OPPENHEIMER MULTI-STATE MUNICIPAL TRUST
N-30D/A, 1999-05-11
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<PAGE>   1
                     SEMMIANNUAL REPORT JANUARY 31, 1999


                                   OPPENHEIMER

                                  PENNSYLVANIA
                                 MUNICIPAL FUND
                                     [PHOTO]

                            [OPPENHEIMERFUNDS LOGO]
                            THE RIGHT WAY TO INVEST


<PAGE>   2

CONTENTS

 3 President's Letter

 5 An Interview with
   Your Fund's
   Managers

12 Financial
   Statements

32 Information and
   Services

REPORT HIGHLIGHTS
- --------------------------------------------------------------------------------

- -  ANTHONY  A.  TANNER,  CFA,  Vice  President  of  OppenheimerFunds'  Rochester
Division, was named Portfolio Manager as of January 1, 1999. Ronald H. Fielding,
CFA,  President  of  OppenheimerFunds'  Rochester  Division,  was also  named as
Portfolio Manager, and will serve as Chief Strategist for the Fund.


<TABLE>
<CAPTION>
                                TOTAL RETURNS(1)
                        (For the periods ended 1/31/99)

                         Cumulative                    Average Annual
                      NAV           MOP                NAV      MOP
<S>                 <C>           <C>               <C>       <C>
A SHARES
1-Year                4.42%        -0.54%             4.42%    -0.54%
5-Year               27.58%        21.51%             4.99%     3.97%
Life (9/18/89)       92.73%        83.59%             7.25%     6.70%

B SHARES
1-Year                3.72%        -1.26%             3.72%    -1.26%
5-Year               22.83%        20.89%             4.20%     3.87%
Life (5/3/93)        32.66%        31.66%             5.04%     4.90%

C SHARES
1-Year                3.72%         2.73%             3.72%     2.73%
Life (8/29/95)       23.36%        23.36%             6.33%     6.33%
</TABLE>

1. Total returns  include  changes in share price and  reinvestment of dividends
and capital gains  distributions  in a  hypothetical  investment for the periods
shown.  MOP stands for Maximum  Offering  Price,  and  calculations  for Class A
returns at MOP  include  the  maximum  initial  sales  charge of 4.75%.  Class B
returns at MOP include the  applicable  contingent  deferred  sales charge of 5%
(1-year) and 1% (5-year).  Class C return includes the contingent deferred sales
charge of 1% (1-year). An explanation of the different performance  calculations
is in the Fund's prospectus. Class B and C shares are subject to an annual 0.75%
asset-based sales charge.

IN REVIEWING  PERFORMANCE AND RANKINGS,  PLEASE  REMEMBER THAT PAST  PERFORMANCE
DOES NOT GUARANTEE FUTURE RESULTS.  INVESTMENT  RETURN AND PRINCIPAL VALUE OF AN
INVESTMENT  IN THE  FUND  WILL  FLUCTUATE  SO THAT AN  INVESTOR'S  SHARES,  WHEN
REDEEMED,  MAY BE WORTH  MORE OR LESS  THAN  THEIR  ORIGINAL  COST.  The  Fund's
performance may from time to time be subject to substantial  short-term changes,
particularly  during periods of market or interest rate volatility.  For updates
on the Fund's  performance,  please contact your financial  advisor,  call us at
1-800-525-7048 or visit our website, www.oppenheimerfunds.com.


                   2 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   3

[PHOTO]
BRIDGET A. MACASKILL
President,
Oppenheimer
Pennsylvania
Municipal Fund

DEAR SHAREHOLDER,

Contrary to what many analysts had expected,  the U.S.  economy  appears to have
picked up steam over the past few months.  The fourth quarter of 1998 posted the
fastest rate of economic growth in two years, and early indications suggest that
the first quarter of 1999 may follow suit.

       With  respect to the U.S.  bond market,  stronger-than-expected  economic
growth has triggered  concerns  that the Federal  Reserve may raise key interest
rates to  forestall  an  acceleration  of  inflation.  As a  result,  yields  of
longer-term  taxable  bonds  have  risen from  their  October  1998  lows,  when
investors had bid up prices  during the global  "flight to quality." At the same
time, tax-exempt bond prices and yields have remained relatively stable.

       In the U.S. stock market, it might appear at first glance that prices are
rising as rapidly as the economy is  growing.  However,  a closer  look  reveals
that,  with the  exception  of large-cap  growth  companies  and the  technology
industry, most stock prices remained relatively flat. What's more, the disparity
in valuations between large companies,  which have led the market's advance, and
smaller ones, which have lagged, has become historically wide.

       What do  these  observations  mean  for your  investments?  In our  view,
actively managed  portfolios that are closely monitored by expert money managers
are likely to provide  better  returns  than  passive  index  investing in 1999.
That's because  selectivity is expected to be more critical to performance  than
it has been over the past few years.  In a potentially  overvalued  stock market
and rising interest-rate environment, the ability to identify the most promising
securities could become paramount.

                   3 Oppenheimer Pennsylvania Municipal Fund



<PAGE>   4


       Even  though  many  equity  investors  may be tempted to jump  aboard the
technology  bandwagon,  we suggest a more prudent course: broad  diversification
beyond any single  asset class,  industry,  capitalization  range or  geographic
region.  We  believe  that the  risks  of this  investment  environment  require
consideration of a broad range of investments and markets, including bonds. That
way,  if one  market  experiences  setbacks,  one or more of the others may help
cushion the effects on your overall portfolio.

       No matter  what the  financial  markets  have in  store,  we  resolve  to
continue  working with your financial  advisor to keep you apprised of potential
risks  and   opportunities.   Providing   you  with  the   market   information,
professionally  managed investments and other resources you need to achieve your
financial  goals is an important  part of our enduring  commitment to you as The
Right Way to Invest.

Sincerely,

/s/ BRIDGET A. MACASKILL

Bridget A. Macaskill
March 10, 1999

                   4 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   5

As of January 31, 1999, the Funds' Class A  distribution  yield of 4.68% is 0.28
basis points more than the median yield of all 62  Pennsylvania  municipal  bond
funds.*


AN INTERVIEW WITH YOUR FUND'S MANAGERS
- --------------------------------------------------------------------------------

HOW HAS OPPENHEIMER  PENNSYLVANIA  MUNICIPAL FUND PERFORMED  DURING THE PAST SIX
MONTH PERIOD THAT ENDED JANUARY 31, 1999?

The Fund's Class A shares  provided an  annualized  tax-free  dividend  yield of
4.68%  (computed  without  sales  charges) as of January 31,  1999.  This is the
equivalent  of 6.97% in taxable yield for a  Pennsylvania  taxpayer in the 32.9%
combined  Pennsylvania  State and federal tax bracket.  For taxpayers subject to
higher federal tax rates, or additional local income taxes, the equivalent yield
would make your Fund investment even more attractive.

WHAT IS THE CURRENT STATE OF THE PENNSYLVANIA MUNICIPAL  BOND MARKET?

The Pennsylvania  economy, and the municipal bond market in general,  appears to
be strengthening.  Most importantly, the State's credit rating has been upgraded
from AA- to AA due to almost five years of budget  surpluses and a 4% surplus in
general  fund  revenues.  In  addition,  the  yield on long  insured  issues  is
currently over 95% of the yield on comparable Treasury  securities,  which makes
municipal bonds unusually attractive. Finally, Pennsylvania does not exhibit the
budget gaps and deficits  prevalent in other  states.  Changing from a primarily
industrial economy in the 1980's to a technical, financial and export economy in
the 1990's,  the State continues to represent  fertile ground for municipal bond
investing.

HOW DO YOU PLAN TO MANAGE THE PORTFOLIO TO TAKE ADVANTAGE OF THESE CONDITIONS?

To make the most of these conditions, our portfolio objectives




*According to Lipper Analytical Services, Inc. Lipper calculations are at Net
Asset Value and do not include sales charges which, if included, would affect
results.

                   5 Oppenheimer Pennsylvania Municipal Fund


<PAGE>   6

[PHOTO]
PORTFOLIO MANAGEMENT TEAM (l to r)
TONY TANNER
Vice President,
Rochester Division;
Portfolio Manager
RON FIELDING
Senior Vice President, OppenheimerFunds, Inc.;
Portfolio Manager and
Chief Strategist

include,  first, a WIDE MIX OF CREDITS.  Currently,  the Pennsylvania  municipal
market  presents many  opportunities  for us to vary the types of credits in the
portfolio.  Diversifying  the portfolio over this range of credit types helps us
to take advantage of growth opportunities while softening the impact of cyclical
declines in other areas.

