CERTIFICATIONS PURSUANT TO SECTION 906
EX-99.906CERT

                                  CERTIFICATION

R. Jay Gerken, Chief Executive Officer, and Richard L. Peteka, Chief Financial
Officer of Smith Barney Muni Funds: National Portfolio (the "Registrant"), each
certify to the best of his or her knowledge that:

1. The Registrant's periodic report on Form N-CSR for the period ended March 31,
2004 (the "Form N-CSR") fully complies with the requirements of section 15(d) of
the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Form N-CSR fairly presents, in all material
respects, the financial condition and results of operations of the Registrant.

Chief Executive Officer                              Chief Financial Officer
Smith Barney Muni Funds:                             Smith Barney Muni Funds:
National Portfolio                                   National Portfolio



/s/ R. Jay Gerken                                    /s/ Richard L. Peteka
- ---------------------------                          ---------------------------
R. Jay Gerken                                        Richard L. Peteka
Date: June 7, 2004                                   Date: June 7, 2004

This certification is being furnished to the Securities and Exchange Commission
solely pursuant to 18 U.S.C. (S) 1350 and is not being filed as part of the Form
N-CSR with the Commission.