District of Columbia
A county-equivalent in District of Columbia, ranked 1 of 1 by population.
County-equivalentFIPS 11001
- Population
- 693,645
- +22,687 (+3.4%) since 2020
- Land area
- 61.1
- square miles. A further 10.6% of the total area is water
- Population density
- 11,348
- people per square mile, computed rather than published
- Seat
- District of Columbia
- District of Columbia is its own seat.
- Established
- 1790
- 235 years ago
- Largest city
- Washington city
- Population 693,645.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.
Satellite view
Aerial imagery of District of Columbia with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.
Where District of Columbia ranks
Position among the 1 county-equivalent of District of Columbia, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.
| Measure | Value | In District of Columbia | Nationally |
|---|---|---|---|
| Population | 693,645 | 1st of 1 | 101st of 3,144 |
| Land area | 61.1 sq mi | 1st of 1 | 3,099th of 3,144 |
| Population density | 11,348 per sq mi | 1st of 1 | 9th of 3,144 |
| Median household income | $109,870 | 1st of 1 | 101st of 3,143 |
Full data for District of Columbia
| Measure | Value | Source and vintage |
|---|---|---|
| Population | 693,645 | Vintage 2025 Population Estimates |
| Population in 2020 | 670,958 | Vintage 2025 Population Estimates |
| 2020 estimates base? | 689,544 | Vintage 2025 Population Estimates |
| Land area | 61.1 sq mi | 2025 Gazetteer Files |
| Water area | 7.2 sq mi | 2025 Gazetteer Files |
| Total area | 68.4 sq mi | 2025 Gazetteer Files |
| Population density? | 11,348 per sq mi | Computed: Vintage 2025 estimates divided by 2025 Gazetteer land area |
| Median household income | $109,870 | American Community Survey 2020-2024 5-Year Estimates |
| Median home value | $737,100 | American Community Survey 2020-2024 5-Year Estimates |
| Median age | 34.9 | American Community Survey 2020-2024 5-Year Estimates |
| Households | 324,491 | American Community Survey 2020-2024 5-Year Estimates |
| Housing units | 361,014 | American Community Survey 2020-2024 5-Year Estimates |
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.
How the population changed
The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:
- Births minus deaths
- +2,516
- 7,336 births, 4,820 deaths
- Net migration
- -213
- More people moved out than moved in.
Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.
The 4 areas bordering District of Columbia
Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.
| Bordering area | State | Shared border | Population |
|---|---|---|---|
| Prince George's County | Maryland | 17 mi | 970,374 |
| Arlington County | Virginia | 11 mi | 243,931 |
| Montgomery County | Maryland | 8.9 mi | 1,074,582 |
| Alexandria city | Virginia | 4.4 mi | 160,662 |
Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.
Side by side
All 1 county-equivalent of District of Columbia
Open the interactive District of Columbia county map, or jump straight to any of them.
- District of Columbia
Data on this page last rebuilt 30 August 2026. How these figures are produced.