| Rock Island to Clarksdale (Mississippi) | 502.76 mi (809.12 km) |
| Rock Island to Clarkston (Georgia) | 632.33 mi (1,017.64 km) |
| Rock Island to Clarksville (Indiana) | 335.26 mi (539.54 km) |
| Rock Island to Clarksville (Tennessee) | 380.62 mi (612.55 km) |
| Rock Island to Clawson (Michigan) | 388.52 mi (625.26 km) |
| Rock Island to Clay (Alabama) | 579.40 mi (932.45 km) |
| Rock Island to Clayton (California) | 1,674.73 mi (2,695.22 km) |
| Rock Island to Clayton (Missouri) | 195.68 mi (314.91 km) |
| Rock Island to Clayton (North Carolina) | 767.56 mi (1,235.27 km) |
| Rock Island to Clayton (Ohio) | 345.79 mi (556.49 km) |
| Rock Island to Clearfield (Utah) | 1,110.62 mi (1,787.36 km) |
| Rock Island to Clearlake (California) | 1,690.19 mi (2,720.10 km) |
| Rock Island to Clearwater (Florida) | 1,031.39 mi (1,659.86 km) |
| Rock Island to Cleburne (Texas) | 733.52 mi (1,180.49 km) |
| Rock Island to Clemmons (North Carolina) | 664.89 mi (1,070.03 km) |
