  should  resist  short-term
thinking and focus instead on a few time-tested principles:
o    Invest for the long term. Pursuing your long-term  investment goals is more
     like a marathon than a sprint.
o    Diversify  your  investments  with  holdings  in  stocks,  bonds,  and cash
     investments.  Remember  that,  at any  moment,  some part of a  diversified
     portfolio  will lag  other  parts,  and be wary of  taking  on more risk by
     "piling onto" the  best-performing  part of your  holdings.  Today's leader
     could well be tomorrow's laggard.
o    Step back from the daily frenzy of the markets; focus on your overall asset
     allocation.
o    Capture as much of the market's return as possible by minimizing  costs and
     taxes.  Costs and taxes diminish  long-term  returns while doing nothing to
     reduce the risks you incur as an investor.

--------------------------------------------------------------------------------
CONTENTS

REPORT FROM THE CHAIRMAN......1         PERFORMANCE SUMMARIES......11

THE MARKETS IN PERSPECTIVE....4         FUND PROFILES...............8

REPORT FROM THE ADVISER.......6         FINANCIAL STATEMENTS.......12
--------------------------------------------------------------------------------

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  5000(R)" and "Wilshire  4500" are  trademarks of Wilshire  Associates
Incorporated.
<PAGE>


REPORT FROM THE CHAIRMAN                             [PHOTO OF JOHN J. BRENNAN]


     Interest rates for most  municipal  bonds  ratcheted  higher during the six
months ended May 31,  2000--the  first half of Vanguard Ohio  Tax-Exempt  Funds'
fiscal year--and bond prices generally declined. In this environment,  municipal
bonds earned positive total returns, as price declines only partially offset the
interest income earned during the period.
         For the half-year, our Insured Long-Term Tax-Exempt Fund earned a total
return (capital  change plus  reinvested  dividends) of 1.2%, and our Tax-Exempt
Money Market Fund earned 1.9%. As you can see in the adjacent table, the returns
of both funds topped those of their average peers.


---------------------------------------------------------
                                         TOTAL RETURNS
                                        SIX MONTHS ENDED
                                          MAY 31, 2000
---------------------------------------------------------
VANGUARD OHIO TAX-EXEMPT
    MONEY MARKET FUND                         1.9%
    (SEC 7-Day Annualized Yield: 4.03%)

Average Ohio Tax-Exempt
         Money Market Fund*                   1.7
---------------------------------------------------------
VANGUARD OHIO INSURED LONG-TERM
    TAX-EXEMPT FUND                           1.2%

Average Ohio  Municipal Debt Fund*            0.4
---------------------------------------------------------
*Derived from data provided by Lipper Inc.

     The total  return of the Insured  Long-Term  Tax-Exempt  Fund is based on a
decrease  in net asset  value from $11.17 per share on  November  30,  1999,  to
$11.01 per share on May 31, 2000, and is adjusted for dividends  totaling $0.297
per share paid from net investment  income.  The Tax-Exempt  Money Market Fund's
net asset value remained at $1.00 per share, as was expected but not guaranteed.
     For Ohio  residents,  income earned by our funds is exempt from federal and
Ohio  income  taxes,  but may be subject to local  taxes and to the  alternative
minimum tax. On May 31, the Insured  Long-Term  Fund's yield stood at 5.52%,  up
from 5.12% at the end of November 1999; the Money Market Fund's yield was 4.03%,
up from 3.54% six months  earlier.  For taxpayers in the highest  federal income
tax bracket (39.6%), the taxable equivalent yields at the end of the period were
about 9.1% for the Insured  Long-Term  Fund and about 6.7% for the Money  Market
Fund.

THE PERIOD IN REVIEW
The U.S. economy expanded  impressively  during the six months ended May 31, but
the terrific  pace of economic  growth  stoked  fears of higher  inflation--and,
thus,  higher  interest  rates.  These fears put  pressure on the prices of both
stocks and bonds,  making it a volatile six months for stocks,  particularly for
technology shares, and a generally lackluster half-year for bonds.
     The Federal  Reserve Board  continued its campaign to head off inflation by
hiking its target  for  short-term  interest  rates by a full  percentage  point
during the  half-year.  The yield of the 10-year  U.S.  Treasury  note rose only
slightly,  to 6.27% on May 31 from  6.19% six months  earlier,  and the yield of
3-month Treasury bills rose by 32 basis points (0.32 percentage  point) to close
the period at 5.62%.  However,  the yield of the benchmark 30-year U.S. Treasury
bond fell from  6.29% on  November  30,  1999,  to 6.01% on May 31,  2000.  This
decline  resulted  from the  decreasing  supply of  long-term  Treasury  debt--a
development  that drove  prices  higher and  yields  lower for the  longest-term
Treasuries.

                                       1
<PAGE>

     Yields of  high-grade,  long-term  municipal  bonds ended the  half-year at
5.91%,  up a tiny bit from  5.87%  when the period  began.  Yields on  top-grade
(MIG-1) 3-month notes rose 35 basis points to 4.15% on May 31.
     Relative to U.S. Treasury bonds,  longer-term municipal bonds are extremely
attractive, particularly for investors in higher income tax brackets. On May 31,
the yield of a high-grade,  long-term  municipal  bond was equal to about 98% of
the yield of the  30-year  U.S.  Treasury  bond,  whose  interest  is subject to
federal  income tax. The spread between  long-term  Treasury bonds and munis was
unusually  thin  because  of  the  heavy  demand  for--and  thus,  lower  yields
of--long-term Treasuries.  For securities with maturities of 10 years, the yield
of  municipal  bonds  was  equal to about  85% of the  yield  of  Treasuries,  a
proportion in line with the long-term historical rate.
     The U.S. stock market advanced during the six months,  though as the period
progressed  investors' favor shifted toward  value-oriented stocks and away from
growth  shares.  The Wilshire 5000 Total Market  Index,  a measure of the entire
U.S.  stock market,  gained 2.4% for the half-year.  Among  large-capitalization
stocks, the returns of value stocks outpaced those of growth-oriented  shares by
nearly 2  percentage  points  (3.6% for the  Standard & Poor's  500/BARRA  Value
Index;  1.9% for the S&P  500/BARRA  Growth  Index).  The split  was  especially
evident from March  through May,  when large value stocks gained 10.0% and large
growth stocks slipped -0.4%.

PERFORMANCE OVERVIEW
Vanguard Ohio Tax-Exempt Money Market Fund earned 1.9% for the six months,  just
ahead of the 1.7%  return of our  average  peer.  Our  margin  over our  average
competitor  can be  attributed  to our  much  lower  expenses,  which  give us a
significant  and  sustainable  advantage  over  funds  that  invest  in  similar
securities.
     The 1.2% total  return  earned by the  Insured  Long-Term  Tax-Exempt  Fund
during the  half-year  exceeded both the 0.4% return of our average peer and the
1.0% return of the Lehman  Brothers  Municipal Bond Index,  which exists outside
the real world of operating expenses and transaction costs.
     Of course, a six-month return tells only part of the story of a bond fund's
performance.  It's  important  to note that  semiannual  returns  for bond funds
account for only half of the year's interest  income,  while price changes fully
and immediately reflect movements in interest  rates--rising when rates fall and
falling  when rates rise.  For  perspective,  it's  important to consider a full
year's interest  income when evaluating a bond fund.  During the 12 months ended
May 31, 2000, our Insured  Long-Term  Tax-Exempt  Fund recorded a negative total
return of -1.3%,  consisting  of an income return of 5.0% and a price decline of
-6.3%.
     Also, keep in mind that rising  interest rates,  which cause bond prices to
fall, are not entirely bad news for fixed income investors.  Money market yields
and returns quickly adjust higher.  And for long-term  bonds, a rise in interest
rates  causes an  immediate  price  decline,  but the  long-term  effect  can be
beneficial   because  there  is  more  income  to  reinvest  at  higher  yields.
Conversely, when interest rates drop, bond prices rise immediately, but over the
long haul, lower rates diminish the income earned on reinvested dividends.
     Though bond prices can swing dramatically, over the long run it is interest
income that accounts for  virtually all of a bond fund's total return.  As such,
municipal  bonds  that  now  offer a yield of about  5.5%  can  provide  a solid
long-term return, particularly if inflation remains at relatively low levels.

                                       2

<PAGE>

     A key  ingredient in our success is our  significant  cost  advantage  over
similar  funds.  Our  funds  have  annualized  expense  ratios  (expenses  as  a
percentage  of average net assets) of less than 0.20%,  compared  with the 1.10%
charged by the average  long-term Ohio  tax-exempt fund and the 0.60% charged by
the average  Ohio  tax-exempt  money  market  fund.  For our  shareholders,  the
benefits of low costs are twofold.  Our cost  advantage  provides us with a head
start in our quest to  outperform  our  competitors.  Lower costs also allow our
investment  adviser,  Vanguard  Fixed Income Group,  to select bonds with higher
credit  quality  than those  chosen by our  peers,  without a  sacrifice  in net
yields.
     For Vanguard Ohio Insured  Long-Term  Tax-Exempt  Fund, our adviser invests
primarily  in bonds that carry  private  insurance  guaranteeing  the payment of
principal  and  interest  in the event that a bond  issuer  defaults on its debt
obligations.  Though these  securities  offer  slightly  lower gross yields than
noninsured  bonds,  our  low  costs  historically  have  more  than  made up the
difference,  allowing our fund to provide net returns that are fully competitive
with those of lower-quality municipal bond portfolios.

