MINNESOTA MUNICIPAL INCOME PORTFOLIO INC
N-30D, 1998-03-30
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<PAGE>

Minnesota Municipal Income Portfolio - 1998 Annual Report

1998 Annual Report

[LOGO]


MINNESOTA 
MUNICIPAL INCOME
PORTFOLIO 

MXA

<PAGE>

[LOGO]

CONTENTS 

<TABLE>
<S>                                                                         <C>
Portfolio Managers' Letter...................................................  2

Financial Statements and Notes...............................................  6

Investments in Securities.................................................... 16

Independent Auditors' Report................................................. 21

Federal Tax Information...................................................... 22

Shareholder Update........................................................... 23

Glossary..................................................................... 28

</TABLE>


*** This report includes a glossary to help you understand financial terms used 
in the portfolio managers' letter. When you see this symbol, it indicates a word
that is defined in the glossary.

MINNESOTA MUNICIPAL INCOME PORTFOLIO 
- --------------------------------------------------------------------------------

FUND OBJECTIVE
High current income exempt from both regular federal income tax and Minnesota 
personal income tax, consistent with preservation of capital. The fund's income 
may be subject to federal and/or state of Minnesota alternative minimum tax. 
Investors should consult their tax advisors. As with other investment companies,
there can be no assurance this fund will achieve its objective.

PRIMARY INVESTMENTS
A wide range of Minnesota municipal securities rated investment grade or of 
comparable quality when purchased. These securities may include municipal 
derivative securities, such as inverse floating rate and inverse interest-only 
municipal securities, which may be more volatile than traditional municipal 
securities in certain market conditions.

<PAGE>

AVERAGE ANNUALIZED TOTAL RETURNS
- --------------------------------------------------------------------------------

Based on net asset value for the periods ended January 31, 1998
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                         Since
                                                     One     Three     Inception
                                                     Year     Year     (6/25/93)
                                                     ----    -----     ---------
<S>                                                 <C>     <C>       <C>       
Minnesota Municipal Income Portfolio                13.29%   14.11%       7.36%

Lipper General Municipal Bond Funds: 
   Leveraged Average                                12.28%   11.25%       5.99%

Lehman Brothers Municipal Long Bond Index           12.73%   11.52%       7.43%
</TABLE>

Average annualized total returns are through January 31, 1998, and are based on 
the change in net asset value (NAV). They reflect the reinvestment of 
distributions but do not reflect sales charges. NAV-based performance is used to
measure investment management results.

Average annualized total returns based on the change in market price for the 
one-year, three-year and since inception periods ended January 31, 1998, were 
19.60%, 12.61% and 4.82%, respectively. These returns assume reinvestment of all
distributions and reflect sales charges on those distributions described in the 
fund's dividend reinvestment plan, but not on initial purchases.

PLEASE REMEMBER, YOU COULD LOSE MONEY WITH THIS INVESTMENT. NEITHER SAFETY OF 
PRINCIPAL NOR STABILITY OF INCOME IS GUARANTEED. Past performance does not 
guarantee future results. The investment return and principal value of an 
investment will fluctuate so that fund shares, when sold, may be worth more or 
less than their original cost. Closed-end funds, such as this fund, often trade
at discounts to net asset value. Therefore, you may be unable to realize the 
full net asset value of your shares when you sell.

The Lipper General Municipal Bond Funds: Leveraged Average represents the 
average total return, with distributions reinvested, of leveraged perpetual and 
term trust national closed-end municipal funds as characterized by Lipper 
Analytical Services. The Lehman Brothers Municipal Long Bond Index is comprised 
of municipal bonds with more than 22 years to maturity and an average credit 
quality of AA. The index is unmanaged and does not include any fees or expenses 
in its total return figures.

The since inception numbers for the Lipper average and Lehman index are 
calculated from the month end following the fund's inception through January 31,
1998.

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          1998 Annual Report   1   Minnesota Municipal Income Portfolio

<PAGE>

PORTFOLIO MANAGERS' LETTER
- --------------------------------------------------------------------------------

March 18, 1998
- --------------------------------------------------------------------------------

[PHOTO]
DOUG WHITE, CFA,
shares responsibility  for the management of Minnesota Municipal Income 
Portfolio. He has 15 years of financial experience.

DEAR SHAREHOLDERS:

MINNESOTA MUNICIPAL INCOME PORTFOLIO PROVIDED A TOTAL RETURN OF 13.29% FOR THE 
YEAR ENDED JANUARY 31, 1998. This compares to a 12.73% total return for the 
fund's benchmark,*** the Lehman Brothers Municipal Long Bond Index. Over the 
same period, the Lipper General Municipal Bond Funds: Leveraged Average 
gained 12.28%. The fund's monthly dividend remained stable at 6.31 cents per 
share throughout the 12-month reporting period.

WE ATTRIBUTE THE FUND'S PERFORMANCE LARGELY TO OUR STRATEGY OF POSITIONING THE 
PORTFOLIO TO BENEFIT FROM A DECLINE IN LONG-TERM INTEREST RATES. Entering the 
reporting period, the moderate inflation


* All returns assume reinvestment of all distributions and do not reflect sales 
charges, except the fund's total return based on market price, which does 
reflect sales charges on those distributions described in the fund's dividend 
reinvestment plan, but not on initial purchases. Past performance does not 
guarantee future results. The investment return and principal value of an 
investment will fluctuate so that fund shares, when sold, may be worth more or 
less than their original cost.

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

PORTFOLIO COMPOSITION
- --------------------------------------------------------------------------------

As a percentage of total assets on January 31, 1998.

                               [CHART]

<TABLE>
<S>                                    <C>
Housing Revenue                         14%
Nursing Home Revenue                     3%
Leasing Revenue                          2%
Other Assets                             2%
Multiple Utility Revenue                 3%
Water/Sewer/Pollution Control Revenue    4%
General Obligations                     33%
Hospital Revenue                        20%
Sales/Excise Tax Revenue                 1%
Electric Revenue                         6%
Education Revenue                       11%
Health Service/HMO Revenue               1%
</TABLE>

Municipal inverse floating rate securities account for 3% of the fund's total 
assets.

*** This symbol represents a graduation cap, used throughout this report to 
indicate terms defined in the glossary.

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

          1998 Annual Report   2   Minnesota Municipal Income Portfolio

<PAGE>

PORTFOLIO MANAGERS' LETTER (CONTINUED)
- --------------------------------------------------------------------------------

[PHOTO]
RON REUSS, ISFA,
shares responsibility  for the management of Minnesota Municipal Income 
Portfolio. He has 30 years of financial experience.
- --------------------------------------------------------------------------------


outlook increased the probability that bond yields were likely to decline. 
Accordingly, we kept the fund's effective duration*** toward the long end of our
target range to benefit from rising bond prices. (We discuss the fund's 
effective duration strategy in greater detail later in this letter.) While we 
recognized that the U.S. economy was growing at a solid pace and that the labor 
market remained tight, we believed that the financial crisis in Asia could 
provide enough of a drag on domestic growth to offset some of the inflationary 
pressures that typically build during the latter stages of an economic 
expansion.

AS EVENTS UNFOLDED, THE ASIAN CRISIS DID HELP TO PUSH LONG-TERM RATES SHARPLY 
LOWER. When the first hint of the looming turmoil in Asia appeared in July, 
yields on long-term Treasury bonds were 6.74%. By mid-January, Treasury-bond 
yields had fallen to 5.69%, as global investors sought a safe haven amid the 
chaos in Asia. Closer to home, bond buyers were reassured about the outlook for 
inflation. While municipal issues did not benefit directly from the foreign 
demand for Treasuries that accompanied the drop in Treasury yields, all fixed 
income securities compete for investment dollars on an after-tax basis among 
domestic investors. Consequently, yields on long-term municipal bonds also 
drifted lower in concert with comparable Treasury issues.

MUNICIPALITIES TOOK ADVANTAGE OF THE LOWER INTEREST RATES TO INCREASE 
REFUNDINGS. As yields dropped across the fixed income spectrum late in the year,
municipal issuers used the occasion of lower rates to refund securities with a 
higher rate. The resulting increase in the supply of municipal debt on the 
market caused tax-exempt issues to underperform Treasury securities, especially 
during December, when interest rates declined most significantly. Refundings in 
Minnesota, however, were more limited. In fact, the supply of tax-exempt issues 
in Minnesota actually contracted by about 12% from a year earlier. The reduced 
supply of Minnesota bonds helped the state's tax-exempt sector to slightly 
outperform national bonds (as represented by the Lehman Brothers Municipal Bond 
Index) over the reporting period.


