Launched December 23, 1940. As the first station to broadcast from Marion, WMRN has traditionally been viewed as Marion County's "home" radio station. Its personalities included the late Madge Cooper Guthery (starting in 1941), and Charlie Evers (starting in the late 1950s) who were daily listening institutions throughout Marion, Ohio until they retired.
In October 2010 the AM station scored a major get as on air personality Scott Spears obtained the first interview with former "Dean of the White House Press Corps" Helen Thomas after her retirement in June 2010. Spears received an Associated Press Award in 2011 for this interview
In May of 1953, WMRN's owners launched an FM sister station WMRN-FM which played "Beautiful Music" format until its format was converted to Country & Western in the in the mid to late 1970s. Clear Channel Communications separated the AM operations from the FM station, and then sold WMRN-AM to its current owner. The station's "Tradio" program (a item "swap" show where residents offer up goods for sale or trade) remains popular with local residents.