| Rockford to Castle Pines (Colorado) | 846.93 mi (1,363.00 km) |
| Rockford to Castle Rock (Colorado) | 847.95 mi (1,364.64 km) |
| Rockford to Castro Valley (California) | 1,763.64 mi (2,838.30 km) |
| Rockford to Catalina Foothills (Arizona) | 1,376.82 mi (2,215.78 km) |
| Rockford to Cataño (Puerto Rico) | 2,124.89 mi (3,419.68 km) |
| Rockford to Cathedral City (California) | 1,591.77 mi (2,561.71 km) |
| Rockford to Catonsville (Maryland) | 676.49 mi (1,088.70 km) |
| Rockford to Cave Spring (Virginia) | 593.17 mi (954.62 km) |
| Rockford to Cayce (South Carolina) | 720.47 mi (1,159.49 km) |
| Rockford to Cayey (Puerto Rico) | 2,142.63 mi (3,448.23 km) |
| Rockford to Cedar City (Utah) | 1,306.39 mi (2,102.43 km) |
| Rockford to Cedar Falls (Iowa) | 173.89 mi (279.85 km) |
| Rockford to Cedar Hill (Texas) | 795.96 mi (1,280.97 km) |
| Rockford to Cedar Lake (Indiana) | 103.85 mi (167.12 km) |
| Rockford to Cedar Mill (Oregon) | 1,682.23 mi (2,707.29 km) |
