| Rock Island to Crawfordsville (Indiana) | 216.59 mi (348.56 km) |
| Rock Island to Crest Hill (Illinois) | 127.98 mi (205.97 km) |
| Rock Island to Crestview (Florida) | 773.57 mi (1,244.94 km) |
| Rock Island to Crestwood (Illinois) | 147.48 mi (237.35 km) |
| Rock Island to Crestwood (Missouri) | 201.56 mi (324.38 km) |
| Rock Island to Creve Coeur (Missouri) | 194.15 mi (312.45 km) |
| Rock Island to Crofton (Maryland) | 751.70 mi (1,209.74 km) |
| Rock Island to Crossville (Tennessee) | 484.49 mi (779.71 km) |
| Rock Island to Crowley (Louisiana) | 783.87 mi (1,261.51 km) |
| Rock Island to Crowley (Texas) | 718.56 mi (1,156.41 km) |
| Rock Island to Crown Point (Indiana) | 167.69 mi (269.87 km) |
| Rock Island to Crystal (Minnesota) | 283.33 mi (455.97 km) |
| Rock Island to Crystal Lake (Illinois) | 127.13 mi (204.59 km) |
| Rock Island to Cudahy (California) | 1,587.10 mi (2,554.19 km) |
| Rock Island to Cudahy (Wisconsin) | 172.52 mi (277.65 km) |
