KMZN (740 AM) is a commercial radio station licensed to serve the community of Oskaloosa, Iowa.

740 AM is a Canadian clear-channel frequency on which CFZM in Toronto, Ontario is the dominant Class A station.

KMZN must reduce nighttime power to only 10 watts in order to prevent interference to the skywave signal of CFZM.

KMZN often provides live coverage of William Penn Statesmen & Oskaloosa Indian sports events as well as coverage of Iowa Hawkeye sports, NASCAR racing and area race tracks such as the Southern Iowa Speedway, Eddyville Raceway Park, Eldon Raceway, and Knoxville Raceway.

In January 2017 KMZN changed format from sports to classic hits.