       We'll also be working  toward an INCREASE IN THE NUMBER OF ISSUES HELD IN
THE FUND. While individual investors may be better advised to own larger issues,
we rely on our own in-house  research to identify  smaller  issues that are more
appropriate  for  an  actively  managed   portfolio.   Although   Pennsylvania's
population is geographically concentrated in a few relatively large metropolitan
areas,  part  of  our  strategy  is to  make  ourselves  known  to  issuers  and
underwriting  firms  throughout the entire State.  Historically  our success has
been based,  in part, on uncovering  opportunities  across the State,  including
smaller,  non-metropolitan  venues.  This  helps  us  to  find  good  values  in
securities that others have  overlooked.  We've long felt that if all we did was
buy the highest-rated,  largest municipal offerings,  we would find it difficult
to justify our management fee.

       Another of our strategies is to accumulate  holdings through purchases of
bonds in small quantities. We are always searching for underappreciated credits.
In the  secondary  market,  these  can  often be found in  amounts  of less than
$100,000. Being highly flexible in our buying gives



                   6 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   7


AN INTERVIEW WITH YOUR FUND'S MANAGERS
- --------------------------------------------------------------------------------

us a better opportunity to maximize yield for our shareholders.  Combining these
purchases in the portfolio  enables us to accumulate  holdings at more favorable
prices, and enhance liquidity.

WHAT KINDS OF PORTFOLIO CHANGES SHOULD SHAREHOLDERS ANTICIPATE?

This year,  shareholders should expect to see some changes in the composition of
the  portfolio's  holdings that more closely  reflect the new managers' views on
how best to maximize tax-free income while maintaining low price volatility.  We
anticipate  building  this  portfolio to include more issues and select  smaller
issues  based on our  traditional  bottom-up  approach.  The  value  that we add
through portfolio management includes the expertise of five full-time investment
professionals and sophisticated recordkeeping--things that most retail investors
can't do themselves.
        The management  strategies that we've used in other municipal bond funds
have  always  led us to seek  out  bonds  that  will  best  enhance  shareholder
dividends.  To keep a pulse on what's coming up in the primary market, we follow
legislative  initiatives  on new  types  of  bond  issuance.  For  example,  the
Pennsylvania  legislature  has  approved a measure  that will  generate new bond
issues to fund stadium construction.  Federal  appropriations for transportation
have been modified,  and could translate into bond  initiatives for mass transit
projects.  In 1998 there was over $15 billion in new issuance of municipal  debt
in  Pennsylvania,  passing the previous  record set in 1993. We anticipate  that
1999 will

                   7 Oppenheimer Pennsylvania Municipal Fund


<PAGE>   8

BROADER  DIVERSIFICATION  AND ACCESS TO SMALLER ISSUERS ARE TWO WAYS AN INVESTOR
CAN BENEFIT THE MOST BY OWNING MUNICIPAL BONDS IN A MUTUAL FUND FORMAT.


bring  a host  of  new  opportunities  in the  higher  education  sector  of the
Pennsylvania municipal bond market, as well.

       To find attractive  opportunities in the secondary  market,  we prefer to
meet  directly  with  issuers to maintain  firsthand  knowledge  of their credit
quality and fiscal situation.  We can supplement this knowledge with information
provided  by  municipal  bond  dealers  and  analysts.  Recently,  we have  been
researching  the prepayment  history of premium  coupon housing bonds.  We don't
anticipate new issuance of many housing bonds in 1999, but our research helps us
to identify good values in previously  issued premium  coupon housing bonds.  We
find the current market for housing bonds to be attractive  because we feel such
bonds provide above-average yield with below-average volatility.

WHAT SPECIFIC CHANGES HAVE YOU MADE SO FAR?

We have already made  strategic  additions  to the  portfolio  that provide high
yield at good value. In making those selections,  we're  emphasizing  income and
broadening of credit  exposure.  These  additions  have included  bonds from the
non-profit sector, and the tax-exempt bonds of investment grade corporate-backed
issuers.  We have purchased small amounts of premium coupon housing bonds, which
we feel provide the opportunity for high yield with low interest-rate risk. When
the most  recent  Annual  Report was  issued,  there were 48  securities  in the
portfolio. By year-end 1999, we expect to include over 100 different securities.

       Broader  diversification  and access to smaller  issuers  are two ways an
investor can benefit the most by owning municipal bonds in a mutual fund format.
In this manner,


                   8 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   9

AN INTERVIEW WITH YOUR FUND'S MANAGERS
- --------------------------------------------------------------------------------

our  shareholders  gain access to the best  securities  we can  unearth  without
placing undue reliance on any single issue.

ARE THERE ANY MARKET SECTORS THAT THE FUND WILL SEEK TO AVOID?

Virtually  all market  sectors go through some  periods that are more  favorable
than others. We try to broaden our portfolios so that weakness in one particular
sector doesn't have an unduly  negative  effect on the portfolio as a whole.  On
the upside, it's possible to uncover good values in a sector that's experiencing
some  turbulence.  This is  where  knowledge  of the  municipal  market  and the
research  component of our management  style can add  significant  value for our
shareholders.

       In Pennsylvania,  Hospital/Healthcare  is one such sector. The bankruptcy
last year of  Allegheny  Health,  Education,  and  Research  Foundation  (AHERF)
hospitals in Philadelphia  had an impact on some, but not all,  hospitals in the
state.  Your  Oppenheimer  Pennsylvania  Municipal Fund did not own any bonds of
AHERF hospitals in Philadelphia.  The market turmoil created by this event leads
us to  believe  that  careful  scrutiny  may  turn up some  valuable  investment
opportunities.

       In the wake of the AHERF bankruptcy,  two hospital issues that are in the
portfolio  were affected in different  ways.  The credit  rating on  Monroeville
Forbes Health System bonds was lowered from A- to B; however,  the  Philadelphia
Jeanes  Hospital  Project  issues in the Fund were  upgraded--from  BBB to BBB+.
These  divergent  outcomes  within the sector have caused  considerable  concern
among  investors;  they also indicate that this is an area where good values can
be found.

                   9 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   10

STANDARDIZED YIELDS(1)

For the 30 Days
Ended 1/31/99

CLASS A    4.24%

CLASS B    3.68%

CLASS C    3.68%

       We're using our research  capabilities to uncover the best ways to profit
from turmoil caused by the AHERF  bankruptcy.  Hospitals can be good investments
for a widely diversified  portfolio--but finding investments that represent good
value  requires  patience,  experience and  commitment.  Although the Healthcare
sector  comprises  19.4% of the  portfolio  as of January  31,  1999,  more than
one-third of that amount is secured by municipal bond insurance or U.S. Treasury
securities,  and is rated AAA. We're monitoring the remainder of the portfolio's
commitment  to this  sector,  and we'll make  adjustments  where we see the best
opportunities for the Fund.



1.  Standardized  Yield is based on net investment  income for the 30-day period
ended  1/31/99.  Falling  share prices will tend to  artificially  raise yields.
Cumulative total returns (not annualized) for the six month period ended 1/31/99
were as follows:  For Class A shares,  3.51% without sales  charges,  and -1.41%
with current  maximum initial sales charge of 4.75%;  For Class B shares,  3.12%
without sales  charges,  -1.88% with the  applicable  contingent  deferred sales
charge of 5%;  For Class C shares,  3.21%  without  sales  charges,  2.21%  with
contingent  deferred  sales  charge  of 1%.  An  explanation  of  the  different
performance  calculations is in the Fund's prospectus.  Class B and C shares are
subject to an annual 0.75% asset-based sales charge.  Performance  without sales
charges  includes  changes in net asset value per share  without  deducting  any
sales charges.  Such performance would have been lower if sales charges had been
taken into account.

                   10 Oppenheimer Pennsylvania Municipal Fund


<PAGE>   11

<TABLE>
<CAPTION>
    AVERAGE ANNUAL TOTAL RETURNS(1)
   (For the periods ended 12/31/98)

                        Average Annual
                       NAV           MOP

<S>                  <C>           <C>
A SHARES
1-Year                4.45%        -0.51%
5-Year                5.10%         4.08%
Life (9/18/89)        7.23%         6.67%

B SHARES
1-Year                3.59%        -1.38%
5-Year                4.31%         3.98%
Life (5/3/93)         4.97%         4.83%

C SHARES
1-Year                3.67%         2.68%
Life (8/29/95)        6.23%         6.23%
</TABLE>

<TABLE>
<CAPTION>
CREDIT ALLOCATION(2)
[PIE CHART]
<S>         <C>
AAA          44.2%
BBB          24.2%
BB           14.8%
A             7.3%
AA            6.0%
B             3.5%
</TABLE>


<TABLE>
<CAPTION>
TOP FIVE SECTORS
Percentage of invested assets(3)
- ----------------------------------------------------------------------------
<S>                                                                  <C>
Hospital/Healthcare                                                   19.4%
- ----------------------------------------------------------------------------
Single Family Housing                                                 15.0%
- ----------------------------------------------------------------------------
General Obligation                                                     9.1%
- ----------------------------------------------------------------------------
Adult Living Facilities                                                8.4%
- ----------------------------------------------------------------------------
Resource Recovery                                                      7.8%
- ----------------------------------------------------------------------------
</TABLE>

1. Total returns  include  changes in share price and  reinvestment of dividends
and capital gains  distributions  in a  hypothetical  investment for the periods
shown.  Class A return  includes  the current  maximum  initial  sales charge of
4.75%. Class B return includes the applicable  contingent  deferred sales charge
of 5% (1-year) and 1% (5-year).  Class C return includes the contingent deferred
sales  charge  of 1%  (1-year).  An  explanation  of the  different  performance
calculations is in the Fund's prospectus. Class B and C shares are subject to an
annual 0.75% asset-based sales charge.

