District of Columbia Counties Directory & Interactive Map
Complete official guide to all 1 counties in District of Columbia (DC). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
District of Columbia County Breakdown
Showing 1 of 1 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| District of Columbia | 11001 | Washington | 678,972 | 61 sq mi | Lookup |
Geographic Structure of District of Columbia Counties
County Administration & Governance
In District of Columbia, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Washington and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All District of Columbia counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (11) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:District of Columbia (678,972 residents)
- Largest by Land Area:District of Columbia (61 sq mi)
- State Capital:Washington
- Census Bureau Region:South United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.