The Alameda-Contra Costa Transit District is better known as AC Transit. AC Transit serves 13 cities and adjacent unincorporated areas in the East Bay from Richmond to Fremont, and operates 138 local bus lines within the East Bay and 31 Transbay bus lines across the bridges to San Francisco and the Peninsula. AC Transit buses connect with nine other public and private transit systems, 21 BART stations, six Amtrak stations, and three ferry terminals. It is the third largest all-bus system in California.

Caltrain operates weekday trains between San Francisco and San Jose, with commute-hour service to Gilroy. Weekend service is offered from San Francisco to San Jose.

San Francisco Bay Ferry provides ferry service between: Alameda/Oakland and San Francisco; Alameda/Oakland and South San Francisco; Harbor Bay and San Francisco; and Vallejo and San Francisco.

San Francisco Bay Ferry is operated by the San Francisco Bay Area Water Emergency Transportation Authority.

Marin Transit provides daily local bus, community shuttle, West Marin Stagecoach, and paratransit services within Marin County.

Rio Vista Delta Breeze is a regional transit system that offers deviated fixed-route bus service within the City of Rio Vista and between Isleton, Rio Vista, Fairfield, and Suisun City. The bus actually comes to your door! 

Transit services are provided Monday through Friday, from 5:00 AM to 7:30 PM. There is no service on weekends and holidays.

Capitol Corridor is an intercity passenger train system that serves 18 stations along its 170-mile route, and offers frequent service between Sacramento, the San Francisco Bay Area, and Silicon Valley/San Jose. Connections to BART are available at the Oakland Coliseum and Richmond Intermodal Stations. Discounted rates are available for frequent travelers, and free transfers are available for many local transit systems. 

The Dumbarton Express service consists of two bus lines, the DB and DB1. It is administered and governed by AC Transit, with oversight by the Dumbarton Bridge Regional Operations Consortium (DBROC), comprised of AC Transit, Santa Clara Valley Transportation Authority (VTA), BART, SamTrans, and Union City Transit.

Provides local transit service in the Solano County city of Fairfield (which consists of the Travis Airforce Base and the Cordelia Village Area). FAST also operates routes that connect Fairfield to the outlying cities of Vacaville, Dixon, Davis, Sacramento and Walnut Creek.

Golden Gate Transit provides daily bus service in Marin, Sonoma, San Francisco, and Contra Costa counties.