*** This symbol represents a graduation cap, used throughout this report to 
indicate terms defined in the glossary.


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          1998 Annual Report   3   Minnesota Municipal Income Portfolio

<PAGE>

PORTFOLIO MANAGERS' LETTER (CONTINUED)
- --------------------------------------------------------------------------------

THE FIXED INCOME MARKET BENEFITED FROM STABLE MONETARY POLICY. Faced with little
evidence of accelerating inflation and fearful of contributing to further 
turmoil overseas, the Federal Reserve Board (Fed) kept interest rates unchanged 
after a 0.25% hike in the key Federal Funds rate*** in March 1997. Despite the 
Asian crisis, Fed policy-makers have given no hint of any imminent cut in short-
term interest rates.

THE U.S. ECONOMY CONTINUED TO GROW RAPIDLY AND WITHOUT SIGNIFICANT INFLATION. 
For all of 1997, the nation's total output of goods and services (GDP) increased
by 3.8%, the fastest growth rate since 1988. Meanwhile, unemployment fell to a 
24-year low of 4.6% late in the year. Despite the robust pace of economic 
activity, inflation remained under control. At the consumer level, prices 
increased by only 1.6% over the 12 months through January, while producer prices
actually declined during the same period. The steady stream of good economic 
news put Americans in an ebullient mood, with consumer confidence in December 
soaring to its highest level in 28 years.

WE EXPECT THAT ECONOMIC FALLOUT FROM ASIA WILL BECOME INCREASINGLY EVIDENT LATER
THIS YEAR. As the reporting period ended, there was a growing expectation among 
investors that the impact of the Asian crisis on the U.S. economy might be less 
severe than previously feared. We believe, however, that while the effects may 
be somewhat more benign than the worst-case scenarios suggested, the full impact
of the Asian crisis will only become evident as the year unfolds. Specifically, 
we expect that reduced demand for U.S. goods in Asia, coupled with intense 
pricing pressures from imports, may pinch corporate profit margins enough to 
keep inflationary pressures in check without significant credit-tightening moves
by the Federal Reserve. In this environment, we expect long-term interest rates 
to remain within a relatively tight range around present levels, with a possible
downward bias if Asian problems more negatively impact the U.S. economy.

*** This symbol represents a graduation cap, used throughout this report to 
indicate terms defined in the glossary.


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          1998 Annual Report   4   Minnesota Municipal Income Portfolio

<PAGE>

PORTFOLIO MANAGERS' LETTER (CONTINUED)
- --------------------------------------------------------------------------------

AT THIS ADVANCED STAGE OF THE BUSINESS CYCLE, WE BELIEVE IT IS PRUDENT TO 
MAINTAIN HIGH STANDARDS OF CREDIT QUALITY IN THE PORTFOLIO. The confidence shown
by investors in the health of the domestic economy has led to a nearly 
unprecedented contraction in yield differentials between low- and high-rated 
municipal issues. At current levels, we believe that the marginal improvement in
yields offered by lower-rated debt does not provide adequate compensation to 
take on the incremental credit risk. We will continue to search for issues that 
offer the combination of compelling value and the potential for significant 
improvement in underlying fundamentals.

GIVEN OUR OUTLOOK FOR RELATIVELY STABLE INTEREST RATES, WE FORESEE MAKING ONLY 
MINOR ADJUSTMENTS TO THE PORTFOLIO'S EFFECTIVE DURATION IN COMING MONTHS. With 
the fund's effective duration near the long end of our target range, we continue
to position the portfolio to benefit from stable or falling interest rates. As 
noted earlier, we believe the most likely scenario in the fixed income market is
that long-term bond yields will remain within a relatively narrow range. If the 
highly fluid nature of the Asian crisis causes long-term interest rates to break
out of this trading range in either direction, we would adjust the fund's 
effective duration accordingly. Please note that the fund generally maintains an
effective duration that is longer than that of its benchmark to help meet its 
objective of high current income. This long duration, coupled with the fund's 
leverage from preferred stock,*** could have a negative impact on the fund's net
asset value during a rising interest rate environment. The fund's longer 
duration and leverage position could also benefit the fund during times of 
falling interest rates.

Thank you for your investment in Minnesota Municipal Income Portfolio.

Sincerely,


/s/ Douglas J. White             /s/ Ronald R. Reuss

Douglas J. White                 Ronald R. Reuss
Portfolio Manager                Portfolio Manager

*** This symbol represents a graduation cap, used throughout this report to 
indicate terms defined in the glossary.

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

          1998 Annual Report   5   Minnesota Municipal Income Portfolio

<PAGE>
Financial Statements
 
- --------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES  January 31, 1998
 ................................................................................
 
<TABLE>
<S>                                                           <C>
ASSETS:
Investments in securities at market value* (note 2) ........     $92,741,281
Cash in bank on demand deposit .............................          31,906
Accrued interest receivable ................................       1,600,708
                                                              -----------------
  Total assets .............................................      94,373,895
                                                              -----------------
 
LIABILITIES:
Preferred stock dividends payable (note 3) .................           9,852
Payable for investment securities purchased on a when-issued
  basis (note 2) ...........................................         987,740
Accrued investment management fee ..........................          27,728
Accrued remarketing agent fee ..............................           6,041
Accrued administrative fee .................................          11,883
                                                              -----------------
  Total liabilities ........................................       1,043,244
                                                              -----------------
  Net assets applicable to outstanding capital stock .......     $93,330,651
                                                              -----------------
                                                              -----------------
 
COMPOSITION OF NET ASSETS:
Capital stock and additional paid-in capital (common and
  preferred stock) .........................................     $89,146,706
Undistributed net investment income ........................         772,152
Accumulated net realized loss on investments ...............      (2,479,682)
Unrealized appreciation of investments .....................       5,891,475
                                                              -----------------
 
  Total - representing net assets applicable to capital
    stock ..................................................     $93,330,651
                                                              -----------------
                                                              -----------------
 
* Investments in securities at identified cost .............     $86,849,806
                                                              -----------------
                                                              -----------------
 
NET ASSET VALUE AND MARKET PRICE OF CAPITAL STOCK:
Net assets applicable to outstanding common stock ..........     $62,230,651
Shares of common stock outstanding (authorized 1 million
  shares of $0.01 par value) ...............................       4,146,743
Net asset value ............................................     $     15.01
Market price ...............................................     $     14.13
 
LIQUIDATION PREFERENCE OF PREFERRED STOCK (NOTE 3:)
Net assets applicable to outstanding preferred stock .......     $31,100,000
Shares of preferred stock outstanding (authorized 1 million
  shares) ..................................................           1,244
Liquidation preference per share ...........................     $    25,000
</TABLE>
 
SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  6  Minnesota Municipal Income Portfolio
<PAGE>
Financial Statements  (continued)
- ---------------------------------------------------------------------
 
STATEMENT OF OPERATIONS  For the Year Ended January 31, 1998
 ................................................................................
 
