Pennsylvania Avenue

Pennsylvania Avenue
	Pennsylvania Avenue with the U.S. Capitol in the background in June 2022
	Interactive map of Pennsylvania Avenue
Maintained by	DDOT and MDSHA
Width	160 feet
Component; highways	; US 1 Alt. in Washington, DC; MD 4 from the DC–Maryland border on the northwestern edge of Suitland, MD to eastern terminus at MD 717 in Upper Marlboro, MD;
Location	Washington, D.C. and Prince George's County, Maryland in the United States
West end	M Street NW / 29th Street NW in Washington, DC
Major; junctions	US 29 in Washington, DC; 17th Street NW in Washington, DC; E Street NW / 15th Street NW in Washington, DC; US 1 / US 50 in Washington, DC; 1st Street NW in Washington, DC; Independence Avenue SE / 2nd Street SE in Washington, DC; DC 295 in Washington, DC; MD 458 in Suitland, MD; I-95 / I-495 at the Forestville, MD–Westphalia, MD line; MD 337 in Westphalia, MD; MD 223 in Melwood, MD;
East end	MD 717 in Upper Marlboro, MD

Pennsylvania Avenue is a primarily diagonal street in Washington, D.C., 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 Prince George's County, Maryland, and becomes MD Route 4 (MD 4) and then MD 717 in Upper Marlboro, and finally Stephanie Roper Highway.

The section of the avenue between the White House, which is sometimes referred to by its address "1600 Pennsylvania Avenue", and the Capitol forms 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.