| Marion County Illinois Cities/Towns - Alma, Central City, Iuka, Junction City, Kell, Kinmundy, Odin, Omega, Patoka, Salem (County Seat), Sandoval, Vernon, Walnut Hill |
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Your Ad Here Marion County is a county located in the U.S. state of Illinois. As of 2000, the population was 41,691. Its county seat is Salem. History Marion County was organized in 1823. It was named in honor of Revolutionary War Gen. Francis Marion, the "Swamp Fox". ![]() |