Wichita, city, seat (1870) of Sedgwick county, south-central Kansas, U.S. It lies on the Arkansa… Wichita, the largest city in the state, is at the heart of a three-county metropolitan area. Nearby communities include Park City (north), Andover (east), and Derby and Haysville (south). Inc. city, 1871. Area city, 139 square miles (360 square km). Pop. (2010) 382,368; Wichita Metro Area, 6…