VANGUARD OHIO TAX FREE FUND
N-30D, 1994-07-28
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<PAGE>   1

CHAIRMAN'S LETTER

DEAR SHAREHOLDER:

The six months ended May 31, the first half of the 1994 fiscal year for the
eleven Portfolios of the Vanguard State Tax-Free Funds, witnessed something
that we have not seen much of since 1987: rising interest rates. As a result,
the prices of long-term municipal bonds declined during the period, while the
income from money market instruments received a nice boost.

        This environment, of course, negatively impacted the net asset values
of each of our Insured Long-Term Portfolios, as reflected in the table on page
2. (The net asset values of our Money Market Portfolios, as you would expect,
remained constant, at $1.00 per share.) While fluctuating asset values are part
and parcel of bond investing, our Long-Term Portfolios exceeded the total
returns (capital change plus income) achieved by competitive state tax-free
bond funds. What is more, all of our Portfolios remain virtually peerless in
the mutual fund field with respect to their investment quality, as shown in the
third column of the table on page 2. In summary form, here are the Portfolio
highlights over the past twelve months:

* THE STATE MONEY MARKET PORTFOLIOS--provided total returns ranging from +2.2%
to +2.3% . . . current yields are in the area of 2.6%, about the same as they
were twelve months ago but nicely above their level at the outset of the fiscal
half year . . . net asset values remained at $1.00 per share.

* THE STATE INSURED LONG-TERM PORTFOLIOS--reflecting the rebound in interest
rates, turned in modest total returns ranging from +1.9% to +3.3% . . . current
income yields are running about 5.4%, some 40 basis points (0.40%) higher than
they were twelve months ago.
        
        The detailed results for each of our State Tax-Free Portfolios--
including per share net asset values, dividends, and capital gains
distributions, as well as current yields--are presented on the following page.
To provide some perspective on how our Insured Long-Term Portfolios fared in
the face of rising interest rates, the table that follows summarizes the income
returns and the capital returns for each Portfolio:

<TABLE>
<CAPTION>
- - -------------------------------------------------------------------------------------------------
                                                              Investment Returns
                                                             Twelve Months Ended
                                                                 May 31, 1994
                                            -----------------------------------------------------
Portfolio*                                  Income                 Capital                  Total
- - -------------------------------------------------------------------------------------------------
<S>                                          <C>                     <C>                    <C>
CALIFORNIA                                   +5.4%                   -3.5%                  +1.9%
NEW YORK                                     +5.4                    -3.2                   +2.2
PENNSYLVANIA                                 +5.6                    -2.3                   +3.3
NEW JERSEY                                   +5.3                    -3.4                   +1.9
OHIO                                         +5.2                    -2.8                   +2.4
FLORIDA                                      +5.1                    -2.2                   +2.9
- - -------------------------------------------------------------------------------------------------
</TABLE>

*On March 4, 1994, the California Insured Intermediate-Term Portfolio was
 introduced.  Since its inception, the Portfolio has achieved an income return
 of +1.0%, a capital return of +0.4%, and a total return of +1.4%.

* FIXED-INCOME MARKET REVIEW
The basic benchmark for the bond market is the long-term U.S. Treasury bond.
During the past six months, its yield rose from 6.3% at the start of the period
to 7.4% at its conclusion. This yield change engendered a decline of about -13%
in the Treasury bond's price. I am happy to report that the tax-exempt bond
market fared a good bit better, with the yield on long-term high-grade
municipal bonds rising from 5.5% to 6.1%, resulting in a price decline of some
- - -8%. However painful this decline may be for investors in long-term bonds, it
is worth noting that interest rates had been dropping steadily for some seven
years, and the retracement during the past six months has merely returned rates
to the level prevailing at the end of 1992.

         A primary cause of the interest rate rise was investor fears about a
resurgence of inflation. So far, at least, there is little evidence of it. The
U.S. Consumer Price Index has risen just 2.3% over the past twelve months,
although more sensitive indicators--such as commodity prices--have been rising
at a much higher rate. In an effort to quell these inflationary fears, the
Federal Reserve acted to "tighten" the money supply and slow economic growth
and potential future inflation, raising the

                                       1

<PAGE>   2

Federal funds rate (at which banks borrow from one another) four times--in
February, March, April, and again in May--from 3.00% to 4.25%.

         These increases in short-term rates are often seen by market
participants as a restraint on potential inflation, and thus cause long-term
rates to fall. This time around, quite the reverse has been true. In any event,
proving that "it is an ill wind (indeed) that blows no good," the rate increase
has added to the income received by investors in our Money Market Portfolios.
And, because of the "lag" from the date interest rates rise until they are
fully manifested in money market fund yields, further dividend increases in our
Money Market Portfolios likely lie in prospect.

* IN SUMMARY
In my Chairman's letter to you one year ago, I noted that "it is hard to
imagine that the steady trend toward ever-lower interest rates can go much
further." I went on to caution that if rates did reverse their decline in
response to a strengthening economy, the capital rewards enjoyed by our
longer-term Portfolios would turn to capital penalties. While I do not presume
any forecasting ability whatsoever, these observations have proved prescient.
Nonetheless, provided that you own the Vanguard Portfolio (or combination of
Portfolios) that meets your long-term risk-reward objectives, I would urge you
to "stay the course" and avoid the temptation to make precipitate changes in
your fund holdings.

        I look forward to reporting on our results for the full 1994 fiscal year
six months hence.

Sincerely,


/S/ JOHN C. BOGLE
- - --------------------------
John C. Bogle
Chairman of the Board

