About 20440 - Washington, District of Columbia
20440 is a mid-sized ZIP code covering Washington in District of Columbia, the United States. This area falls under Washington County County.
Washington has a reported population of 35,128. This puts it well ahead of the typical ZIP code in District of Columbia (roughly 22,323).
Median household income is about $105,700 (near the District of Columbia average).
This ZIP code sits alongside neighboring areas like Washington within District of Columbia.