| South Portland to Cognac | 3,327.61 mi (5,355.27 km) |
| South Portland to Cogolin | 3,705.40 mi (5,963.27 km) |
| South Portland to Colmar | 3,586.63 mi (5,772.12 km) |
| South Portland to Colombes | 3,349.89 mi (5,391.13 km) |
| South Portland to Colomiers | 3,463.12 mi (5,573.36 km) |
| South Portland to Combs-la-Ville | 3,369.62 mi (5,422.89 km) |
| South Portland to Comines | 3,333.07 mi (5,364.05 km) |
| South Portland to Compiegne | 3,360.58 mi (5,408.32 km) |
| South Portland to Concarneau | 3,113.35 mi (5,010.46 km) |
| South Portland to Conde-sur-l'Escaut | 3,364.83 mi (5,415.17 km) |
| South Portland to Conflans-Sainte-Honorine | 3,341.44 mi (5,377.52 km) |
| South Portland to Corbas | 3,556.63 mi (5,723.84 km) |
| South Portland to Corbeil-Essonnes | 3,367.87 mi (5,420.07 km) |
| South Portland to Cormeilles-en-Parisis | 3,346.42 mi (5,385.55 km) |
| South Portland to Cosne sur Loire | 3,420.08 mi (5,504.08 km) |
