| Dubuque to Cognac | 4,236.04 mi (6,817.24 km) |
| Dubuque to Cogolin | 4,609.67 mi (7,418.55 km) |
| Dubuque to Colmar | 4,442.85 mi (7,150.08 km) |
| Dubuque to Colombes | 4,217.11 mi (6,786.78 km) |
| Dubuque to Colomiers | 4,383.94 mi (7,055.27 km) |
| Dubuque to Combs-la-Ville | 4,238.38 mi (6,821.01 km) |
| Dubuque to Comines | 4,177.34 mi (6,722.77 km) |
| Dubuque to Compiegne | 4,220.44 mi (6,792.14 km) |
| Dubuque to Concarneau | 4,012.70 mi (6,457.82 km) |
| Dubuque to Conde-sur-l'Escaut | 4,210.47 mi (6,776.10 km) |
| Dubuque to Conflans-Sainte-Honorine | 4,208.41 mi (6,772.78 km) |
| Dubuque to Corbas | 4,446.04 mi (7,155.21 km) |
| Dubuque to Corbeil-Essonnes | 4,237.50 mi (6,819.60 km) |
| Dubuque to Cormeilles-en-Parisis | 4,213.29 mi (6,780.64 km) |
| Dubuque to Cosne sur Loire | 4,300.33 mi (6,920.72 km) |