IN SUMMARY
The argument for holding  bonds as well as stocks in a balanced  portfolio is an
enduring one that is not based on past returns or projections of future returns.
Fixed income  investments  add to a  portfolio's  diversification,  and interest
income is a valuable and durable component of total return that, when compounded
over long periods,  plays an important  role in  accumulating  wealth.  For Ohio
residents,  the  triple  tax  benefit  of an Ohio  municipal  bond  fund  can be
especially valuable.
     History has taught us that  investors who maintain  balanced  portfolios of
well-diversified  stock funds, bond funds, and money market funds generally find
it easier to maintain  equilibrium in turbulent  times. We urge you to base your
investment plans on your own goals, time horizon,  and risk  tolerance--and then
to stick with those plans over the long haul.

/S/
John J. Brennan
Chairman and Chief Executive Officer                               June 14, 2000


--------------------------------------------------------------------------------
IN MEMORY
--------------------------------------------------------------------------------
It is with  great  sadness  that I  report  the  death  of John C.  Sawhill,  an
independent  trustee of the fund and a member of The Vanguard  Group's  board of
directors  since 1991.  John, an economist who was president and chief executive
officer  of The  Nature  Conservancy,  died on May 18 at age 63. He was a senior
lecturer at the Harvard  Business School and had formerly served as president of
New York  University  and as deputy  secretary of the U.S.  Department of Energy
under President Jimmy Carter.  John was a remarkable man who was full of energy,
vigor,  and life. His experience and wisdom added a great deal to Vanguard,  and
his death is a blow to everyone  who knew and loved him.  Though  John's work on
behalf of our funds was often  carried on behind the scenes,  he was a dedicated
advocate for the best interests of our shareholders. He will be missed.

                                       3

<PAGE>

THE MARKETS IN PERSPECTIVE
SIX MONTHS ENDED MAY 31, 2000

Strong  crosscurrents  pushed and  tugged at  financial  markets  during the six
months ended May 31, 2000.  Positive  influences  included very strong  economic
growth and rising corporate profits.  Negative factors included tighter monetary
policy, higher inflation, and concerns about stock valuations.
     Interest  rates rose in most  segments of the bond market,  and bond prices
slipped. Stock prices rose slightly, on balance,  although wide day-to-day price
swings were frequent.
     Uncertainty  in both the bond and stock markets  centered on the surprising
performance of the U.S.  economy,  which grew at a torrid 7.3% pace in the final
three  months of 1999 and at a  still-robust  5.4%  during the first  quarter of
2000.  With U.S.  unemployment  at around  4.0% of the  workforce,  the  Federal
Reserve Board  continued to be concerned that inflation  would worsen unless the
economic  expansion  slowed.  The Fed raised  short-term  interest rates by 0.25
percentage  point in February and again in March,  before boosting rates by 0.50
percentage    point    in    mid-May.    These    boosts,     following    three
quarter-percentage-point increases in 1999, took the Fed's target for short-term
rates to 6.5%.  By the end of May,  some  signs of  slowing  had  emerged in the
economy,  although it was not certain  that the Fed had  finished  applying  the
brakes.


-------------------------------------------------------------------
                                             TOTAL RETURNS
                                        PERIODS ENDED MAY 31, 2000
                                        6 MONTHS  1 YEAR  5 YEARS*
-------------------------------------------------------------------
STOCKS
   S&P 500 Index                         2.9%     10.5%    23.8%
   Russell 2000 Index                    5.5       9.9     13.5
   Wilshire 5000 Index                   2.4      10.7     22.3
   MSCI EAFE Index                       0.7      17.4     10.4
-------------------------------------------------------------------
BONDS
   Lehman Aggregate Bond Index           1.4%      2.1%     6.0%
   Lehman 10 Year Municipal Bond Index   0.7      -0.2      5.3
   Salomon Smith Barney 3-Month
     U.S. Treasury Bill Index            2.7       5.2      5.2
-------------------------------------------------------------------
OTHER
Consumer Price Index                    1.8%       3.1%     2.4%
-------------------------------------------------------------------
*Annualized.

     Evidence on inflation was  ambiguous.  The Consumer  Price Index  increased
1.8% and 3.1%, respectively, for the six- and twelve-month periods ended May 31,
but  much of the  increase  was due to  higher  energy  and  food  prices.  Core
inflation,  which excludes those  sectors,  was up a less-scary  2.4% during the
twelve months ended May 31.

U.S. STOCK MARKETS
Optimism about long-term prospects for technology, media, and telecommunications
companies  dominated  the equity  markets  through the first three months of the
period.  But  sentiment  shifted  suddenly  in  mid-March,  sending the tech and
telecom  groups  sharply  lower.  The tech-heavy  Nasdaq  Composite  Index,  for
example, registered a 41.1% return from November 30 through February 29, only to
give back most of the gains  over the next  three  months.  End  result:  a 2.4%
return for the six months ended May 31.
     The overall  stock  market,  as measured by the Wilshire  5000 Index,  also
returned 2.4%.  Value stocks,  those  characterized  by  above-average  dividend
yields and below-average  price/earnings and price/book value ratios,  enjoyed a
resurgence beginning in mid-March.

                                       4
<PAGE>

For the full six months,  the value components of both the  large-capitalization
S&P 500 Index and the  small-cap  Russell 2000 Index  outperformed  the indexes'
growth components.
     Within the S&P 500, the  half-year's  best return was the 48% gain recorded
by "other energy" stocks,  including  oil-drilling  and services  companies that
benefited from a continuing  rise in oil prices.  The  producer-durables  sector
gained  18%,  largely  because  of big gains for a number  of  manufacturers  of
telecommunications  gear and  semiconductor  testing and fabrication  equipment.
Technology  stocks,  which now account for about  one-quarter of the total stock
market's value, gained about 12% for the six months.
     Poor performers included the utilities sector (-14% return), which was hurt
by downturns in several large telephone stocks,  and many consumer staples (-9%)
and consumer-discretionary  (-6%) companies. Prices fell steeply for a number of
high-profile  retailers,  beverage  and  food  makers,  tobacco  companies,  and
entertainment enterprises.

U.S. BOND MARKETS
The Federal  Reserve's  influence on interest  rates is strongest for short-term
securities. Over the six months, the Fed pushed up the rate charged on overnight
loans  between  banks by 1  percentage  point to 6.5%.  Yields of  3-month  U.S.
Treasury bills rose only one-third as far (0.32  percentage  point,  or 32 basis
points),  to 5.62%.  And long-term  Treasury yields moved even less. The 10-year
Treasury  note rose just 8 basis  points to 6.27% as of May 31, and yields  fell
for very long-term  Treasury bonds due to a cutback in issuance of new bonds. As
a result of the shrinking  supply of long-term  bonds,  the yield of the 30-year
Treasury  bond  declined  28  basis  points--from  6.29%  to  6.01%--during  the
half-year.
     Because short-term rates moved higher while long-term rates declined, there
was an unusual "inversion" in the yield curve.  Instead of sloping  upward--with
yields  increasing  along with the  maturity of Treasury  securities--the  curve
sloped down. The 6.01% yield of 30-year Treasuries on May 31 was 70 basis points
below the 6.71% yield on 3-year Treasury notes.
     Corporate  and  municipal  bonds  did  not  perform  as  well  as  Treasury
securities,  and the yield curve for these sectors remained  positive--yields of
long-term bonds remained higher than those of short-term securities.  The Lehman
Aggregate  Bond Index,  a proxy for the overall  taxable bond  market,  returned
1.4%, as a price decline of 2% offset most of the 3.4% income  provided by bonds
during the half-year.

INTERNATIONAL STOCK MARKETS
A stronger  U.S.  dollar and weak Asian  markets made the half-year a lackluster
one for U.S.  investors in foreign stocks.  Improving economic growth in most of
the world  helped a number of  markets  in Europe,  Asia,  and Latin  America to
produce good gains in their local currencies. However, the U.S. dollar increased
in value versus most currencies,  significantly reducing the returns received by
dollar-based  investors.  (Conversely,  when the dollar falls in value,  returns
from abroad are enhanced for U.S. investors.)
     The overall  return in dollars from developed  foreign  markets was a scant
0.7%,  as  measured  by  the  Morgan  Stanley  Capital   International   Europe,
Australasia, Far East (EAFE) Index. However, in local currencies, the EAFE Index
return for the six months was a very respectable 7.8%.
     In  Europe,   where  stocks  benefited  from  a  continuance  of  corporate
acquisitions,  an average 12.8% gain in local-currency terms was reduced to 4.7%
for U.S.  investors  because of the  dollar's  strength.  Stocks in the  Pacific
region,  which is  dominated  by Japan,  returned  -7.0% in dollars,  as a -2.0%
return in local-currency terms was further diminished by the dollar's gains. The
Select Emerging Markets Free Index returned -2.8% in U.S. dollars.

                                       5
<PAGE>

REPORT FROM THE ADVISER

The economy  continued  along a path of robust  expansion  during the six months
ended May 31,  2000,  the first half of the fiscal year for  Vanguard  Ohio Tax-
Exempt Funds. The unemployment  rate fell as low as 3.9% and the economy grew at
an annual rate of more than 5% during the half-year.  A fear of inflation roiled
the markets, as investors focused on rising short-term rates. On three occasions
the Federal  Reserve  Board  increased  the federal  funds rate to slow economic
growth. In turn, this led to a noticeable  increase in stock market  volatility.
Throughout the tumult,  the tax-exempt bond market remained  relatively  calm. A
typical long-term,  high-quality  municipal bond started the period with a 5.87%
yield  and  ended it with a barely  changed  yield of  5.91%.  Importantly,  the
transition from 1999 to 2000 went smoothly,  without negative effects for either
the issuers of municipal bonds or the financial markets.
     Although other markets were volatile during the half-year, tax-exempt bonds
were a solid, if unglamorous, investment. During this time, your funds continued
to dutifully  turn out  consistent  tax-exempt  dividends.  Often the  municipal
securities  market  lacks the  dramatic  allure of the  stock  market.  However,
tax-exempt  securities  are a  reliable  workhorse  for the  total  return of an
investor's portfolio.
     The  Tax-Exempt  Money Market Fund earned a tax-free  return of 1.9% during
the half-year, while the Insured Long-Term Tax-Exempt Fund provided a 1.2% total
return. Both funds outpaced their average peer funds.