2.  Portfolio  data are as of January 31,  1999,  are dollar  weighted  based on
invested  assets and  subject  to  change.  The Fund may invest up to 25% of its
assets in  below-investment-grade  securities  which carry  greater risk that an
issuer may default on repayment of  principal or interest.  Securities  rated by
any rating  organization are included in the equivalent Standard & Poor's rating
category.  Average credit quality and allocation  include  securities rated by a
national rating  organization as well as unrated securities  (currently 14.3% of
total  investments) to which the Manager in its judgment has assigned ratings as
securities comparable to those rated by a rating agency in the same category.

3. Sector weightings are as of January 31, 1999, and are subject to change.

                   11 Oppenheimer Pennsylvania Municipal Fund

<PAGE>   12




FINANCIALS
- --------------------------------------------------------------------------------









                   12 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   13

STATEMENT OF INVESTMENTS January 31, 1999 (Unaudited)

<TABLE>
<CAPTION>
                                                        RATINGS:
                                                        MOODY'S/                  FACE              MARKET VALUE
                                                        S&P/FITCH                 AMOUNT            SEE NOTE 1
================================================================================================================
<S>                                                     <C>                       <C>               <C>
MUNICIPAL BONDS AND NOTES--98.7%
- ----------------------------------------------------------------------------------------------------------------
PENNSYLVANIA--86.6%
Allegheny Cnty., PA Residential
FAU SFM RB, 5.625%, 11/1/23                             Aaa/NR                    $    15,000       $     15,238
- ----------------------------------------------------------------------------------------------------------------
Beaver Cnty., PA IDAU PC RRB,
Toledo Edison Project, Series A, 7.75%, 5/1/20          Ba1/BB+/BB                  2,000,000          2,310,480
- ----------------------------------------------------------------------------------------------------------------
Berks Cnty., PA GOB, Prerefunded,
FGIC Insured, Inverse Floater, 9.08%, 11/10/20(1)       Aaa/AAA/AAA                 1,000,000          1,228,750
- ----------------------------------------------------------------------------------------------------------------
Blair Cnty., PA HA RB, Altoona Hospital Project,
AMBAC Insured, Inverse Floater, 8.212%, 7/1/14(1)       Aaa/AAA/AAA                   700,000            833,343
- ----------------------------------------------------------------------------------------------------------------
Delaware Cnty., PA College Authority RRB,
Neumann College, Series A, 5.375%, 10/1/26              NR/BBB-                     2,200,000          2,206,402
- ----------------------------------------------------------------------------------------------------------------
Delaware Cnty., PA University Authority RB,
Villanova University, MBIA Insured, 6.90%, 8/1/16       Aaa/AAA                     1,000,000          1,080,630
- ----------------------------------------------------------------------------------------------------------------
Delaware Valley, PA Regional FAU RB, Series C,
AMBAC Insured, Inverse Floater, 7.344%, 8/1/18(1)       Aaa/AAA/AAA                 1,250,000          1,489,062
- ----------------------------------------------------------------------------------------------------------------
Erie, PA SDI GORB, CAP, FSA Insured,
Zero Coupon, 5.35%, 9/1/18(2)                           NR/AAA/AAA                  4,780,000          1,813,245
- ----------------------------------------------------------------------------------------------------------------
Langhorne, PA St. Mary HA RRB, Franciscan
Health Project, Series B, BIG Insured, 7%, 7/1/14       Aaa/AAA/AAA                   500,000            517,670
- ----------------------------------------------------------------------------------------------------------------
Lehigh Cnty., PA GP Authority RRB,
Kidspeace Obligation Group, 6%, 11/1/23                 NR/NR                       2,000,000          2,021,800
- ----------------------------------------------------------------------------------------------------------------
Lehigh Cnty., PA GP RB, Lehigh Valley
Hospital, Inc., Series A, MBIA Insured, 7%, 7/1/16      Aaa/AAA                     1,250,000          1,585,012
- ----------------------------------------------------------------------------------------------------------------
Monroeville, PA HA RRB, Forbes Health System,
6.25%, 10/1/15(3)                                       Caa1/B                      4,000,000          3,520,000
- ----------------------------------------------------------------------------------------------------------------
Montgomery Cnty., PA Health & HEAU RRB,
Suburban General Hospital,
AMBAC Insured, 7.25%, 5/1/16                            Aaa/AAA/AAA                    50,000             50,571
- ----------------------------------------------------------------------------------------------------------------
PA Convention Center Authority RB,
Escrowed to Maturity, Series A,
FGIC Insured, 6.70%, 9/1/16                             Aaa/AAA/AAA                 1,850,000          2,283,529
- ----------------------------------------------------------------------------------------------------------------
PA EDFAU Facilities RB, National Gypsum Co.,
Series B, 6.125%, 11/2/27                               NR/NR                       4,000,000          3,968,520
- ----------------------------------------------------------------------------------------------------------------
PA EDFAU RR RB, Colver Project,
Series D, 7.15%, 12/1/18                                NR/BBB-                     2,000,000          2,220,480
- ----------------------------------------------------------------------------------------------------------------
PA EDFAU RR RB, Northampton Generating,
Series A, 6.50%, 1/1/13                                 NR/BBB-                     1,450,000          1,537,174
- ----------------------------------------------------------------------------------------------------------------
PA EDFAU Wastewater Treatment RB, Sun Co.,
Inc., R & M Project, Series A, 7.60%, 12/1/24           Baa2/BBB                    2,000,000          2,280,460
- ----------------------------------------------------------------------------------------------------------------
PA HEAA Student Loan RB, Series B,
AMBAC Insured, Inverse Floater, 8.209%, 3/1/22(1)       Aaa/AAA/AAA                 1,250,000          1,429,688
- ----------------------------------------------------------------------------------------------------------------
PA HEFAU College & Universities RB,
Geneva College, 5.375%, 4/1/23                          NR/BBB-                     1,800,000          1,790,208
</TABLE>


                   13 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   14

STATEMENT OF INVESTMENTS (Unaudited) (Continued)

<TABLE>
<CAPTION>
                                                        RATINGS:
                                                        MOODY'S/                  FACE              MARKET VALUE
                                                        S&P/FITCH                 AMOUNT            SEE NOTE 1
================================================================================================================
<S>                                                     <C>                       <C>               <C>
PENNSYLVANIA (CONTINUED)
PA HEFAU College & Universities RRB,
Temple University, 7.40%, 10/1/10                       NR/A                      $     5,000       $      5,065
- ----------------------------------------------------------------------------------------------------------------
PA HEFAU RRB, Unrefunded Balance, Series A,
MBIA Insured, 6.625%, 8/15/09                           NR/AAA                        305,000            339,407
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Inverse Floater, 10.326%,
10/3/23(1)(3)                                           Aa2/AA+                     1,000,000          1,130,000
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 28, 7.45%, 10/1/10                Aa2/AA+                        15,000             15,668
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 34B, 7%,4/1/24                    Aa2/AA+                        10,000             10,475
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 40, 6.80%, 10/1/15                Aa2/AA+                     2,000,000          2,170,180
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 44C, 6.65%, 10/1/21               Aa2/AA+                     1,000,000          1,085,220
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 54A, 6.15%, 10/1/22               Aa2/AA+                     1,025,000          1,089,380
- ----------------------------------------------------------------------------------------------------------------
PA HFA SFM RB, Series 61A, 5.50%, 4/1/29                Aa2/AA+                       500,000            513,365
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Gas Works RB, 15th Series,
MBIA Insured, 5.25%, 8/1/15                             NR/AAA                      1,000,000          1,031,570
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA GOUN, FSA Insured,
5%, 3/15/28                                             Aaa/AAA/AAA                 5,000,000          4,950,500
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Hospitals & HEFAU RRB,
Albert Einstein Medical Center, 7.625%, 4/1/11          A3/AAA                      3,500,000          3,597,580
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Hospitals & HEFAU RRB,
Jeanes Health System Project, 6.60%, 7/1/10             NR/BBB+                     3,560,000          3,922,052
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Hospitals & HEFAU RRB,
Jeanes Hospital Project, 5.875%, 7/1/17                 Baa2/BBB+                   1,500,000          1,542,900
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Hospitals & HEFAU RRB,
Temple University Hospital, Series A,
6.625%, 11/15/23                                        Baa1/A-                     3,800,000          4,075,310
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA IDAU HCF RRB,
Baptist Home of Philadelphia, Series A,
5.60%, 11/15/28                                         NR/NR                       3,000,000          2,929,650
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA IDAU HCF RRB,
Paul's Run, Series A, 5.875%, 5/15/28                   NR/NR                       3,625,000          3,624,638
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA IDAU RRB, Franklin
Institute Project, 5.20%, 6/15/26                       Baa2/NR                     1,400,000          1,352,358
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Redevelopment Authority
Home Mtg. RB, Series A, 10.25%, 6/1/17                  A1/A                           85,000             92,588
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Regional POAU Lease RB,
MBIA Insured, Inverse Floater, 8.50%, 9/1/20(1)         Aaa/AAA                     2,100,000          2,475,375
- ----------------------------------------------------------------------------------------------------------------
Philadelphia, PA Water & Wastewater RB,
FGIC Insured, 10%, 6/15/05                              Aaa/AAA/AAA                 4,400,000          5,878,708
- ----------------------------------------------------------------------------------------------------------------
Pittsburgh, PA Urban Redevelopment
Authority Mtg. RRB, Series A, 6.05%, 10/1/26            Aa2/AAA                        45,000             47,423
- ----------------------------------------------------------------------------------------------------------------
Pittsburgh, PA Urban Redevelopment
Authority Mtg. RRB, Series A, 6.20%, 10/1/21            Aa2/AAA                       435,000            465,794
- ----------------------------------------------------------------------------------------------------------------
</TABLE>

