| Boulder to Coudekerque-Branche | 4,786.00 mi (7,702.32 km) |
| Boulder to Coueron | 4,801.55 mi (7,727.36 km) |
| Boulder to Coulommiers | 4,906.42 mi (7,896.12 km) |
| Boulder to Courbevoic | 4,873.68 mi (7,843.42 km) |
| Boulder to Courcouronnes | 4,891.88 mi (7,872.72 km) |
| Boulder to Cournon-d'Auvergne | 5,047.51 mi (8,123.18 km) |
| Boulder to Courrieres | 4,829.53 mi (7,772.38 km) |
| Boulder to Coutras | 4,954.35 mi (7,973.25 km) |
| Boulder to Couzeix | 4,969.31 mi (7,997.33 km) |
| Boulder to Cran-Gevrier | 5,145.08 mi (8,280.21 km) |
| Boulder to Craponne | 5,102.88 mi (8,212.28 km) |
| Boulder to Creil | 4,865.98 mi (7,831.04 km) |
| Boulder to Crepy-en-Valois | 4,881.12 mi (7,855.40 km) |
| Boulder to Crest | 5,160.45 mi (8,304.95 km) |
| Boulder to Creteil | 4,885.72 mi (7,862.81 km) |