LOW DEMAND, LOW SUPPLY
During the  half-year,  few new  investors  entered the  municipal  bond market.
Indeed,  most  tax-exempt  funds  experienced net outflows of cash, as investors
redeemed shares to finance other purchases or to pay federal taxes.  During this
time,  the low demand for  municipal  bonds  improved  their  value  relative to
taxable bonds. As of May 31, a highly rated,  long-term state general obligation
bond provided 98% of the income of a similar U.S. Treasury security, even though
interest paid on the municipal bond is generally exempt from federal income tax,
while interest on Treasuries is not. Investors in the top (39.6%) federal income
tax bracket,  therefore,  received 2.3  percentage  points in additional  yield,
after  taxes,  from  high-quality,   long-term  muni  bonds  than  from  similar
Treasuries. Such attractive relative yields have rarely endured.
     The supply of newly issued  tax-exempt bonds so far in 2000 is a staggering
30% lower than last year. The stronger economy has boosted the finances of local
governments,  so fewer issuers need to tap the credit  markets.  The drop in new
municipal bond issuance has supported prices for existing tax-exempt securities,
especially in states with relatively high taxes. However, the effects of reduced
supply have  largely been offset by tepid demand for  municipal  bonds.  At some
point,  we can expect that  municipal bond prices will rise in relation to those
of taxable bonds and that the spread  between  yields of municipals  and taxable
bonds will widen.

--------------------------------------------------------------------------------
INVESTMENT PHILOSOPHY
The adviser  believes that each fund, while operating within stated maturity and
stringent  quality  targets,  can achieve a high level of current income that is
exempt  from  federal  and  Ohio  income  taxes  by  investing  in  insured  and
high-quality  uninsured  securities issued by Ohio state,  county, and municipal
governments.
--------------------------------------------------------------------------------

                                       6
<PAGE>

MATURITY SPREADS NARROW, CREDIT SPREADS WIDEN
For municipal bonds, as for other fixed income investments, the spread in yields
between  issues  with  short- and  long-term  maturities  has  narrowed.  In the
tax-exempt market, the gap in yields between a 1-year bond and a 30-year bond is
only 1.4  percentage  points,  down from  about 2.0  percentage  points.  In the
Treasury bond market,  short-term  bond yields are currently  higher than yields
for long-term bonds. This is unusual, because investors typically require higher
yields to lend  money for longer  periods.  The  anomaly  reflects  the  Federal
Reserve Board's raising of short-term  rates and the fall in supply of long-term
Treasury bonds.  Even if the Fed keeps raising  interest rates, we expect yields
for tax-exempt bonds to maintain their usual  upward-sloping  curve, with yields
rising as maturities increase.
     During the half-year,  the spread between yields of high-quality  municipal
bonds and yields of lower-quality  bonds widened.  This meant that lower-quality
bond prices lagged those of high-quality bonds and that investors were demanding
higher yields to take on higher credit risk. During the period, the extra income
paid by bonds with the lowest  investment-grade  rating  (Baa/BBB)  versus those
with the highest  quality (AAA)  increased from 0.50 to 0.75  percentage  point.
This  reversed  the trend of recent  years,  when  credit  spreads  narrowed  to
historical  lows as investors  stretched  for  incrementally  higher  returns by
buying lower-quality bonds.
     The trend  toward  wider  credit-quality  spreads  began with bonds used to
finance  hospitals and other health care facilities.  Most health care providers
have credit  ratings in the middle or lower tiers of  investment-grade  ratings.
Rising  cost  pressures  and  reductions  in expense  reimbursement  from health
insurers  have taken a toll.  Investors  are cautious and have  demanded  higher
yields to hold bonds from these issuers,  a trend that has spilled over into all
lower-quality  sectors.  As you have come to expect,  Vanguard has  maintained a
steady commitment to  higher-quality  issues. We have sought to provide superior
income by keeping expenses low, so that more of the funds' gross income flows to
you,  rather than by taking on increased  credit risk. The market's recent focus
on credit quality has helped our performance relative to peer funds.

THE TAX-EXEMPT MONEY MARKET FUND
The yield on the 1-year U.S.  Treasury  bill rose 49 basis  points to finish the
period at 6.17%.  This rise was a direct  result of the  earlier-mentioned  rate
hikes by the Fed. Yields on 1-year  tax-exempt money market  instruments rose 72
basis points during the six months.  The benchmark  1-year MIG-1 tax-exempt note
closed the period with a yield of 4.59%.  Short-term municipal securities became
more  attractive  relative to  Treasuries:  The ratio of yields of 1-year  MIG-1
notes to those of 1-year  Treasuries  increased during the six months from 68.1%
to 74.4%.  Contributing  to the rise in yields for  short-term  municipals was a
surge in redemptions  from tax-exempt  money market funds during tax season,  as
shareholders wrote checks to pay their federal tax liabilities.

Ian A. MacKinnon, Managing Director
Christopher M. Ryon, Principal
Pamela Wisehaupt Tynan, Principal
John M. Carbone, Principal
Christopher W. Alwine, Principal
Vanguard Fixed Income Group

June 13, 2000

                                       7
<PAGE>

FUND PROFILE
OHIO TAX-EXEMPT MONEY MARKET FUND

This  Profile  provides a snapshot of the fund's  characteristics  as of May 31,
2000. Key elements of this Profile are defined on page 9.

                                        DISTRIBUTION BY CREDIT QUALITY
FINANCIAL ATTRIBUTES                    (% OF PORTFOLIO)
-----------------------------           ----------------------------------------
Yield                   4.0%            MIG-1/SP-1+                        59.8%
Average Maturity     50 days            A-1/P-1                            28.9
Average Quality        MIG-1            AAA/AA                              9.9
Expense Ratio         0.16%*            A                                   1.4
                                        ----------------------------------------
                                        Total                             100.0%
*Annualized.


                                       8

<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  instruments.  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 (7 days for money  market  funds) 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.


                                       9
<PAGE>

FUND PROFILE
OHIO INSURED LONG-TERM TAX-EXEMPT FUND

This  Profile  provides a snapshot of the fund's  characteristics  as of May 31,
2000,  compared where  appropriate to an unmanaged  index.  Key elements of this
Profile are defined on page 9.

FINANCIAL ATTRIBUTES
------------------------------------------------
                       OHIO INSURED      LEHMAN
                          LONG-TERM      INDEX*
------------------------------------------------
Number of Issues                173      38,998
Yield                          5.5%          --
Yield to Maturity              5.6%          --
Average Coupon                 5.1%        5.5%
Average Maturity         12.5 years  13.4 years
Average Quality                 AAA         AA+
Average Duration          8.2 years   7.5 years
Expense Ratio               0.19%**          --
Cash Reserves                  0.0%          --

*Lehman Municipal Bond Index.
**Annualized.


INVESTMENT FOCUS
------------------------------------------------
Average Maturity        Long
Credit Quality          High


VOLATILITY MEASURES
------------------------------------------------
                        OHIO INSURED     LEHMAN
                           LONG-TERM     INDEX*
------------------------------------------------
R-Squared                       0.98       1.00
Beta                            1.11       1.00

*Lehman Municipal Bond Index.


DISTRIBUTION BY CREDIT QUALITY
(% OF PORTFOLIO)
------------------------------------------------
AAA                     97.6%
AA                       2.4
A                        0.0
BBB                      0.0
BB                       0.0
B                        0.0
------------------------------------------------
Total                  100.0%


DISTRIBUTION BY MATURITY
(% OF PORTFOLIO)
------------------------------------------------
Under 1 Year            5.7%
1-5 Years               9.6
5-10 Years             22.0
10-20 Years            39.0
20-30 Years            23.7
Over 30 Years           0.0
------------------------------------------------
Total                 100.0%

                                       10

<PAGE>

PERFORMANCE SUMMARIES

All of the data on this page represent past performance, which cannot be used to
predict  future  returns  that may be  achieved  by the funds.  Note that annual
returns  can  fluctuate  widely.  An  investment  in a money  market fund is not
insured or guaranteed by the Federal Deposit Insurance  Corporation or any other
government  agency.  Although  the fund  seeks  to  preserve  the  value of your
investment  at $1 per share,  it is possible to lose money by  investing  in the
fund. Note that income returns can fluctuate, as can the share price of the Ohio
Insured  Long-Term  Tax-Exempt  Fund.  An investor's  shares in this fund,  when
redeemed, could be worth more or less than their original cost.

OHIO TAX-EXEMPT MONEY MARKET FUND
TOTAL INVESTMENT RETURNS: JUNE 18, 1990-MAY 31, 2000
----------------------------------------------------
                OHIO TAX-EXEMPT         AVERAGE
               MONEY MARKET FUND         FUND*
FISCAL     CAPITAL  INCOME   TOTAL       TOTAL
YEAR       RETURN   RETURN   RETURN     RETURN
----------------------------------------------------
1990        0.0%     2.6%     2.6%       2.5%
1991        0.0      4.7      4.7        4.5
1992        0.0      3.0      3.0        2.9
1993        0.0      2.4      2.4        2.2
1994        0.0      2.6      2.6        2.4
1995        0.0      3.8      3.8        3.5
1996        0.0      3.4      3.4        3.1
1997        0.0      3.5      3.5        3.2
1998        0.0      3.4      3.4        3.1
1999        0.0      3.0      3.0        2.8
2000**      0.0      1.9      1.9        1.7
----------------------------------------------------
SEC 7-Day Annualized Yield (5/31/2000): 4.03%
----------------------------------------------------
*Average Ohio Tax-Exempt Money Market Fund; derived
from data provided by Lipper Inc.
**Six months ended May 31, 2000.
See Financial  Highlights table on page 20 for
dividend information for the past five years.


