| Sumner to Cividale del Friuli | 5,453.65 mi (8,776.80 km) |
| Sumner to Civita Castellana | 5,658.76 mi (9,106.89 km) |
| Sumner to Civitanova Marche | 5,630.40 mi (9,061.26 km) |
| Sumner to Civitavecchia | 5,655.24 mi (9,101.24 km) |
| Sumner to Civitella in Val di Chiana | 5,574.08 mi (8,970.61 km) |
| Sumner to Clusone | 5,383.14 mi (8,663.32 km) |
| Sumner to Coccaglio | 5,402.80 mi (8,694.97 km) |
| Sumner to Codigoro | 5,498.82 mi (8,849.50 km) |
| Sumner to Codogno | 5,419.86 mi (8,722.42 km) |
| Sumner to Codroipo | 5,451.38 mi (8,773.15 km) |
| Sumner to Cogoleto | 5,438.36 mi (8,752.19 km) |
| Sumner to Colle di Val d'Elsa | 5,560.49 mi (8,948.74 km) |
| Sumner to Colle Salvetti | 5,532.15 mi (8,903.13 km) |
| Sumner to Collecchio | 5,457.01 mi (8,782.21 km) |
| Sumner to Colleferro | 5,707.87 mi (9,185.93 km) |
