EX-99.906CERT Pursuant to 18 U.S.C ss. 1350, the undersigned officer of PIMCO Municipal Income Fund II (the "Registrant"), hereby certifies, to the best of his knowledge, that the Registrant's report on Form N-CSR for the period ended May 31, 2003 (the "Report") fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, 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: July 31, 2003 By /s/ Brian S. Shlissel - ------------------------ Brian S. Shlissel President and Chief Executive Officer A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the version of this written statement required by Section 906, has been provided to PIMCO Municipal Income Fund II and will be retained by PIMCO Municipal Income Fund II and furnished to the Securities and Exchange Commission or its staff upon request. 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. Pursuant to 18 U.S.C ss. 1350, the undersigned officer of PIMCO Municipal Income Fund II (the "Registrant"), hereby certifies, to the best of his knowledge, that the Registrant's report on Form N-CSR for the period ended May 31, 2003 (the "Report") fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, 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: July 31, 2003 By /s/ Lawrence G. Altadonna - ---------------------------- Lawrence G. Altadonna Treasurer A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the version of this written statement required by Section 906, has been provided to PIMCO Municipal Income Fund II and will be retained by PIMCO Municipal Income Fund II and furnished to the Securities and Exchange Commission or its staff upon request. 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.