16th Street Northwest

16th Street Northwest is a prominent north-south thoroughfare in the northwest quadrant of Washington, D.C.

Part of Pierre L'Enfant's design for the city, 16th Street begins just north of the White House across Lafayette Park at H Street and continues due north in a straight line passing K Street, Scott Circle, Meridian Hill Park, Rock Creek Park, and the Walter Reed Army Medical Center before crossing Eastern Avenue into Silver Spring, Maryland, where it ends at Georgia Avenue. From K Street to the District line, 16th Street is part of the National Highway System. The Maryland portion of the street is designated Maryland State Highway 390. The entire street is 7+1⁄₂ miles (12 km) long.

The Washington meridian, a Prime Meridian once in use in the United States, follows the street.