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Bus

Two main public bus systems operate in Washington, D.C. Metrobus, operated by the Washington Metropolitan Area Transit Authority (WMATA), is the primary public bus system in Washington, D.C. Serving more than 400,000 riders each weekday, it is one of the nation's largest bus systems by annual ridership. The city also operates its own DC Circulator bus system, which connects commercial and touristic areas within central Washington. The DC Circulator costs only $1 to ride and is composed of six distinct routes that cover central D.C. and suburban Rosslyn, Virginia. The DC Circulator is run via a public-private partnerships between the District of Columbia Department of Transportation, WMATA, and DC Surface Transit, Inc. (DCST). The bus system services each stop approximately every 10 minutes.

Many other public bus systems operate in the various jurisdictions of the Washington region outside of the city in suburban Maryland and Virginia. Among these are the Fairfax Connector in Fairfax County, Virginia; DASH in Alexandria, Virginia; and TheBus in Prince George's County, Maryland. There are also numerous commuter buses that residents of the wider Washington region take to commute into the city for work or other events. Among these are the Loudoun County Transit Commuter Bus and the Maryland Transit Administration Commuter Bus.

The city also has several bus lines used by tourists and others visiting the city, including Big Bus Tours, Old Town Trolley Tours, and DC Trails. The city also has many charter buses used in carrying young students and other tourists from across the country to the city and region's historic sites.