This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Metrobus provides more than 400,000 trips each weekday serving 11,500 bus stops in the District of Columbia, Maryland, and Virginia. Metrobus is the sixth busiest bus agency in the United States, with a fleet of more than 1,500 buses operating on 325 routes. Last Updated: 04/2015