District of Columbia counties by area
Official, comparable measurements for 1 county equivalent.
Understanding District of Columbia’s county areas
The District of Columbia appears as one county equivalent in the Census Gazetteer: District of Columbia, GEOID 11001. With a single entry, the largest, smallest, and median land measurements are all the same. A within-district size ranking therefore provides no additional comparison.
Its 61.1 mi² of land places it at #3,113 in the national land ranking. Water adds 7.2 mi², or 10.6% of total area. An estimated 693,645 people lived there on July 1, 2025 (+0.6% since 2020), or 11,348 per square mile of land. The county-equivalent profile provides its map, original measurements, and national comparisons.
These calculations use the 2026 Census county records listed below. County-equivalent boundaries vary between states; area alone does not measure population, density, or usable land. See coverage and calculation rules.
Complete area table
Sorted from largest to smallest land area.
| # | County / equivalent | Land | Water | Water share | Population | Per mi² |
|---|---|---|---|---|---|---|
| 1 | District of ColumbiaGEOID 11001 | 61.1 mi² | 7.2 mi² | 10.6% | 693,645 | 11,348 |