<TABLE>
<S>                                                           <C>
INCOME:
Interest ...................................................     $ 5,124,846
                                                              -----------------
 
EXPENSES (NOTE 5):
Investment management fee ..................................         316,499
Administrative fee .........................................         135,642
Remarketing agent fee ......................................          79,044
Custodian and accounting fees ..............................          60,062
Transfer agent fees ........................................          24,061
Reports to shareholders ....................................          24,813
Directors' fees ............................................          12,165
Audit and legal fees .......................................          47,574
Other expenses .............................................          27,877
                                                              -----------------
  Total expenses ...........................................         727,737
    Less expenses paid indirectly ..........................          (9,822)
                                                              -----------------
 
  Total net expenses .......................................         717,915
                                                              -----------------
 
  Net investment income ....................................       4,406,931
                                                              -----------------
 
NET REALIZED AND UNREALIZED GAINS (LOSSES) ON INVESTMENTS:
Net realized gain on investments (note 4) ..................         166,586
Net change in unrealized appreciation or depreciation of
  investments ..............................................       3,941,653
                                                              -----------------
 
  Net gain on investments ..................................       4,108,239
                                                              -----------------
 
    Net increase in net assets resulting from operations ...     $ 8,515,170
                                                              -----------------
                                                              -----------------
</TABLE>
 
SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  7  Minnesota Municipal Income Portfolio
<PAGE>
Financial Statements  (continued)
- ---------------------------------------------------------------------
 
STATEMENTS OF CHANGES IN NET ASSETS
 ................................................................................
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED          YEAR ENDED
                                                                   1/31/98             1/31/97
                                                              -----------------   -----------------
<S>                                                           <C>                 <C>
OPERATIONS:
Net investment income ......................................     $ 4,406,931         $ 4,526,520
Net realized gain on investments ...........................         166,586             435,954
Net change in unrealized appreciation or depreciation of
  investments ..............................................       3,941,653          (2,270,499)
                                                              -----------------   -----------------
 
  Net increase in net assets resulting from operations .....       8,515,170           2,691,975
                                                              -----------------   -----------------
 
DISTRIBUTIONS TO SHAREHOLDERS:
From net investment income:
  Common stock dividends ...................................      (3,160,648)         (3,141,158)
  Preferred stock dividends ................................      (1,048,680)           (987,022)
                                                              -----------------   -----------------
  Total distributions ......................................      (4,209,328)         (4,128,180)
                                                              -----------------   -----------------
 
  Total increase (decrease) in net assets ..................       4,305,842          (1,436,205)
 
Net assets at beginning of year ............................      89,024,809          90,461,014
                                                              -----------------   -----------------
 
Net assets at end of year ..................................     $93,330,651         $89,024,809
                                                              -----------------   -----------------
                                                              -----------------   -----------------
 
Undistributed net investment income ........................     $   772,152         $   582,008
                                                              -----------------   -----------------
                                                              -----------------   -----------------
</TABLE>
 
SEE ACCOMPANYING NOTES TO FINANCIAL STATEMENTS.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  8  Minnesota Municipal Income Portfolio
<PAGE>
        Notes to Financial Statements
- --------------------------------------------------------------------------------
 
(1) ORGANIZATION
 ................................
               Minnesota Municipal Income Portfolio Inc. (the fund) is
               registered under the Investment Company Act of 1940 (as amended)
               as a non-diversified, closed-end management investment company.
               The fund invests in a wide range of Minnesota municipal
               securities rated investment grade or of comparable quality when
               purchased. These securities may include municipal derivative
               securities, such as inverse floating rate and inverse
               interest-only municipal securities. Fund shares are listed on the
               American Stock Exchange under the symbol MXA.
 
(2) SUMMARY OF
    SIGNIFICANT
    ACCOUNTING
    POLICIES
 ................................
                  INVESTMENTS IN SECURITIES
               Portfolio securities for which market quotations are readily
               available are valued at current market value. If market
               quotations or valuations are not readily available, or if such
               quotations or valuations are believed to be inaccurate,
               unreliable or not reflective of market value, portfolio
               securities are valued according to procedures adopted by the
               fund's board of directors in good faith at "fair value", that is,
               a price that the fund might reasonably expect to receive for the
               security or other asset upon its current sale.
 
               The current market value of certain fixed income securities is
               provided by an independent pricing service. Fixed income
               securities for which prices are not available from an independent
               pricing service but where an active market exists are valued
               using market quotations obtained from one or more dealers that
               make markets in the securities or from a widely-used quotation
               system. Short-term securities with maturities of 60 days or less
               are valued at amortized cost, which approximates market value.
 
               Securities transactions are accounted for on the date securities
               are purchased or sold. Realized gains and losses are calculated
               on the identified-cost basis. Interest income, including
               amortization of bond discount and premium, is recorded on an
               accrual basis.
 
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          1998 Annual Report  9  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
 
               The fund concentrates its investments in Minnesota and,
               therefore, may have more credit risk related to the economic
               conditions of Minnesota than portfolios with a broader
               geographical diversification.
 
                  SECURITIES PURCHASED ON A WHEN-ISSUED BASIS
               Delivery and payment for securities that have been purchased by
               the fund on a when-issued or forward-commitment basis can take
               place a month or more after the transaction date. During this
               period, such securities do not earn interest, are subject to
               market fluctuation and may increase or decrease in value prior to
               their delivery. The fund segregates, with its custodian, assets
               with a market value equal to the amount of its purchase
               commitments. The purchase of securities on a when-issued or
               forward-commitment basis may increase the volatility of the
               fund's net asset value if the fund makes such purchases while
               remaining substantially fully invested. As of January 31, 1998,
               the fund had entered into outstanding when-issued or forward
               commitments of $987,740.
 
                  FEDERAL TAXES
               The fund intends to comply with the requirements of the Internal
               Revenue Code applicable to regulated investment companies and not
               be subject to federal income tax. Therefore, no income tax
               provision is required. The fund also intends to distribute its
               taxable net investment income and realized gains, if any, to
               avoid the payment of any federal excise taxes.
 
               Net investment income and net realized gains (losses) may differ
               for financial statement and tax purposes primarily because of
               market discount amortization. The character of distributions made
               during the year from net investment income or net realized gains
               may differ from its ultimate characterization for federal income
               tax purposes. In addition, due to the timing of dividend
               distributions,
 
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          1998 Annual Report  10  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
               the fiscal year in which amounts are distributed may differ from
               the year that the income or realized gains (losses) were recorded
               by the fund.
 
               On the statement of assets and liabilities, as a result of
               permanent book-to-tax differences, a reclassification adjustment
               has been made to decrease undistributed net investment income and
               decrease accumulated net realized loss on investments by $7,459.
 
                  DISTRIBUTIONS TO SHAREHOLDERS
               Distributions from net investment income are made monthly for
               common shareholders and weekly for preferred shareholders. Common
               stock distributions are recorded as of the close of business on
               the ex-dividend date and preferred stock dividends are accrued
               daily. Net realized gains distributions, if any, will be made at
               least annually. Distributions are payable in cash or, for common
               shareholders pursuant to the fund's dividend reinvestment plan,
               reinvested in additional shares of the fund's common stock. Under
               the plan, common shares will be purchased in the open market.
 
                  USE OF ESTIMATES
               The preparation of financial statements in conformity with
               generally accepted accounting principles requires management to
               make estimates and assumptions that affect the reported amounts
               in the financial statements. Actual results could differ from
               these estimates.
 
(3) REMARKETED
    PREFERRED
    STOCK
 ................................
               Minnesota Municipal Income Portfolio Inc. has issued and, as of
               January 31, 1998, has outstanding 1,244 shares of remarketed
               preferred stock (622 shares in class "M" and 622 shares in class
               "W") (RP) with a liquidation preference of $25,000 per share. The
               dividend rate on the RP is adjusted every seven days (on Mondays
               for class "M" and on Wednesdays for class "W"), as determined by
               the remarketing agent. On January 31, 1998, the dividend rates
               were 2.90% and 2.875% for class "M" and "W," respectively.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  11  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
 
               RP is a registered trademark of Merrill Lynch & Company.
 
(4) INVESTMENT
    SECURITY
    TRANSACTIONS
 ................................
               Cost of purchases and proceeds from sales of securities, other
               than temporary investments in short-term securities for the year
               ended January 31, 1998 aggregated $26,832,626 and $22,419,086,
               respectively.
 
(5) EXPENSES
 ................................
                  INVESTMENT MANAGEMENT AND ADMINISTRATIVE FEES
               The fund has entered into the following agreements with Piper
               Capital Management Incorporated (the advisor and administrator):
 
               The investment advisory agreement provides the advisor with a
               monthly investment management fee equal to an annual rate of
               0.35% of the fund's average weekly net assets (computed by
               subtracting liabilities, which exclude preferred stock, from the
               value of the total assets of the fund). For its fee, the advisor
               provides investment advice and conducts the management and
               investment activities of the fund.
 
               The administration agreement provides the administrator with a
               monthly fee in an amount equal to an annual rate of 0.15% of the
               fund's average weekly net assets (computed by subtracting
               liabilities, which exclude preferred stock, from the value of the
               total assets of the fund). For its fee, the administrator
               provides reporting, regulatory and record-keeping services for
               the fund.
 