                   14 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   15

<TABLE>
<CAPTION>
                                                        RATINGS:
                                                        MOODY'S/                  FACE              MARKET VALUE
                                                        S&P/FITCH                 AMOUNT            SEE NOTE 1
================================================================================================================
<S>                                                     <C>                       <C>               <C>
PENNSYLVANIA (CONTINUED)
Pittsburgh, PA Urban Redevelopment
Authority Mtg. RRB, Series A, 6.25%, 10/1/28              Aa2/AAA                 $1,070,000        $  1,147,297
- ----------------------------------------------------------------------------------------------------------------
Pittsburgh, PA Urban Redevelopment
Authority Mtg. RRB, Series C, 5.95%, 10/1/29              Aa2/AAA                   2,515,000          2,667,786
- ----------------------------------------------------------------------------------------------------------------
Pittsburgh, PA Water & Sewer Authority RRB,
Escrowed to Maturity,  FGIC Insured,  7.25%, 9/1/14       Aaa/NR/AAA                1,200,000          1,506,084
- ----------------------------------------------------------------------------------------------------------------
Reading, PA Parking Authority CAP RB,
MBIA Insured, Zero Coupon, 5.70%, 11/15/15(2)             Aaa/AAA                   2,345,000          1,046,902
- ----------------------------------------------------------------------------------------------------------------
Schuylkill Cnty., PA IDAU RR RRB,
Schuylkill Energy Resources, Inc., 6.50%, 1/1/10(3)       NR/NR/BB+                 4,040,000          4,152,797
- ----------------------------------------------------------------------------------------------------------------
Westmoreland Cnty., PA IDAU RRB,
Redstone HCF,  5.85%, 11/15/29                            NR/NR                     2,000,000          1,977,280
                                                                                                    ------------
                                                                                                      89,025,614

================================================================================================================
U.S. POSSESSIONS--12.1%
Guam Housing Corp. SFM RB,
Series A, 5.75%, 9/1/31                                   NR/AAA                    4,500,000          4,916,476
- ----------------------------------------------------------------------------------------------------------------
PR CMWLTH GORB, MBIA Insured,
Inverse Floater, 7.884%, 7/1/08(1)                        Aaa/AAA                   1,000,000          1,137,500
- ----------------------------------------------------------------------------------------------------------------
PR CMWLTH HTAU RB, Series Y, 5%, 7/1/36                   Baa1/A                    3,100,000          3,119,623
- ----------------------------------------------------------------------------------------------------------------
PR EPAU CAP RRB, Series N, MBIA Insured,
Zero Coupon, 5.69%, 7/1/17(2)                             Aaa/AAA                   3,300,000          1,389,696
- ----------------------------------------------------------------------------------------------------------------
PR Industrial Tourist Educational Medical &
Environmental Control Facilities RB,
Polytechnic University Project,
Series A, 6.50%, 8/1/24                                   NR/BBB-                     970,000          1,060,685
- ----------------------------------------------------------------------------------------------------------------
PR POAU RB, American Airlines SPF Project,
Series A, 6.25%, 6/1/26                                   Baa2/BBB-                   675,000            724,781
- ----------------------------------------------------------------------------------------------------------------
PR Public Buildings Authority Guaranteed
Public Education & HF RRB, Series I, 6%, 7/1/12           Baa1/A                      130,000            131,517
                                                                                                    ------------
                                                                                                      12,480,278

- ----------------------------------------------------------------------------------------------------------------
TOTAL INVESTMENTS, AT VALUE (COST $95,591,843)                                           98.7%       101,505,892
- ----------------------------------------------------------------------------------------------------------------
OTHER ASSETS NET OF LIABILITIES                                                           1.3          1,315,366
                                                                                  -----------       ------------
NET ASSETS                                                                              100.0%      $102,821,258
                                                                                  ===========       ============
</TABLE>


                   15 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   16

STATEMENT OF INVESTMENTS (Unaudited) (Continued)

- -------------------------------------------------------------------------------
To simplify the  listings of  securities,  abbreviations  are used per the table
below:

<TABLE>
<S>                                                       <C>
CAP       -- Capital Appreciation                         HF      -- Health Facilities
CMWLTH    -- Commonwealth                                 HEFAU   -- Higher Educational Facilities Authority
EDFAU     -- Economic Development Finance Authority       HFA     -- Housing Finance Agency
EPAU      -- Electric Power Authority                     HTAU    -- Highway & Transportation Authority
FAU       -- Finance Authority                            IDAU    -- Industrial Development Authority
GP        -- General Purpose                              PC      -- Pollution Control
GOB       -- General Obligation Bonds                     POAU    -- Port Authority
GORB      -- General Obligation Refunding Bonds           RB      -- Revenue Bonds
GOUN      -- General Obligation Unlimited Nts.            RR      -- Resource Recovery
HA        -- Hospital Authority                           RRB     -- Revenue Refunding Bonds
HCF       -- Health Care Facilities                       SDI     -- School District
HEAA      -- Higher Education Assistance Agency           SFM     -- Single Family Mtg.
HEAU      -- Higher Education Authority                   SPF     -- Special Facilities
</TABLE>

1.  Represents  the current  interest  rate for a variable rate bond known as an
"inverse  floater"  which pays  interest  at a rate that varies  inversely  with
short-term interest rates. As interest rates rise, inverse floaters produce less
current  income.Their  price may be more volatile than the price of a comparable
fixed-rate  security.  Inverse  floaters  amount to  $9,723,718  or 9.46% of the
Fund's net assets as of January 31, 1999.

2. For zero coupon bonds,  the interest rate shown is the effective yield on the
date of purchase.

3.  Identifies  issues  considered to be illiquid or  restricted--See  Note 6 of
Notes to Financial Statements.


                   16 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   17

- --------------------------------------------------------------------------------
As of January 31, 1999, securities subject to the alternative minimum tax amount
to $27,307,324 or 26.56% of the Fund's net assets.

