Rock Falls, IA (city, FIPS 68025)
Location: 43.20722 N, 93.08703 W
Population (1990): 130 (56 housing units)
Area: 0.5 sq km (land), 0.0 sq km (water)
Zip code(s): 50467
Rock Falls, IL (city, FIPS 64928)
Location: 41.77417 N, 89.69111 W
Population (1990): 9654 (3891 housing units)
Area: 7.8 sq km (land), 0.3 sq km (water)
Zip code(s): 61071