                  REMARKETING AGENT FEE
               The fund has entered into a remarketing agent agreement with
               Merrill Lynch, Pierce, Fenner & Smith (the remarketing agent).
               The remarketing agreement provides the remarketing agent with a
               monthly fee in an amount equal to an annual rate of 0.25% of the
               fund's average amount of RP outstanding. For its fee, the
               remarketing agent will remarket shares of RP tendered to it on
               behalf of shareholders and will determine the applicable dividend
               rate for each seven-day dividend period.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  12  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
 
                  OTHER FEES AND EXPENSES
               In addition to the investment management, administrative and
               remarketing agent fees, the fund is responsible for paying most
               other operating expenses including: outside directors' fees and
               expenses; custodian fees; registration fees; printing and
               shareholder reports; transfer agent fees and expenses; legal,
               auditing and accounting services; insurance; interest; taxes and
               other miscellaneous expenses.
 
               Expenses paid indirectly represent a reduction of custodian fees
               for earnings on miscellaneous cash balances maintained by the
               fund.
 
(6) CAPITAL LOSS
    CARRYOVER
 ................................
               For federal income tax purposes, the fund had capital loss
               carryovers at January 31, 1998, which, if not offset by
               subsequent capital gains, will expire on the fund's fiscal
               year-ends as indicated below. It is unlikely the board of
               directors will authorize a distribution of any net realized
               capital gains until the available capital loss carryovers have
               been offset or expire.
 
<TABLE>
<CAPTION>
                                          CAPITAL LOSS
                                            CARRYOVER       EXPIRATION
                                          -------------   ---------------
<S>                                       <C>             <C>
                                            $2,064,623          2003
                                               415,059          2004
                                          -------------
                                            $2,479,682
                                          -------------
                                          -------------
</TABLE>
 
(7) PENDING
    ACQUISITION
 ................................
               On December 15,1997, Piper Jaffray Companies, Inc., the parent
               company of the fund's investment advisor, announced that it had
               entered into an agreement to be acquired by U.S. Bancorp. It is
               anticipated that this acquisition will be completed in the second
               quarter of 1998, subject to regulatory approval, the approval of
               Piper Jaffray Companies shareholders and the satisfaction of
               customary closing conditions.
 
               U.S. Bancorp is a multi-state bank holding company headquartered
               in Minneapolis, Minnesota with a geographic service area spanning
               17 states. As of December 31, 1997, U.S. Bancorp was the 15th
               largest U.S. commercial bank holding
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  13  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
               company, with assets of nearly $71.3 billion. U.S. Bank National
               Association ("U.S. Bank"), a wholly owned subsidiary of U.S.
               Bancorp, currently acts as the investment advisor to 32 mutual
               funds (the "First American Funds"). As of December 31, 1997, U.S.
               Bank, acting through its First American Asset Management group,
               managed more than $55 billion in assets, including approximately
               $20.5 billion in assets of the First American Funds.
 
               Under the Investment Company Act of 1940, as amended (the "1940
               Act"), consummation of the acquisition of Piper Jaffray Companies
               by U.S. Bancorp will result in the assignment and automatic
               termination of the fund's investment advisory agreement with
               Piper Capital Management Incorporated. The 1940 Act requires that
               any new investment advisory agreement for the fund be approved by
               the fund's board of directors and shareholders.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  14  Minnesota Municipal Income Portfolio
<PAGE>
           Notes to Financial Statements (continued)
- --------------------------------------------------------------------------------
 
(8) FINANCIAL
    HIGHLIGHTS
 ................................
               Per-share data for a share of common stock outstanding throughout
               each period and selected information for each period are as
               follows:
 
MINNESOTA MUNICIPAL INCOME PORTFOLIO
 
<TABLE>
<CAPTION>
                                              Year Ended January 31,          Period
                                          ------------------------------      Ended
                                           1998    1997    1996    1995     1/31/94(g)
                                          ------  ------  ------  ------  --------------
<S>                                       <C>     <C>     <C>     <C>     <C>
PER-SHARE DATA
Net asset value, common stock, beginning
  of period .                             $13.97  $14.32  $11.96  $14.67      $14.13
                                          ------  ------  ------  ------  --------------
Operations:
  Net investment income ................    1.06    1.09    1.06    1.09        0.55
  Net realized and unrealized gains
    (losses) on investments ............    0.99   (0.44)   2.40   (2.74)       0.63
                                          ------  ------  ------  ------  --------------
    Total from operations ..............    2.05    0.65    3.46   (1.65)       1.18
                                          ------  ------  ------  ------  --------------
Distributions to shareholders from net
  investment income:
  Paid to common shareholders ..........   (0.76)  (0.76)  (0.82)  (0.83)      (0.42)
  Paid to preferred shareholders .......   (0.25)  (0.24)  (0.28)  (0.23)      (0.08)
                                          ------  ------  ------  ------  --------------
    Total distributions to
      shareholders .....................   (1.01)  (1.00)  (1.10)  (1.06)      (0.50)
                                          ------  ------  ------  ------  --------------
Offering costs and underwriting
  discounts associated with the
  remarketed preferred stock ...........      --      --      --      --       (0.14)
                                          ------  ------  ------  ------  --------------
Net asset value, common stock, end of
  period ...............................  $15.01  $13.97  $14.32  $11.96      $14.67
                                          ------  ------  ------  ------  --------------
                                          ------  ------  ------  ------  --------------
Market value, common stock, end of
  period ...............................  $14.13  $12.50  $12.88  $11.88      $15.50
                                          ------  ------  ------  ------  --------------
                                          ------  ------  ------  ------  --------------
SELECTED INFORMATION
Total return, common stock, net asset
  value (a) ............................   13.29%   3.09%  27.27% (12.69)%       6.86%
Total return, common stock, market value
  (b) ..................................   19.60%   3.19%  15.74% (18.11)%       6.18%
Net assets at end of period (in
  millions) ............................  $   93  $   89  $   90  $   81      $   92
Ratio of expenses to average weekly net
  assets applicable to common stock
  (c) ..................................    1.23%   1.26%   1.28%   1.27%       1.13%(h)
Ratio of net investment income to
  average weekly net assets applicable
  to common stock (d)(e) ...............    5.66%   6.25%   5.81%   7.00%       6.54%(h)
Portfolio turnover rate (excluding
  short-term securities) ...............      26%     25%     13%     49%         55%
Remarketed preferred stock outstanding
  end of period (in millions) ..........  $   31  $   31  $   31  $   31      $   31
Asset coverage ratio (f) ...............     300%    286%    291%    260%        296%
</TABLE>
 
(a)  ASSUMES REINVESTMENT OF DISTRIBUTIONS AT NET ASSET VALUE AND DOES NOT
     REFLECT A SALES CHARGE.
(b)  ASSUMES REINVESTMENT OF DISTRIBUTIONS AT ACTUAL PRICES PURSUANT TO THE
     FUND'S DIVIDEND REINVESTMENT PLAN.
(c)  RATIO OF EXPENSES TO TOTAL AVERAGE WEEKLY NET ASSETS IS 0.80%, 0.82%,
     0.82%, 0.79% AND 0.69% IN FISCAL YEARS 1998, 1997, 1996, 1995 AND 1994,
     RESPECTIVELY. DIVIDEND PAYMENTS TO PREFERRED SHAREHOLDERS ARE NOT
     CONSIDERED AN EXPENSE.
(d)  RATIO REFLECTS TOTAL NET INVESTMENT INCOME LESS DIVIDENDS PAID TO PREFERRED
     SHAREHOLDERS FROM NET INVESTMENT INCOME DIVIDED BY AVERAGE WEEKLY NET
     ASSETS APPLICABLE TO COMMON STOCK.
(e)  RATIO OF NET INVESTMENT INCOME TO TOTAL AVERAGE WEEKLY NET ASSETS IS 4.87%,
     5.16%, 5.06%, 5.54% AND 4.66% IN FISCAL YEARS 1998, 1997, 1996, 1995, AND
     1994, RESPECTIVELY.
(f)  REPRESENTS TOTAL NET ASSETS DIVIDED BY REMARKETED PREFERRED STOCK.
(g)  COMMENCEMENT OF OPERATIONS WAS JUNE 25, 1993.
(h)  ANNUALIZED.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  15  Minnesota Municipal Income Portfolio
<PAGE>
Investments in Securities
- ---------------------------------------------------------------------
 
<TABLE>
<CAPTION>
MINNESOTA MUNICIPAL INCOME PORTFOLIO                             January 31, 1998
 .......................................................................................
 
