| South Portland to Coudekerque-Branche | 3,301.41 mi (5,313.11 km) |
| South Portland to Coueron | 3,225.34 mi (5,190.68 km) |
| South Portland to Coulommiers | 3,387.59 mi (5,451.79 km) |
| South Portland to Courbevoic | 3,350.62 mi (5,392.30 km) |
| South Portland to Courcouronnes | 3,365.39 mi (5,416.07 km) |
| South Portland to Cournon-d'Auvergne | 3,480.53 mi (5,601.38 km) |
| South Portland to Courrieres | 3,338.36 mi (5,372.58 km) |
| South Portland to Coutras | 3,355.18 mi (5,399.64 km) |
| South Portland to Couzeix | 3,391.25 mi (5,457.69 km) |
| South Portland to Cran-Gevrier | 3,601.01 mi (5,795.27 km) |
| South Portland to Craponne | 3,546.54 mi (5,707.60 km) |
| South Portland to Creil | 3,350.62 mi (5,392.30 km) |
| South Portland to Crepy-en-Valois | 3,368.07 mi (5,420.39 km) |
| South Portland to Crest | 3,591.25 mi (5,779.57 km) |
| South Portland to Creteil | 3,362.27 mi (5,411.05 km) |
