| Rock Island to Cibolo (Texas) | 926.86 mi (1,491.63 km) |
| Rock Island to Cicero (Illinois) | 148.02 mi (238.22 km) |
| Rock Island to Cimarron Hills (Colorado) | 765.92 mi (1,232.63 km) |
| Rock Island to Cincinnati (Ohio) | 358.22 mi (576.50 km) |
| Rock Island to Cinco Ranch (Texas) | 860.66 mi (1,385.10 km) |
| Rock Island to Circleville (Ohio) | 421.62 mi (678.53 km) |
| Rock Island to Citrus (California) | 1,567.31 mi (2,522.34 km) |
| Rock Island to Citrus Heights (California) | 1,625.89 mi (2,616.62 km) |
| Rock Island to Citrus Park (Florida) | 1,030.32 mi (1,658.14 km) |
| Rock Island to Claiborne (Louisiana) | 623.51 mi (1,003.44 km) |
| Rock Island to Claremont (California) | 1,558.14 mi (2,507.58 km) |
| Rock Island to Claremont (New Hampshire) | 937.96 mi (1,509.50 km) |
| Rock Island to Claremore (Oklahoma) | 446.98 mi (719.34 km) |
| Rock Island to Clarksburg (Maryland) | 717.41 mi (1,154.56 km) |
| Rock Island to Clarksburg (West Virginia) | 560.29 mi (901.70 km) |