                                                            Principal          Market
Description of Security                                      Amount          Value (a)
- ---------------------------------------------------------  -----------      ------------
<S>                                                        <C>              <C>
(PERCENTAGES OF EACH INVESTMENT CATEGORY RELATE TO TOTAL NET ASSETS)
 
MUNICIPAL LONG-TERM SECURITIES (98.8%):
  MUNICIPAL BONDS (95.6%):
    EDUCATION REVENUE (10.7%):
      Higher Education Facility-Carleton College
        (Callable 11/01/07 at 100), 5.30%-5.40%,
        11/1/13-11/1/14 .................................  $ 2,500,000      $  2,606,470
      Higher Education Facility-St. John's University
        (Callable 10/01/07 at 100), 5.35%, 10/1/17 ......    1,500,000         1,539,750
      Higher Education Facility-Carleton College
        (Callable 5/1/06 at 100), 5.75%, 11/1/12 ........    2,000,000         2,142,120
      Higher Education Facility-Macalester College
        (Callable 3/1/05 at 100), 5.50%-5.55%,
        3/1/12-3/1/16 ...................................      500,000           518,043
      Higher Education Facility-St. Benedict College
        (Callable 3/1/04 at 100), 6.20%-6.38%,
        3/1/14-3/1/20 ...................................    1,050,000         1,109,769
      Higher Education Facility-St. Mary's College
        (Callable 10/1/03 at 101), 6.10%, 10/1/16 .......      500,000           523,290
      Higher Education Facility-St. Thomas University
        (Callable 4/1/07 at 100), 5.38%, 4/1/18 .........    1,050,000         1,080,167
      Higher Education Facility-St. Thomas University
        (Callable 9/1/03 at 101), 5.50%-5.60%,
        9/1/08-9/1/14 ...................................      430,000           448,089
                                                                            ------------
                                                                               9,967,698
                                                                            ------------
 
    ELECTRIC REVENUE (6.3%):
      Northern Minnesota Municipal Power Agency (Callable
        1/1/09 at 102), 5.40%, 1/1/15 ...................    1,000,000(e)      1,032,170
      Western Minnesota Municipal Power Agency (AMBAC)
        (Callable 1/1/06 at 102), 5.40%-5.50%,
        1/1/09-1/1/12 ...................................    4,500,000         4,820,635
                                                                            ------------
                                                                               5,852,805
                                                                            ------------
 
    GENERAL OBLIGATIONS (31.6%):
      Albany Independent School District (Callable 2/1/08
        at 100), 5.00%, 2/1/16 ..........................    1,220,000         1,221,903
      Anoka County (Callable 6/1/03 at 102), 6.10%,
        6/1/13 ..........................................      500,000           534,585
      Burnsville Independent School District (Callable
        2/1/06 at 100), 4.88%, 2/1/13 ...................    2,000,000         2,008,540
      Chaska Independent School District (Callable 2/1/06
        at 100), 6.00%, 2/1/15 ..........................    2,725,000         2,940,166
      Hawley Independent School District (Callable 2/1/06
        at 100), 5.75%, 2/1/17 ..........................    1,000,000         1,044,280
      Hennepin County General Obligation, 4.30%,
        12/1/03 .........................................    1,000,000         1,016,470
</TABLE>
 
SEE ACCOMPANYING NOTES TO INVESTMENTS IN SECURITIES.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  16  Minnesota Municipal Income Portfolio
<PAGE>
Investments in Securities (continued)
- ---------------------------------------------------------------------
 
MINNESOTA MUNICIPAL INCOME PORTFOLIO
(CONTINUED)
 
<TABLE>
<CAPTION>
                                                            Principal          Market
Description of Security                                      Amount          Value (a)
- ---------------------------------------------------------  -----------      ------------
<S>                                                        <C>              <C>
      Itasca County Minnesota Independent School District
        (MBIA) (Callable 2/1/05 at 100), 5.25%,
        2/1/11 ..........................................  $ 2,710,000      $  2,811,164
      Minneapolis General Obligation (Callable 9/1/05 at
        100), 5.20%, 3/1/13 .............................    3,750,000         3,858,675
      Osseo Independent School District, 5.59%,
        2/1/13 ..........................................    2,000,000         2,091,380
      Rosemount General Obligation (Callable 4/1/06 at
        100), 5.75%, 4/1/13 .............................    1,000,000         1,064,200
      State General Obligation, 4.63%, 8/1/03 ...........    2,000,000         2,060,200
      State General Obligation (Callable 8/1/03 at 100),
        5.40%, 8/1/12 ...................................    4,500,000         4,670,595
      State General Obligation (Callable 8/1/07 at 100),
        5.00%, 8/1/17 ...................................    1,000,000         1,001,500
      Wayzata Minnesota Independent School District
        (Callable 2/1/07 at 100), 5.50%, 2/1/17 .........    3,000,000         3,132,000
                                                                            ------------
                                                                              29,455,658
                                                                            ------------
 
    HEALTH SERVICE/HMO (0.6%):
      Duluth Clinic Health Care Facilities (AMBAC)
        (Callable 11/1/02 at 102), 6.30%, 11/1/22 .......      500,000           551,875
                                                                            ------------
 
    HOSPITAL REVENUE (18.4%):
      Bemidji Health Care Facility-North Country Health
        System (Callable 9/1/06 at 102), 5.63%,
        9/1/15 ..........................................    1,760,000         1,842,122
      Breckenridge Health Facility, 5.21%, 11/15/13 .....    4,120,000         4,238,903
      Duluth Health Facility-Benedictine Health System
        (Callable 2/15/03 at 102), 6.00%, 2/15/12 .......    1,800,000         1,957,824
      Fergus Falls Health Care-Lake Region Hospital
        (Callable 9/1/03 at 102), 6.50%, 9/1/18 .........    1,000,000         1,078,800
      Minneapolis Health Care-Fairview Hospital (MBIA)
        (Callable 11/15/03 at 102), 5.25%, 11/15/13 .....      500,000           513,140
      Red Wing Health Care Facility-River Region
        (Callable 9/1/03 at 102), 6.50%, 9/1/22 .........    1,000,000         1,082,350
      St. Paul Housing Redevelopment Authority-Healtheast
        Project (Callable 11/1/03 at 102), 6.63%,
        11/1/17 .........................................    6,000,000         6,471,780
                                                                            ------------
                                                                              17,184,919
                                                                            ------------
</TABLE>
 
SEE ACCOMPANYING NOTES TO INVESTMENTS IN SECURITIES.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  17  Minnesota Municipal Income Portfolio
<PAGE>
Investments in Securities (continued)
- ---------------------------------------------------------------------
 
MINNESOTA MUNICIPAL INCOME PORTFOLIO
(CONTINUED)
 
<TABLE>
<CAPTION>
                                                            Principal          Market
Description of Security                                      Amount          Value (a)
- ---------------------------------------------------------  -----------      ------------
<S>                                                        <C>              <C>
    HOUSING REVENUE (14.3%):
      Brooklyn Center, Ponds Family Housing Project
        (Callable 1/1/04 at 102), 5.90%, 1/1/20 .........  $ 1,050,000      $  1,071,221
      Burnsville, Summit Park Apartments (Callable 7/1/03
        at 102), 5.75%, 7/1/11 ..........................    1,000,000         1,032,830
      Coon Rapids, Multifamily Development-Woodland Apts.
        (FHA) (Callable 12/1/03 at 100), 5.63%,
        12/1/09 .........................................    3,175,000         3,248,343
      Minneapolis and St. Paul, Housing and Redevelopment
        Health Care System-Childrens Health Care (FSA)
        (Callable 8/15/05 at 102), 5.70%, 8/15/16 .......      500,000           528,935
      New Hope, Multifamily Housing Project (Callable
        1/1/06 at 102), 6.05%, 1/1/17 ...................      450,000           472,212
      St. Louis Park, Multifamily Housing Project
        (Callable 12/1/04 at 102), 6.15%, 12/1/16 .......      500,000           524,390
      State Housing and Finance Agency (Callable 1/1/04
        at 102), 6.30%, 7/1/25 ..........................      745,000           791,153
      State Housing and Finance Agency (Callable 7/1/03
        at 102), 5.95%, 1/1/17 ..........................    3,120,000         3,239,059
      State Housing and Finance Agency (Callable 8/1/03
        at 102), 5.70%-6.10%, 8/1/07-8/1/22 .............    2,325,000         2,415,565
                                                                            ------------
                                                                              13,323,708
                                                                            ------------
 