June 17, 1994


<TABLE>
<CAPTION>
                                                             Net Asset Value
                            Total                               Per Share             Dividends        Total Return
                       Net Assets                          -------------------   ------------------   --------------
                       (millions)       Average  Average    Nov. 30,   May 31,     Six       Twelve    Six    Twelve   Current
Portfolio            May 31, 1994      Maturity  Quality*      1993     1994      Months     Months   Months  Months   Yield**
- - ------------------------------------------------------------------------------------------------------------------------------
<S>                        <C>       <C>          <C>       <C>         <C>       <C>         <C>      <C>     <C>       <C>   
MONEY MARKET                                                                                                                 
  CALIFORNIA . . . . . .   $1,126       35 days   MIG 1     $ 1.00      $ 1.00    $ .011      $.023    +1.1%   +2.3%     2.55% 
  PENNSYLVANIA   . . . .    1,041       37 days   MIG 1       1.00        1.00      .011       .023    +1.1    +2.3      2.60 
  NEW JERSEY   . . . . .      803       41 days   MIG 1       1.00        1.00      .011       .022    +1.1    +2.2      2.46 
  OHIO . . . . . . . . .      139       47 days   MIG 1       1.00        1.00      .011       .023    +1.2    +2.3      2.57 
- - ------------------------------------------------------------------------------------------------------------------------------
INSURED LONG-TERM                                                                                                            
  CALIFORNIA . . . . . .   $  929    12.9 years     Aaa     $11.30      $10.66    $ .451+     $.753+   -1.8%   +1.9%     5.58%
  CALIFORNIA                                                                                                                  
   INTERMEDIATE-TERM . .       57     5.3 years     Aaa        --        10.04      .101++      --     +1.4++   --       4.82 
NEW YORK . . . . . . . .      760    11.8 years     Aaa      10.97       10.49      .306+      .602+   -1.6    +2.2      5.41 
PENNSYLVANIA . . . . . .    1,430    11.7 years     Aaa      11.36       10.85      .388+      .703+   -1.1    +3.3      5.47 
NEW JERSEY . . . . . . .      700    11.5 years     Aaa      11.77       11.18      .374+      .690+   -1.9    +1.9      5.41 
OHIO . . . . . . . . . .      162     9.7 years     Aaa      11.61       11.08      .327+      .630+   -1.8    +2.4      5.48 
FLORIDA  . . . . . . . .      292    12.1 years     Aaa      10.86       10.38      .339+      .611+   -1.3    +2.9      5.39 
- - ------------------------------------------------------------------------------------------------------------------------------
</TABLE>
 * MIG 1 and Aaa are Moody's highest ratings for, respectively,
   short-term and long-term municipal bonds.
** Money Market Portfolios' yields are 7-day annualized yields;
   others are 30-day SEC yields.
 + Include capital gains distributions of $.152 for California,
   $.012 for New York, $.079 for Pennsylvania, $.063 for New
   Jersey, $.032 for Ohio, and $.070 for Florida.
++ Since inception, March 4, 1994.
   The shares of each of the Vanguard "single state" Portfolios are available
   for purchase solely by residents of the designated states.

                                       2
<PAGE>   3


AVERAGE ANNUAL TOTAL RETURNS

THE CURRENT YIELDS NOTED IN THE CHAIRMAN'S LETTER ARE CALCULATED IN ACCORDANCE
WITH SEC GUIDELINES. THE AVERAGE ANNUAL TOTAL RETURNS FOR THE PORTFOLIOS
(PERIODS ENDED MARCH 31, 1994) ARE AS FOLLOWS:

<TABLE>
<CAPTION>
                                                  INCEPTION                                         SINCE
PORTFOLIO                                           DATE            1 YEAR        5 YEARS         INCEPTION
- - ------------------------------------              ---------         ------        -------         ---------
<S>                                               <C>               <C>            <C>              <C>
CALIFORNIA INSURED LONG-TERM                       4/7/86           +1.77%         +8.56%           +7.70%
CALIFORNIA INSURED INTERMEDIATE-TERM               3/4/94             --             --             -0.64
CALIFORNIA MONEY MARKET                            6/1/87           +2.34          +4.05            +4.34
NEW YORK INSURED TAX-FREE                          4/7/86           +2.37          +8.97            +7.23
PENNSYLVANIA INSURED LONG-TERM                     4/7/86           +3.14          +9.22            +8.11
PENNSYLVANIA MONEY MARKET                         6/13/88           +2.31          +4.15            +4.39
NEW JERSEY INSURED LONG-TERM                       2/3/88           +2.44          +8.87            +8.65
NEW JERSEY MONEY MARKET                            2/3/88           +2.24          +4.12            +4.37
OHIO INSURED LONG-TERM                            6/18/90           +2.70            --             +9.12
OHIO MONEY MARKET                                 6/18/90           +2.31            --             +3.54
FLORIDA INSURED TAX-FREE                           9/1/92           +2.56            --             +7.01
</TABLE>

THESE DATA REPRESENT PAST PERFORMANCE. THE INVESTMENT RETURN AND PRINCIPAL
VALUE OF AN INVESTMENT WILL FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN
REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR ORIGINAL COST.

PLEASE NOTE THAT AN INVESTMENT IN A MONEY MARKET FUND, SUCH AS A MONEY MARKET
PORTFOLIO OF THE VANGUARD STATE TAX-FREE FUNDS, IS NEITHER INSURED NOR
GUARANTEED BY THE U.S. GOVERNMENT, AND THERE IS NO ASSURANCE THAT THE FUND WILL
BE ABLE TO MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE.



                                       3
<PAGE>   4
REPORT FROM THE INVESTMENT ADVISER

STATE INSURED
LONG-TERM PORTFOLIOS

Over the past six months, the pace of domestic economic activity accelerated
sharply. Strong improvements in the rate of growth in Gross Domestic Product
(GDP), and a host of related statistics such as home sales, automobile sales,
and consumer confidence, provided ample evidence of renewed vigor. Bond markets
seldom react well to strong economic signals and this period was no exception.
The yield on the 30-year Treasury bond rose 1.1 percentage points (from 6.3% to
7.4%). During the same period, municipal bonds performed slightly better, with
the yield on long-term high-grades rising 0.6% (from 5.5% to 6.1%), producing
an 8.3% loss of value.

            As one would expect, the sharp rise in interest rates negatively
impacted the share price of the State Insured Long-Term Portfolios. To be sure,
a decline of this nature can be disconcerting to even the most resolute
long-term investor. However, following more than a decade of exceptional
returns of longer-term fixed-income assets, the poor six-month period
represents only a partial "give back" of previous prosperity. Looking beyond
the short-term share price volatility, a shareholder of the State Insured
Long-Term Portfolios can expect to receive an attractive, consistent, and
durable stream of tax-exempt dividend income.

* SUCCESSFUL STRATEGIES . . .
For the recent period, two of several core strategies stand out for enhancing
the relative returns of the State Insured Long-Term Portfolios.  First, a
reduction in average maturity over the past year improved relative market
performance and moderated some of the "sting" of a bear market. Some of this
was accomplished by focusing on municipals maturing in 15 to 20 years, rather
than the slightly higher yielding but more volatile 30-year maturities. This
modest reduction in average maturity effectively "locked-in" a portion of the
gains in share price achieved in the previous bull market.

            Second, the prudent maintenance of reserve positions of about 10%
of fund assets added to our relative stability. What is more, these reserves
provided a liquidity cushion to meet shareholder redemptions. In good times,
reserves (which normally yield less than longer-term assets) forego a small
amount of yield potential. In difficult market conditions, such as prevailed
during the past six months, the additional reserves allow the portfolio to meet
redemption requests without the inopportune (and sometimes "distressed") sale
of securities.

