Johnson County is a county located in western portion of the U.S. state of Missouri. As of the 2020 census, the population was 54,013. Its county seat is Warrensburg. The county was formed December 13, 1834 from Lafayette County and named for Vice President Richard Mentor Johnson. Johnson County comprises the Warrensburg Micropolitan Statistical Area, which is also included in the Kansas City-Overland Park-Kansas City, MO-KS Combined Statistical Area.
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