OHIO INSURED LONG-TERM TAX-EXEMPT FUND
TOTAL INVESTMENT RETURNS: JUNE 18, 1990-MAY 31, 2000
----------------------------------------------------
            OHIO INSURED LONG-TERM
               TAX-EXEMPT FUND          LEHMAN*
FISCAL     CAPITAL  INCOME   TOTAL       TOTAL
YEAR       RETURN   RETURN   RETURN     RETURN
----------------------------------------------------
1990        3.0%     3.0%     6.0%       4.9%
1991        2.9      6.6      9.5       10.3
1992        4.5      6.2     10.7       10.0
1993        6.3      5.7     12.0       11.1
1994      -11.2      4.9     -6.3       -5.2
1995       13.1      6.4     19.5       18.9
1996        0.3%     5.4%     5.7%       5.9%
1997        0.9      5.4      6.3        7.2
1998        2.6      5.2      7.8        7.8
1999       -6.9      4.8     -2.1       -1.1
2000**     -1.4      2.6      1.2        1.0
----------------------------------------------------
*Lehman Municipal Bond Index.
**Six months ended May 31, 2000.
See  Financial  Highlights  table  on page 21 for
dividend  and  capital  gains information for the
past five years.

<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS: PERIODS ENDED MARCH 31, 2000*
-----------------------------------------------------------------------------------------------
                                                                          SINCE INCEPTION
                                        INCEPTION                     -------------------------
                                           DATE     1 YEAR   5 YEARS  CAPITAL    INCOME   TOTAL
-----------------------------------------------------------------------------------------------
<S>                                     <C>          <C>      <C>      <C>        <C>     <C>
Ohio Tax-Exempt Money Market Fund       6/18/1990    3.26%    3.41%    0.00%      3.42%   3.42%
Ohio Insured Long-Term Tax-Exempt Fund  6/18/1990   -0.18     5.61     1.49       5.67    7.16
-----------------------------------------------------------------------------------------------
*SEC rules require that we provide this average annual total return  information
through the latest calendar quarter.
</TABLE>

                                       11
<PAGE>

FINANCIAL STATEMENTS
MAY 31, 2000 (UNAUDITED)

STATEMENT OF NET ASSETS
This Statement  provides a detailed list of each 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).  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>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
OHIO TAX-EXEMPT MONEY MARKET FUND                             COUPON          DATE         (000)        (000)
-------------------------------------------------------------------------------------------------------------------
MUNICIPAL BONDS (99.9%)
-------------------------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>            <C>        <C>
Ashland County OH GO                                           4.20%    12/14/2000        10,000       10,015
Butler County OH BAN                                           3.85%      8/3/2000         3,000        3,002
Butler County OH BAN                                           4.15%    10/19/2000         4,490        4,497
Butler County OH BAN                                           4.50%    10/19/2000         8,000        8,012
Clermont County OH Hosp. Rev. VRDO (Mercy Health Systems)      4.15%      6/7/2000         1,400        1,400
Cleveland OH Waterworks Rev.                                   5.00%      1/1/2001 (1)     3,800        3,820
Columbus OH Electric System Rev. VRDO                          4.20%      7/3/2000 LOC    14,520       14,520
Columbus OH GO                                                 4.75%     9/15/2000         1,750        1,755
Columbus OH GO                                                 5.50%     6/15/2000         2,000        2,002
Columbus OH GO VRDO                                            4.15%      6/8/2000           900          900
Columbus OH Sewer Rev. VRDO                                    4.25%      6/8/2000         3,100        3,100
Cuyahoga County OH Econ. Dev. Rev. VRDO (Cleveland Orchestra)  4.30%      6/2/2000 LOC     7,100        7,100
Cuyahoga County OH Hosp. Rev. (Meridia Health System)          7.25%     8/15/2000 (Prere.)2,500        2,569
Cuyahoga County OH Hosp. Rev. VRDO(Cleveland Clinic Foundation)4.10%      6/7/2000 LOC     8,700        8,700
Cuyahoga County OH Hosp. Rev. VRDO(Cleveland Clinic Foundation)4.15%      6/7/2000        14,100       14,100
Cuyahoga County OH Hosp. Rev. VRDO (Univ. Health Systems, Inc.)4.35%      6/8/2000 (2)    11,935       11,935
Fairborn OH School Dist. BAN                                   4.45%     9/14/2000         3,300        3,303
Fairfield County OH BAN                                        4.00%     7/25/2000         2,930        2,932
Franklin County OH Hosp. Rev. VRDO (U.S. Health Corp.)         4.32%      6/8/2000 LOC     6,915        6,915
Greene County OH GO                                            3.84%      9/7/2000        10,415       10,418
Hamilton County OH Hosp. Fac. Rev. VRDO (Bethesda Hosp.)       4.20%      6/8/2000 LOC    19,350       19,350
Hamilton County OH Hosp. Fac. Rev. VRDO
(Health Alliance of Greater Cincinnati)                        4.05%      6/7/2000 (1)    14,100       14,100
Lorain County OH Hosp. Fac. Rev. CP
(Catholic Healthcare Partners)                                 4.15%      6/7/2000           400          400
Lorain County OH Hosp. Fac. Rev. VRDO
(Catholic Healthcare Partners)                                 4.30%     9/11/2000        19,600       19,600
Marion OH City School Dist. BAN                                4.78%     8/17/2000         2,513        2,516
Mason OH City School Dist. BAN                                 4.63%     2/15/2001         5,750        5,767
Miamisburg City OH BAN                                         4.25%    12/15/2000         4,500        4,507
Montgomery County OH VRDO (Catholic Health Initiatives)        4.05%      6/7/2000           700          700
Ohio Air Quality Dev. Auth. VRDO
(Cincinnati Gas & Electric Co. Project)                        4.30%      6/2/2000 LOC    27,950       27,950
</TABLE>

                                       12

<PAGE>
<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
                                                              COUPON          DATE         (000)        (000)
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>                 <C>           <C>          <C>
Ohio Air Quality Dev. Auth. VRDO
(Cincinnati Gas & Electric Co. Project)                        4.45%      6/2/2000 LOC    12,565       12,565
Ohio Air Quality Dev. Auth. VRDO (Mead Corp.)                  4.30%      6/2/2000 LOC     1,300        1,300
Ohio Air Quality Dev. Auth. VRDO (Timken Co.)                  4.30%      6/7/2000 LOC     7,000        7,000
Ohio Building Auth. Rev. TOB VRDO                              4.40%      6/1/2000 (1) +   5,358        5,358
Ohio Building Auth. State Fac. Rev. (Arts Fac. Building Fund)  5.00%     10/1/2000         3,830        3,845
Ohio Capital Fac. GO                                           5.00%     6/15/2000         8,480        8,483
Ohio Higher Educ. Capital Fac. GO                              5.00%      2/1/2001        10,000       10,058
Ohio Higher Educ. Fac. Comm. Rev. VRDO (Kenyon College)        4.30%      6/7/2000        22,000       22,000
Ohio Higher Educ. Fac. Comm. Rev. VRDO
(Mount Union College Project)                                  4.30%      6/8/2000 LOC     1,425        1,425
Ohio Housing Finance Agency Mortgage Rev.                      4.05%      9/1/2000         2,000        2,000
Ohio Housing Finance Agency Mortgage Rev.                      4.15%      9/1/2000         5,000        5,000
Ohio PCR VRDO (Sohio Air British Petroleum Co.)                4.30%      6/2/2000         7,900        7,900
Ohio Public Fac. Comm. Rev. (Higher Educ. Capital Fac.)        4.50%     11/1/2000         2,100        2,105
Ohio Public Fac. Comm. Rev. (Higher Educ. Capital Fac.)        4.50%     12/1/2000         1,500        1,505
Ohio Public Fac. Comm. Rev. (Higher Educ. Capital Fac.)        5.00%     11/1/2000 (1)     5,540        5,569
Ohio School Dist. COP TAN                                      4.14%     6/30/2000         5,000        5,003
Ohio Solid Waste Rev. VRDO (BP Exploration & Oil Inc. Project) 4.55%      6/2/2000        33,075       33,075
Ohio State Univ. VRDO                                          3.90%      6/7/2000        20,900       20,900
Ohio State Univ. VRDO                                          4.35%      6/7/2000         4,000        4,000
Ohio Water Dev. Auth. PCR PUT (OH Edison Co. Project)          3.75%      9/1/2000 LOC     7,000        7,000
Ohio Water Dev. Auth. Rev. (Pure Water)                        5.40%      6/1/2000 (1)     3,260        3,260
Ohio Water Dev. Auth. Rev. VRDO (Duquesne Light Co.)           4.25%      6/7/2000 (2)     4,300        4,300
Ohio Water Dev. Auth. Rev. VRDO (Timken Co. Project)           4.15%      6/7/2000 LOC     5,000        5,000
Ross County OH Hosp. Fac. Rev. VRDO
        (Medical Center Hosp. Project)                         4.30%      6/8/2000 LOC     4,065        4,065
Solon OH BAN                                                   3.60%     6/15/2000         1,750        1,750
Summit County OH BAN                                           5.50%     5/31/2001         4,500        4,530
Toledo OH City Services Special Assessment VRDO                4.25%      6/8/2000 LOC    30,200       30,200
Univ. of Cincinnati OH BAN                                     4.25%     10/5/2000         5,987        5,994
Univ. of Cincinnati OH BAN                                     4.50%      3/1/2001         1,000        1,003
OUTSIDE OHIO:
Puerto Rico Govt. Dev. Bank VRDO                               3.40%      6/7/2000 (1)     5,100        5,100
Puerto Rico Highway & Transp. Auth. VRDO                       3.50%      6/7/2000 (2)       540          540
-------------------------------------------------------------------------------------------------------------------
TOTAL MUNICIPAL BONDS
         (Cost $447,718)                                                                              447,718
-------------------------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (0.1%)
-------------------------------------------------------------------------------------------------------------------
Other Assets--Note B                                                                                    6,403
Liabilities                                                                                            (5,833)
                                                                                                      -------
                                                                                                          570