* LOOKING FORWARD . . .
The issuance of new municipal bonds has fallen dramatically. Issuance for the
first six months in fiscal 1994 was 26% below the pace of a year earlier. Early
indications show forward supply even lower compared to the "mad dash" of 1993.
Municipalities appear to have completed the process of refinancing older,
higher coupon debt of the 1980's and early 1990's. At the same time, a record
number of previously mentioned high coupon bonds are approaching their call
dates, and a huge amount of principal will be returned to owners of individual
bonds. All things being equal, this should continue to provide more attractive
returns for municipal bonds than their taxable brethren.

            In conclusion, it would be reassuring to believe that the recent
increase in interest rates is sufficient to "rein in" the rapidly expanding
U.S. economy and dampen any inflationary expectations. Yet, that observation
might be premature. If history serves as any guide, the process may take longer
than the recent six months of "pain." If so, there could be more share price
unpleasantness ahead before the markets resume their positive return pattern of
the past decade. However, attempting to "time" the turnaround--getting out at
the highs and then getting back in at the lows--tends to be equally futile for
the institutional and individual investor alike. The best advice we know is to
endure the swings and allow the powerful tax exempt compounding of interest to
continue.


                                       4
<PAGE>   5
STATE MONEY MARKET PORTFOLIOS

The past six months ushered in a change in the Federal Reserve Board's
previously accommodative monetary policy. Since February 4, 1994, market
participants watched anxiously as the Federal Reserve Board, in four separate
instances, pushed the Federal funds rate up 125 basis points (1.25%) to 4.25%
and tightened the discount rate 50 basis points (0.50%) to 3.50%. This series
of moves by the Fed has signaled the end of stimulative policy (maintained
throughout 1993) and the initiation of a policy of "neutrality."

            The effect of the tightening on the short-term municipal market was
surprisingly mild. While yields on "first tier" taxable money market funds rose
approximately 70 basis points over the six-month period, yields on
state-specific and general purpose tax-free money funds rose a mere 35 basis
points. The primary contributor to the unresponsive municipal market was the
scarcity of new issue supply. Supply of short-term municipal securities is
quite cyclical, and depends on an issuer's fiscal year, which generally runs
from July 1 to June 30. As a result, supply typically remains light in the
months leading up to June and dramatically increases in the summer months, as
issuers prepare to fund their upcoming budgetary needs in the new fiscal year.
This lack of supply experienced during a period of rising rates in the broader
taxable markets enabled short-term municipal yields to maintain relative
stability. As technical supply factors temporarily have been depressing yields
on short-term municipal securities, we have been targeting a low average
weighted maturity for the tax-exempt money funds of 45 to 60 days. Our
Portfolios should be commensurately more responsive when new issue supply
surges and interest rates rise. We expect the shift from scarcity to abundance
will occur within weeks.

            While the market focused on an accelerating economy and the rise in
interest rates, the Securities and Exchange Commission quietly launched its own
initiative to ensure the net asset value safety of tax-exempt money funds,
consistent with those already applicable to taxable money funds. In fact, the
SEC has proposed regulations that coincide with (or in some cases are less
restrictive than) our conservative approach to managing money market funds.
Thus, they will have little impact on the Vanguard Money Market Portfolios. We
believe that the Commission's proposals, if adopted, will be a positive force
in elevating industrywide portfolio standards.

            In conclusion, the upcoming months could potentially bring about
significant regulatory and economic changes in our market. While keeping a
watchful eye on the actions of the Federal Reserve Board and maintaining our
conservative investment approach, we look forward to capitalizing on any
opportunities that may result.

Sincerely,

Ian A. MacKinnon
Senior Vice President

Jerome J. Jacobs
Vice President

Pamela E. Wisehaupt
Vice President

David E. Hamlin
Assistant Vice President

Reid O. Smith
Assistant Vice President

Danine A. Mueller
Portfolio Manager

Vanguard Fixed Income Group
  
June 13, 1994


                                       5
<PAGE>   6
STATEMENT OF NET ASSETS                    FINANCIAL STATEMENTS (unaudited)
                                                               May 31, 1994

