| Williamsport to Cocentaina | 3,919.95 mi (6,308.56 km) |
| Williamsport to Coin | 3,782.76 mi (6,087.76 km) |
| Williamsport to Colindres | 3,634.79 mi (5,849.63 km) |
| Williamsport to Collado-Villalba | 3,691.38 mi (5,940.71 km) |
| Williamsport to Colmenar Viejo | 3,701.98 mi (5,957.76 km) |
| Williamsport to Colmenarejo | 3,693.21 mi (5,943.65 km) |
| Williamsport to Conil de la Frontera | 3,730.95 mi (6,004.39 km) |
| Williamsport to Consuegra | 3,746.94 mi (6,030.12 km) |
| Williamsport to Corbera de Llobregat | 3,941.36 mi (6,343.01 km) |
| Williamsport to Cordoba | 3,741.42 mi (6,021.23 km) |
| Williamsport to Coria del Rio | 3,699.38 mi (5,953.57 km) |
| Williamsport to Crevillente | 3,919.20 mi (6,307.34 km) |
| Williamsport to Cuarte de Huerva | 3,805.57 mi (6,124.48 km) |
| Williamsport to Cubellas | 3,936.39 mi (6,335.01 km) |
| Williamsport to Cuellar | 3,653.76 mi (5,880.15 km) |
