KMZN (740 AM) is a commercial radio station licensed to serve the community of Oskaloosa, Iowa. The station primarily broadcasts a classic hits format. KMZN is owned by Jomast Corporation. It was first licensed on January 15, 1951 as KBOE. 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.