-------------------------------------------------------------------------------------------------------------------
NET ASSETS (100%)
-------------------------------------------------------------------------------------------------------------------
Applicable to448,286,623 outstanding $.001 par value shares of beneficial interest
        (unlimited authorization)                                                                    $448,288
===================================================================================================================

NET ASSET VALUE PER SHARE                                                                               $1.00
===================================================================================================================
*See Note A in Notes to Financial Statements.
+Securities  exempt from  registration  under Rule 144A of the Securities Act of
1933.  These  securities may be sold in transactions  exempt from  registration,
normally to qualified  buyers.  At May 31, 2000,  the  aggregate  value of these
securities was $5,358,000, representing 1.2% of net assets.
For key to abbreviations and other references, see page 17.

-------------------------------------------------------------------------------------------------------------------
AT MAY 31, 2000, NET ASSETS CONSISTED OF:
-------------------------------------------------------------------------------------------------------------------
                                                                                                AMOUNT          PER
                                                                                                 (000)        SHARE

-------------------------------------------------------------------------------------------------------------------
Paid in Capital                                                                               $448,290        $1.00
Undistributed Net Investment Income                                                                 --           --
Accumulated Net Realized Losses                                                                    (2)           --
Unrealized Appreciation                                                                             --           --
-------------------------------------------------------------------------------------------------------------------
NET ASSETS                                                                                    $448,288        $1.00
===================================================================================================================
</TABLE>

                                       13
<PAGE>
<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
OHIO INSURED LONG-TERM TAX-EXEMPT FUND                        COUPON          DATE         (000)        (000)
-------------------------------------------------------------------------------------------------------------------
MUNICIPAL BONDS (100.3%)
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>           <C>           <C>          <C>
ISSUER INSURED (87.8%)
Adams County OH School Dist. GO                                5.55%     12/1/2009 (1)     1,000        1,012
Akron Bath & Copley OH Joint Township Hosp. Dist. Rev.
(Akron Medical Center Project)                                5.375%      1/1/2017 (2)     3,000        2,811
Akron Bath & Copley OH Joint Township Hosp. Dist. Rev.
(Akron Medical Center Project)                                 5.50%      1/1/2008 (2)     1,000        1,006
Athens OH City School Dist. GO                                 6.65%     12/1/2013 (4) +     640          710
Athens OH City School Dist. GO                                 6.65%     12/1/2014 (4) +     680          754
Athens OH City School Dist. GO                                 6.65%     12/1/2015 (4) +     725          803
Athens OH City School Dist. GO                                 6.65%     12/1/2016 (4) +     770          853
Aurora County OH School Dist. GO                               5.80%     12/1/2016 (3)     3,000        3,004
Barberton OH School Dist. GO                                  5.125%     11/1/2022 (3)     3,000        2,659
Bedford Heights OH GO                                          5.65%     12/1/2014 (2)       500          499
Butler County OH Sewer System Rev.                             5.00%     12/1/2023 (2)     2,245        1,936
Butler County OH Sewer System Rev.                            5.375%     12/1/2015 (3)     1,730        1,662
Butler County OH Sewer System Rev.                             6.25%     12/1/2002 (2)
                                                                                (Prere.)   2,925        3,039
Butler County OH Transp. Improvement Dist. Rev.                6.00%      4/1/2011 (4)     4,000        4,156
Butler County OH Transp. Improvement Dist. Rev.                6.00%      4/1/2012 (4)     2,320        2,398
Canal Winchester OH Local School Dist. GO                      6.00%     12/1/2013 (3)     1,680        1,731
Canton OH GO                                                  5.375%     12/1/2007 (2)     1,000        1,005
Canton OH GO (Water Works System)                              5.75%     12/1/2010 (2)     1,000        1,021
Canton OH GO (Water Works System)                              5.85%     12/1/2015 (2)     1,000        1,007
Clermont County OH Hosp. Fac. Rev. (Mercy Health System)       5.50%      9/1/2006 (2)     2,500        2,524
Cleveland OH Airport System Rev.                               0.00%      1/1/2005 (1)     3,975        3,114
Cleveland OH Airport System Rev.                              5.125%      1/1/2022 (4)     6,025        5,208
Cleveland OH GO                                               5.375%      9/1/2010 (2)     1,000          996
Cleveland OH GO                                               5.375%      9/1/2012 (2)     1,000          990
Cleveland OH GO                                                5.50%      8/1/2009 (1)     4,500        4,542
Cleveland OH GO                                                6.25%     10/1/2001 (1)
                                                                                (Prere.)   2,500        2,593
Cleveland OH Public Power System Rev.                          5.25%    11/15/2016 (1)     5,950       5,588
Cleveland OH School Dist. GO                                   0.00%     12/1/2005 (3)       700          522
Cleveland OH School Dist. GO                                   0.00%     12/1/2006 (3)       700          494
Cleveland OH School Dist. GO                                   0.00%     12/1/2007 (3)       500          333
Cleveland OH School Dist. GO                                   0.00%     12/1/2008 (3)       400          251
Cleveland OH School Dist. GO                                  5.875%     12/1/2011 (3)     1,500        1,526
Cleveland OH Water Works Rev.                                  5.00%      1/1/2023 (4)     3,000        2,595
Cleveland OH Water Works Rev.                                  5.00%      1/1/2028 (4)     2,000        1,699
Cleveland OH Water Works Rev.                                  5.50%      1/1/2013 (1)     3,805        3,795
Cleveland OH Water Works Rev.                                  5.50%      1/1/2021 (1) **  6,500        6,207
Cleveland OH Water Works Rev.                                  6.25%      1/1/2015 (2)       195          200
Cleveland-Cuyahoga County OH Port Auth. Rev.
(Rock & Roll Hall of Fame)                                     5.40%     12/1/2015 (2)     2,000        1,930
Columbus OH Muni. Airport Auth. Rev. (Port of Columbus)        5.00%      1/1/2028 (2)     3,000        2,544
Columbus OH School Dist. GO                                    7.00%     12/1/2000 (3)
                                                                                (Prere.)   1,750        1,805
Cuyahoga County OH Hosp. Rev. (Univ. Hosp. Health System)     5.375%     1/15/2009 (1)     3,500        3,465
Cuyahoga County OH Hosp. Rev. (Univ. Hosp. Health System)      5.50%     1/15/2019 (1)     7,545        7,101
Cuyahoga County OH Hosp. Rev. (W.O. Walker Center Inc.)        5.00%      1/1/2023 (2)     2,500        2,138
Defiance OH Waterworks System GO                               5.65%     12/1/2018 (2)     1,130        1,100
Dublin OH School Dist. GO                                      0.00%     12/1/2005 (3)     1,220          910
Dublin OH School Dist. GO                                      0.00%     12/1/2006 (3)     1,220          860
Fairfield County OH Hosp. Rev. (Lancaster-Fairfield Hosp.)    5.375%     6/15/2015 (1)     3,000        2,885
Forest Hills OH School Dist. GO                                6.00%     12/1/2007 (1)       750          785
Franklin County OH Convention Center Rev.                      0.00%     12/1/2007 (1)     4,355        2,897
Franklin County OH Convention Center Rev.                      5.00%     12/1/2027 (1)     2,000        1,706
Franklin County OH Convention Center Rev.                      7.00%     12/1/2000 (1)
                                                                                (Prere.)     675          696
Gallia County OH Hosp. Rev. (Holzer Medical Center Project)   5.125%     10/1/2013 (2)     3,000        2,803
Greater Cleveland OH Regional Transp. Auth. GO                 5.00%     12/1/2018 (3)     5,000        4,451
Greater Cleveland OH Regional Transp. Auth. GO                5.375%     12/1/2010 (3)     1,665        1,659
Greater Cleveland OH Regional Transp. Auth. GO                5.375%     12/1/2012 (3)     1,500        1,474
Greater Cleveland OH Regional Transp. Auth. GO                5.375%     12/1/2013 (3)     1,850        1,806
</TABLE>

