High Quality Content by WIKIPEDIA articles! The Metropolitan Transit Authority of Harris County, commonly called METRO or MTA) is a major public transportation agency based in Houston, Texas. It operates bus, light rail, future commuter rail, and paratransit service (under the name METROLift) in the city as well as most of Harris County. METRO also operates bus service to two cities in Fort Bend County. The METRO headquarters are in the in the Lee P. Brown Administration Building in Downtown Houston.