Buena, NJ -- U.S. borough in New Jersey Population (2000): 3873 Housing Units (2000): 1553 Land area (2000): 7.607274 sq. miles (19.702749 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 7.607274 sq. miles (19.702749 sq. km) FIPS code: 08680 Located within: New Jersey (NJ), FIPS 34 Location: 39.523475 N, 74.945736 W ZIP Codes (1990): 08310 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Buena, NJ Buena