Pennsylvania Avenue

Pennsylvania Avenue is a primarily diagonal street in Washington, D.C., and Prince George's County, Maryland, that connects the United States Capitol with the White House and then crosses northwest Washington, D.C. to Georgetown. Traveling through southeast Washington from the Capitol, it enters Maryland, and becomes MD Route 4 (MD 4) and then MD Route 717 in Upper Marlboro, and finally Stephanie Roper Highway. The section between the White House and Congress is the basis for the Pennsylvania Avenue National Historic Site and is sometimes referred to as "America's Main Street"; it is the location of official parades and processions, and periodic protest marches. Pennsylvania Avenue is an important commuter road and is part of the National Highway System. Route The avenue runs for in Washington, D.C., but the of Pennsylvania Avenue from the White House to the United States Capitol building is far and away the most famed section of the avenue. It continues within the city for , from the southeast corner of the Capitol grounds through the Capitol Hill neighborhood, and over the Anacostia River on the John Philip Sousa Bridge. Crossing most of Prince George's County, Maryland, it ends from the Washington, D.C. border in Maryland at the junction with MD 717 in Upper Marlboro, where the name changes to Stephanie Roper Highway, for a total length of . Stephanie Roper Highway used to be Pennsylvania Avenue, but was renamed in 2012. In addition to its street names, in Maryland it is designated as Maryland Route 4.