| Rock Island to Carrollwood (Florida) | 1,032.48 mi (1,661.61 km) |
| Rock Island to Carson (California) | 1,594.80 mi (2,566.58 km) |
| Rock Island to Carson City (Nevada) | 1,537.61 mi (2,474.55 km) |
| Rock Island to Carteret (New Jersey) | 853.36 mi (1,373.35 km) |
| Rock Island to Cartersville (Georgia) | 594.95 mi (957.48 km) |
| Rock Island to Carthage (Missouri) | 359.14 mi (577.99 km) |
| Rock Island to Cary (Illinois) | 130.61 mi (210.20 km) |
| Rock Island to Cary (North Carolina) | 745.72 mi (1,200.13 km) |
| Rock Island to Casa de Oro-Mount Helix (California) | 1,565.37 mi (2,519.22 km) |
| Rock Island to Casa Grande (Arizona) | 1,302.51 mi (2,096.19 km) |
| Rock Island to Casas Adobes (Arizona) | 1,288.18 mi (2,073.12 km) |
| Rock Island to Cascades (Virginia) | 714.84 mi (1,150.43 km) |
| Rock Island to Casper (Wyoming) | 810.46 mi (1,304.31 km) |
| Rock Island to Casselberry (Florida) | 1,026.80 mi (1,652.48 km) |
| Rock Island to Castaic (California) | 1,593.99 mi (2,565.29 km) |
