Caldwell, NJ -- U.S. borough in New Jersey Population (2000): 7584 Housing Units (2000): 3396 Land area (2000): 1.185675 sq. miles (3.070885 sq. km) Water area (2000): 0.000777 sq. miles (0.002013 sq. km) Total area (2000): 1.186452 sq. miles (3.072898 sq. km) FIPS code: 09220 Located within: New Jersey (NJ), FIPS 34 Location: 40.838932 N, 74.277033 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Caldwell, NJ Caldwell