| Dubuque to Coudekerque-Branche | 4,144.89 mi (6,670.56 km) |
| Dubuque to Coueron | 4,124.05 mi (6,637.02 km) |
| Dubuque to Coulommiers | 4,252.87 mi (6,844.34 km) |
| Dubuque to Courbevoic | 4,218.10 mi (6,788.38 km) |
| Dubuque to Courcouronnes | 4,235.11 mi (6,815.75 km) |
| Dubuque to Cournon-d'Auvergne | 4,375.77 mi (7,042.12 km) |
| Dubuque to Courrieres | 4,186.28 mi (6,737.17 km) |
| Dubuque to Coutras | 4,268.85 mi (6,870.04 km) |
| Dubuque to Couzeix | 4,292.45 mi (6,908.03 km) |
| Dubuque to Cran-Gevrier | 4,483.51 mi (7,215.51 km) |
| Dubuque to Craponne | 4,435.93 mi (7,138.94 km) |
| Dubuque to Creil | 4,213.42 mi (6,780.85 km) |
| Dubuque to Crepy-en-Valois | 4,229.64 mi (6,806.95 km) |
| Dubuque to Crest | 4,488.71 mi (7,223.89 km) |
| Dubuque to Creteil | 4,230.11 mi (6,807.71 km) |