Distribution of investments by industry, as a percentage of total investments at
value, is as follows:

<TABLE>
<CAPTION>
INDUSTRY                                                                         MARKET VALUE            PERCENT
- ----------------------------------------------------------------------------------------------------------------
<S>                                                                              <C>                       <C>
Hospital/Healthcare                                                              $ 19,644,438               19.4%
- ----------------------------------------------------------------------------------------------------------------
Single Family Housing                                                              15,226,878               15.0
- ----------------------------------------------------------------------------------------------------------------
General Obligation                                                                  9,261,512                9.1
- ----------------------------------------------------------------------------------------------------------------
Adult Living Facilities                                                             8,531,567                8.4
- ----------------------------------------------------------------------------------------------------------------
Resource Recovery                                                                   7,910,451                7.8
- ----------------------------------------------------------------------------------------------------------------
Water Utilities                                                                     7,384,792                7.3
- ----------------------------------------------------------------------------------------------------------------
Corporate Backed                                                                    6,973,761                6.9
- ----------------------------------------------------------------------------------------------------------------
Higher Education                                                                    6,482,398                6.4
- ----------------------------------------------------------------------------------------------------------------
Not-for-Profit Organization                                                         3,374,158                3.3
- ----------------------------------------------------------------------------------------------------------------
Highways                                                                            3,119,623                3.1
- ----------------------------------------------------------------------------------------------------------------
Marine/Aviation Facilities                                                          2,475,375                2.4
- ----------------------------------------------------------------------------------------------------------------
Pollution Control                                                                   2,310,480                2.3
- ----------------------------------------------------------------------------------------------------------------
Municipal Leases                                                                    2,283,529                2.2
- ----------------------------------------------------------------------------------------------------------------
Education                                                                           1,489,063                1.5
- ----------------------------------------------------------------------------------------------------------------
Student Loans                                                                       1,429,688                1.4
- ----------------------------------------------------------------------------------------------------------------
Electric Utilities                                                                  1,389,696                1.4
- ----------------------------------------------------------------------------------------------------------------
Parking Fee Revenue                                                                 1,046,902                1.0
- ----------------------------------------------------------------------------------------------------------------
Gas Utilities                                                                       1,031,570                1.0
- ----------------------------------------------------------------------------------------------------------------
Multifamily Housing                                                                   140,011                0.1
                                                                                 ------------              -----
Total                                                                            $101,505,892              100.0%
                                                                                 ============              =====
</TABLE>

See accompanying Notes to Financial Statements.

                  17 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   18

STATEMENT OF ASSETS AND LIABILITIES January 31, 1999 (Unaudited)

<TABLE>
<CAPTION>
================================================================================================================
<S>                                                                                                <C>
ASSETS
Investments, at value (cost $95,591,843)--see accompanying statement                                $101,505,892
- ----------------------------------------------------------------------------------------------------------------
Cash                                                                                                     258,733
- ----------------------------------------------------------------------------------------------------------------
Receivables and other assets:
Interest                                                                                               1,436,996
Shares of beneficial interest sold                                                                       118,000
Other                                                                                                      3,041
                                                                                                    ------------
Total assets                                                                                         103,322,662

================================================================================================================
LIABILITIES 
PAYABLES AND OTHER LIABILITIES:
Dividends                                                                                                258,061
Trustees' compensation--Note 1                                                                            69,989
Shares of beneficial interest redeemed                                                                    65,479
Investments purchased                                                                                     47,722
Shareholder reports                                                                                       32,130
Distribution and service plan fees                                                                        12,791
Transfer and shareholder servicing agent fees                                                              5,736
Other                                                                                                      9,496
                                                                                                    ------------
Total liabilities                                                                                        501,404


================================================================================================================
NET ASSETS                                                                                          $102,821,258
                                                                                                    ============

================================================================================================================
COMPOSITION OF NET ASSETS
Paid-in capital                                                                                     $ 98,295,800
- ----------------------------------------------------------------------------------------------------------------
Overdistributed net investment income                                                                   (184,370)
- ----------------------------------------------------------------------------------------------------------------
Accumulated net realized loss on investment transactions                                              (1,204,221)
- ----------------------------------------------------------------------------------------------------------------
Net unrealized appreciation on investments--Note 3                                                     5,914,049
                                                                                                    ------------
Net assets                                                                                          $102,821,258
                                                                                                    ============
</TABLE>


                   18 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   19

<TABLE>
================================================================================================================
<S>                                                                                                      <C>
NET ASSET VALUE PER SHARE
Class A Shares:
Net asset value and redemption price per share (based on net assets of
$72,563,712 and 5,775,421 shares of beneficial interest outstanding)                                      $12.56
Maximum offering price per share (net asset value plus sales charge of
4.75% of offering price)                                                                                  $13.19

- ----------------------------------------------------------------------------------------------------------------
Class B Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales
charge) and offering price per share (based on net assets of $24,153,922
and 1,922,768 shares of beneficial interest outstanding)                                                  $12.56

- ----------------------------------------------------------------------------------------------------------------
Class C Shares:
Net asset value, redemption price (excludes applicable contingent deferred sales
charge) and offering price per share (based on net assets of $6,103,624
and 486,147 shares of beneficial interest outstanding)                                                    $12.56
</TABLE>


See accompanying Notes to Financial Statements.

                   19 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   20

STATEMENT OF OPERATIONS For the Six Months Ended January 31, 1999 (Unaudited)

<TABLE>
================================================================================================================
<S>                                                                                                  <C>
INVESTMENT INCOME
Interest                                                                                              $2,924,206

================================================================================================================
EXPENSES
Management fees--Note 4                                                                                  301,675
- ----------------------------------------------------------------------------------------------------------------
Distribution and service plan fees--Note 4:
Class A                                                                                                   50,946
Class B                                                                                                  117,125
Class C                                                                                                   29,004
- ----------------------------------------------------------------------------------------------------------------
Transfer and shareholder servicing agent fees--Note 4                                                     37,926
- ----------------------------------------------------------------------------------------------------------------
Shareholder reports                                                                                       17,845
- ----------------------------------------------------------------------------------------------------------------
Trustees' compensation--Note 1                                                                            13,572
- ----------------------------------------------------------------------------------------------------------------
Legal, auditing and other professional fees                                                                9,233
- ----------------------------------------------------------------------------------------------------------------
Custodian fees                                                                                             7,075
- ----------------------------------------------------------------------------------------------------------------
Other                                                                                                      3,966
                                                                                                      ----------
Total expenses                                                                                           588,367
Less expenses paid indirectly--Note 4                                                                     (6,811)
Less reimbursement of expenses by OppenheimerFunds, Inc.--Note 4                                         (29,696)
                                                                                                      ----------
Net expenses                                                                                             551,860

================================================================================================================
NET INVESTMENT INCOME                                                                                  2,372,346

================================================================================================================
REALIZED AND UNREALIZED GAIN
Net realized gain on:
Investments                                                                                              154,415
Closing of futures contracts                                                                              87,338
                                                                                                      ----------
Net realized gain                                                                                        241,753
- ----------------------------------------------------------------------------------------------------------------
Net change in unrealized appreciation or depreciation on investments                                     740,908
                                                                                                      ----------
Net realized and unrealized gain                                                                         982,661

================================================================================================================
Net Increase in Net Assets Resulting from Operations                                                  $3,355,007
                                                                                                      ==========
</TABLE>

See accompanying Notes to Financial Statements.


                   20 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   21


STATEMENTS OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                            SIX MONTHS ENDED
                                                                            JANUARY 31, 1999       YEAR ENDED
                                                                            (UNAUDITED)            JULY 31, 1998
================================================================================================================
<S>                                                                         <C>                    <C>
OPERATIONS
Net investment income                                                        $  2,372,346          $   4,370,631
- ----------------------------------------------------------------------------------------------------------------
Net realized gain (loss)                                                          241,753               (130,703)
- ----------------------------------------------------------------------------------------------------------------
Net change in unrealized appreciation or depreciation                             740,908                172,958
                                                                             ------------          -------------
Net increase in net assets resulting from operations                            3,355,007              4,412,886

================================================================================================================
DIVIDENDS TO SHAREHOLDERS
Dividends from net investment income:
Class A                                                                        (1,669,506)            (3,520,410)
Class B                                                                          (459,307)              (906,174)
Class C                                                                          (113,653)              (174,394)

================================================================================================================
BENEFICIAL  INTEREST  TRANSACTIONS
Net  increase in net assets  resulting  from
beneficial interest transactions--Note 2:
Class A                                                                         3,053,034                571,952
Class B                                                                         1,769,885              2,831,354
Class C                                                                           844,098              2,596,680


================================================================================================================
NET ASSETS
Total increase                                                                  6,779,558              5,811,894
- ----------------------------------------------------------------------------------------------------------------
Beginning of period                                                            96,041,700             90,229,806
                                                                             ------------          -------------
End of period (including overdistributed net investment
income of $184,370 and $314,250, respectively)                               $102,821,258          $  96,041,700
                                                                             ============          =============
</TABLE>

See accompanying Notes to Financial Statements.


