It airs an oldies music format including Cedar Rapids Roughriders hockey, Coe College football, and serves as an overflow station for University of Iowa men's and women's basketball when games conflict with another Hawkeye event airing on sister station WMT.

Both stations formatted country music—although not exclusively until sometime later in the 1960s—and for many years, the AM signal was duplicated on the FM frequency.

On March 6, 1995, KHAK changed its format to contemporary Christian as KTOF, and was a simulcast of KWOF in Hiawatha.

[4] On December 19, 2001, the station switched call signs to the current KMJM[1] and began airing a nostalgia format of "American music classics" from the 1930s and 1940s.

Every year during the first week of November, KMJM drops its regular format and plays Christmas music.