    IDR - MISCELLANEOUS PROJECTS (0.3%):
      Duluth Seaway Port Authority, Cargill Inc. Project
        (Callable 12/1/03 at 102), 5.75%, 12/1/16 .......      300,000(d)        314,733
                                                                            ------------
 
    LEASING REVENUE (2.4%):
      Benton County Jail Facility (FSA) (Callable 2/1/05
        at 100), 5.70%, 2/1/13-2/1/16 ...................      900,000           949,546
      Waconia Housing Redevelopment Authority-Public
        Project (Callable 1/1/03 at 100), 5.70%-5.75%,
        1/1/10-1/1/15 ...................................    1,240,000         1,276,121
                                                                            ------------
                                                                               2,225,667
                                                                            ------------
 
    MULTIPLE UTILITY REVENUE (2.9%):
      Owatonna Public Utility Revenue (AMBAC) (Callable
        1/1/04 at 100), 5.45%, 1/1/16 ...................    2,600,000         2,669,914
                                                                            ------------
</TABLE>
 
SEE ACCOMPANYING NOTES TO INVESTMENTS IN SECURITIES.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  18  Minnesota Municipal Income Portfolio
<PAGE>
Investments in Securities (continued)
- ---------------------------------------------------------------------
 
MINNESOTA MUNICIPAL INCOME PORTFOLIO
(CONTINUED)
 
<TABLE>
<CAPTION>
                                                            Principal          Market
Description of Security                                      Amount          Value (a)
- ---------------------------------------------------------  -----------      ------------
<S>                                                        <C>              <C>
    NURSING HOME REVENUE (3.4%):
      Red Wing Elderly Housing-River Region (Callable
        9/1/03 at 102), 6.50%, 9/1/22 ...................  $ 1,500,000      $  1,623,525
      Waconia Housing Redevelopment Authority (Callable
        6/4/03 at 102), 6.00%, 6/1/14 ...................    1,500,000         1,569,495
                                                                            ------------
                                                                               3,193,020
                                                                            ------------
 
    SALES TAX REVENUE (0.5%):
      Minneapolis Convention Center Facilities (Callable
        4/1/04 at 100), 5.40%, 4/1/12 ...................      500,000           519,280
                                                                            ------------
 
    WATER/POLLUTION CONTROL REVENUE (4.2%):
      Minnesota Public Facilities Authority Water
        Pollution Control Revenue (Callable 3/1/06 at
        100), 4.75%-5.35%, 3/1/10-3/1/12 ................    2,900,000         2,967,338
      Minnesota Public Facilities Authority Water
        Pollution Control Revenue (Callable 3/1/07 at
        100), 5.00%, 3/1/16 .............................    1,000,000         1,004,310
                                                                            ------------
                                                                               3,971,648
                                                                            ------------
 
        Total Municipal Bonds
          (cost: $84,055,421)  ..........................                     89,230,925
                                                                            ------------
 
  MUNICIPAL DERIVATIVE SECURITIES (3.2%):
    INVERSE FLOATER (3.2%):
      Duluth Health Facility-Benedictine Health System,
        Series E-2, 9.19%, 2/15/12 ......................      925,000(b)(d)    1,143,531
      Osseo Independent School District (FGIC), 8.19%,
        2/1/14 ..........................................      775,000(b)(d)      864,125
      Rochester Health Care, 8.92%, 11/15/10 ............      740,000(b)(d)    1,002,700
                                                                            ------------
 
        Total Municipal Derivative Securities
          (cost: $2,294,385)  ...........................                      3,010,356
                                                                            ------------
 
        Total Municipal Long-Term Securities
          (cost: $86,349,806)  ..........................                     92,241,281
                                                                            ------------
</TABLE>
 
SEE ACCOMPANYING NOTES TO INVESTMENTS IN SECURITIES.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  19  Minnesota Municipal Income Portfolio
<PAGE>
Investments in Securities (continued)
- ---------------------------------------------------------------------
 
MINNESOTA MUNICIPAL INCOME PORTFOLIO
(CONTINUED)
 
<TABLE>
<CAPTION>
                                                            Principal          Market
Description of Security                                      Amount          Value (a)
- ---------------------------------------------------------  -----------      ------------
<S>                                                        <C>              <C>
MUNICIPAL SHORT-TERM SECURITIES (0.6%):
      Mankato, MN, 3.40%, 2/1/18
        (cost: $500,000) ................................  $   500,000(c)   $    500,000
                                                                            ------------
 
        Total Investments in Securities
          (cost: $86,849,806) (f)  ......................                   $ 92,741,281
                                                                            ------------
                                                                            ------------
</TABLE>
 
NOTES TO INVESTMENTS IN SECURITIES:
(a)  SECURITIES ARE VALUED IN ACCORDANCE WITH PROCEDURES DESCRIBED IN NOTE 2 TO
     THE FINANCIAL STATEMENTS.
(b)  PORTFOLIO ABBREVIATIONS AND DEFINITIONS:
         INVERSE FLOATER - REPRESENTS SECURITIES THAT PAY INTEREST AT RATES THAT
          INCREASE (DECREASE) IN THE SAME MAGNITUDE AS, OR IN A MULTIPLE OF, A
          DECREASE (INCREASE) IN THE MARKET RATE PAID ON A RELATED, FLOATING
          RATE SECURITY. INTEREST RATES DISCLOSED ARE IN EFFECT ON JANUARY 31,
          1998.
(c)  FLOATING OR VARIABLE RATE OBLIGATION MATURING IN MORE THAN ONE YEAR. THE
     INTEREST RATE, WHICH IS BASED ON SPECIFIC, OR AN INDEX OF, MARKET INTEREST
     RATES, IS SUBJECT TO CHANGE PERIODICALLY AND IS THE EFFECTIVE RATE ON
     JANUARY 31, 1998. THIS INSTRUMENT MAY ALSO HAVE A DEMAND FEATURE WHICH
     ALLOWS THE RECOVERY OF PRINCIPAL AT ANY TIME, OR AT SPECIFIED INTERVALS NOT
     EXCEEDING ONE YEAR, ON UP TO 30 DAYS' NOTICE. MATURITY DATE SHOWN
     REPRESENTS FINAL MATURITY.
(d)  SECURITIES PURCHASED AS PART OF A PRIVATE PLACEMENT AND MAY NOT BE SOLD TO
     THE PUBLIC. THESE SECURITIES ARE CONSIDERED ILLIQUID. THE FUND IS NOT
     LIMITED IN ITS ABILITY TO INVEST IN ILLIQUID SECURITIES. AT JANUARY 31,
     1998, THE AGGREGATE VALUE OF THESE INVESTMENTS WAS $3,325,089 OR 3.6% OF
     TOTAL NET ASSETS. INFORMATION REGARDING THESE SECURITIES IS AS FOLLOWS:
 
<TABLE>
<CAPTION>
                        SECURITY                              PAR      DATE ACQUIRED   COST BASIS
- ---------------------------------------------------------  ---------  ---------------  -----------
<S>                                                        <C>        <C>              <C>
DULUTH SEAWAY PORT AUTHORITY, CARGILL INC. PROJECT         $ 300,000         11/93      $ 300,000
DULUTH HEALTH FACILITY-BENEDICTINE HEALTH SYSTEM             925,000          5/94        881,924
OSSEO INDEPENDENT SCHOOL DISTRICT                            775,000          5/94        687,275
ROCHESTER HEALTH CARE                                        740,000          5/94        725,185
</TABLE>
 
