ZIP Codes of District Of Columbia County, DC

681,294 residents live across 301 ZIPs covering 68 sq mi, served by 5 distinct USPS-recognized cities.

Population moved from 633,618 to 679,941 from 2014 to 2024 — a +7.3% change. 16 ZIPs gained residents, 13 lost (and 16 held flat).

The county's wealthiest ZIP 20015 (Washington, $250,001 median) and poorest ZIP 20006 (Washington, $35,011) are 4.9 miles apart — a 7.1× income gap across local geography.

Median home values vary 5.1× across this county — from $255,200 in 20006 (Washington) to $1,292,400 in 20007 (Washington).

Density varies 13× across the county — from 4,958 people/sq mi in 20006 (Washington) to 63,814 in 20057 (Washington).

Most of the decade's growth concentrated around Washington — top growth ZIPs averaged +258.3% over the past ten years ( 20052 , 20024 and 20003 ).

Educational attainment ranges from 22.5% bachelor's+ in 20032 (Washington) to 95.6% in 20004 (Washington) — the breadth of educational profiles across the area.

Within District of Columbia, this is the #1 most populous of 1 counties and ranks #1 for median household income with the #1 fastest decade growth .

On the national stage, District Of Columbia County is ranks #96 for income .

Hosts 4 single-entity Unique ZIPs: 20242National Park Service ; 20373Joint Base Anacostia Bolling ; 20375Naval Research Laboratory ; and 20422Veterans Hospital .

Weighted by population, the typical household earns about $113,834 across the county — reflecting what a typical resident sees, not a simple ZIP average.

64.2% of adults age 25+ hold a bachelor's degree or higher (314,114 of 488,919 reporting). The most-educated ZIPs cluster around Washington.

30 Standard delivery, 18 PO Box only, 253 single-entity Unique ZIPs serve this county.