                   21 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   22

FINANCIAL HIGHLIGHTS

<TABLE>
<CAPTION>
                                            CLASS A
                                            --------------------------------------------------------------------
                                            SIX MONTHS
                                            ENDED
                                            JANUARY 31,
                                            1999                YEAR ENDED JULY 31,
                                            (UNAUDITED)         1998                1997                1996(2)
================================================================================================================
<S>                                           <C>                 <C>                 <C>                <C>
PER SHARE OPERATING DATA                      
Net asset value, beginning of period           $12.42              $12.45              $12.01             $12.36
- ----------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment income                             .32                 .61                 .70                .40
Net realized and unrealized gain (loss)           .12                  --                 .43               (.35)
                                               ------              ------              ------             ------
Total income (loss) from
investment operations                             .44                 .61                1.13                .05
- ----------------------------------------------------------------------------------------------------------------
Dividends and distributions to shareholders:
Dividends from net investment income             (.30)               (.64)               (.69)              (.40)
Dividends in excess of net
investment income                                  --                  --                  --                 --
                                               ------              ------              ------             ------
Total dividends and distributions
to shareholders                                  (.30)               (.64)               (.69)              (.40)
- ----------------------------------------------------------------------------------------------------------------
Net asset value, end of period                 $12.56              $12.42              $12.45             $12.01
                                               ======              ======              ======             ======

================================================================================================================
TOTAL RETURN, AT NET ASSET VALUE(3)              3.51%               4.99%               9.68%              0.44%

================================================================================================================
RATIOS/SUPPLEMENTAL DATA
Net assets, end of period
(in thousands)                                $72,564             $68,720             $68,280            $64,391
- ----------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)             $70,772             $69,202             $65,710            $64,997
- ----------------------------------------------------------------------------------------------------------------
Ratios to average net assets:
Net investment income                          4.90%(4)              4.82%               5.79%              5.71%(4)
Expenses, before voluntary assumption
by the Manager or Distributor(5)               0.92%(4)              1.00%               0.93%              1.03%(4)
Expenses, net of voluntary assumption
by the Manager or Distributor                  0.88%(4)              0.93%               0.90%               N/A
- ----------------------------------------------------------------------------------------------------------------
Portfolio turnover rate(6)                        7%                   35%                 22%                 6%
</TABLE>

1. For the period from August 29, 1995,  (inception of offering) to December 31,
1995.

2. For the seven  months  ended  July 31,  1996.  The Fund  changed  its  fiscal
year-end from December 31 to July 31.

                   22 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   23

<TABLE>
<CAPTION>
                              CLASS B
- ------------------------      ----------------------------------------------------------------------------------
                              SIX MONTHS
                              ENDED
                              JANUARY 31,                                                   YEAR ENDED
YEAR ENDED DECEMBER 31,       1999             YEAR ENDED JULY 31,                          DECEMBER 31,
1995           1994           (UNAUDITED)      1998           1997           1996(2)        1995          1994
================================================================================================================
  <S>            <C>            <C>           <C>            <C>            <C>            <C>           <C>
   $11.19         $12.85         $12.42        $12.45         $12.01         $12.36         $11.19        $12.84
- ----------------------------------------------------------------------------------------------------------------

      .68            .67            .27           .52            .61            .35            .59           .59
     1.18          (1.64)           .12            --            .42           (.35)          1.17         (1.65)
   ------         ------         ------        ------         ------         ------         ------        ------

     1.86           (.97)           .39           .52           1.03             --           1.76         (1.06)

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

     (.67)          (.69)          (.25)         (.55)          (.59)          (.35)          (.57)         (.59)

     (.02)            --             --            --             --             --           (.02)           --
   ------         ------         ------        ------         ------         ------         ------        ------


     (.69)          (.69)          (.25)         (.55)          (.59)          (.35)          (.59)         (.59)
- ----------------------------------------------------------------------------------------------------------------
   $12.36         $11.19         $12.56        $12.42         $12.45         $12.01         $12.36        $11.19
   ======         ======         ======        ======         ======         ======         ======        ======

================================================================================================================
    16.94%         (7.68)%         3.12%         4.20%          8.86%         (0.01)%        16.06%        (8.32)%

================================================================================================================


  $66,483        $60,857        $24,154       $22,124        $19,339        $16,005        $14,466        $9,484
- ----------------------------------------------------------------------------------------------------------------
  $64,901        $62,786        $23,245       $20,969        $17,243        $15,085        $12,183        $7,329
- ----------------------------------------------------------------------------------------------------------------

     5.68%          5.65%          4.04%(4)      4.10%          5.02%          4.94%(4)       4.89%         4.88%

     1.02%          0.98%          1.78%(4)      1.75%          1.78%          1.89%(4)       1.89%         1.85%

       N/A            N/A          1.64%(4)      1.68%          1.65%          1.79%(4)       1.78%         1.75%
- ----------------------------------------------------------------------------------------------------------------
       31%            37%             7%            35%           22%             6%            31%           37%
</TABLE>

3.  Assumes a  hypothetical  initial  investment  on the business day before the
first day of the fiscal period (or  inception of  offering),  with all dividends
and distributions reinvested in additional shares on the reinvestment date, and

redemption  at the net asset value  calculated  on the last  business day of the
fiscal  period.  Sales  charges are not  reflected in the total  returns.  Total
returns are not annualized for periods of less than one full year.

4. Annualized.

5.  Beginning in fiscal  1995,  the expense  ratio  reflects the effect of gross
expenses paid  indirectly by the Fund.  Prior year expense  ratios have not been
adjusted.


                   23 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   24
FINANCIAL HIGHLIGHTS  (continued)

<TABLE>
<CAPTION>
                                             CLASS C
                                             -------------------------------------------------------------------
                                             SIX MONTHS
                                             ENDED                                                       PERIOD
                                             JANUARY 31,                                                 ENDED
                                             1999            YEAR ENDED JULY 31,                         DEC. 31
                                             (UNAUDITED)     1998           1997           1996(2)       1995(1)
================================================================================================================
<S>                                           <C>            <C>            <C>            <C>            <C>
PER SHARE OPERATING DATA
Net asset value, beginning of period          $12.41         $12.44         $12.00         $12.36         $11.91
- ----------------------------------------------------------------------------------------------------------------
Income (loss) from investment operations:
Net investment income                            .26            .51            .60            .34            .21
Net realized and unrealized gain (loss)          .14             --            .43           (.36)           .45
                                              ------         ------         ------         ------         ------
Total income (loss) from
investment operations                            .40            .51           1.03           (.02)           .66

- ----------------------------------------------------------------------------------------------------------------
Dividends and distributions to shareholders:
Dividends from net investment income            (.25)          (.54)          (.59)          (.34)          (.21)
Dividends in excess of net
investment income                                 --             --             --             --             --
                                              ------         ------         ------         ------         ------
Total dividends and distributions
to shareholders                                 (.25)          (.54)          (.59)          (.34)          (.21)
- ----------------------------------------------------------------------------------------------------------------
Net asset value, end of period                $12.56         $12.41         $12.44         $12.00         $12.36
                                              ======         ======         ======         ======         ======

================================================================================================================
Total Return, at Net Asset Value(3)             3.21%          4.20%          8.84%         (0.15)%         5.55%

================================================================================================================
Ratios/Supplemental Data
Net assets, end of period
(in thousands)                                $6,104         $5,198         $2,611           $482           $264
- ----------------------------------------------------------------------------------------------------------------
Average net assets (in thousands)             $5,758         $4,063         $1,390           $296           $ 51
- ----------------------------------------------------------------------------------------------------------------
Ratios to average net assets:
Net investment income                           4.02%(4)       4.28%          4.99%          4.83%(4)       4.40%(4)
Expenses, before voluntary assumption
by the Manager or Distributor(5)                1.78%(4)       1.76%          1.79%          1.97%(4)       2.07%(4)
Expenses, net of voluntary assumption
by the Manager or Distributor                   1.64%(4)       1.67%          1.66%          1.87%(4)       1.96%(4)
- ----------------------------------------------------------------------------------------------------------------
Portfolio turnover rate(6)                         7%            35%            22%             6%            31%
</TABLE>


6. The  lesser  of  purchases  or sales of  portfolio  securities  for a period,
divided by the monthly average of the market value of portfolio securities owned
during the period.  Securities with a maturity or expiration date at the time of
acquisition of one year or less are excluded from the calculation. Purchases and
sales of investment securities (excluding short-term  securities) for the period
ended January 31, 1999, were $12,671,597 and $7,032,568, respectively.

See accompanying Notes to Financial Statements.

                   24 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   25

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

================================================================================
1. SIGNIFICANT ACCOUNTING POLICIES
Oppenheimer  Pennsylvania  Municipal  Fund (the  Fund) is a  separate  series of
Oppenheimer Multi-State Municipal Trust, a non-diversified,  open-end management
investment  company  registered  under the  Investment  Company Act of 1940,  as
amended.  The Fund's investment  objective is to seek as high a level of current
interest income exempt from federal and Pennsylvania personal income taxes as is
available from municipal  securities,  consistent with  preservation of capital.
The Fund's investment advisor is OppenheimerFunds,  Inc. (the Manager). The Fund
offers  Class A,  Class B and  Class C  shares.  Class A shares  are sold with a
front-end  sales  charge.  Class  B and  Class  C  shares  may be  subject  to a
contingent deferred sales charge. All classes of shares have identical rights to
earnings,  assets  and  voting  privileges,  except  that each class has its own
distribution and/or service plan,  expenses directly  attributable to that class
and exclusive voting rights with respect to matters affecting that class.  Class
B shares will  automatically  convert to Class A shares six years after the date
of purchase.  The  following  is a summary of  significant  accounting  policies
consistently followed by the Fund.

