| Potomac to Busto Arsizio | 4,203.24 mi (6,764.45 km) |
| Potomac to Busto Garolfo | 4,206.78 mi (6,770.15 km) |
| Potomac to Cabras | 4,377.38 mi (7,044.72 km) |
| Potomac to Cadelbosco di Sopra | 4,305.83 mi (6,929.57 km) |
| Potomac to Cadoneghe | 4,339.88 mi (6,984.36 km) |
| Potomac to Cagli | 4,435.68 mi (7,138.54 km) |
| Potomac to Cagliari | 4,428.49 mi (7,126.96 km) |
| Potomac to Cairo Montenotte | 4,216.64 mi (6,786.03 km) |
| Potomac to Caivano | 4,601.05 mi (7,404.68 km) |
| Potomac to Calcinaia | 4,342.84 mi (6,989.13 km) |
| Potomac to Calcinato | 4,275.07 mi (6,880.06 km) |
| Potomac to Calderara di Reno | 4,341.19 mi (6,986.46 km) |
| Potomac to Caldogno | 4,316.27 mi (6,946.37 km) |
| Potomac to Calenzano | 4,360.55 mi (7,017.63 km) |
| Potomac to Calolziocorte | 4,222.11 mi (6,794.84 km) |
