Dallas City, IL -- U.S. city in Illinois Population (2000): 1055 Housing Units (2000): 503 Land area (2000): 2.375209 sq. miles (6.151763 sq. km) Water area (2000): 0.904617 sq. miles (2.342948 sq. km) Total area (2000): 3.279826 sq. miles (8.494711 sq. km) FIPS code: 18420 Located within: Illinois (IL), FIPS 17 Location: 40.636565 N, 91.165256 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Dallas City, IL Dallas City