| Romeoville to Carmona | 4,227.86 mi (6,804.09 km) |
| Romeoville to Cartagena | 4,436.27 mi (7,139.49 km) |
| Romeoville to Cartama | 4,302.54 mi (6,924.27 km) |
| Romeoville to Cartaya | 4,163.97 mi (6,701.27 km) |
| Romeoville to Caspe | 4,340.16 mi (6,984.81 km) |
| Romeoville to Cassa de la Selva | 4,440.68 mi (7,146.58 km) |
| Romeoville to Castalla | 4,411.96 mi (7,100.36 km) |
| Romeoville to Castellbisbal | 4,418.31 mi (7,110.58 km) |
| Romeoville to Castelldefels | 4,425.62 mi (7,122.34 km) |
| Romeoville to Castello de Ampurias | 4,434.99 mi (7,137.42 km) |
| Romeoville to Castellon de la Plana | 4,387.41 mi (7,060.85 km) |
| Romeoville to Castilleja de la Cuesta | 4,211.58 mi (6,777.89 km) |
| Romeoville to Catarroja | 4,393.04 mi (7,069.92 km) |
| Romeoville to Catral | 4,422.71 mi (7,117.67 km) |
| Romeoville to Caudete | 4,393.58 mi (7,070.78 km) |
