COUNTY · VA
Louisa County, Virginia
Louisa County is a county in Virginia with FIPS code 51109 and an estimated population of 41,037 (Census 2023), 44th largest of 133 in the state.
County facts
- Name
- Louisa County
- State
- Virginia
- Type
- county
- FIPS code
- 51109
- State FIPS
- 51
- Population (2023)
- 41,037
- Change since 2020
- +8.6%
- State rank
- 44 of 133
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Louisa County?
Louisa County, Virginia has the five-digit FIPS code 51109: 51 for the state and 109 for the county.
What state is Louisa County in?
Louisa County is in 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.