(e)  ON JANUARY 31, 1998, THE TOTAL COST OF INVESTMENTS PURCHASED ON A
     WHEN-ISSUED OR FORWARD COMMITMENT BASIS WAS $987,740.
(f)  ON JANUARY 31, 1998, THE COST OF INVESTMENTS IN SECURITIES FOR FEDERAL
     INCOME TAX PURPOSES WAS $86,733,489. THE AGGREGATE GROSS UNREALIZED
     APPRECIATION AND DEPRECIATION OF INVESTMENTS IN SECURITIES BASED ON THIS
     COST WERE AS FOLLOWS:
 
<TABLE>
      <S>                                   <C>
      GROSS UNREALIZED APPRECIATION ......  $  6,007,792
      GROSS UNREALIZED DEPRECIATION ......            --
                                            ------------
        NET UNREALIZED APPRECIATION ......  $  6,007,792
                                            ------------
                                            ------------
</TABLE>
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  20  Minnesota Municipal Income Portfolio
<PAGE>
Independent Auditors' Report
- --------------------------------------------------------------------------------
 
THE BOARD OF DIRECTORS AND SHAREHOLDERS
MINNESOTA MUNICIPAL INCOME PORTFOLIO INC.:
 
We have audited the accompanying statement of assets and liabilities, including
the schedule of investments in securities, of Minnesota Municipal Income
Portfolio Inc. as of January 31, 1998, the related statement of operations for
the year then ended, the statements of changes in net assets for each of the
years in the two-year period ended January 31, 1998, and the financial
highlights presented in note 8 to the financial statements. These financial
statements and the financial highlights are the responsibility of the fund's
management. Our responsibility is to express an opinion on these financial
statements and the financial highlights based on our audits.
 
We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements and the financial
highlights are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements. Investment securities held in custody are confirmed to us by the
custodian. As to securities purchased but not received, we request confirmations
from brokers and, where replies are not received, we carry out other appropriate
auditing procedures. An audit also includes assessing the accounting principles
used and significant estimates made by management, as well as evaluating the
overall financial statement presentation. We believe that our audits provide a
reasonable basis for our opinion.
 
In our opinion, the financial statements and the financial highlights referred
to above present fairly, in all material respects, the financial position of
Minnesota Municipal Income Portfolio Inc. as of January 31, 1998, and the
results of its operations, the changes in its net assets and the financial
highlights for the periods stated in the first paragraph above, in conformity
with generally accepted accounting principles.
 
KPMG Peat Marwick LLP
Minneapolis, Minnesota
March 6, 1998
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  21  Minnesota Municipal Income Portfolio
<PAGE>
        Federal Income Tax Information
- --------------------------------------------------------------------------------
 
               The following per-share information describes the federal tax
               treatment of distributions made during the fiscal year. Exempt-
               interest dividends are exempt from federal income tax and should
               not be included in your gross income, but need to be reported on
               your income tax return for informational purposes. Please consult
               a tax advisor on how to report these distributions at the state
               and local levels.
 
                  COMMON STOCK INCOME DISTRIBUTIONS
                  (INCOME FROM TAX-EXEMPT SECURITIES, 99.36% QUALIFYING AS
                  EXEMPT-INTEREST DIVIDENDS)
 
<TABLE>
<CAPTION>
PAYABLE DATE                               AMOUNT
- ----------------------------------------  ---------
<S>                                       <C>
February 26, 1997 ......................  $0.063125
March 26, 1997 .........................   0.063125
April 23, 1997 .........................   0.063125
May 28, 1997 ...........................   0.063125
June 25, 1997 ..........................   0.063125
July 23, 1997 ..........................   0.063125
August 27, 1997 ........................   0.063125
September 24, 1997 .....................   0.063125
October 29, 1997 .......................   0.063125
November 24, 1997 ......................   0.067825
December 17, 1997 ......................   0.063125
January 12, 1998 .......................   0.063125
                                          ---------
    Total ..............................  $0.762200
                                          ---------
                                          ---------
</TABLE>
 
                  PREFERRED STOCK INCOME DISTRIBUTIONS
                  (INCOME FROM TAX-EXEMPT SECURITIES, 99.36% QUALIFYING AS
                  EXEMPT-INTEREST DIVIDENDS)
 
<TABLE>
<CAPTION>
                                          AMOUNT
                                          -------
<S>                                       <C>
Total class "M" ........................  $841.63
Total class "W" ........................  $844.35
</TABLE>
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  22  Minnesota Municipal Income Portfolio
<PAGE>
        Shareholder Update
- --------------------------------------------------------------------------------
 
                  ANNUAL MEETING RESULTS
               An annual meeting of the fund's shareholders was held on August
               20, 1997. Each matter voted upon at that meeting, as well as the
               number of votes cast for, against or withheld, the number of
               abstentions, and the number of broker non-votes with respect to
               such matters, are set forth below.
 
               (1) The fund's preferred shareholders elected the following
                   directors:
 
<TABLE>
<CAPTION>
                                             SHARES       SHARES WITHHOLDING
                                           VOTED "FOR"    AUTHORITY TO VOTE
                                          -------------   ------------------
<S>                                       <C>             <C>
David T. Bennett .......................       739                 4
William H. Ellis .......................       739                 4
</TABLE>
 
               (2) The fund's preferred and common shareholders, voting as a
                   class, elected the following directors:
 
<TABLE>
<CAPTION>
                                             SHARES       SHARES WITHHOLDING
                                           VOTED "FOR"    AUTHORITY TO VOTE
                                          -------------   ------------------
<S>                                       <C>             <C>
Jaye F. Dyer ...........................    2,439,353           30,568
Karol D. Emmerich ......................    2,440,215           29,707
Luella G. Goldberg .....................    2,439,881           30,041
David A. Hughey ........................    2,440,215           29,707
George Latimer .........................    2,437,015           32,907
</TABLE>
 
               (3) The fund's preferred and common shareholders, voting as a
                   class, ratified the selection by a majority of the
                   independent members of the fund's Boards of Directors of KPMG
                   Peat Marwick LLP as the independent public accountants for
                   the fund for the fiscal year ending January 31, 1998. The
                   following votes were cast regarding this matter:
 
<TABLE>
<CAPTION>
   SHARES
   VOTED          SHARES                        BROKER
   "FOR"      VOTED "AGAINST"    ABSTENTIONS   NON-VOTES
 ----------  -----------------   -----------   ---------
 <S>         <C>                 <C>           <C>
 2,451,163         2,957            15,802        --
</TABLE>
 
                  TERMS AND CONDITIONS OF THE DIVIDEND REINVESTMENT PLAN
               As a shareholder, you may choose to participate in the Dividend
               Reinvestment Plan. It's a convenient and economical way to buy
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  23  Minnesota Municipal Income Portfolio
<PAGE>
           Shareholder Update (continued)
- --------------------------------------------------------------------------------
               additional shares of the fund by automatically reinvesting
               dividends and capital gains. The plan is administered by
               Investors Fiduciary Trust Company (IFTC), the plan agent.
 
                  ELIGIBILITY/PARTICIPATION
               You may join the plan at any time. Reinvestment of distributions
               will begin with the next distribution paid, provided your request
               is received at least 10 days before the record date for that
               distribution.
 
               If your shares are in certificate form, you may join the plan
               directly and have your distributions reinvested in additional
               shares of the fund. To enroll in this plan, call IFTC at
               1-800-543-1627. If your shares are registered in your brokerage
               firm's name or another name, ask the holder of your shares how
               you may participate.
 
               Banks, brokers or nominees, on behalf of their beneficial owners
               who wish to reinvest dividend and capital gains distributions,
               may participate in the plan by informing IFTC at least 10 days
               before each share's dividend and/or capital gains distribution.
 
                  PLAN ADMINISTRATION
               Beginning no more than five business days before the dividend
               payment date, IFTC will buy shares of the fund on the New York
               Stock Exchange (NYSE) or elsewhere on the open market.
 
               The fund will not issue any new shares in connection with the
               plan. All reinvestments will be at a market price plus a pro rata
               share of any brokerage commissions, which may be more or less
               than the fund's net asset value per share. The number of shares
               allocated to you is determined by dividing the amount of the
               dividend or distribution by the applicable price per share.
 
