1933 Act File No.	2-57181
1940 Act File No.	811-2677

Form N-1A

SECURITIES AND EXCHANGE COMMISSION

Washington, DC  20549

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
	Pre-Effective Amendment No.
	Post-Effective Amendment No.	71
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
	Amendment No.	55

FEDERATED MUNICIPAL SECURITIES FUND, INC.

(Exact Name of Registrant as Specified in Charter)

Federated Investors Funds

4000 Ericsson Drive

Warrendale, PA 15086-7561

 (Address of Principal Executive Offices)

(412) 288-1900

 (Registrant’s Telephone Number, including Area Code)

John W. McGonigle, Esquire

Federated Investors Tower

Pittsburgh, Pennsylvania  15222-3779

 (Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):
X	immediately upon filing pursuant to paragraph (b)
	on	pursuant to paragraph (b)
	60 days after filing pursuant to paragraph (a)(1)
	on	pursuant to paragraph (a)(1)
	75 days after filing pursuant to paragraph (a)(2)
	on	pursuant to paragraph (a)(2) of Rule 485
If appropriate, check the following box:
	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, and the Investment Company Act of 1940, the Registrant, FEDERATED MUNICIPAL SECURITIES FUND, INC., certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Pittsburgh and Commonwealth of Pennsylvania, on the  day of June, 2011.

FEDERATED MUNICIPAL SECURITIES FUND, INC.

BY:  /s/ George F. Magera

         George F. Magera, Assistant Secretary

Pursuant to the requirements of the Securities Act of 1933, this Amendment to its Registration Statement has been signed below by the following person in the capacity and on the date indicated:

NAME	TITLE	DATE
BY:  /s/ George F. Magera            George F. Magera, Assistant Secretary	Attorney In Fact For the Persons Listed Below	June  , 2011
John F. Donahue *	Director
J. Christopher Donahue *	President and Director (Principal Executive Officer)
Richard A. Novak*	Treasurer (Principal Financial Officer)
Nicholas P. Constantakis*	Director
John F. Cunningham*	Director
Maureen Lally-Green*	Director
Peter E. Madden*	Director
Charles F. Mansfield, Jr.*	Director
R. James Nicholson*	Director
Thomas O’Neill*	Director
John S. Walsh*	Director
James F. Will*	Director
*By Power of Attorney

Federated Municipal Securities Fund, Inc.

Post-Effective Amendment No. 71

This Post-Effective Amendment is filed for the sole purpose of submitting the XBRL Interactive Data File exhibits for the Risk/Return Summary of the above-named Fund filed as part of Post-Effective Amendment No. 70 on May 27, 2011.  The exhibits filed herewith do not constitute the complete publicly filed disclosure for the Fund, and should be used in conjunction with the complete prospectus for the Fund.

Exhibit List for Interactive Data File Submissions.

EX-101.INS	INSTANCE
EX-101.SCH	SCHEMA
EX-101.CAL	CALCULATION LINKBASE
EX-101.DEF	DEFINITION LINKBASE
EX-101.LAB	LABEL LINKBASE
EX-101.PRE	PRESENTATION LINKBASE