| Rock Island to Candler-McAfee (Georgia) | 636.41 mi (1,024.20 km) |
| Rock Island to Caño Martin Peña (Puerto Rico) | 2,150.33 mi (3,460.61 km) |
| Rock Island to Cañon City (Colorado) | 801.84 mi (1,290.44 km) |
| Rock Island to Canóvanas (Puerto Rico) | 2,159.64 mi (3,475.60 km) |
| Rock Island to Canton (Georgia) | 599.25 mi (964.40 km) |
| Rock Island to Canton (Illinois) | 68.72 mi (110.59 km) |
| Rock Island to Canton (Mississippi) | 613.77 mi (987.77 km) |
| Rock Island to Canton (Ohio) | 481.46 mi (774.83 km) |
| Rock Island to Canyon (Texas) | 759.81 mi (1,222.80 km) |
| Rock Island to Canyon Lake (California) | 1,549.07 mi (2,492.99 km) |
| Rock Island to Canyon Lake (Texas) | 908.69 mi (1,462.39 km) |
| Rock Island to Cape Coral (Florida) | 1,134.70 mi (1,826.13 km) |
| Rock Island to Cape Girardeau (Missouri) | 292.50 mi (470.73 km) |
| Rock Island to Carbondale (Illinois) | 268.86 mi (432.68 km) |
| Rock Island to Carlisle (Pennsylvania) | 704.17 mi (1,133.26 km) |
