AC Transit (Alameda-Contra Costa Transit District) is an Oakland-based public transit agency serving the western portions of Alameda and Contra Costa counties in the East Bay of the San Francisco Bay Area. AC Transit also operates "Transbay" routes across San Francisco Bay to San Francisco and selected areas in San Mateo and Santa Clara counties. AC Transit is constituted as a special district under California law. It is governed by seven elected members (five from geographic wards and two at large). It is not a part of or under the control of Alameda or Contra Costa counties or any local jurisdictions. Buses operate out of four operating divisions: Emeryville, East Oakland (Seminary), Hayward, and Richmond. The Operations Control Center is in Emeryville. The Richmond operating division closed in 2011, but opened again in early 2017 due to a revived economy. The District is the public successor to the privately owned Key System. In 2021, the system had a ridership of 24,311,300, or about 131,100 per weekday as of the third quarter of 2022.
