Insight Midwest 10-K 2004 FY Annual report

EXHIBIT 32.1

SECTION 1350 CERTIFICATIONS OF INSIGHT MIDWEST, L.P.

The undersigned hereby certify that the annual report on Form 10-K of Insight Midwest, L.P. (“the registrant”) for the year ended December 31, 2004, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) 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.

/s/    MICHAEL S. WILLNER        

Michael S. Willner

President and Chief Executive Officer

Insight Midwest, L.P.

March 30, 2005

/s/    JOHN ABBOT        

John Abbot

Senior Vice President and Chief Financial Officer

Insight Midwest, L.P.

March 30, 2005