Newark, CA -- U.S. city in California Population (2000): 42471 Housing Units (2000): 13150 Land area (2000): 13.973269 sq. miles (36.190599 sq. km) Water area (2000): 0.025289 sq. miles (0.065499 sq. km) Total area (2000): 13.998558 sq. miles (36.256098 sq. km) FIPS code: 50916 Located within: California (CA), FIPS 06 Location: 37.535586 N, 122.033629 W ZIP Codes (1990): 94560 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Newark, CA Newark