| Boulder to Cognac | 4,918.45 mi (7,915.48 km) |
| Boulder to Cogolin | 5,284.57 mi (8,504.69 km) |
| Boulder to Colmar | 5,087.18 mi (8,187.02 km) |
| Boulder to Colombes | 4,872.52 mi (7,841.56 km) |
| Boulder to Colomiers | 5,072.93 mi (8,164.08 km) |
| Boulder to Combs-la-Ville | 4,894.46 mi (7,876.87 km) |
| Boulder to Comines | 4,818.36 mi (7,754.40 km) |
| Boulder to Compiegne | 4,870.95 mi (7,839.04 km) |
| Boulder to Concarneau | 4,692.16 mi (7,551.31 km) |
| Boulder to Conde-sur-l'Escaut | 4,851.78 mi (7,808.19 km) |
| Boulder to Conflans-Sainte-Honorine | 4,863.81 mi (7,827.54 km) |
| Boulder to Corbas | 5,112.86 mi (8,228.36 km) |
| Boulder to Corbeil-Essonnes | 4,894.18 mi (7,876.41 km) |
| Boulder to Cormeilles-en-Parisis | 4,868.53 mi (7,835.15 km) |
| Boulder to Cosne sur Loire | 4,963.09 mi (7,987.32 km) |
