| Rock Island to Cloverleaf (Texas) | 846.93 mi (1,363.01 km) |
| Rock Island to Cloverly (Maryland) | 733.44 mi (1,180.36 km) |
| Rock Island to Clovis (California) | 1,584.02 mi (2,549.23 km) |
| Rock Island to Clovis (New Mexico) | 840.02 mi (1,351.87 km) |
| Rock Island to Clute (Texas) | 901.31 mi (1,450.51 km) |
| Rock Island to Coachella (California) | 1,492.38 mi (2,401.75 km) |
| Rock Island to Coalinga (California) | 1,634.48 mi (2,630.44 km) |
| Rock Island to Coamo (Puerto Rico) | 2,157.69 mi (3,472.46 km) |
| Rock Island to Coatesville (Pennsylvania) | 778.79 mi (1,253.34 km) |
| Rock Island to Cockeysville (Maryland) | 745.27 mi (1,199.39 km) |
| Rock Island to Cocoa (Florida) | 1,059.87 mi (1,705.70 km) |
| Rock Island to Cocoa Beach (Florida) | 1,066.98 mi (1,717.14 km) |
| Rock Island to Coconut Creek (Florida) | 1,205.01 mi (1,939.27 km) |
| Rock Island to Coeur d'Alene (Idaho) | 1,352.11 mi (2,176.02 km) |
| Rock Island to Cohoes (New York) | 868.02 mi (1,396.94 km) |
