| Longmont to Coudekerque-Branche | 4,773.23 mi (7,681.77 km) |
| Longmont to Coueron | 4,788.85 mi (7,706.91 km) |
| Longmont to Coulommiers | 4,893.66 mi (7,875.58 km) |
| Longmont to Courbevoic | 4,860.92 mi (7,822.89 km) |
| Longmont to Courcouronnes | 4,879.12 mi (7,852.19 km) |
| Longmont to Cournon-d'Auvergne | 5,034.78 mi (8,102.70 km) |
| Longmont to Courrieres | 4,816.76 mi (7,751.83 km) |
| Longmont to Coutras | 4,941.67 mi (7,952.85 km) |
| Longmont to Couzeix | 4,956.60 mi (7,976.88 km) |
| Longmont to Cran-Gevrier | 5,132.33 mi (8,259.69 km) |
| Longmont to Craponne | 5,090.14 mi (8,191.78 km) |
| Longmont to Creil | 4,853.22 mi (7,810.50 km) |
| Longmont to Crepy-en-Valois | 4,868.35 mi (7,834.86 km) |
| Longmont to Crest | 5,147.73 mi (8,284.46 km) |
| Longmont to Creteil | 4,872.97 mi (7,842.28 km) |
