List of numbered highways in Washington, D.C.

District of Columbia Routes
Standard markers for highways in the District of Columbia
Highway names
State:	District of Columbia Route X (DC X)
System links
Streets and Highways of Washington, D.C. Interstate U.S D.C. State-Named Streets

District of Columbia Routes are numbered highways maintained by District of Columbia's District Department of Transportation (DDOT). In addition to these routes, there are several Interstate and United States Numbered Highways that pass through Washington, D.C.. The metro area is also served by three unnumbered, federally maintained, parkways: the Clara Barton Parkway, the Rock Creek and Potomac Parkway, and the George Washington Memorial Parkway (the latter on the west side of the Potomac River, but a portion of it is east of the Boundary Channel).

The chart below consists of all District of Columbia Routes, including signed routes that no longer traverse (if ever built) through the District of Columbia. All routes (except DC 295) that reach the district border (either into Maryland or Virginia) continue with the same designation type and number in the bordering state. Historically, most Maryland routes that reach the district border continued into the district as like-numbered D.C. Route. Virginia has not had any state highways that crossed the Potomac River into D.C. Many of these D.C. Routes may have been unsigned, but still appeared on some maps.