| Duncan to Cortona | 5,484.00 mi (8,825.64 km) |
| Duncan to Cosenza | 5,829.36 mi (9,381.45 km) |
| Duncan to Cossato | 5,238.26 mi (8,430.17 km) |
| Duncan to Costa Volpino | 5,303.18 mi (8,534.64 km) |
| Duncan to Creazzo | 5,368.95 mi (8,640.49 km) |
| Duncan to Crema | 5,305.97 mi (8,539.13 km) |
| Duncan to Cremona | 5,329.24 mi (8,576.58 km) |
| Duncan to Crevalcore | 5,390.21 mi (8,674.71 km) |
| Duncan to Crispiano | 5,809.38 mi (9,349.29 km) |
| Duncan to Crosia | 5,838.02 mi (9,395.39 km) |
| Duncan to Crotone | 5,874.13 mi (9,453.51 km) |
| Duncan to Cuneo | 5,260.78 mi (8,466.41 km) |
| Duncan to Cuorgne | 5,224.82 mi (8,408.54 km) |
| Duncan to Cusano Milanino | 5,278.93 mi (8,495.61 km) |
| Duncan to Cutro | 5,871.05 mi (9,448.54 km) |
