COUNTY · KY
Mason County, Kentucky
Mason County is a county in Kentucky with FIPS code 21161 and an estimated population of 16,841 (Census 2023), 68th largest of 120 in the state.
County facts
- Name
- Mason County
- State
- Kentucky
- Type
- county
- FIPS code
- 21161
- State FIPS
- 21
- Population (2023)
- 16,841
- Change since 2020
- -1.7%
- State rank
- 68 of 120
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Mason County?
Mason County, Kentucky has the five-digit FIPS code 21161: 21 for the state and 161 for the county.
What state is Mason County in?
Mason 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.