Clayton, NJ -- U.S. borough in New Jersey Population (2000): 7139 Housing Units (2000): 2680 Land area (2000): 7.180361 sq. miles (18.597049 sq. km) Water area (2000): 0.170782 sq. miles (0.442323 sq. km) Total area (2000): 7.351143 sq. miles (19.039372 sq. km) FIPS code: 13360 Located within: New Jersey (NJ), FIPS 34 Location: 39.657914 N, 75.087983 W ZIP Codes (1990): 08312 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Clayton, NJ Clayton