Exhibit 32.1

SECTION 1350 CERTIFICATIONS

The undersigned hereby certify that the quarterly report on Form 10-Q of Insight Midwest, L.P. (the “Registrant”) for the quarter ended March 31, 2005, 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

Chairman, President and Chief Executive Officer

Insight Midwest, L.P.

May 16, 2005

/s/ John Abbot

John Abbot

Senior Vice President and Chief Financial Officer

Insight Midwest, L.P.

May 16, 2005