| Rock Island to Central Point (Oregon) | 1,653.08 mi (2,660.37 km) |
| Rock Island to Centralia (Illinois) | 217.80 mi (350.52 km) |
| Rock Island to Centralia (Washington) | 1,635.18 mi (2,631.57 km) |
| Rock Island to Centreville (Virginia) | 716.71 mi (1,153.44 km) |
| Rock Island to Ceres (California) | 1,632.24 mi (2,626.84 km) |
| Rock Island to Cerritos (California) | 1,584.29 mi (2,549.67 km) |
| Rock Island to Chalco (Nebraska) | 288.74 mi (464.69 km) |
| Rock Island to Chalmette (Louisiana) | 797.12 mi (1,282.84 km) |
| Rock Island to Chambersburg (Pennsylvania) | 684.76 mi (1,102.02 km) |
| Rock Island to Chamblee (Georgia) | 626.25 mi (1,007.86 km) |
| Rock Island to Champaign (Illinois) | 152.84 mi (245.97 km) |
| Rock Island to Champlin (Minnesota) | 291.99 mi (469.91 km) |
| Rock Island to Chandler (Arizona) | 1,292.87 mi (2,080.68 km) |
| Rock Island to Chanhassen (Minnesota) | 277.87 mi (447.19 km) |
| Rock Island to Channahon (Illinois) | 120.34 mi (193.68 km) |
