| Rock Island to Cold Springs (Nevada) | 1,539.95 mi (2,478.30 km) |
| Rock Island to Coldwater (Michigan) | 289.84 mi (466.46 km) |
| Rock Island to Colesville (Maryland) | 734.05 mi (1,181.34 km) |
| Rock Island to College (Alaska) | 2,728.46 mi (4,391.04 km) |
| Rock Island to College Park (Georgia) | 636.21 mi (1,023.87 km) |
| Rock Island to College Park (Maryland) | 739.10 mi (1,189.47 km) |
| Rock Island to College Station (Texas) | 816.51 mi (1,314.04 km) |
| Rock Island to Collegedale (Tennessee) | 535.20 mi (861.31 km) |
| Rock Island to Colleyville (Texas) | 693.72 mi (1,116.43 km) |
| Rock Island to Collierville (Tennessee) | 446.36 mi (718.34 km) |
| Rock Island to Collinsville (Illinois) | 195.36 mi (314.40 km) |
| Rock Island to Colonia (New Jersey) | 848.80 mi (1,366.01 km) |
| Rock Island to Colonial Heights (Virginia) | 760.87 mi (1,224.51 km) |
| Rock Island to Colonial Park (Pennsylvania) | 723.36 mi (1,164.13 km) |
| Rock Island to Colorado Springs (Colorado) | 768.88 mi (1,237.39 km) |
