COUNTY · VA
Arlington County, Virginia
Arlington County is a county in Virginia with FIPS code 51013 and an estimated population of 234,162 (Census 2023), 8th largest of 133 in the state.
County facts
- Name
- Arlington County
- State
- Virginia
- Type
- county
- FIPS code
- 51013
- State FIPS
- 51
- Population (2023)
- 234,162
- Change since 2020
- -1.9%
- State rank
- 8 of 133
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Arlington County?
Arlington County, Virginia has the five-digit FIPS code 51013: 51 for the state and 013 for the county.
What state is Arlington County in?
Arlington 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.