| Romeoville to Cadillac (Michigan) | 226.09 mi (363.85 km) |
| Romeoville to Caguas (Puerto Rico) | 2,074.74 mi (3,338.98 km) |
| Romeoville to Cahokia (Illinois) | 238.69 mi (384.13 km) |
| Romeoville to Calabasas (California) | 1,735.11 mi (2,792.38 km) |
| Romeoville to Caldwell (Idaho) | 1,451.07 mi (2,335.27 km) |
| Romeoville to Caledonia (Wisconsin) | 81.43 mi (131.04 km) |
| Romeoville to Calera (Alabama) | 592.40 mi (953.38 km) |
| Romeoville to Calexico (California) | 1,621.44 mi (2,609.45 km) |
| Romeoville to Calhoun (Georgia) | 522.38 mi (840.70 km) |
| Romeoville to California (Maryland) | 655.66 mi (1,055.19 km) |
| Romeoville to California City (California) | 1,663.89 mi (2,677.77 km) |
| Romeoville to Callaway (Florida) | 806.90 mi (1,298.59 km) |
| Romeoville to Calumet City (Illinois) | 28.39 mi (45.70 km) |
| Romeoville to Calverton (Maryland) | 613.03 mi (986.57 km) |
| Romeoville to Camano (Washington) | 1,725.94 mi (2,777.63 km) |
