| Portland to Cognac | 5,221.45 mi (8,403.11 km) |
| Portland to Cogolin | 5,555.22 mi (8,940.26 km) |
| Portland to Colmar | 5,298.68 mi (8,527.41 km) |
| Portland to Colombes | 5,116.86 mi (8,234.79 km) |
| Portland to Colomiers | 5,385.58 mi (8,667.25 km) |
| Portland to Combs-la-Ville | 5,139.28 mi (8,270.88 km) |
| Portland to Comines | 5,035.04 mi (8,103.12 km) |
| Portland to Compiegne | 5,104.96 mi (8,215.63 km) |
| Portland to Concarneau | 4,997.65 mi (8,042.95 km) |
| Portland to Conde-sur-l'Escaut | 5,067.55 mi (8,155.43 km) |
| Portland to Conflans-Sainte-Honorine | 5,108.50 mi (8,221.34 km) |
| Portland to Corbas | 5,371.97 mi (8,645.35 km) |
| Portland to Corbeil-Essonnes | 5,140.28 mi (8,272.48 km) |
| Portland to Cormeilles-en-Parisis | 5,112.70 mi (8,228.09 km) |
| Portland to Cosne sur Loire | 5,219.44 mi (8,399.88 km) |
