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Public transportation

Transit is the most used form of transportation every day in San Francisco. Every weekday, more than 560,000 people travel on Muni's 69 bus routes and more than 140,000 customers ride the Muni Metro light rail system. 32% of San Francisco residents use public transportation for their daily commute to work, ranking it fourth in the United States and first on the West Coast. The San Francisco Municipal Railway, primarily known as Muni, is the primary public transit system of San Francisco. As of 2023, Muni is the eighth-largest transit system in the United States. The system operates a combined light rail and subway system, the Muni Metro, as well as large bus and trolley coach networks. Additionally, it runs a historic streetcar line, which runs on Market Street from Castro Street to Fisherman's Wharf. It also operates the famous cable cars, which have been designated as a National Historic Landmark and are a major tourist attraction.

Bay Area Rapid Transit (BART), a regional Rapid Transit system, connects San Francisco with the East Bay and San Jose through the underwater Transbay Tube. The line, which contains all except the Orange Line, runs under Market Street to Civic Center where it turns south to the Mission District, the southern part of the city, and through northern San Mateo County, to the San Francisco International Airport, and Millbrae. BART also shares stations with SFMTA Muni Metro under Market Street.

Another commuter rail system, Caltrain, runs from San Francisco along the San Francisco Peninsula to San Jose. Historically, trains operated by Southern Pacific Lines ran from San Francisco to Los Angeles, via Palo Alto and San Jose.

Amtrak Thruway runs a shuttle bus from three locations in San Francisco to its station across the bay in Emeryville. Additionally, BART offers connections to San Francisco from Amtrak's stations in Emeryville, Oakland and Richmond, and Caltrain offers connections in San Jose and Santa Clara. Thruway service also runs south to San Luis Obispo with connection to the Pacific Surfliner.

San Francisco was an early adopter of carsharing in America. The non-profit City CarShare opened in 2001 and Zipcar closely followed.

San Francisco Bay Ferry operates from the Ferry Building and Pier 39 to points in Oakland, Alameda, Bay Farm Island, South San Francisco, Richmond, and north to Vallejo in Solano County. The Golden Gate Ferry is the other ferry operator with service between San Francisco and Marin County. SolTrans runs supplemental bus service between the Ferry Building and Vallejo.

To accommodate the large amount of San Francisco citizens who commute to the Silicon Valley daily, employers like Genentech, Google, and Apple have begun to provide private bus transportation for their employees, from San Francisco locations. These buses have quickly become a heated topic of debate within the city, as protesters claim they block bus lanes and delay public buses.