<TABLE>
<CAPTION>
                                           Face                  Market
                                         Amount                   Value
INSURED LONG-TERM PORTFOLIO               (000)                  (000)+
- - -----------------------------------------------------------------------
<S>                                      <C>                    <C>
MUNICIPAL BONDS (97.8%)
- - -----------------------------------------------------------------------
ISSUER INSURED (86.3%)
   Akron Bath & Copley Joint Township
      (Children's Hosp. Medical Center)
      5.50%, 1/1/08 (2)                  $1,000                 $   988
   Akron Water System Rev.
      6.00%, 3/1/14 (3)                   1,000                     990
   Allen County GO
      5.30%, 12/1/15 (2)                  1,250                   1,127
   Bedford Heights GO
      5.65%, 12/1/14 (2)                    500                     481
   Big Walnut Local School Dist. GO
      5.70%, 6/1/14 (2)                   1,000                     963
   Butler County Sewer System
      6.25%, 12/1/12 (2)                  2,925                   2,984
   City of Canton GO
      5.375%, 12/1/07 (2)                 1,000                     981
   Chillicothe GO
      6.05%, 12/1/12 (2)                    675                     686
   Clermont County
      (Mercy Health System)
      5.40%, 9/1/05 (2)                   2,500                   2,458
      5.50%, 9/1/06 (2)                   2,500                   2,456
   Cleveland Airport System Rev.
      7.25%, 1/1/20 (1)                     750                     817
   Cleveland GO
      5.30%, 9/1/08 (2)                   4,500                   4,355
      5.375%, 9/1/09 (2)                  2,000                   1,926
      5.375%, 9/1/10 (2)                  1,000                     953
      5.375%, 9/1/12 (2)                  1,000                     939
   Cleveland School Dist. GO
      0.00%, 12/1/05 (3)                    700                     358
      0.00%, 12/1/06 (3)                    700                     333
      0.00%, 12/1/07 (3)                    500                     223
      0.00%, 12/1/08 (3)                    400                     166
      5.875%, 12/1/11 (3)                 1,500                   1,488
   Cleveland Water Works Rev.
      5.50%, 1/1/13 (1)                   2,125                   2,009
      6.25%, 1/1/15 (2)                   4,500                   4,574
      5.50%, 1/1/21 (1)                   1,500                   1,386
   Columbus City School Dist.
      7.00%, 12/1/00 (3) (Prere.)         1,750                   1,958
   Cuyahoga County Hosp. Rev.
      (Metro Health System)
      6.00%, 2/15/19 (1)                  1,000                     980
      (Univ. Hosp. Health System)
      6.875%, 1/15/19 (6)                 1,825                   1,904
   Dayton Water System Rev.
      6.75%, 12/1/10 (1)                  1,000                   1,059
   Delaware County GO
      5.20%, 12/1/16 (3)                  2,200                   1,957
   Delaware Ohio Sewer System
      5.95%, 11/15/12 (2)                 1,500                   1,506
   Dublin School Dist. GO
      0.00%, 12/1/05 (3)                  1,220                     624
      0.00%, 12/1/06 (3)                  1,220                     581
   Fairfield County Hosp.
      5.375%, 6/15/15 (1)                 3,000                   2,734
      5.50%, 6/15/21 (1)                  1,000                     910
   Franklin County Convention
      Center Rev.
      7.00%, 12/1/00 (1) (Prere.)           675                     756
      0.00%, 12/1/07 (1)                  4,355                   1,931
   Franklin County Hosp. Facilities Rev.
      (Riverside United Methodist)
      7.25%, 5/15/20 (1)                    750                     821
   Hamilton County
      (Children's Hosp.)
      5.20%, 5/15/09 (1)                  2,000                   1,877
   Hamilton County Sewer System
      5.40%, 12/1/08 (3)                  5,700                   5,544
      5.45%, 12/1/09 (3)                  3,250                   3,138
      5.25%, 12/1/16 (3)                  2,000                   1,788
   Hamilton Gas System Rev.
      5.15%, 10/15/13 (1)                 2,750                   2,478
   Hamilton Water System Rev.
      6.30%, 10/15/21 (1)                 2,000                   2,034
   Hilliard County School Dist. GO
      6.55%, 12/1/05 (3)                    500                     546
   Kettering City GO
      5.30%, 12/1/14 (3)                  1,350                   1,226
   Lakota GO
      7.00%, 12/1/09 (2)                  1,740                   1,950
   Lima Sewer Rev.
      6.30%, 12/1/12 (2)                  5,000                   5,127
   Lima Water Rev.
      6.30%, 12/1/12 (2)                  3,400                   3,487
   Lisbon School Dist.
      6.25%, 12/1/17 (2)                  1,500                   1,520
   Lucas County GO
      6.95%, 12/1/11 (1)                  1,800                   1,931
   Mahoning County Hosp.
      Improvement Project (YHA Inc.)
      6.50%, 10/15/14 (1)                 2,500                   2,579
   Marietta City School Dist.
      5.75%, 12/1/07 (2)                  1,500                   1,509
   Marysville GO
      5.55%, 12/1/13 (2)                  1,400                   1,325
   Marysville Water System
      7.05%, 12/1/21 (1)                  1,250                   1,354
   Medina City School Dist. GO
      6.20%, 12/1/18 (3)                  2,100                   2,114
</TABLE>


                                       6
<PAGE>   7

<TABLE>
<CAPTION>
                                           Face                  Market
                                         Amount                   Value
                                          (000)                  (000)+
- - -----------------------------------------------------------------------
<S>                                      <C>                    <C>

   Montgomery County
      (Sisters of Charity)
      6.625%, 5/15/21 (1)                $1,500                  $1,551
   Montgomery County Sewer System
      5.60%, 9/1/11 (3)                   1,000                     962
   Mount Vernon Sewer System
      6.00%, 12/1/12 (2)                    750                     749
   New Philadelphia City School Dist.
      6.25%, 12/1/17 (2)                  2,400                   2,443
   Newark Water System GO
      6.00%, 12/1/18 (2)                  1,250                   1,239
   Northeast Ohio Sewer Dist.
      6.50%, 11/15/16 (2)                 2,500                   2,578
   Ohio Air Quality Development
      Auth. PCR
      5.45%, 1/1/24 (1)                   4,000                   3,585
      (Ohio Edison)
      7.45%, 3/1/16 (3)                     500                     553
      7.10%, 6/1/18 (3)                   1,000                   1,081
   Ohio Building Auth.
      (Transportation Facilities)
      7.00%, 9/1/07 (1)                     850                     924
   Ohio Higher Education Facilities
      (Univ. of Dayton)
      6.75%, 12/1/15 (3)                  1,000                   1,062
      6.60%, 12/1/17 (3)                  1,000                   1,045
   Ohio Univ.
      5.00%, 12/1/13 (3)                  2,000                   1,774
   Ohio Water Development Auth.
      5.50%, 12/1/11 (2)                  1,000                     946
   Olentangy School Dist. GO
      6.35%, 12/1/17 (1)                    500                     510
   Omega Municipal Electric
      5.375%, 2/15/13 (2)                 2,000                   1,852
   Ottowa GO
      7.00%, 9/1/11 (2)                   1,500                   1,623
   Oxford Water Supply System
      6.00%, 12/1/14 (2)                  1,000                     999
   Pickerington GO
      5.80%, 12/1/09 (3)                    500                     501
   Pickerington Local School Dist.
      3.20%, 12/1/94 (2)                    780                     778
      7.00%, 12/1/00 (2) (Prere.)         1,500                   1,679
   Revere School Dist. GO
      6.00%, 12/1/16 (2)                  1,600                   1,590
   Reynoldsburg School Dist. GO
      6.55%, 12/1/17 (3)                  1,600                   1,659
   Springfield GO
      6.875%, 9/1/10 (2)                  1,000                   1,068
   Summit County GO
      6.90%, 8/1/12 (2)                   2,500                   2,669
   Trumbull County
      (Trumbull Memorial Hosp.)
      6.25%, 11/15/12 (3)                 2,000                   2,033
   Trumbull County GO
      5.30%, 12/1/14 (2)                  1,500                   1,370
   Univ. of Cincinnati COP
      2.70%, 6/1/94 (1)                     845                     845
   Univ. of Toledo
      5.75%, 12/1/12 (3)                  1,000                     974
   Wilmington School Dist. GO
      6.30%, 12/1/14 (3)                    500                     509
   Wood County Justice Center GO
      5.95%, 12/1/07 (2)                  1,750                   1,794
   Wooster City School Dist. GO
      6.50%, 12/1/17 (2)                  3,000                   3,101
   Youngstown GO
      6.125%, 12/1/14 (1)                   300                     302
   OUTSIDE OHIO:
   Puerto Rico Public Building
      Auth. Rev.
      0.00%, 7/1/01 (3)                     850                     586
                                                                -------
      GROUP TOTAL                                               139,823
                                                                -------
- - -----------------------------------------------------------------------
SECONDARY MARKET INSURED (1.3%)
   Franklin (Mount Carmel Health)
    6.75%, 6/1/19 (1)                     2,000                   2,084
                                                                -------
- - -----------------------------------------------------------------------
NON-INSURED (10.2%)
   Cincinnati GO
    6.70%, 12/1/94                          400                     406
   Columbus Electric VRDO
    2.90%, 6/1/94                           300                     300
   Hamilton County BAN
    3.25%, 4/14/95                        2,000                   1,992
   Ohio Air Quality
    Development Auth. VRDO
    2.85%, 6/1/94                         1,300                   1,300
   Ohio GO
    7.625%, 8/1/10                        3,510                   4,139
   Ohio Higher Education
    Facilities Auth.
    (Case Western Reserve Univ.)
    6.50%, 10/1/20                          250                     263
    (Oberlin College)
    5.375%, 10/1/15                       1,500                   1,361
   Ohio State Univ. VRDO
    2.85%, 6/1/94                           200                     200
   Ohio Student Loan VRDO
    2.80%, 7/1/94                         4,400                   4,400
   Ohio Water Development
    Auth. VRDO
    (Timpkin Co.)
    2.65%, 6/1/94                         1,300                   1,300