- --------------------------------------------------------------------------------
INVESTMENT  VALUATION.  Portfolio  securities are valued at the close of the New
York Stock  Exchange on each trading day.  Listed and  unlisted  securities  for
which such  information is regularly  reported are valued at the last sale price
of the day or, in the  absence of sales,  at values  based on the closing bid or
the  last  sale  price  on the  prior  trading  day.  Long-term  and  short-term
"non-money  market" debt  securities are valued by a portfolio  pricing  service
approved by the Board of Trustees.  Such securities which cannot be valued by an
approved portfolio pricing service are valued using  dealer-supplied  valuations
provided the Manager is satisfied that the firm rendering the quotes is reliable
and  that  the  quotes  reflect  current  market  value,  or  are  valued  under
consistently  applied  procedures  established  by  the  Board  of  Trustees  to
determine  fair  value  in good  faith.  Short-term  "money  market  type"  debt
securities having a remaining maturity of 60 days or less are valued at cost (or
last  determined  market  value)  adjusted for  amortization  to maturity of any
premium or discount.

- --------------------------------------------------------------------------------
ALLOCATION OF INCOME,  EXPENSES,  GAINS AND LOSSES. Income, expenses (other than
those attributable to a specific class), gains and losses are allocated daily to
each  class  of  shares  based  upon  the  relative  proportion  of  net  assets
represented  by  such  class.  Operating  expenses  directly  attributable  to a
specific class are charged against the operations of that class.


                   25 Oppenheimer Pennsylvania Municipal Fund 
<PAGE> 26 
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

================================================================================
1. SIGNIFICANT ACCOUNTING POLICIES(CONTINUED)
FEDERAL  TAXES.  The Fund intends to continue to comply with  provisions  of the
Internal  Revenue Code  applicable  to  regulated  investment  companies  and to
distribute  all of its  taxable  income,  including  any  net  realized  gain on
investments  not  offset by loss  carryovers,  to  shareholders.  Therefore,  no
federal  income or excise tax  provision is required.  As of July 31, 1998,  the
Fund had  available  for  federal  income tax  purposes an unused  capital  loss
carryover of approximately $1,446,000, which expires between 2002 and 2006.

- --------------------------------------------------------------------------------
TRUSTEES' COMPENSATION. The Fund has adopted a nonfunded retirement plan for the
Fund's  independent  trustees.  Benefits  are based on years of service and fees
paid to each  trustee  during the years of service.  During the six months ended
January  31,  1999,  a  provision  of $2,489 was made for the  Fund's  projected
benefit  obligations,  resulting  in an  accumulated  liability of $67,802 as of
January 31, 1999.

        The Board of  Trustees  had  adopted a  deferred  compensation  plan for
independent Trustees that enables Trustees to elect to defer receipt of all or a
portion of annual  fees they are  entitled to receive  from the Fund.  Under the
plan, the compensation deferred is periodically adjusted as though an equivalent
amount had been  invested  for the Trustee in shares of one or more  Oppenheimer
funds  selected by the  Trustee.  The amount paid to the Trustee  under the plan
will be determined based upon the performance of the selected funds. Deferral of
Trustees'  fees under the plan will not  affect the net assets of the Fund,  and
will not  materially  affect the Fund's  assets,  liabilities  or net income per
share.

- --------------------------------------------------------------------------------
DISTRIBUTIONS TO SHAREHOLDERS.  The Fund intends to declare dividends separately
for Class A, Class B and Class C shares from net investment  income each day the
New York Stock  Exchange is open for  business and pay such  dividends  monthly.
Distributions  from net realized gains on investments,  if any, will be declared
at least once each year.

- --------------------------------------------------------------------------------
CLASSIFICATION  OF DISTRIBUTIONS TO SHAREHOLDERS.  Net investment  income (loss)
and net  realized  gain  (loss)  may  differ  for  financial  statement  and tax
purposes.  The  character  of the  distributions  made  during the year from net
investment   income  or  net  realized   gains  may  differ  from  its  ultimate
characterization  for  federal  income  tax  purposes.  Also,  due to  timing of
dividend  distributions,  the fiscal year in which amounts are  distributed  may
differ from the fiscal year in which the income or realized gain was recorded by
the Fund.



                   26 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   27

================================================================================
OTHER. Investment transactions are accounted for on the date the investments are
purchased or sold (trade date).  Original issue discount on securities purchased
is amortized  over the life of the  respective  securities,  in accordance  with
federal  income tax  requirements.  For bonds  acquired after April 30, 1993, on
disposition or maturity,  taxable ordinary income is recognized to the extent of
the lesser of gain or market  discount  that would have accrued over the holding
period. Realized gains and losses on investments and unrealized appreciation and
depreciation are determined on an identified cost basis, which is the same basis
used for federal income tax purposes.

        The Fund  concentrates its investments in Pennsylvania  and,  therefore,
may have more credit risks related to the economic  conditions  of  Pennsylvania
than a portfolio with a broader geographical diversification.

        The  preparation  of financial  statements in conformity  with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that  affect the  reported  amounts of assets and  liabilities  and
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements and the reported  amounts of income and expenses during the reporting
period. Actual results could differ from those estimates.

- --------------------------------------------------------------------------------
2. SHARES OF BENEFICIAL INTEREST
The Fund has authorized an unlimited number of no par value shares of beneficial
interest of each class.  Transactions  in shares of beneficial  interest were as
follows:

<TABLE>
<CAPTION>
                                           Six Months Ended January 31, 1999       Year Ended July 31, 1998
                                           ---------------------------------       -----------------------------
                                           Shares           Amount                 Shares          Amount
- ----------------------------------------------------------------------------------------------------------------
<S>                                        <C>              <C>                    <C>             <C>
Class A:
Sold                                         505,468         $ 6,335,141             712,372        $  8,887,636
Dividends reinvested                          84,989           1,063,440             173,087           2,155,632
Redeemed                                    (347,140)         (4,345,547)           (839,031)        (10,471,316)
                                            --------         -----------            --------        ------------
Net increase                                 243,317         $ 3,053,034              46,428        $    571,952
                                            ========         ===========            ========        ============

- ----------------------------------------------------------------------------------------------------------------
Class B:
Sold                                         222,225         $ 2,780,523             429,660        $  5,358,387
Dividends reinvested                          21,633             270,582              41,275             513,990
Redeemed                                    (102,427)         (1,281,220)           (243,523)         (3,041,023)
                                            --------         -----------            --------        ------------
Net increase                                 141,431         $ 1,769,885             227,412        $  2,831,354
                                            ========         ===========            ========        ============

- ----------------------------------------------------------------------------------------------------------------
Class C:
Sold                                          74,959         $   938,044             231,025        $  2,873,024
Dividends reinvested                           6,784              84,819               9,616             119,808
Redeemed                                     (14,303)           (178,765)            (31,816)           (396,152)
                                            --------         -----------            --------        ------------
Net increase                                  67,440         $   844,098             208,825        $  2,596,680
                                            ========         ===========            ========        ============
</TABLE>


                   27 Oppenheimer Pennsylvania Municipal Fund

<PAGE>   28
NOTES TO FINANCIAL STATEMENTS  (UNAUDITED) (CONTINUED)

- --------------------------------------------------------------------------------
3. UNREALIZED GAINS AND LOSSES ON INVESTMENTS
As of January 31, 1999, net unrealized appreciation on investments of $5,914,049
was composed of gross  appreciation  of $6,434,622,  and gross  depreciation  of
$520,573.

- --------------------------------------------------------------------------------
4. MANAGEMENT FEES AND OTHER  TRANSACTIONS WITH AFFILIATES  Management fees paid
to the Manager were in accordance  with the investment  advisory  agreement with
the Fund which  provides for a fee of 0.60% of the first $200 million of average
annual  net  assets,  0.55% of the next  $100  million,  0.50% of the next  $200
million,  0.45% of the next $250  million,  0.40% of the next $250  million  and
0.35% of average annual net assets in excess of $1 billion. Effective January 1,
1997,  the  Manager  has  voluntarily  undertaken  to  waive  a  portion  of its
management  fee,  whereby  the Fund  pays a fee not to exceed  0.57% of  average
annual net assets.  The Fund's  management  fee for the six months ended January
31,  1999 was 0.60% of the  average  annual  net  assets of Class A, Class B and
Class C shares before the voluntary waiver by the Manager.

