Warm River, ID -- U.S. city in Idaho Population (2000): 10 Housing Units (2000): 4 Land area (2000): 0.735747 sq. miles (1.905576 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.735747 sq. miles (1.905576 sq. km) FIPS code: 85420 Located within: Idaho (ID), FIPS 16 Location: 44.114560 N, 111.317528 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Warm River, ID Warm River