| Duncan to Cognac | 4,888.11 mi (7,866.66 km) |
| Duncan to Cogolin | 5,263.87 mi (8,471.38 km) |
| Duncan to Colmar | 5,107.70 mi (8,220.05 km) |
| Duncan to Colombes | 4,879.43 mi (7,852.68 km) |
| Duncan to Colomiers | 5,032.26 mi (8,098.64 km) |
| Duncan to Combs-la-Ville | 4,900.44 mi (7,886.50 km) |
| Duncan to Comines | 4,843.54 mi (7,794.93 km) |
| Duncan to Compiegne | 4,884.16 mi (7,860.30 km) |
| Duncan to Concarneau | 4,666.88 mi (7,510.61 km) |
| Duncan to Conde-sur-l'Escaut | 4,876.54 mi (7,848.03 km) |
| Duncan to Conflans-Sainte-Honorine | 4,870.76 mi (7,838.73 km) |
| Duncan to Corbas | 5,103.94 mi (8,214.00 km) |
| Duncan to Corbeil-Essonnes | 4,899.39 mi (7,884.80 km) |
| Duncan to Cormeilles-en-Parisis | 4,875.67 mi (7,846.63 km) |
| Duncan to Cosne sur Loire | 4,960.08 mi (7,982.48 km) |
