| Southborough to Carmona | 989.21 mi (1,591.98 km) |
| Southborough to Cartagena | 938.88 mi (1,510.98 km) |
| Southborough to Cartama | 1,026.99 mi (1,652.78 km) |
| Southborough to Cartaya | 1,025.39 mi (1,650.21 km) |
| Southborough to Caspe | 686.00 mi (1,104.01 km) |
| Southborough to Cassa de la Selva | 652.31 mi (1,049.80 km) |
| Southborough to Castalla | 869.22 mi (1,398.87 km) |
| Southborough to Castellbisbal | 673.98 mi (1,084.67 km) |
| Southborough to Castelldefels | 687.46 mi (1,106.36 km) |
| Southborough to Castello de Ampurias | 629.15 mi (1,012.53 km) |
| Southborough to Castellon de la Plana | 772.37 mi (1,243.01 km) |
| Southborough to Castilleja de la Cuesta | 1,000.90 mi (1,610.79 km) |
| Southborough to Catarroja | 812.97 mi (1,308.35 km) |
| Southborough to Catral | 899.75 mi (1,448.01 km) |
| Southborough to Caudete | 862.73 mi (1,388.43 km) |
