Exhibit 11


6225 Smith Avenue
Baltimore, Maryland  21209-3600
www.piperrudnick.com

PHONE (410) 580-3000
FAX   (410) 580-3001


                                November 2, 2000


PRUDENTIAL NATIONAL MUNICIPALS FUND, INC.
Gateway Center Three
100 Mulberry Street
Newark, New Jersey  07102

         Re:      REGISTRATION STATEMENT ON FORM N-14

Ladies and Gentlemen:

         We have acted as special Maryland counsel to Prudential National
Municipals Fund, Inc., a Maryland corporation (the "Acquiring Fund"), in
connection with the proposed acquisition by the Acquiring Fund of the assets,
subject to the liabilities, of the Massachusetts Series, North Carolina Series,
and Ohio Series, each a series of Prudential Municipal Series Fund, a
Massachusetts business trust (each a "Series" and collectively, the "Acquired
Funds"), whereby each whole and fractional share of Class A, Class B and Class C
shares of each Series will be exchanged for Class A shares of the Acquiring Fund
and each whole and fractional share of Class Z shares of the Massachusetts
Series will be exchanged for Class Z shares of the Acquiring Fund (collectively,
the "Acquiring Fund Shares"), par value $.01 per share, pursuant to an Agreement
and Plan of Reorganizations by and between the Acquiring Fund and Prudential
Municipal Series Fund, on behalf of the Acquired Funds (the "Agreement"). This
opinion is furnished in connection with the Acquiring Fund's registration
statement on Form N-14 (the "Registration Statement") relating to the Acquiring
Fund Shares, which will be issued to each Series.

         In our capacity as special Maryland counsel, we have reviewed originals
or copies, certified or otherwise identified to our satisfaction, of the
following documents:

         (a)    The Charter of the Acquiring Fund certified by the Maryland
                State Department of Assessments and Taxation (the "MSDAT").



                                      PRUDENTIAL NATIONAL MUNICIPALS FUND, INC.
                                                               November 2, 2000
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         (b)    The By-Laws of the Acquiring Fund.

         (c)    The Prospectus/Proxy Statement contained in the Acquiring Fund's
                Registration Statement.

         (d)    The Agreement.

         (e)    Resolutions of the Board of Directors of the Acquiring Fund
                relating to the authorization of (i) the issuance of the
                Acquiring Fund Shares; (ii) the Registration Statement and the
                transactions contemplated thereby; and (iii) the Agreement and
                the transactions contemplated thereby.

         (f)    A short-form Good Standing Certificate for the Acquiring Fund,
                dated a recent date, issued by the MSDAT.

         (g)    A Certificate of Secretary of the Acquiring Fund, dated as of
                the date hereof, as to certain factual matters (the
                "Certificate").

         (h)    Such other documents as we have considered necessary to the
                rendering of the opinions expressed below.

         In such examination of the aforesaid documents, we have assumed,
without independent investigation, the genuineness of all signatures, the legal
capacity of all individuals who have executed any of the aforesaid documents,
the authenticity of all documents submitted to us as originals, the conformity
with originals of all documents submitted to us as copies (and the authenticity
of the originals of such copies), and the accuracy and completeness of all
public records reviewed by us. In making our examination of documents executed
by parties other than the Acquiring Fund, we have assumed that such parties had
the power, corporate or other, to enter into and perform all obligations
thereunder, and we have also assumed the due authorization by all requisite
action, corporate or other, and the valid execution and delivery by such parties
of such documents and the validity, binding effect, and enforceability thereof
with respect to such parties. As to factual matters, we have relied on the
Certificate and have not independently verified the matters stated therein.
Nothing has come to our attention that leads us to believe that any factual
representation made in the Certificate is not correct.

         Based upon the foregoing, having regard for such legal considerations
as we deem relevant, and limited in all respects to applicable Maryland law, we
are of the opinion and advise you that:

         1. The Acquiring Fund has been duly incorporated and is validly
existing and in good standing under the laws of the State of Maryland.



                                      PRUDENTIAL NATIONAL MUNICIPALS FUND, INC.
                                                               November 2, 2000
                                                                         Page 3


         2. The Acquiring Fund Shares to be issued as contemplated in the
Agreement and pursuant to the Registration Statement have been duly authorized,
and, subject to the receipt by the Acquiring Fund of consideration equal to the
net asset value thereof, when issued pursuant to the Agreement and in the manner
referred to in the Registration Statement, will constitute validly issued, fully
paid and nonassessable shares, under the laws of the State of Maryland.

         In addition to the qualifications set forth above, this opinion is
subject to the qualification that we express no opinion as to the laws of any
jurisdiction other than the State of Maryland. This opinion is limited to the
laws, exclusive of the securities or "blue sky" laws and the principles of
conflict of laws, of the State of Maryland as currently in effect. We assume no
obligation to supplement this opinion if any applicable laws change after the
date hereof or if any facts or circumstances come to our attention after the
date hereof that might change this opinion. To the extent that any documents
referred to herein are governed by the law of a jurisdiction other than
Maryland, we have assumed that the laws of such jurisdiction are the same as the
laws of the State of Maryland.

         We hereby consent to the filing of this opinion with the Commission as
Exhibit 11 to the Registration Statement and to the reference to our firm under
the heading "Legal Matters" in the Registration Statement. In giving our
consent, we do not thereby admit that we are in the category of persons whose
consent is required under Section 7 of the Securities Act of 1933, as amended,
or the rules and regulations of the Commission thereunder. This opinion is
limited to the matters set forth herein, and no other opinion should be inferred
beyond the matters expressly stated.



                                           Very truly yours,
                                           /s/ Piper Marbury Rudnick & Wolfe LLP