what county is clay center ks
Clay Center, KS. Clay Center is a city in and the county seat of Clay County, Kansas, United States. As of the 2010 census, the city population was 4,334. Clay Center is located at 39Â°22â²48â³N 97Â°7â²23â³W / 39.38Â°N 97.12306Â°W / 39.38; -97.12306 (39.379920, -97.123168). According to the United States Census Bureau, the city has a total area of 2.6 square miles (6.7 kmÂ²), all of it land.