</TABLE>

                                       7

<PAGE>   8
STATEMENT OF NET ASSETS (continued)

<TABLE>
<CAPTION>
                                           Face                  Market
                                         Amount                   Value
                                          (000)                  (000)+
- - -----------------------------------------------------------------------
<S>                                        <C>                 <C>

   Scioto County VRDO
    (Norfolk Southern Corp.)
    2.90%, 6/1/94                          $100                $    100
OUTSIDE OHIO:
   Puerto Rico Development
    Bank VRDO
    2.60%, 6/1/94                           700                     700
                                                               --------
        GROUP TOTAL                                              16,461
                                                               --------
- - -----------------------------------------------------------------------
TOTAL MUNICIPAL BONDS 
   (Cost $157,792)                                              158,368
- - -----------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (2.2%)
   Other Assets--Note B                                           5,020
   Liabilities                                                   (1,437)
                                                               --------
                                                                  3,583
- - -----------------------------------------------------------------------
  NET ASSETS (100%)
- - -----------------------------------------------------------------------
   Applicable to 14,619,130 outstanding
    shares of beneficial interest
    (unlimited authorization--no par value)                    $161,951
- - -----------------------------------------------------------------------
   NET ASSET VALUE PER SHARE                                     $11.08
=======================================================================
</TABLE>

+See Note A to Financial Statements.
For explanations of abbreviations and other references, see
page 9.


<TABLE>
<CAPTION>
- - -----------------------------------------------------------------------
AT MAY 31, 1994, NET ASSETS CONSISTED OF:
- - -----------------------------------------------------------------------
                                         Amount                     Per
                                          (000)                   Share
                                       --------                  ------
<S>                                    <C>                       <C>
 Paid in Capital                       $159,741                  $10.93
 Undistributed Net Investment
   Income                                    --                      --
 Accumulated Net Realized Gains             762                     .05
 Unrealized Appreciation of
   Investments--Note D                    1,448                     .10
- - -----------------------------------------------------------------------
  NET ASSETS                           $161,951                  $11.08
- - -----------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
                                           Face                  Market
                                          Amount                  Value
MONEY MARKET PORTFOLIO                     (000)                 (000)+
- - -----------------------------------------------------------------------
MUNICIPAL BONDS (96.6%)
- - -----------------------------------------------------------------------
<S>                                    <C>                     <C>
   City of Akron Sewer GO BAN
    2.80%, 6/15/94                     $  3,500                $  3,500
   Cleveland--Cuyahoga County Port
    Auth. VRDO
    (Rock & Roll Hall of Fame)
    3.05%, 6/1/94                         5,000                   5,000
    Cleveland School Dist. TRAN
    4.50%, 12/30/94                       5,000                   5,040
   Cleveland School RAN
    9.00%, 6/1/94                         2,000                   2,000
   Cleveland Waterworks
    Improvement VRDO
    2.95%, 6/2/94 (1)                     2,000                   2,000
   Columbus Electric TOB VRDO
    2.90%, 6/1/94                         4,840                   4,840
   Cuyahoga County Hosp.
    Improvement Rev. VRDO
    (St. Luke's Hosp.)
    2.95%, 6/1/94                        10,800                  10,800
   Cuyahoga GO
    2.75%, 10/1/94                        2,040                   2,041
   Euclid City BAN
    2.58%, 9/29/94                        1,100                   1,101
   Franklin County BAN
    3.00%, 8/30/94                        6,400                   6,405
   Hamilton County Metropolitan
    Sewer TOB VRDO
    2.95%, 6/2/94 (3)                     3,000                   3,000
   Lake County Water & Sewer BAN
    2.93%, 10/13/94                       1,700                   1,701
   Montgomery County BAN
    4.00%, 10/27/94                       5,955                   5,976
   North Royalton School Dist.
    Improvement BAN
    3.70%, 9/29/94                        3,000                   3,003
   Ohio Air Quality Development Auth.
    (Cincinnati G&E)
    PCR CP 2.70%, 6/10/94                 5,800                   5,800
    PCR CP 2.75%, 6/10/94                 7,200                   7,200
    (Mead Corp.)
    VRDO 2.85%, 6/1/94                    4,100                   4,100
   Ohio GO
    TOB VRDO 2.95%, 6/2/94                2,080                   2,080
    6.50%, 8/1/94                         1,580                   1,590
   Ohio Higher Education
    Facilities TOB VRDO
    2.89%, 6/2/94 (2)                     1,900                   1,900
   Ohio State Univ. VRDO
    2.85%, 6/2/94                         5,650                   5,650
</TABLE>