               There is no direct charge for reinvestment of dividends and
               capital gains, since IFTC fees are paid for by the fund. However,
               each participant pays a pro rata portion of the brokerage
               commissions. Brokerage charges are expected to be lower than
               those for individual transactions because shares are purchased
               for all
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  24  Minnesota Municipal Income Portfolio
<PAGE>
           Shareholder Update (continued)
- --------------------------------------------------------------------------------
               participants in blocks. As long as you continue to participate in
               the plan, distributions paid on the shares in your account will
               be reinvested.
 
               IFTC maintains accounts for plan participants holding shares in
               certificate form and will furnish written confirmation of all
               transactions, including information you need for tax records.
               Reinvested shares in your account will be held by IFTC in
               noncertificated form in your name.
 
                  TAX INFORMATION
               Distributions invested in additional shares of the fund are
               subject to income tax, just as they would be if received in cash.
               Shareholders, as required by the Internal Revenue Service, will
               receive Form 1099 regarding the federal tax status of the prior
               year's distributions.
 
                  PLAN WITHDRAWAL
               If you hold your shares in certificate form, you may terminate
               your participation in the plan at any time by giving written
               notice to IFTC. If your shares are registered in your brokerage
               firm's name, you may terminate your participation via verbal or
               written instructions to your investment professional. Written
               instructions should include your name and address as they appear
               on the certificate or account.
 
               If notice is received at least 10 days before the record date,
               all future distributions will be paid directly to the shareholder
               of record.
 
               If your shares are issued in certificate form and you discontinue
               your participation in the plan, you (or your nominee) will
               receive an additional certificate for all full shares and a check
               for any fractional shares in your account.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  25  Minnesota Municipal Income Portfolio
<PAGE>
           Shareholder Update (continued)
- --------------------------------------------------------------------------------
 
                  PLAN AMENDMENT/TERMINATION
               The fund reserves the right to amend or terminate the plan.
               Should the plan be amended or terminated, participants will be
               notified in writing at least 90 days before the record date for
               such dividend or distribution. The plan may also be amended or
               terminated by IFTC with at least 90 days written notice to
               participants in the plan.
 
               Any question about the plan should be directed to your investment
               professional or to Investors Fiduciary Trust Company, P.O. Box
               419432, Kansas City, Missouri 64141, 1-800-543-1627.
 
- ---------------------------------------------------------------------
 
          1998 Annual Report  26  Minnesota Municipal Income Portfolio
<PAGE>

                THIS PAGE WAS INTENTIONALLY LEFT BLANK.

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

          1998 Annual Report   27   Minnesota Municipal Income Portfolio

<PAGE>

GLOSSARY OF TERMS ***
- --------------------------------------------------------------------------------

BENCHMARK
A benchmark is an established basis of comparison for an investment's 
performance. A benchmark may be an unmanaged market index or a group of similar 
investments.

EFFECTIVE DURATION
Effective duration estimates how much the value of a security is expected to 
change with a given change in interest rates. Longer effective durations 
indicate more sensitivity to changes in interest rates. For example, if 
interest rates were to increase by 1%, the market value of a bond with an 
effective duration of five years would decrease by about 5%, with all other 
factors being constant. It is important to remember that effective duration 
is based on certain assumptions and has several limitations. It is most 
effective as a measure when interest rate changes are small, rapid and occur 
equally across all points of the yield curve. In addition, effective duration 
is difficult to calculate precisely, especially in the case of a bond that is 
callable prior to maturity, and can be greatly affected by interest rate 
changes.

FEDERAL FUNDS RATE
The federal funds rate is the interest charged by banks with excess reserves at 
a Federal Reserve district bank to banks needing overnight loans to meet reserve
requirements. The federal funds rate is the most sensitive indicator of the 
direction of interest rates, since it is set daily by the market, unlike the 
prime rate and the discount rate, which are periodically changed by banks and 
the Federal Reserve Board, respectively.

PREFERRED STOCK
This fund holds preferred stock, which pays dividends at a specified rate and 
has preference over common stock in the payments of dividends and the 
liquidation of assets. Rates paid on preferred stock are reset every seven days 
and are based on short-term, tax-exempt interest rates. Preferred shareholders 
accept these short-term rates in exchange for low credit risk (shares of 
preferred stock are rated AAA by Moody's and S&P) and high liquidity (shares of 
preferred stock trade at par and are remarketed every seven days). The proceeds 
from the sale of preferred stock are invested at intermediate- and long-term 
tax-exempt rates. Because these intermediate- and long-term rates are normally 
higher than the short-term rates paid on preferred stock, common shareholders 
benefit by receiving higher dividends and/or an increase to the dividend 
reserve. However, the risk of having preferred stock is that if short-term rates
rise higher than intermediate- and long-term rates, creating an inverted yield 
curve, common shareholders may receive a lower rate of return than if their fund
did not have any preferred stock outstanding. This type of economic environment 
is unusual and historically has been short term in nature. Investors should also
be aware that the issuance of preferred stock results in the leveraging of 
common stock, which increases the volatility of both the net asset value of the 
fund and, potentially, the market value of shares of common stock.

*** This symbol represents a graduation cap, used throughout this report to 
indicate terms defined in the glossary.


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

          1998 Annual Report   28   Minnesota Municipal Income Portfolio

<PAGE>

DIRECTORS
- --------------------------------------------------------------------------------
DAVID T. BENNETT, Chairman, Highland Homes, Inc., USL Products, Inc., Kiefer 
Built, Inc., of Counsel, Gray, Plant, Mooty, Mooty & Bennett, P.A.
JAYE F. DYER, President, Dyer Management Company
WILLIAM H. ELLIS, Retired President, Piper Jaffray Companies Inc., Piper Capital
Management Incorporated
KAROL D. EMMERICH, President, The Paraclete Group
LUELLA G. GOLDBERG, Director, TCF Financial, ReliaStar Financial Corp., Hormel 
Foods Corp.
DAVID A. HUGHEY, Retired Executive Vice President and Chief Administrative 
Officer of Dean Witter InterCapital Inc. and Dean Witter Trust Co. 
GEORGE LATIMER, Chief Executive Officer, National Equity Funds

OFFICERS
- --------------------------------------------------------------------------------
WILLIAM H. ELLIS, Chairman of the Board
PAUL A. DOW, President
ROBERT H. NELSON, Vice President and Treasurer
SUSAN SHARP MILEY, Secretary

INVESTMENT ADVISOR
- --------------------------------------------------------------------------------
PIPER CAPITAL MANAGEMENT INCORPORATED
222 South Ninth Street, Minneapolis, MN  55402-3804

CUSTODIAN, ACCOUNTING AND TRANSFER AGENT
- --------------------------------------------------------------------------------
INVESTORS FIDUCIARY TRUST COMPANY
801 Pennsylvania, Kansas City, MO  64105-1307

INDEPENDENT AUDITORS
- --------------------------------------------------------------------------------
KPMG PEAT MARWICK LLP
4200 Norwest Center, Minneapolis, MN  55402

LEGAL COUNSEL
- --------------------------------------------------------------------------------
DORSEY & WHITNEY LLP
220 South Sixth Street, Minneapolis, MN  55402

FOR MORE INFORMATION

BY PHONE [GRAPHIC]

800 866-7778

FOR GENERAL INFORMATION
press 5, our Mutual Fund Services representatives are ready to answer your 
questions.

TO ORDER LITERATURE
press 5, ask a service representative to mail you additional literature, 
including a Quarterly Update. You can also request to be put on a mailing list 
to receive this information automatically each quarter.  

BY MAIL [GRAPHIC]

Piper Capital Management
Attn: Mutual Fund Services
222 South Ninth Street 
Minneapolis, MN 55402-3804

In an effort to reduce costs to our shareholders, we have implemented a process 
to reduce duplicate mailings of the fund's shareholder reports. This 
householding process should allow us to mail one report to each address where 
one or more registered shareholders with the same last name reside. If you would
like to have additional reports mailed to your address, please call our Mutual 
Fund Services area at 800 866-7778, or mail a request to us.

ON-LINE [GRAPHIC]

http://www.piperjaffray.com/

<PAGE>

[LOGO]

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       100% TOTAL RECOVERED FIBER, INCLUDING 15% POST-CONSUMER WASTE.

#21420   3/1998 072-98



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