| Letterkenny to Cognac | 717.20 mi (1,154.23 km) |
| Letterkenny to Cogolin | 1,030.05 mi (1,657.70 km) |
| Letterkenny to Colmar | 800.86 mi (1,288.85 km) |
| Letterkenny to Colombes | 594.08 mi (956.07 km) |
| Letterkenny to Colomiers | 881.96 mi (1,419.38 km) |
| Letterkenny to Combs-la-Ville | 616.48 mi (992.13 km) |
| Letterkenny to Comines | 532.35 mi (856.74 km) |
| Letterkenny to Compiegne | 587.20 mi (945.01 km) |
| Letterkenny to Concarneau | 515.77 mi (830.05 km) |
| Letterkenny to Conde-sur-l'Escaut | 565.74 mi (910.48 km) |
| Letterkenny to Conflans-Sainte-Honorine | 585.53 mi (942.32 km) |
| Letterkenny to Corbas | 847.15 mi (1,363.35 km) |
| Letterkenny to Corbeil-Essonnes | 617.06 mi (993.06 km) |
| Letterkenny to Cormeilles-en-Parisis | 589.95 mi (949.43 km) |
| Letterkenny to Cosne sur Loire | 694.49 mi (1,117.67 km) |