                                       8


<PAGE>   9
<TABLE>
<CAPTION>
                                               Face              Market
                                             Amount               Value
                                              (000)              (000)+
- - -----------------------------------------------------------------------
<S>                                        <C>                 <C>
   Ohio Water Development
    Auth. TOB VRDO
    2.95%, 6/2/94 (2)                      $  5,320            $  5,320
    (Mead Corp.)
    VRDO 2.85%, 6/1/94                        5,620               5,620
    (Timpken)
    VRDO 2.65%, 6/1/94                        3,100               3,100
   Scioto County VRDO
    (Norfolk Southern Corp.)
    2.90%, 6/1/94                             6,700               6,700
   Ohio Student Loan VRDO
    2.80%, 6/1/94                            12,500              12,500
   Univ. of Cincinnati
    COP 2.70%, 6/1/94 (1)                     2,600               2,600
    BAN 3.02%, 9/1/94                         8,800               8,806
    BAN 4.00%, 3/23/95                        2,300               2,314
   Warren County Water System
    GO Notes
    3.35%, 9/23/94                            2,600               2,602
- - -----------------------------------------------------------------------
TOTAL MUNICIPAL BONDS 
    (Cost $134,289)                                             134,289
- - -----------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (3.4%)
- - -----------------------------------------------------------------------
   Other Assets--Note B                                           8,492
   Liabilities                                                   (3,783)
                                                               --------
                                                                  4,709
- - -----------------------------------------------------------------------
NET ASSETS (100%)
- - -----------------------------------------------------------------------
   Applicable to 138,997,154 outstanding
    shares of beneficial interest
    (unlimited authorization--no par value)                    $138,998
- - -----------------------------------------------------------------------
NET ASSET VALUE PER SHARE                                         $1.00
=======================================================================
</TABLE>

+ See Note A to Financial Statements.

<TABLE>
<CAPTION>
- - -----------------------------------------------------------------------
AT MAY 31, 1994, NET ASSETS CONSISTED OF:
- - -----------------------------------------------------------------------
                                             Amount                 Per
                                              (000)               Share
                                           --------               -----
<S>                                        <C>                    <C>
  Paid in Capital                          $139,001               $1.00
    Undistributed Net Investment
    Income                                       --                  --
  Accumulated Net Realized Losses                (3)                 --
  Unrealized Appreciation of
    Investments                                  --                  --
- - -----------------------------------------------------------------------
NET ASSETS                                 $138,998               $1.00
- - -----------------------------------------------------------------------
</TABLE>

(1) MBIA (Municipal Bond Insurance Association)
(2) AMBAC (AMBAC Indemnity Corporation)
(3) FGIC (Financial Guaranty Insurance Company)
(4) FSA (Financial Security Assurance)
(5) CGI (Capital Guaranty Insurance)
(6) BIGI (Bond Investors Guaranty Insurance Company)
(7) Connie Lee Inc.
(8) FHA (Federal Housing Authority)
BAN--Bond Anticipation Note
COP--Certificate of Participation
CP --Commercial Paper
GO --General Obligation
IDR--Industrial Development Revenue
PCR--Pollution Control Revenue
RAN--Revenue Anticipation Note
TAN--Tax Anticipation Note
TOB--Tender Option Bond
TRAN--Tax Revenue Anticipation Note
VRDO--Variable Rate Demand Obligation
(ETM)--Escrowed to Maturity
(Prere.)--Prerefunded
*Put Option Obligation.


                                       9
<PAGE>   10
STATEMENT OF OPERATIONS


<TABLE>
<CAPTION>
                                                                               INSURED                        MONEY
                                                                    LONG-TERM PORTFOLIO            MARKET PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                                       Six Months Ended            Six Months Ended
                                                                           May 31, 1994                May 31, 1994
                                                                                  (000)                       (000)
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                                 <C>         <C>            <C>          <C>
INVESTMENT INCOME                                                              
  INCOME                                                                       
    Interest  . . . . . . . . . . . . . . . . . . . . . . . . .                  $4,569                     $1,687
- - -------------------------------------------------------------------------------------------------------------------
      Total Income  . . . . . . . . . . . . . . . . . . . . . .                   4,569                      1,687
- - -------------------------------------------------------------------------------------------------------------------
  EXPENSES
    The Vanguard Group--Note B
      Investment Advisory Services  . . . . . . . . . . . . . .     $   9                      $   7
      Management and Administrative . . . . . . . . . . . . . .       142                        112
      Marketing and Distribution  . . . . . . . . . . . . . . .        21           172           18           137
                                                                    -----                      -----
    Auditing Fees . . . . . . . . . . . . . . . . . . . . . . .                       4                          4
    Shareholders' Reports . . . . . . . . . . . . . . . . . . .                      19                         11
    Annual Meeting and Proxy Costs  . . . . . . . . . . . . . .                       1                          4
- - -------------------------------------------------------------------------------------------------------------------
      Total Expenses  . . . . . . . . . . . . . . . . . . . . .                     196                        156
- - -------------------------------------------------------------------------------------------------------------------
        Net Investment Income   . . . . . . . . . . . . . . . .                   4,373                      1,531
- - -------------------------------------------------------------------------------------------------------------------
REALIZED NET GAIN
    Investment Securities Sold  . . . . . . . . . . . . . . . .                     687                         --
    Futures Contracts . . . . . . . . . . . . . . . . . . . . .                     793                         --
- - -------------------------------------------------------------------------------------------------------------------
      Realized Net Gain   . . . . . . . . . . . . . . . . . . .                   1,480                         --
- - -------------------------------------------------------------------------------------------------------------------
CHANGE IN UNREALIZED APPRECIATION
  (DEPRECIATION)
    Investment Securities . . . . . . . . . . . . . . . . . . .                  (9,918)                        --
    Futures Contracts . . . . . . . . . . . . . . . . . . . . .                     734                         --
- - -------------------------------------------------------------------------------------------------------------------
      Change in Unrealized Appreciation (Depreciation)  . . . .                  (9,184)                        --
- - -------------------------------------------------------------------------------------------------------------------
      Net Increase (Decrease) in Net Assets Resulting
        from Operations . . . . . . . . . . . . . . . . . . . .                 $(3,331)                    $1,531
===================================================================================================================
</TABLE>