                                       14

<PAGE>
<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
                                                              COUPON          DATE         (000)        (000)
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>           <C>           <C>          <C>
Greater Cleveland OH Regional Transp. Auth. GO                 5.60%     12/1/2011 (3)     5,505        5,556
Greater Cleveland OH Regional Transp. Auth. GO                 5.65%     12/1/2006 (3)
                                                                                (Prere.)   1,000        1,033
Greene County OH Sewer System Rev.                            5.125%     12/1/2020 (1)     2,000        1,789
Hamilton County OH Hosp. Fac. Rev. (Children's Hosp.)          5.20%     5/15/2009 (1)     2,000        1,960
Hamilton County OH Hosp. Fac. Rev. (Children's Hosp.)         5.375%     5/15/2013 (1)     2,235        2,171
Hamilton County OH Hosp. Fac. Rev. VRDO
(Health Alliance of Greater Cincinnati)                        3.90%      6/7/2000 (1)       230          230
Hamilton County OH Sales Tax Rev.
        (Hamilton County Football Project)                     4.75%     12/1/2027 (1)     1,500        1,222
Hamilton County OH Sales Tax Rev.
        (Hamilton County Football Project)                     5.00%     12/1/2018 (1)     3,000        2,667
Hamilton County OH Sales Tax Rev.
        (Hamilton County Football Project)                     5.00%     12/1/2027 (1)     9,600        8,190
Hamilton County OH Sales Tax Rev.
        (Hamilton County Football Project)                     5.50%     12/1/2013 (1)     2,000        1,972
Hamilton County OH Sewer System Rev.                           5.45%     12/1/2009 (3)     3,250        3,276
Hamilton OH Water System Rev.                                  6.30%    10/15/2021 (1)     2,000        2,023
Hilliard OH School Dist. GO                                    5.75%     12/1/2019 (3)     2,000        1,961
Hilliard OH School Dist. GO                                    6.55%     12/1/2005 (3)       500          532
Hilliard OH School Dist. GO                                    0.00%     12/1/2012 (3)     3,220        1,562
Hilliard OH School Dist. GO                                    0.00%     12/1/2013 (3)     3,220        1,463
Hilliard OH School Dist. GO                                    0.00%     12/1/2014 (3)     2,720        1,156
Hilliard OH School Dist. GO                                    0.00%     12/1/2015 (3)     3,720        1,479
Lake County OH Hosp. Fac. Rev. (Lake Hosp. System Inc.)       5.375%     8/15/2015 (2)     2,900        2,785
Lake Ohio Local School Dist. Stark County OH GO                5.55%     12/1/2014 (3)     1,000          987
Lake Ohio Local School Dist. Stark County OH GO                5.75%     12/1/2021 (3)     1,000          976
Lake Ohio Local School Dist. Stark County OH GO                5.75%     12/1/2026 (3)     4,540        4,385
Lakota OH Local School Dist. GO                                5.05%     12/1/2013 (3)     1,925        1,805
Lisbon OH School Dist. GO                                      6.25%     12/1/2017 (2)     1,000        1,025
Lorain County OH Hosp. Rev. (Catholic Healthcare Partners)    5.625%      9/1/2014 (1)     3,290        3,253
Lorain County OH Hosp. Rev. (Catholic Healthcare Partners)     6.00%      9/1/2006 (1)     1,500        1,556
Lorain County OH Hosp. Rev. (Catholic Healthcare Partners)     6.00%      9/1/2008 (1)     1,250        1,301
Loveland OH City School Dist. GO                               5.25%     12/1/2014 (1)     1,230        1,174
Lucas County OH Hospital Rev.
(ProMedica Healthcare Obligated Group)                        5.625%    11/15/2015 (2)     2,500        2,456
Lucas County OH Hospital Rev.
(ProMedica Healthcare Obligated Group)                        5.625%    11/15/2017 (2)     2,075        2,013
Lucas County OH Hospital Rev.
(ProMedica Healthcare Obligated Group)                         5.75%    11/15/2009 (1)     3,000        3,066
Lucas County OH Hospital Rev.
(ProMedica Healthcare Obligated Group)                         5.75%    11/15/2014 (1)     6,000        6,047
Mahoning Valley Sanitation Dist. Water Rev.                    5.75%    11/15/2018 (4)     1,300        1,281
Marietta OH City School Dist. GO                               5.75%     12/1/2007 (2)     1,500        1,527
Marysville OH Water System Rev.                                7.05%     12/1/2001 (1)
                                                                                (Prere.)   1,250        1,301
Medina OH School Dist. GO                                      6.20%     12/1/2002 (3)
                                                                                (Prere.)   2,100        2,198
Middletown OH GO                                               5.75%     12/1/2019 (1)     2,500        2,465
Mount Vernon OH Sewer System Rev.                              6.00%     12/1/2012 (2)       750          763
New Philadelphia OH School Dist. GO                            6.25%     12/1/2017 (2)     2,300        2,343
North Canton OH GO                                             5.90%     12/1/2004 (2)
                                                                                (Prere.)   2,000        2,097
Northeast OH Regional Sewer Dist. Rev.                         5.60%    11/15/2013 (2)     1,880        1,876
Northeast OH Regional Sewer Dist. Rev.                         5.60%    11/15/2014 (2)     1,500        1,488
Northwest OH Local School Dist. GO                             5.15%     12/1/2022 (3)     2,095        1,865
Oak Hills OH Local School Dist. GO                             7.20%     12/1/2009 (1)     1,625        1,836
Ohio Air Quality Dev. Auth. PCR (Ohio Edison Project)          7.10%      6/1/2018 (3)     1,000        1,020
Ohio Building Auth. Rev. (Adult Correctional Fac.)             5.50%      4/1/2016 (2)     4,965        4,812
Ohio Building Auth. Rev. (Adult Correctional Fac.)             5.95%     10/1/2013 (1)     3,000        3,053
Ohio Higher Educ. Fac. Rev. (Oberlin College)                  5.00%     10/1/2026 (2)    10,000        8,555
Ohio Higher Educ. Fac. Rev. (Univ. of Dayton)                  0.00%     12/1/2006 (3)     1,000          705
Ohio Higher Educ. Fac. Rev. (Univ. of Dayton)                  6.60%     12/1/2017 (3)     2,200        2,324
Ohio Higher Educ. Fac. Rev. (Univ. of Dayton)                  6.75%     12/1/2015 (3)     1,000        1,051
Ohio Higher Educ. Fac. Rev. (Xavier Univ.)                     5.30%     5/15/2017 (1)     3,000        2,818
Ohio Higher Educ. Fac. Rev. (Xavier Univ.)                    5.375%     5/15/2022 (1)     7,000        6,478
Ohio Higher Educ. Fac. Rev. (Xavier Univ.)                     6.00%     5/15/2011 (1)     2,000        2,067
Ohio Turnpike Comm. Rev.                                       4.50%     2/15/2024 (3)     3,000        2,355
Ohio Turnpike Comm. Rev.                                       5.25%     2/15/2013 (3)     1,780        1,714
</TABLE>

                                       15

<PAGE>
<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
OHIO INSURED LONG-TERM TAX-EXEMPT FUND                        COUPON          DATE         (000)        (000)
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>           <C>           <C>          <C>
Ohio Turnpike Comm. Rev.                                       5.70%     2/15/2006 (1)
                                                                                (Prere.)   1,000        1,040
Ohio Univ. General Receipts Rev.                               5.25%     12/1/2019 (4)     4,000        3,666
Ohio Water Dev. Auth. Pollution Control Fac. Rev.             5.125%      6/1/2019 (1)     2,750        2,485
Ohio Water Dev. Auth. Pollution Control Fac. Rev.              5.50%      6/1/2011 (1)     2,300        2,300
Ohio Water Dev. Auth. Pollution Control Fac. Rev.              5.50%     12/1/2014 (1)     1,195        1,173
Ohio Water Dev. Auth. Rev. (Fresh Water)                       5.25%     12/1/2012 (4)     2,990        2,899
Ohio Water Dev. Auth. Rev. (Fresh Water)                       5.90%     12/1/2015 (2)     3,250        3,281
Ohio Water Dev. Auth. Rev. (Pure Water)                        5.50%     12/1/2011 (2)     1,000        1,000
Ohio Water Dev. Auth. Rev. (Pure Water)                        7.00%     12/1/2009 (2)(ETM)1,500        1,625
Olmsted Falls OH School Dist. GO                               5.85%    12/15/2017 (3)     2,000        2,000
Olmsted Falls OH School Dist. GO                               6.85%    12/15/2004 (3)
                                                                                (Prere.)     565          614
Ottowa County OH GO                                            7.00%      9/1/2001 (2)
                                                                                (Prere.)     500          523
Perrysburg OH Exempted Village School Dist. GO                 5.00%     12/1/2025 (4)     2,850        2,450
Perrysburg OH Exempted Village School Dist. GO                 5.75%     12/1/2013 (4)     1,385        1,414
Pickerington OH Local School Dist. GO                          5.00%     12/1/2019 (2)     3,000        2,661
Pickerington OH Local School Dist. GO                          5.80%     12/1/2009 (3)       500          513
Revere OH School Dist. GO                                      6.00%     12/1/2016 (2)     3,850        3,889
Reynoldsburg OH School Dist. GO                                0.00%     12/1/2009 (3)     1,465          865
Reynoldsburg OH School Dist. GO                                0.00%     12/1/2010 (3)     1,465          814
Reynoldsburg OH School Dist. GO                                6.55%     12/1/2002 (3)
                                                                                (Prere.)   3,600        3,798
Richland County OH GO                                          5.40%     12/1/2015 (2)     1,120        1,079
Richland County OH GO                                          6.95%     12/1/2011 (2)       450          489
South-Western City School Dist. Franklin &
        Pickway County OH GO                                   4.75%     12/1/2026 (2)     1,750        1,426
Springboro OH Community City School Dist. GO                   5.25%     12/1/2016 (2)     3,000        2,826
Summit County OH GO                                            6.25%     12/1/2012 (3) +   1,420        1,507
Summit County OH GO                                            6.50%     12/1/2016 (3) +   2,000        2,134
Summit County OH GO                                            6.90%      8/1/2002 (2)
                                                                                (Prere.)     175          182
Summit County OH GO                                            6.90%      8/1/2003 (2)
                                                                                (Prere.)   2,425        2,556
Toledo OH Waterworks Rev.                                      5.25%    11/15/2013 (3)     2,000        1,923
Trumbull County OH Hosp. Rev. (Trumbull Memorial Hosp.)        6.25%    11/15/2003 (3)
                                                                                (Prere.)   2,000        2,074
Univ. of Akron OH General Receipts Rev.                        5.50%      1/1/2019 (3)     3,045        2,905
Wood County OH GO (Justice Center)                             5.95%     12/1/2007 (2)     1,750        1,798
Woodridge OH School Dist. GO                                   6.00%     12/1/2019 (2)     1,000        1,005
Woodridge OH School Dist. GO                                   6.80%     12/1/2014 (2)     2,000        2,251
Wooster OH School Dist. GO                                     0.00%     12/1/2009 (4)     2,195        1,296
Wooster OH School Dist. GO                                     0.00%     12/1/2010 (4)     2,265        1,259
Wooster OH School Dist. GO                                     0.00%     12/1/2011 (4)     2,315        1,208
Wyoming OH School Dist.                                        5.15%     12/1/2027 (3)     3,250        2,851
OUTSIDE OHIO:
Puerto Rico Govt. Dev. Bank VRDO                               3.40%      6/7/2000 (1)       400          400
Puerto Rico Public Building Auth. Rev.                         0.00%      7/1/2001 (3)       850          808
Puerto Rico Public Building Auth. Rev.                         5.00%      7/1/2027 (2)     1,500        1,301
                                                                                                        -----
                                                                                                      321,609
                                                                                                      -------
SECONDARY MARKET INSURED (2.4%)
Franklin County OH Hosp. Rev.
(Mount Carmel Health-Holy Cross Health System)                 6.75%      6/1/2002 (1)
                                                                                (Prere.)   2,000        2,103
Ohio Higher Educ. Fac. Rev. (John Carroll Univ.)               5.75%      4/1/2019 (1)     4,000        3,932
Ohio Higher Educ. Fac. Rev. (John Carroll Univ.)               5.85%      4/1/2020 (1)     2,875        2,848
                                                                                                        -----
                                                                                                        8,883
                                                                                                        -----

