| Potomac to Cromer | 3,692.18 mi (5,941.99 km) |
| Potomac to Crosby | 3,509.36 mi (5,647.77 km) |
| Potomac to Crowborough | 3,688.00 mi (5,935.26 km) |
| Potomac to Croxley Green | 3,650.24 mi (5,874.49 km) |
| Potomac to Croydon | 3,669.93 mi (5,906.18 km) |
| Potomac to Cudworth | 3,571.64 mi (5,748.00 km) |
| Potomac to Culcheth | 3,530.33 mi (5,681.52 km) |
| Potomac to Cullercoats | 3,543.69 mi (5,703.02 km) |
| Potomac to Cumbernauld | 3,431.25 mi (5,522.06 km) |
| Potomac to Cumnock | 3,428.49 mi (5,517.62 km) |
| Potomac to Cupar | 3,462.44 mi (5,572.26 km) |
| Potomac to Cwmbran | 3,544.81 mi (5,704.83 km) |
| Potomac to Dagenham | 3,676.49 mi (5,916.74 km) |
| Potomac to Dalkeith | 3,467.31 mi (5,580.10 km) |
| Potomac to Darfield | 3,573.75 mi (5,751.40 km) |
