U.S. Route 1 in the District of Columbia

U.S. Route 1
Map of the District of Columbia with US 1 highlighted in red
Route information
Maintained by DDOT
Length:	7 mi (11 km)
Existed:	1926 – present
Major junctions
South end:	US 1 / I‑395 in Arlington, VA
	I‑395 in East Potomac Park US 50 in Downtown Washington US 29 in Shaw
North end:	US 1 / Eastern Ave in Mt. Rainier, MD
Highway system
United States Numbered Highway System List Special Divided Replaced Streets and Highways of Washington, D.C. Interstate U.S D.C. State-Named Streets ← I‑695 US 29 →

U.S. Route 1 Alternate
Location:	Washington, D.C.–Hyattsville, MD
Length:	2.1 mi (3.4 km)

With the District of Columbia, U.S. Route 1 passes between Arlington, Virginia and Mount Rainier, Maryland predominantly along surface streets. However, it forms a few overlaps with other routes.

Northbound US 1 and Interstate 395 enter the District of Columbia from Virginia on the 14th Street Bridge. US 1 traffic exits Route 395 from the left to 14th Street, S.W. After 14th Street crosses the National Mall, US 1 turns right onto Constitution Avenue. It then turns left onto 6th Street, N.W., and then right onto Rhode Island Avenue. US 1 continues on Rhode Island Avenue through Northeast Washington and into Maryland.

Southbound US 1 enters the District of Columbia from Maryland on Rhode Island Avenue. US 1 turns left onto 6th Street, N.W., then right onto L Street, N.W., and then left onto 9th Street, N.W. It enters the Ninth Street Tunnel and joins Interstate 395, which it follows into Virginia.

Northbound US 1 is concurrent with eastbound U.S. Route 50 along Constitution Avenue from 14th Street to 6th Street, N.W., and along 6th Street from Constitution Avenue to New York Avenue, N.W. Southbound US 1 is concurrent with westbound US 50 along L Street between 6th and 9th streets, N.W., and along 9th Street from L Street to Constitution Avenue. Both northbound and southbound US 1 have concurrencies with Interstate 395.