| Duncan to Coudekerque-Branche | 4,811.15 mi (7,742.79 km) |
| Duncan to Coueron | 4,778.70 mi (7,690.57 km) |
| Duncan to Coulommiers | 4,915.65 mi (7,910.98 km) |
| Duncan to Courbevoic | 4,880.37 mi (7,854.20 km) |
| Duncan to Courcouronnes | 4,896.97 mi (7,880.91 km) |
| Duncan to Cournon-d'Auvergne | 5,031.99 mi (8,098.21 km) |
| Duncan to Courrieres | 4,851.95 mi (7,808.45 km) |
| Duncan to Coutras | 4,919.33 mi (7,916.90 km) |
| Duncan to Couzeix | 4,946.82 mi (7,961.13 km) |
| Duncan to Cran-Gevrier | 5,143.17 mi (8,277.13 km) |
| Duncan to Craponne | 5,093.81 mi (8,197.69 km) |
| Duncan to Creil | 4,876.58 mi (7,848.10 km) |
| Duncan to Crepy-en-Valois | 4,893.07 mi (7,874.64 km) |
| Duncan to Crest | 5,144.59 mi (8,279.42 km) |
| Duncan to Creteil | 4,892.34 mi (7,873.46 km) |
