KOPN (89.5 FM) is a non-profit community radio station in Columbia, Missouri, United States, which from its start was modeled on the progressive format of KPFA in Berkeley, California. The station relies heavily on volunteers for programming and also carries programming from National Public Radio, Public Radio International, and Pacifica radio network. The station went on the air in 1973, becoming the eighth open-access, listener-supported station in the U.S. and the first to serve an audience of less than 100,000 people.