| Rock Island to Cullman (Alabama) | 543.52 mi (874.71 km) |
| Rock Island to Culpeper (Virginia) | 697.00 mi (1,121.72 km) |
| Rock Island to Culver City (California) | 1,596.66 mi (2,569.57 km) |
| Rock Island to Cumberland (Maryland) | 632.72 mi (1,018.27 km) |
| Rock Island to Cupertino (California) | 1,694.75 mi (2,727.43 km) |
| Rock Island to Cutler Bay (Florida) | 1,244.50 mi (2,002.83 km) |
| Rock Island to Cutlerville (Michigan) | 268.64 mi (432.34 km) |
| Rock Island to Cuyahoga Falls (Ohio) | 470.52 mi (757.23 km) |
| Rock Island to Cypress (California) | 1,584.38 mi (2,549.81 km) |
| Rock Island to Cypress Gardens (Florida) | 1,057.28 mi (1,701.53 km) |
| Rock Island to Cypress Lake (Florida) | 1,143.72 mi (1,840.64 km) |
| Rock Island to D'Iberville (Mississippi) | 765.71 mi (1,232.29 km) |
| Rock Island to Dakota Ridge (Colorado) | 773.69 mi (1,245.13 km) |
| Rock Island to Dale City (Virginia) | 725.83 mi (1,168.10 km) |
| Rock Island to Dallas (Georgia) | 608.73 mi (979.66 km) |
