| Sumner to Cortona | 5,589.29 mi (8,995.09 km) |
| Sumner to Cosenza | 5,935.80 mi (9,552.74 km) |
| Sumner to Cossato | 5,356.87 mi (8,621.05 km) |
| Sumner to Costa Volpino | 5,389.95 mi (8,674.29 km) |
| Sumner to Creazzo | 5,441.53 mi (8,757.29 km) |
| Sumner to Crema | 5,407.08 mi (8,701.86 km) |
| Sumner to Cremona | 5,429.67 mi (8,738.21 km) |
| Sumner to Crevalcore | 5,482.20 mi (8,822.74 km) |
| Sumner to Crispiano | 5,878.75 mi (9,460.93 km) |
| Sumner to Crosia | 5,931.71 mi (9,546.17 km) |
| Sumner to Crotone | 5,969.95 mi (9,607.70 km) |
| Sumner to Cuneo | 5,410.12 mi (8,706.75 km) |
| Sumner to Cuorgne | 5,353.91 mi (8,616.28 km) |
| Sumner to Cusano Milanino | 5,383.69 mi (8,664.21 km) |
| Sumner to Cutro | 5,969.88 mi (9,607.59 km) |
