Some of the cities, towns, and places in Clay County are Arley, Avondale, Birmingham, Cass County, Chandler, Claycomo, Claysville, Clevenger, Clinton County, Ectonville, Excelsior Estates, Excelsior Springs, Gladstone, Glenaire, Holt, Jackson, Kansas City, Kearney, Lawson, Liberty, Miltondale, Missouri City, Mosby, North Kansas City, Oaks, Oakview, Oakwood, Oakwood Park, Platte, Platte County, Pleasant Valley, Prathersville, Randolph, Ray County, Roosterville, Smithville, Stockdale, Sugar Creek, Winner
Clay County is located in the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2020 census, the county had a population of 253,335, making it the fifth-most populous county in Missouri. Its county seat is Liberty. The county was organized January 2, 1822, and named in honor of U.S. Representative Henry Clay from Kentucky, later a member of the United States Senate and United States Secretary of State.Clay County contains many of the area's northern suburbs, along with a substantial portion of the city of Kansas City, Missouri. It also owns and operates the Midwest National Air Center in Excelsior Springs.