COUNTY · WV
Mercer County, West Virginia
Mercer County is a county in West Virginia with FIPS code 54055 and an estimated population of 58,057 (Census 2023), 9th largest of 55 in the state.
County facts
- Name
- Mercer County
- State
- West Virginia
- Type
- county
- FIPS code
- 54055
- State FIPS
- 54
- Population (2023)
- 58,057
- Change since 2020
- -2.5%
- State rank
- 9 of 55
Population is the Census Bureau’s Vintage 2023 estimate.
Other counties in West Virginia
Questions
What is the FIPS code for Mercer County?
Mercer County, West Virginia has the five-digit FIPS code 54055: 54 for the state and 055 for the county.
What state is Mercer County in?
Mercer County is in West Virginia.
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.