CITY · DC
What county is Washington, DC in?
Washington, D.C. is not in a county. The District of Columbia is itself a county equivalent.
County details
- City
- Washington, District of Columbia
- Primary county
- District of Columbia
- FIPS code
- 11001
- County population
- 678,972
Some cities extend into more than one county. Washington is placed in the county that contains its center. For a specific address, use the address lookup.
Questions
What county is Washington in?
Washington, D.C. is not in a county. The District of Columbia is itself a county equivalent.
What is the county seat of District of Columbia?
County seats are not part of the data on this site. Check the county’s official website.
Can a city be in two counties?
Yes. Large cities such as Houston and Atlanta cross county lines. The address lookup shows the exact county for any street address.
Sources: U.S. Census Bureau geographic reference files; FCC Area API; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.