NONINSURED (10.1%)
Clermont County OH Hosp. Rev. VRDO (Mercy Health Systems)      4.15%      6/7/2000         1,200        1,200
Columbus OH GO                                                 5.25%     5/15/2009         1,000          996
Cuyahoga County OH Hosp. Rev. (Cleveland Clinic Health)       5.125%      1/1/2029         1,250        1,048
Franklin County OH GO                                          5.00%     12/1/2017         3,780        3,408
Franklin County OH GO                                         5.375%     12/1/2020         9,255        8,671
Ohio Air Quality Dev. Auth. VRDO
(Cincinnati Gas & Electric Co. Project)                        4.30%      6/2/2000 LOC     5,300        5,300
Ohio Air Quality Dev. Auth. VRDO
(Cincinnati Gas & Electric Co. Project)                        4.45%      6/2/2000 LOC     3,400        3,400
Ohio Higher Educ. Fac. Rev. (Case Western Reserve Univ.)       6.50%     10/1/2020           250          270
</TABLE>

                                       16
<PAGE>


<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------
                                                                                            FACE       MARKET
                                                                          MATURITY        AMOUNT       VALUE*
                                                              COUPON          DATE          (000)       (000)
-------------------------------------------------------------------------------------------------------------------
<S>                                                              <C>          <C>           <C>          <C>
Ohio Housing Finance Agency Mortgage Rev.                     5.025%      3/1/2021         2,705        2,639
Ohio State Univ. General Receipts Rev.                         5.75%     12/1/2013         1,000        1,011
Ohio State Univ. General Receipts Rev.                         5.75%     12/1/2014         1,000        1,006
Ohio State Univ. General Receipts Rev. VRDO                    3.90%      6/7/2000         2,600        2,600
Rocky River OH City School Dist. GO                           5.375%     12/1/2017         2,200        2,105
Sycamore OH Community School Dist. GO                          5.00%     12/1/2023         4,000        3,450
                                                                                                        -----
                                                                                                       37,104
                                                                                                       ------

-------------------------------------------------------------------------------------------------------------------
TOTAL MUNICIPAL BONDS
         (Cost $380,375)                                                                              367,596
-------------------------------------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-0.3%)
-------------------------------------------------------------------------------------------------------------------
Other Assets--Note B                                                                                    7,107
Liabilities                                                                                            (8,085)
                                                                                                         (978)

-------------------------------------------------------------------------------------------------------------------
NET ASSETS (100%)
Applicable to 33,286,336 outstanding $.001 par value shares of beneficial interest
(unlimited authorization)                                                                            $366,618
===================================================================================================================

NET ASSET VALUE PER SHARE                                                                              $11.01
===================================================================================================================
</TABLE>
*See Note A in Notes to Financial Statements.
**Securities with a value of $477,000 have been segregated as initial margin for
open futures contracts. +Security purchased on a when-issued or delayed delivery
basis for which the fund has not taken delivery as of May 31, 2000.
For key to abbreviations and other references, see below.

--------------------------------------------------------------------------------
AT MAY 31, 2000, NET ASSETS CONSISTED OF:
--------------------------------------------------------------------------------
                                                                AMOUNT      PER
                                                                 (000)    SHARE
--------------------------------------------------------------------------------
Paid in Capital                                               $378,980   $11.38
Undistributed Net Investment Income                                 --       --
Accumulated Net Realized Gains                                     612      .02
Unrealized Depreciation--Note F
         Investment Securities                                (12,779)     (.38)
         Futures Contracts                                       (195)     (.01)
--------------------------------------------------------------------------------
NET ASSETS                                                    $366,618    $11.01
================================================================================

KEY TO ABBREVIATIONS

BAN--Bond Anticipation Note.
COP--Certificate of Participation.
GO--General Obligation Bond.
PCR--Pollution Control Revenue Bond.
PUT--Put Option Obligation.
TAN--Tax Anticipation Note.
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.

LOC--Scheduled  principal and interest payments are guaranteed by bank letter of
credit.

                                       17
<PAGE>

STATEMENT OF OPERATIONS
This Statement shows interest  earned by each 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.

--------------------------------------------------------------------------------
                                                                   OHIO INSURED
                                                OHIO TAX-EXEMPT       LONG-TERM
                                                   MONEY MARKET      TAX-EXEMPT
                                                           FUND            FUND
                                               ---------------------------------
                                                 SIX MONTHS ENDED MAY 31, 2000
                                               ---------------------------------
                                                           (000)           (000)
--------------------------------------------------------------------------------
INVESTMENT INCOME
INCOME
    Interest                                             $9,054         $10,181
                                               ---------------------------------
       Total Income                                       9,054          10,181
                                               ---------------------------------
EXPENSES
    The Vanguard Group--Note B
       Investment Advisory Services                          27              22
       Management and Administrative                        303             286
       Marketing and Distribution                            46              32
    Custodian Fees                                            3               2
    Auditing Fees                                             4               4
    Shareholders' Reports                                     8              11
                                               ---------------------------------
       Total Expenses                                       391             357
       Expenses Paid Indirectly--Note C                      (3)             (2)
                                               ---------------------------------
       Net Expenses                                         388             355
--------------------------------------------------------------------------------
NET INVESTMENT INCOME                                     8,666           9,826
--------------------------------------------------------------------------------
REALIZED NET GAIN (LOSS)
    Investment Securities Sold                                8           1,265
    Futures Contracts                                        --            (54)
--------------------------------------------------------------------------------
REALIZED NET GAIN                                             8           1,211
--------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)
    Investment Securities                                    --          (6,317)
    Futures Contracts                                        --            (195)
--------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION (DEPRECIATION)             --          (6,512)
--------------------------------------------------------------------------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS     $8,674        $  4,525
================================================================================

                                       18

<PAGE>


STATEMENT OF CHANGES IN NET ASSETS
This  Statement  shows how each 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>
-----------------------------------------------------------------------------------------------------------
                                                 OHIO TAX-EXEMPT                   OHIO INSURED LONG-TERM
                                                 MONEY MARKET FUND                     TAX-EXEMPT FUND
                                        ----------------------------------   ------------------------------
                                          SIX MONTHS           YEAR           SIX MONTHS             YEAR
                                               ENDED          ENDED                ENDED            ENDED
                                        MAY 31, 2000  NOV. 30, 1999         MAY 31, 2000    NOV. 30, 1999
                                                (000)          (000)                (000)            (000)
-----------------------------------------------------------------------------------------------------------
<S>                                     <C>             <C>                     <C>             <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
    Net Investment Income                   $  8,666      $  11,490             $  9,826        $  18,097
    Realized Net Gain (Loss)                       8             (6)               1,211              144
    Change in Unrealized Appreciation
     (Depreciation)                               --             --               (6,512)         (26,052)
                                        -------------------------------------------------------------------
        Net Increase (Decrease) in Net
        Assets Resulting from Operations       8,674         11,484                4,525           (7,811)
                                        -------------------------------------------------------------------
DISTRIBUTIONS
    Net Investment Income                     (8,666)       (11,490)              (9,826)         (18,097)
    Realized Capital Gain                         --             --                   --             (611)
                                        -------------------------------------------------------------------
        Total Distributions                   (8,666)       (11,490)              (9,826)         (18,708)
                                        -------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS1
    Issued                                   284,164        446,766               46,354          148,841
    Issued in Lieu of Cash Distributions       7,093         10,486                6,994           13,289
    Redeemed                                (288,191)      (356,696)             (60,751)         (80,072)
        Net Increase (Decrease) from
            Capital Share Transactions         3,066        100,556               (7,403)          82,058
-----------------------------------------------------------------------------------------------------------
    Total Increase (Decrease)                  3,074        100,550              (12,704)          55,539
-----------------------------------------------------------------------------------------------------------
NET ASSETS
    Beginning of Period                      445,214        344,664              379,322          323,783
    End of Period                           $448,288       $445,214             $366,618         $379,322
===========================================================================================================
1Shares Issued (Redeemed)
    Issued                                   284,164        446,766                4,184           12,743
    Issued in Lieu of Cash Distributions       7,093         10,486                  631            1,145
    Redeemed                                (288,191)      (356,696)              (5,480)          (6,884)
        Net Increase (Decrease) in
            Shares Outstanding                 3,066        100,556                 (665)           7,004
===========================================================================================================
</TABLE>


                                      19

<PAGE>

FINANCIAL HIGHLIGHTS
This table  summarizes  each  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.  Money market  funds are not  required to report a Portfolio  Turnover
Rate.

