| Portes-les-Valence to Cognac | 259.31 mi (417.32 km) |
| Portes-les-Valence to Cogolin | 138.85 mi (223.46 km) |
| Portes-les-Valence to Colmar | 251.08 mi (404.07 km) |
| Portes-les-Valence to Colombes | 306.00 mi (492.46 km) |
| Portes-les-Valence to Colomiers | 195.60 mi (314.79 km) |
| Portes-les-Valence to Combs-la-Ville | 284.27 mi (457.49 km) |
| Portes-les-Valence to Comines | 415.91 mi (669.34 km) |
| Portes-les-Valence to Compiegne | 328.26 mi (528.29 km) |
| Portes-les-Valence to Concarneau | 467.40 mi (752.20 km) |
| Portes-les-Valence to Conde-sur-l'Escaut | 389.86 mi (627.42 km) |
| Portes-les-Valence to Conflans-Sainte-Honorine | 313.70 mi (504.86 km) |
| Portes-les-Valence to Corbas | 54.93 mi (88.40 km) |
| Portes-les-Valence to Corbeil-Essonnes | 282.18 mi (454.13 km) |
| Portes-les-Valence to Cormeilles-en-Parisis | 310.12 mi (499.09 km) |
| Portes-les-Valence to Cosne sur Loire | 198.61 mi (319.64 km) |
