Erma, NJ -- U.S. Census Designated Place in New Jersey Population (2000): 2088 Housing Units (2000): 846 Land area (2000): 3.349651 sq. miles (8.675557 sq. km) Water area (2000): 0.019111 sq. miles (0.049496 sq. km) Total area (2000): 3.368762 sq. miles (8.725053 sq. km) FIPS code: 21660 Located within: New Jersey (NJ), FIPS 34 Location: 39.002830 N, 74.888621 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Erma, NJ Erma