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------
                                                                        OHIO TAX-EXEMPT MONEY MARKET FUND
                                                                              YEAR ENDED NOVEMBER 30,
FOR A SHARE OUTSTANDING                         SIX MONTHS ENDED  --------------------------------------------
THROUGHOUT EACH PERIOD                              MAY 31, 2000     1999     1998     1997     1996     1995
--------------------------------------------------------------------------------------------------------------
<S>                                                        <C>      <C>      <C>      <C>      <C>      <C>
NET ASSET VALUE, BEGINNING OF PERIOD                       $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
--------------------------------------------------------------------------------------------------------------
INVESTMENT OPERATIONS
    Net Investment Income                                   .018     .030     .033     .034     .034     .037
    Net Realized and Unrealized Gain (Loss)
        on Investments                                        --       --       --        --      --       --
                                                        ------------------------------------------------------
        Total from Investment Operations                    .018     .030     .033     .034     .034     .037
                                                        ------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net Investment Income                   (.018)   (.030)   (.033)   (.034)   (.034)   (.037)
    Distributions from Realized Capital Gains                 --       --       --       --       --       --
                                                        ------------------------------------------------------
        Total Distributions                                (.018)   (.030)   (.033)   (.034)   (.034)   (.037)
--------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                             $1.00    $1.00    $1.00    $1.00    $1.00    $1.00
==============================================================================================================

TOTAL RETURN                                                1.86%    3.04%    3.37%    3.49%    3.42%    3.78%
==============================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period (Millions)                    $448     $445     $345     $298     $254     $178
    Ratio of Total Expenses to
         Average Net Assets                                 0.16%*   0.18%    0.20%    0.19%    0.20%    0.21%
    Ratio of Net Investment Income to
         Average Net Assets                                 3.64%*   3.00%    3.30%    3.43%    3.36%    3.71%
==============================================================================================================
</TABLE>
*Annualized.


                                       20

<PAGE>
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------
                                                                       OHIO INSURED LONG-TERM TAX-EXEMPT FUND
                                                                              YEAR ENDED NOVEMBER 30,
FOR A SHARE OUTSTANDING                         SIX MONTHS ENDED  --------------------------------------------
THROUGHOUT EACH PERIOD                              MAY 31, 2000     1999     1998     1997     1996     1995
--------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, BEGINNING OF PERIOD                      $11.17   $12.02   $11.72   $11.67   $11.63   $10.28
--------------------------------------------------------------------------------------------------------------
<S>                                                      <C>        <C>       <C>      <C>      <C>      <C>
INVESTMENT OPERATIONS
    Net Investment Income                                   .297     .582     .592     .598     .603     .610
    Net Realized and Unrealized Gain (Loss)
         on Investments                                    (.160)   (.827)    .300     .110     .040    1.350
                                                        ------------------------------------------------------
         Total from Investment Operations                   .137    (.245)    .892     .708     .643    1.960
                                                        ------------------------------------------------------
DISTRIBUTIONS
    Dividends from Net Investment Income                   (.297)   (.582)   (.592)   (.598)   (.603)   (.610)
    Distributions from Realized Capital Gains                 --    (.023)      --    (.060)      --       --
         Total Distributions                               (.297)   (.605)   (.592)   (.658)   (.603)   (.610)
--------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD                            $11.01   $11.17   $12.02   $11.72   $11.67   $11.63
==============================================================================================================

TOTAL RETURN                                                1.24%   -2.13%    7.78%    6.30%    5.75%   19.45%
==============================================================================================================

RATIOS/SUPPLEMENTAL DATA
    Net Assets, End of Period (Millions)                    $367     $379     $324     $253     $216     $197
    Ratio of Total Expenses to
         Average Net Assets                                 0.19%*   0.19%    0.20%    0.17%    0.20%    0.21%
    Ratio of Net Investment Income to
         Average Net Assets                                 5.29%*   5.00%    4.98%    5.17%    5.26%    5.45%
    Portfolio Turnover Rate                                   18%*      8%       8%      14%      17%       7%
==============================================================================================================
</TABLE>
*Annualized.

                                       21
<PAGE>

NOTES TO FINANCIAL STATEMENTS
Vanguard Ohio Tax-Exempt  Funds comprise the Ohio  Tax-Exempt  Money Market Fund
and Ohio Insured  Long-Term  Tax-Exempt  Fund, each of which is registered under
the Investment Company Act of 1940 as a diversified open-end investment company,
or mutual fund. Each 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 Ohio.

A. The following  significant  accounting policies conform to generally accepted
accounting  principles  for mutual  funds.  The funds  consistently  follow such
policies in preparing their financial statements.
     1. SECURITY VALUATION:  Tax-Exempt Money Market Fund: Investment securities
are valued at amortized cost, which approximates market value. Insured Long-Term
Tax-Exempt Fund:  Bonds,  and temporary cash  investments  acquired more than 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
available  are valued by methods  deemed by the board of trustees  to  represent
fair value.
     2.  FEDERAL  INCOME  TAXES:  Each 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  Insured  Long-Term  Tax-Exempt  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.

                                       22
<PAGE>


B.  The  Vanguard  Group  furnishes  at  cost  investment  advisory,   corporate
management,  administrative,  marketing, and distribution services. The costs of
such services are allocated to each fund under methods  approved by the board of
trustees.  Each fund has  committed  to provide up to 0.40% of its net assets in
capital  contributions  to Vanguard.  At May 31, 2000, the funds had contributed
capital to Vanguard (included in Other Assets) of:

--------------------------------------------------------------------------------
                        CAPITAL CONTRIBUTION       PERCENTAGE      PERCENTAGE OF
                            TO VANGUARD              OF FUND        VANGUARD'S
OHIO TAX-EXEMPT FUND           (000)               NET ASSETS     CAPITALIZATION
--------------------------------------------------------------------------------
Money Market                    $91                   0.02%            0.09%
Insured Long-Term                71                   0.02             0.07
--------------------------------------------------------------------------------
The funds' trustees and officers are also directors and officers of Vanguard.

C. The  funds'  custodian  bank has  agreed  to  reduce  its fees when the funds
maintain cash on deposit in their non-interest-bearing custody accounts. For the
six  months  ended May 31,  2000,  custodian  fee  offset  arrangements  reduced
expenses of the Tax-Exempt  Money Market Fund and Insured  Long-Term  Tax-Exempt
Fund by $3,000 and $2,000, respectively.

D. During the six months ended May 31, 2000,  the Insured  Long-Term  Tax-Exempt
Fund  purchased  $32,800,000 of investment  securities  and sold  $32,716,000 of
investment securities, other than temporary cash investments.

E. Capital gains 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 Insured  Long-Term  Tax-Exempt Fund had
realized losses totaling  $506,000 through November 30, 1999, which are deferred
for tax purposes and reduce the amount of unrealized  appreciation on investment
securities  for tax purposes  (see Note F). At November  30, 1999,  the fund had
available  capital  losses of $93,000 to offset future net capital gains through
November 30, 2007.

F. At May 31, 2000, net unrealized  depreciation of Insured Long-Term Tax-Exempt
Fund  investment  securities  for federal  income tax purposes was  $13,285,000,
consisting  of unrealized  gains of  $2,420,000 on securities  that had risen in
value since their purchase and  $15,705,000  in unrealized  losses on securities
that had fallen in value since their purchase (see Note E).
     At May 31, 2000, the aggregate  settlement value of open futures  contracts
expiring in September 2000 and the related unrealized depreciation were:

--------------------------------------------------------------------------------
                                                              (000)
                                                  ------------------------------
                                                   AGGREGATE
OHIO TAX-EXEMPT FUND/           NUMBER OF         SETTLEMENT     UNREALIZED
FUTURES CONTRACTS            SHORT CONTRACTS         VALUE      DEPRECIATION
--------------------------------------------------------------------------------
Insured Long-Term/
Municipal Bond Index               140             $13,020       $  (95)
U.S. Treasury Bond                  45               4,303         (100)
--------------------------------------------------------------------------------

                                       23
<PAGE>

THE VANGUARD(R)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(TM) 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(TM) 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(TM) Fund
Windsor(TM) II Fund


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


BOND FUNDS
---------------------------------------
Admiral(TM) Intermediate-Term
  Treasury Fund
Admiral(TM)Long-Term Treasury Fund
Admiral(TM)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(TM) 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.

                                       24
<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.

   Seven of Vanguard's  eight 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 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.

BRUCE K.  MACLAURY  (1990)  President  Emeritus  of The  Brookings  Institution;
Director of  American  Express  Bank Ltd.,  The St. Paul  Companies,  Inc.,  and
National Steel Corp.

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.

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
AmeriSource Health Corporation,  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  Quantitative Equity Group.

<PAGE>
[SHIP]
THE VANGUARD GROUP LOGO]
Post Office Box 2600
Valley Forge, Pennsylvania 19482-2600




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.

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.

Q962 072000
(C)2000 The Vanguard Group, Inc.
All rights reserved.
Vanguard Marketing
Corporation, Distributor.



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