SECTION 906 CERTIFICATION

Pursuant to 18 U.S.C.ss.  1350, the undersigned  officers of Federated Municipal
Securities Income Trust on behalf of Federated California Municipal Income Fund,
Federated Michigan  Intermediate  Municipal Trust,  Federated New York Municipal
Income Fund,  Federated  North Carolina  Municipal  Income Fund,  Federated Ohio
Municipal  Income  Fund,  Federated  Pennsylvania  Municipal  Income  Fund  (the
"Registrant"),   hereby  certify,  to  the  best  of  our  knowledge,  that  the
Registrant's  Report on Form N-CSR for the period ended  8/31/03 (the  "Report")
fully complies with the  requirements  of Section 13(a) or 15(d), as applicable,
of the Securities and Exchange Act of 1934 and that the information contained in
the Report fairly presents,  in all material respects,  the financial  condition
and results of operations of the Registrant.


Dated: October 23, 2003

/s/ J. Christopher Donahue

Title: President, Principal Executive Officer



Dated: October 23, 2003

/s/ Richard J. Thomas

Title: Treasurer, Principal Financial Officer

This certification is being furnished solely pursuant to 18 U.S.C.ss. 1350 and
is not being filed as part of the Report or as a separate disclosure document.