                                      10


<PAGE>   11
STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                          INSURED                             MONEY
                                                              LONG-TERM PORTFOLIO                  MARKET PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                      SIX MONTHS       Year Ended       SIX MONTHS       Year Ended
                                                           ENDED     November 30,            ENDED     November 30,
                                                    MAY 31, 1994             1993     MAY 31, 1994             1993
                                                           (000)            (000)            (000)            (000)
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>              <C>              <C>              <C>
INCREASE (DECREASE) IN NET ASSETS
OPERATIONS
  Net Investment Income . . . . . . . . . . . . . . .   $  4,373         $  7,319         $  1,531         $  2,551
  Realized Net Gain (Loss)  . . . . . . . . . . . . .      1,480              (82)              --               (3)
  Change in Unrealized Appreciation
    (Depreciation)  . . . . . . . . . . . . . . . . .     (9,184)           7,265               --               --
- - -------------------------------------------------------------------------------------------------------------------
      Net Increase (Decrease) in Net Assets
        Resulting from Operations . . . . . . . . . .     (3,331)          14,502            1,531            2,548
- - -------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS (1)
  Net Investment Income . . . . . . . . . . . . . . .     (4,373)          (7,319)          (1,531)          (2,551)
  Realized Net Gain . . . . . . . . . . . . . . . . .       (463)          (1,350)              --               --
- - -------------------------------------------------------------------------------------------------------------------
      Total Distributions . . . . . . . . . . . . . .     (4,836)          (8,669)          (1,531)          (2,551)
- - -------------------------------------------------------------------------------------------------------------------
CAPITAL SHARE TRANSACTIONS (2)
  Issued     -- Regular . . . . . . . . . . . . . . .     22,420           66,822           53,030          106,837
             -- In Lieu of Cash Distributions . . . .      3,633            6,863            1,422            2,389
             -- Exchange. . . . . . . . . . . . . . .     10,758           22,533           23,830           30,312
  Redeemed   -- Regular . . . . . . . . . . . . . . .    (16,662)         (17,048)         (51,300)         (68,436)
             -- Exchange. . . . . . . . . . . . . . .    (16,507)         (19,131)         (19,586)         (31,681)
- - -------------------------------------------------------------------------------------------------------------------
      Net Increase from
        Capital Share Transactions  . . . . . . . . .      3,642           60,039            7,396           39,421
- - -------------------------------------------------------------------------------------------------------------------
      Total Increase (Decrease) . . . . . . . . . . .     (4,525)          65,872            7,396           39,418
- - -------------------------------------------------------------------------------------------------------------------
NET ASSETS
  Beginning of Period . . . . . . . . . . . . . . . .    166,476          100,604          131,602           92,184
- - -------------------------------------------------------------------------------------------------------------------
  End of Period . . . . . . . . . . . . . . . . . . .   $161,951         $166,476         $138,998         $131,602
===================================================================================================================
  (1) Distributions Per Share
      Net Investment Income . . . . . . . . . . . . .      $.295            $.608            $.011            $.023
      Realized Net Gain . . . . . . . . . . . . . . .      $.032            $.145               --               --
- - -------------------------------------------------------------------------------------------------------------------
  (2) Shares Issued and Redeemed
      Issued  . . . . . . . . . . . . . . . . . . . .      2,890            7,799           76,860          137,149
      Issued in Lieu of Cash Distributions  . . . . .        319              601            1,422            2,389
      Redeemed  . . . . . . . . . . . . . . . . . . .     (2,930)          (3,149)         (70,886)        (100,117)
- - -------------------------------------------------------------------------------------------------------------------
                                                             279            5,251            7,396           39,421
- - -------------------------------------------------------------------------------------------------------------------
</TABLE>


                                      11

<PAGE>   12
FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                                                       INSURED LONG-TERM PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                      SIX MONTHS           Year Ended November 30,       June 18 to
                                                           ENDED        -----------------------------      Nov. 30,
For a Share Outstanding Throughout Each Period      MAY 31, 1994        1993        1992         1991          1990
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>        <C>         <C>           <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . . . . . .   $11.61      $11.07      $10.60       $10.30        $10.00
                                                          ------      ------      ------       ------        ------
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . . . . . .     .295        .608        .630         .650          .295
  Net Realized and Unrealized Gain (Loss) on Investments   (.498)       .685        .474         .300          .300
                                                          ------      ------      ------       ------        ------
        TOTAL FROM INVESTMENT OPERATIONS  . . . . . . .    (.203)      1.293       1.104         .950          .595
- - -------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . .    (.295)      (.608)      (.630)       (.650)        (.295)
  Distributions from Realized Capital Gains . . . . . .    (.032)      (.145)      (.004)          --            --
                                                          ------      ------      ------       ------        ------
        TOTAL DISTRIBUTIONS . . . . . . . . . . . . . .    (.327)      (.753)      (.634)       (.650)        (.295)
- - -------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . . . . . .   $11.08      $11.61      $11.07       $10.60        $10.30
===================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . . . .   -1.79%     +12.03%     +10.69%       +9.50%        +6.04%
- - -------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions)  . . . . . . . . .     $162        $166        $101          $61           $17
Ratio of Expenses to Average Net Assets . . . . . . . .    .23%*        .21%        .31%         .27%         .22%*
Ratio of Net Investment Income to Average Net Assets  .   5.18%*       5.29%       5.77%        6.20%        6.55%*
Portfolio Turnover Rate . . . . . . . . . . . . . . . .     15%*         10%         27%          20%            2%
- - -------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.



                                       12
<PAGE>   13
<TABLE>
<CAPTION>
                                                                          MONEY MARKET PORTFOLIO
- - -------------------------------------------------------------------------------------------------------------------
                                                      SIX MONTHS           Year Ended November 30,       June 18 to
                                                           ENDED        -----------------------------      Nov. 30,
For a Share Outstanding Throughout Each Period      MAY 31, 1994        1993        1992         1991          1990
- - -------------------------------------------------------------------------------------------------------------------
<S>                                                       <C>         <C>         <C>          <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD  . . . . . . . . .    $1.00       $1.00       $1.00        $1.00         $1.00
                                                           -----       -----       -----        -----         -----
INVESTMENT OPERATIONS
  Net Investment Income . . . . . . . . . . . . . . . .     .011        .023        .030         .045          .027
  Net Realized and Unrealized Gain (Loss) on Investments      --          --          --           --            --
                                                           -----       -----       -----        -----         -----
      TOTAL FROM INVESTMENT OPERATIONS  . . . . . . . .     .011        .023        .030         .045          .027
- - -------------------------------------------------------------------------------------------------------------------
DISTRIBUTIONS
  Dividends from Net Investment Income  . . . . . . . .    (.011)      (.023)      (.030)       (.045)        (.027)
  Distributions from Realized Capital Gains . . . . . .       --          --          --           --            --
                                                           -----       -----       -----        -----         -----
      TOTAL DISTRIBUTIONS . . . . . . . . . . . . . . .    (.011)      (.023)      (.030)       (.045)        (.027)
- - -------------------------------------------------------------------------------------------------------------------
NET ASSET VALUE, END OF PERIOD  . . . . . . . . . . . .    $1.00       $1.00       $1.00        $1.00         $1.00
===================================================================================================================
TOTAL RETURN  . . . . . . . . . . . . . . . . . . . . .   +1.15%      +2.37%      +3.01%       +4.64%        +2.59%
- - -------------------------------------------------------------------------------------------------------------------
RATIOS/SUPPLEMENTAL DATA
- - ------------------------
Net Assets, End of Period (Millions)  . . . . . . . . .     $139        $132         $92          $79           $37
Ratio of Expenses to Average Net Assets . . . . . . . .    .23%*        .21%        .31%         .26%         .23%*
Ratio of Net Investment Income to Average Net Assets. .   2.29%*       2.34%       2.95%        4.45%        5.65%*
Portfolio Turnover Rate . . . . . . . . . . . . . . . .      N/A         N/A         N/A          N/A           N/A
- - -------------------------------------------------------------------------------------------------------------------
</TABLE>
*Annualized.


