Founded in 1824, Clay County is one of 102 counties in the state of Illinois. Historically, Clay County was formed from Wayne, Lawrence, Fayette, and Crawford County. The city of Louisville is the county seat. With FIPS code of 25, Clay County has a population of 13,143 and area of 468 square miles (1,212 km2).
List of all cities in Clay County, IL alphabetically
|City/Town||Postal Code||Area Code|
|Bible Grove, IL||62858||618/730|
|Clay City, IL||62824||618/730|
|Garden Hill, IL||62899||618/730|
|Sailor Springs, IL||62879||618/730|