| Rockford to Cadillac (Michigan) | 229.29 mi (369.01 km) |
| Rockford to Caguas (Puerto Rico) | 2,140.51 mi (3,444.82 km) |
| Rockford to Cahokia (Illinois) | 261.92 mi (421.52 km) |
| Rockford to Calabasas (California) | 1,692.43 mi (2,723.70 km) |
| Rockford to Caldwell (Idaho) | 1,392.36 mi (2,240.79 km) |
| Rockford to Caledonia (Wisconsin) | 71.02 mi (114.30 km) |
| Rockford to Calera (Alabama) | 643.65 mi (1,035.85 km) |
| Rockford to Calexico (California) | 1,584.53 mi (2,550.05 km) |
| Rockford to Calhoun (Georgia) | 581.22 mi (935.38 km) |
| Rockford to California (Maryland) | 715.99 mi (1,152.27 km) |
| Rockford to California City (California) | 1,619.90 mi (2,606.98 km) |
| Rockford to Callaway (Florida) | 860.04 mi (1,384.10 km) |
| Rockford to Calumet City (Illinois) | 89.69 mi (144.34 km) |
| Rockford to Calverton (Maryland) | 671.72 mi (1,081.02 km) |
| Rockford to Camano (Washington) | 1,662.27 mi (2,675.17 km) |
