INDEPENDENT CITY · VA
Fairfax city, Virginia
Fairfax city is an independent city in Virginia with FIPS code 51600 and an estimated population of 25,144 (Census 2023), 72nd largest of 133 in the state.
County facts
- Name
- Fairfax city
- State
- Virginia
- Type
- independent city
- FIPS code
- 51600
- State FIPS
- 51
- Population (2023)
- 25,144
- Change since 2020
- +4.0%
- State rank
- 72 of 133
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Fairfax city?
Fairfax city, Virginia has the five-digit FIPS code 51600: 51 for the state and 600 for the county.
What state is Fairfax city in?
Fairfax city 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.