Allentown, NJ -- U.S. borough in New Jersey Population (2000): 1882 Housing Units (2000): 718 Land area (2000): 0.607660 sq. miles (1.573832 sq. km) Water area (2000): 0.017272 sq. miles (0.044733 sq. km) Total area (2000): 0.624932 sq. miles (1.618565 sq. km) FIPS code: 00760 Located within: New Jersey (NJ), FIPS 34 Location: 40.176049 N, 74.584910 W ZIP Codes (1990): 08501 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Allentown, NJ Allentown