COUNTY · KY
Clay County, Kentucky
Clay County is a county in Kentucky with FIPS code 21051 and an estimated population of 19,648 (Census 2023), 61st largest of 120 in the state.
County facts
- Name
- Clay County
- State
- Kentucky
- Type
- county
- FIPS code
- 21051
- State FIPS
- 21
- Population (2023)
- 19,648
- Change since 2020
- -3.3%
- State rank
- 61 of 120
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Clay County?
Clay County, Kentucky has the five-digit FIPS code 21051: 21 for the state and 051 for the county.
What state is Clay County in?
Clay County is in Kentucky.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.