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 - Georgia Portfolio (the "Registrant"), each certify to the best of his 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 - Georgia Portfolio Georgia 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. ss. 1350 and is not being filed as part of the Form N-CSR with the Commission. CERTIFICATION R. JAY GERKEN, Chief Executive Officer, and RICHARD L. PETEKA, Chief Financial Officer of Smith Barney Muni Funds - Pennsylvania Portfolio (the "Registrant"), each certify to the best of his 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 - Pennsylvania Portfolio Pennsylvania 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. ss. 1350 and is not being filed as part of the Form N-CSR with the Commission.