Plymouth, CA -- U.S. city in California Population (2000): 980 Housing Units (2000): 457 Land area (2000): 0.924043 sq. miles (2.393261 sq. km) Water area (2000): 0.010118 sq. miles (0.026205 sq. km) Total area (2000): 0.934161 sq. miles (2.419466 sq. km) FIPS code: 57834 Located within: California (CA), FIPS 06 Location: 38.479339 N, 120.847721 W ZIP Codes (1990): 95669 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Plymouth, CA Plymouth