Interlaken, NJ -- U.S. borough in New Jersey Population (2000): 900 Housing Units (2000): 397 Land area (2000): 0.352081 sq. miles (0.911885 sq. km) Water area (2000): 0.043397 sq. miles (0.112398 sq. km) Total area (2000): 0.395478 sq. miles (1.024283 sq. km) FIPS code: 34200 Located within: New Jersey (NJ), FIPS 34 Location: 40.235522 N, 74.014930 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Interlaken, NJ Interlaken