Nampa, ID -- U.S. city in Idaho Population (2000): 51867 Housing Units (2000): 19379 Land area (2000): 19.854817 sq. miles (51.423737 sq. km) Water area (2000): 0.018499 sq. miles (0.047913 sq. km) Total area (2000): 19.873316 sq. miles (51.471650 sq. km) FIPS code: 56260 Located within: Idaho (ID), FIPS 16 Location: 43.574807 N, 116.563559 W ZIP Codes (1990): 83651 83686 83687 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Nampa, ID Nampa