|Knox County Illinois Cities/Towns - Abingdon, Altona, Dahinda, East Galesburg, Elba Center, Gilson, Henderson, Henderson Grove, Knoxville, Maquon, Oneida, Ontario, Rio, St. Augustine, Truro, Victoria, Wataga, Williamsfield, Yates City
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Knox County is a county located in the U.S. state of Illinois. As of 2016, the population was 50,938. Its county seat is Galesburg.
Knox County was organized in 1825. Knox County was named in honor of Henry Knox, the first US Secretary of War.