About 20340 - Washington, District of Columbia
20340 is a mid-sized ZIP code covering Washington in District of Columbia, the United States. This area falls under Washington County County.
Census data puts the population of this ZIP code at 26,913 residents. This is roughly in line with the District of Columbia average of about 22,323 residents.
Median household income is about $80,000 (below the District of Columbia average).
This ZIP code sits alongside neighboring areas like Washington within District of Columbia.