Folsom, NJ -- U.S. borough in New Jersey Population (2000): 1972 Housing Units (2000): 702 Land area (2000): 8.269938 sq. miles (21.419041 sq. km) Water area (2000): 0.185366 sq. miles (0.480096 sq. km) Total area (2000): 8.455304 sq. miles (21.899137 sq. km) FIPS code: 23940 Located within: New Jersey (NJ), FIPS 34 Location: 39.592363 N, 74.847887 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Folsom, NJ Folsom