


The highway enters a densely populated residential area, passing between Riverdale Park to the east and the town of University Park to the west. US 1 continues north through downtown Hyattsville, gaining a center turn lane before entering the town of Riverdale Park, where the highway intersects MD 410 (East–West Highway). US 1 approaching Madison Street in Hyattsville US 1 curves to the north and the highway's name changes to Baltimore Avenue at Farragut Street, shortly before intersecting US 1 Alternate. The highway begins to closely parallel CSX's Capital Subdivision and MARC's Camden Line as it reduces to a four-lane undivided highway, passing the District Court of Maryland for Prince George's County building.

The median widens as the highway crosses the Northwest Branch Anacostia River and enters the City of Hyattsville. US 1 passes through North Brentwood as a four-lane divided highway without parking through a mix of residences and commercial establishments. The highway leaves Mount Rainier and enters Brentwood, where the highway meets MD 208 (38th Street). US 1 then meets the intersections of 34th Street and Perry Street at a roundabout (which was finished being constructed during August 2001, and replaced the traffic lights originally at this intersection ), then continues northeast through a densely populated residential area. US 1 leaves the District of Columbia as Rhode Island Avenue NE and just simply becomes Rhode Island Avenue, a four-lane divided street with parking through a downtown-like commercial area, right after crossing the intersection of Eastern Avenue NE (the MD/DC Line) and entering the city of Mount Rainier in Prince George's County, Maryland. Route description Prince George's County 2.6 Baltimore–Washington Boulevard receives relief.
