Connecticut Avenue (Washington, D.C.)

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Streetcar passing a real-estate billboard on a developing section of Connecticut Avenue about 1903

Connecticut Avenue is a major route in the Northwest quadrant of Washington, D.C., and suburban Montgomery County, Maryland. It is one of the diagonal avenues radiating from the White House, and the segment south of Florida Avenue was one of the original streets in Pierre L'Enfant's plan for Washington.

Connecticut Avenue begins just north of the White House at Lafayette Square. It is interrupted by Farragut Square, considered the city's busiest spot for pedestrian traffic^{[citation needed]}. North of Farragut Square and K Street, Connecticut Avenue is one of the major streets in downtown Washington and a nationally acknowledged high-rent shopping street.

As Connecticut Avenue approaches the Dupont Circle neighborhood, it splits at N Street into a through roadway and service roadways. The through roadway tunnels under Dupont Circle, while the service roadways intersect the outer roadway of the circle. Just north of the circle, the service roadways are again a nationally acknowledged shopping street, but this time known for the many gay-oriented businesses, of which the most famous is Lambda Rising. The through roadway and service roadways rejoin at R Street. Originally, there was no tunnel, and all vehicular traffic on Connecticut Avenue went through the circle. The tunnel was built in 1949.

Once Connecticut Avenue crosses Florida Avenue near the Hilton Washington Hotel (the city's second largest), it narrows and winds through the Kalorama neighborhood. (The Embassy Row district extends from here westward). The avenue then crosses Rock Creek Park on the William Howard Taft Bridge and goes through uptown Washington, D.C., including the Woodley Park, Cleveland Park, and Chevy Chase, D.C. neighborhoods.

The Red Line of the Washington Metro subway system runs beneath Connecticut Avenue, with access points at the Farragut North, Dupont Circle, Woodley Park-Zoo/Adams Morgan, Cleveland Park, and Van Ness-UDC stations.

The Smithsonian National Zoological Park is located along Connecticut Avenue, halfway between the Woodley Park-Zoo/Adams Morgan and Cleveland Park Metro Stations. Also, a major operational center of Intelsat is located along this stretch of Connecticut Avenue, as are the landmark Wardman Park Marriott Hotel, the city's largest, and Shoreham Hotel, the city's fourth largest. This section is also a major commuter route and has reversible lanes along most of its length which operate during the morning and evening rush hours (7-9:30AM and 4-6:30PM). It connects with the Rock Creek and Potomac Parkway via 24th Street. Older high-rise apartments line the avenue, with elegant, older detached homes on shady side streets.

After passing the main campus of the University of the District of Columbia, Connecticut Avenue exits the District of Columbia at Chevy Chase Circle, which is at the intersection of Connecticut and Western avenues. Once entering Maryland, it gains the route designation Maryland State Highway 185 and goes through the Chevy Chase, Maryland postal area. The National 4-H Youth Conference Center is on this stretch of Connecticut Avenue, as is the Chevy Chase Country Club.

After interchanging with the Capital Beltway at Exit 33, Connecticut Avenue enters Kensington, where it is the major north-south street of the central business district. Connecticut Avenue used to stop at University Boulevard (Maryland State Highway 193). However, Concord Avenue was extended northward to form an extension of Connecticut Avenue.

That extension of Connecticut Avenue passes through Wheaton and Aspen Hill. At Georgia Avenue (Maryland State Highway 97), Connecticut Avenue loses its state route designation. Connecticut Avenue, now simply a local street, continues past Georgia Avenue and ends at Leisure World Boulevard.

Connecticut Avenue is an arterial route in the National Highway System between K Street and Nebraska Avenue.