Watertown, TN -- U.S. city in Tennessee Population (2000): 1358 Housing Units (2000): 605 Land area (2000): 1.252836 sq. miles (3.244830 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.252836 sq. miles (3.244830 sq. km) FIPS code: 78320 Located within: Tennessee (TN), FIPS 47 Location: 36.100039 N, 86.137102 W ZIP Codes (1990): 37184 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Watertown, TN Watertown