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California Park is an unincorporated community in Marin County, California, United States, and a suburb of San Rafael. It lies north of San Quentin State Prison. Marin Sanitary Service is the largest tenant in the area.
The community is in ZIP code 94901 and area codes 415 and 628.
The Cal Park Hill Tunnel
The Cal Park Hill Tunnel runs for 1,106 feet through the hill to Larkspur. It opened in 1884 and was a double-track train tunnel owned by Northwestern Pacific Railroad. Train service stopped in the 1960s. It is now owned by Sonoma-Marin Area Rail Transit (SMART). After a $27 million project, jointly funded by SMART and Marin County, half of the tunnel reopened in December 10, 2010 as a bicycle and pedestrian path. Sonoma-Marin Area Rail Transit plans to use the other half to extend their planned commuter rail line from downtown San Rafael to the Larkspur ferry terminal.