                                       13

<PAGE>   14
NOTES TO FINANCIAL STATEMENTS

Vanguard Ohio Tax-Free Fund is registered under the Investment Company Act of
1940 as an open-end investment company and consists of the Insured Long-Term
and Money Market Portfolios. Each Portfolio 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 are in conformity with
generally accepted accounting principles for investment companies. Such
policies are consistently followed by the Fund in the preparation of financial
statements.

1.   SECURITY VALUATION: Money Market Portfolio: investment securities
are valued at amortized cost which approximates market value.  Insured
Long-Term Portfolio: municipal bonds are valued utilizing primarily the latest
bid prices or, if bid prices are not available, on the basis of valuations
based on a matrix system (which considers such factors as security prices,
yields, maturities, and ratings), both as furnished by an independent pricing
service.

2.   FEDERAL INCOME TAXES: Each Portfolio of the Fund intends to
continue to qualify as a regulated investment company and distribute all of its
income. Accordingly, no provision for Federal income taxes is required in the
financial statements.

3.   FUTURES: The Insured Long-Term Portfolio utilizes futures contracts
to a limited extent. The primary risks associated with the use of futures
contracts are imperfect correlation between the change in market value of the
bonds held by the Portfolio and the prices of futures contracts, and the
possibility of an illiquid market. Futures contracts are valued based upon
their quoted daily settlement prices.  Fluctuations in the value of futures
contracts are recorded as unrealized appreciation (depreciation) until
terminated at which time realized gains (losses) are recognized. Unrealized
appreciation (depreciation) related to open futures contracts is required to be
treated as realized gain (loss) for Federal income tax purposes.

4.   DISTRIBUTIONS: Distributions from net investment income are
declared on a daily basis payable on the first business day of the following
month. Annual distributions from realized gains, if any, are recorded on the
ex-dividend date. Capital gain distributions are determined on a tax basis and
may differ from realized capital gains for financial reporting purposes due to
differences in the timing of realization of gains.

5.   OTHER: Security transactions are accounted for on the date the
securities are purchased or sold. Costs used in determining realized gains and
losses on the sale of investment securities are those of specific securities
sold. Premiums and original issue discounts are amortized and accreted,
respectively, to interest income over the lives of the respective securities.

* B.  The Vanguard Group, Inc. furnishes at cost investment advisory, corporate
management, administrative, marketing and distribution services.  The costs of
such services are allocated to the Fund under methods approved by the Board of
Trustees. The Fund has contributed capital of $48,000 to Vanguard (included in
Other Assets), representing .2% of Vanguard's capitalization. The Fund's
officers and trustees are also officers and directors of Vanguard.

* C.  During the six months ended May 31, 1994, the Insured Long-Term Portfolio
made purchases of $18,391,000 and sales of $11,636,000 of investment securities
other than temporary cash investments.





                                       14

<PAGE>   15

* D.  At May 31, 1994, unrealized appreciation of investment securities of the
Insured Long-Term Portfolio for financial reporting and Federal income tax
purposes aggregated $576,000, of which $3,709,000 related to appreciated
securities and $3,133,000 related to depreciated securities.

At May 31, 1994, the Insured Long-Term Portfolio had short positions in U.S.
Treasury Bond futures contracts expiring through September 1994, with an
aggregate settlement value and net unrealized appreciation of $19,011,000 and
$872,000, respectively. The market value of securities deposited as initial
margin for open futures contracts was $534,000.





                                       15

<PAGE>   16
                          THE VANGUARD FAMILY OF FUNDS

                               MONEY MARKET FUNDS
                         Vanguard Money Market Reserves

                         TAX-EXEMPT MONEY MARKET FUNDS
              Vanguard Municipal Bond Fund-Money Market Portfolio
                 Vanguard State Tax-Free Funds (CA, NJ, OH, PA)

                            TAX-EXEMPT INCOME FUNDS
                          Vanguard Municipal Bond Fund
             Vanguard State Tax-Free Funds (CA, FL, NJ, NY, OH, PA)

                               FIXED INCOME FUNDS
                             Vanguard Admiral Funds
                            Vanguard Bond Index Fund
                     Vanguard Fixed Income Securities Fund
                         Vanguard Preferred Stock Fund

                                 BALANCED FUNDS
                         Vanguard Asset Allocation Fund
                          Vanguard Balanced Index Fund
                               Vanguard STAR Fund
                         Vanguard/Wellesley Income Fund
                            Vanguard/Wellington Fund

                                  EQUITY FUNDS
                            GROWTH AND INCOME FUNDS
                      Vanguard Convertible Securities Fund
                          Vanguard Equity Income Fund
                              Vanguard Index Trust
                        Vanguard Quantitative Portfolios
                 Vanguard/Trustees' Equity Fund-U.S. Portfolio
                             Vanguard/Windsor Fund
                              Vanguard/Windsor II

                                  GROWTH FUNDS
                          Vanguard/Morgan Growth Fund
                             Vanguard/PRIMECAP Fund
                         Vanguard U.S. Growth Portfolio

                            AGGRESSIVE GROWTH FUNDS
                             Vanguard Explorer Fund
                        Vanguard Specialized Portfolios

                              INTERNATIONAL FUNDS
                    Vanguard International Equity Index Fund
                    Vanguard International Growth Portfolio
             Vanguard/Trustees' Equity Fund-International Portfolio

                 The Vanguard Group * Vanguard Financial Center
                             Valley Forge, PA 19482
                   New Account Information: 1-(800) 662-7447
                 Shareholder Account Services: 1-(800) 662-2739

               This Report has been prepared for shareholders and
                may be distributed to others only if preceded or
             accompanied by a current prospectus. All Funds in the
                Vanguard Family are offered by prospectus only.

                                   Q962-05/94


                                   VANGUARD
                                     OHIO
                                TAX-FREE FUND
                                      
                        [PHOTO -- SEE EDGAR APPENDIX]
                                      
                                      
                              SEMI-ANNUAL REPORT
                              MAY 31, 1994
<PAGE>   17

                                EDGAR APPENDIX

         The back cover of the printed version of this report features the flags
of the United States of America and Vanguard flying from a halyard.



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