        For the six months ended January 31, 1999,  commissions  (sales  charges
paid by investors) on sales of Class A shares totaled $110,805, of which $16,909
was retained by OppenheimerFunds  Distributor,  Inc. (OFDI), a subsidiary of the
Manager,  as general  distributor,  and by an  affiliated  broker/dealer.  Sales
charges advanced to broker/dealers by OFDI on sales of the Fund's Class A, Class
B and Class C shares totaled $11,500, $101,712 and $7,823, respectively. Amounts
paid to an affiliated  broker/dealer for Class B shares were $4,556.  During the
six months ended  January 31, 1999,  OFDI  received  contingent  deferred  sales
charges of $15,925 upon redemption of Class B shares as reimbursement  for sales
commissions advanced by OFDI at the time of sale of such shares.

        OppenheimerFunds  Services  (OFS),  a division  of the  Manager,  is the
transfer  and  shareholder  servicing  agent for the Fund and other  Oppenheimer
funds.  OFS's total costs of providing  such services are  allocated  ratably to
these funds.

        Expenses  paid  indirectly  represent a reduction of custodian  fees for
earnings on cash balances maintained by the Fund.

        The Fund has adopted a Service Plan for Class A shares to reimburse OFDI
for a portion of its costs incurred in connection with the personal  service and
maintenance of shareholder  accounts that hold Class A shares.  Reimbursement is
made quarterly at an annual rate that may not exceed 0.15% of the average annual
net assets of Class A shares of the Fund. OFDI uses the service fee to reimburse
brokers, dealers, banks and other financial institutions quarterly for providing
personal  service and maintenance of accounts of their customers that hold Class
A shares.  During the six months ended January 31, 1999,  OFDI paid $3,019 to an
affiliated  broker/dealer  as  reimbursement  for Class A personal  service  and
maintenance expenses.


                   28 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   29
- --------------------------------------------------------------------------------
4. MANAGEMENT FEES AND OTHER  TRANSACTIONS WITH AFFILIATES  (CONTINUED) The Fund
has adopted  Distribution  and  Service  Plans for Class B and Class C shares to
compensate  OFDI for its costs in  distributing  Class B and Class C shares  and
servicing  accounts.  Under the Plans, the Fund pays OFDI an annual  asset-based
sales  charge of 0.75% per year on Class B and Class C shares,  for its services
rendered  in  distributing  Class B and Class C shares.  OFDI  also  receives  a
service fee of 0.25% (voluntarily reduced to 0.15% by the Fund's Board) per year
to  compensate  dealers for providing  personal  services for accounts that hold
Class B and Class C shares.  Each fee is  computed  on the  average  annual  net
assets of Class B or Class C shares,  determined as of the close of each regular
business  day.  During the six months  ended  January 31,  1999,  OFDI  retained
$91,652 and $19,580, respectively, as compensation for Class B and Class C sales
commissions and service fee advances, as well as financing costs. If either Plan
is terminated by the Fund,  the Board of Trustees may allow the Fund to continue
payments of the asset-based sales charge to OFDI for distributing  shares before
the Plan was  terminated.  As of January  31,  1999,  OFDI had  incurred  excess
distribution  and servicing  costs of $632,630 for Class B and $52,956 for Class
C.

- --------------------------------------------------------------------------------
5. FUTURES CONTRACTS
The Fund may buy and  sell  interest  rate  futures  contracts  in order to gain
exposure to or protect against changes in interest rates.  The Fund may also buy
or write put or call options on these futures contracts.

        The Fund generally sells futures contracts to hedge against increases in
interest  rates and the  resulting  negative  effect on the value of fixed  rate
portfolio  securities.  The Fund may also  purchase  futures  contracts  to gain
exposure to changes in interest  rates as it may be more efficient than actually
buying fixed income securities.

        Upon entering into a futures  contract,  the Fund is required to deposit
either  cash or  securities  (initial  margin)  in an amount  equal to a certain
percentage of the contract value.  Subsequent  payments  (variation  margin) are
made or received by the Fund each day. The variation  margin  payments are equal
to the daily changes in the contract value and are recorded as unrealized  gains
and losses.  The Fund  recognizes  a realized  gain or loss when the contract is
closed or expires.

        Risks of entering into futures  contracts (and related  options) include
the  possibility  that there may be an illiquid  market and that a change in the
value of the contract or option may not  correlate  with changes in the value of
the underlying securities.


                   29 Oppenheimer Pennsylvania Municipal Fund
 <PAGE> 30 
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED)

- --------------------------------------------------------------------------------
6. ILLIQUID AND RESTRICTED SECURITIES
As of January 31,  1999,  investments  in  securities  included  issues that are
illiquid or restricted.  Restricted  securities  are often  purchased in private
placement transactions, are not registered under the Securities Act of 1933, may
have contractual  restrictions on resale,  and are valued under methods approved
by the Board of Trustees as reflecting  fair value. A security may be considered
illiquid  if it lacks a readily  available  market or if its  valuation  has not
changed for a certain  period of time.  The Fund  intends to invest no more than
10% of its  net  assets  (determined  at  the  time  of  purchase  and  reviewed
periodically)  in  illiquid  and  restricted   securities.   Certain  restricted
securities,  eligible for resale to qualified institutional  investors,  are not
subject to that limit. The aggregate value of illiquid or restricted  securities
subject to this  limitation  as of  January  31,  1999,  was  $8,802,797,  which
represents 8.56% of the Fund's net assets.


- --------------------------------------------------------------------------------
7. BANK BORROWINGS
The Fund may borrow from a bank for temporary or emergency  purposes  including,
without limitation,  funding of shareholder  redemptions provided asset coverage
for  borrowings  exceeds  300%.  The Fund has entered  into an  agreement  which
enables it to participate with other  Oppenheimer  funds in an unsecured line of
credit with a bank, which permits  borrowings up to $400 million,  collectively.
Interest is charged to each fund,  based on its  borrowings,  at a rate equal to
the  Federal  Funds Rate plus 0.35%.  Borrowings  are payable 30 days after such
loan is  executed.  The Fund  also pays a  commitment  fee equal to its pro rata
share of the  average  unutilized  amount of the  credit  facility  at a rate of
0.0575% per annum.

        The Fund had no  borrowings  outstanding  during  the six  months  ended
January 31, 1999.



                   30 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   31
- --------------------------------------------------------------------------------
Oppenheimer Pennsylvania Municipal Fund
- --------------------------------------------------------------------------------

A Series of Oppenheimer Multi-State Municipal Trust

================================================================================
Officers and Trustees    Leon Levy, Chairman of the Board of Trustees
                         Donald W. Spiro, Vice Chairman of the Board of Trustees
                         Bridget A. Macaskill, Trustee and President
                         Robert G. Galli, Trustee
                         Benjamin Lipstein, Trustee
                         Elizabeth B. Moynihan, Trustee
                         Kenneth A. Randall, Trustee
                         Edward V. Regan, Trustee
                         Russell S. Reynolds, Jr., Trustee
                         Pauline Trigere, Trustee
                         Clayton K. Yeutter, Trustee
                         Ronald Fielding, Vice President
                         Anthony A. Tanner, Vice President
                         George C. Bowen, Treasurer
                         Robert J. Bishop, Assistant Treasurer
                         Scott T. Farrar, Assistant Treasurer
                         Andrew J. Donohue, Secretary
                         Robert G. Zack, Assistant Secretary

================================================================================
Investment Advisor       OppenheimerFunds, Inc.

================================================================================
Distributor              OppenheimerFunds Distributor, Inc.

================================================================================
Transfer and Shareholder OppenheimerFunds Services
Servicing Agent

================================================================================
Custodian of Portfolio   Citibank, N.A.
Securities

================================================================================
Independent Auditors     KPMG LLP

================================================================================
Legal Counsel            Gordon Altman Butowsky Weitzen Shalov & Wein

                         The  financial  statements  included  herein  have been
                         taken from the records of the Fund without  examination
                         by the independent auditors.

                         This  is  a  copy  of  a  report  to   shareholders  of
                         Oppenheimer Florida Municipal Fund. This report must be
                         preceded or  accompanied by a Prospectus of Oppenheimer
                         Florida   Municipal  Fund.  For  material   information
                         concerning the Fund, see the Prospectus.

                         Shares  of  Oppenheimer   funds  are  not  deposits  or
                         obligations  of any  bank,  are not  guaranteed  by any
                         bank,  are not insured by the FDIC or any other agency,
                         and involve  investment  risks,  including the possible
                         loss of the principal amount invested.


                   31 Oppenheimer Pennsylvania Municipal Fund
<PAGE>   32

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

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        So   call   us    today,    or    visit   us   at   our    website    at
www.oppenheimerfunds.com--we're here to help.


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RS0740.002.0399 March 31, 1999
/c/Copyright 1999 OppenheimerFunds, Inc. All rights reserved.



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