| Potomac to Cockermouth | 3,475.93 mi (5,593.98 km) |
| Potomac to Colchester | 3,699.41 mi (5,953.63 km) |
| Potomac to Coleford | 3,558.65 mi (5,727.09 km) |
| Potomac to Colne | 3,536.48 mi (5,691.42 km) |
| Potomac to Colwyn Bay | 3,486.44 mi (5,610.88 km) |
| Potomac to Congleton | 3,547.91 mi (5,709.80 km) |
| Potomac to Conisbrough | 3,580.98 mi (5,763.04 km) |
| Potomac to Connahs Quay | 3,513.39 mi (5,654.25 km) |
| Potomac to Consett | 3,531.77 mi (5,683.84 km) |
| Potomac to Conwy | 3,481.43 mi (5,602.81 km) |
| Potomac to Cookstown | 3,344.37 mi (5,382.24 km) |
| Potomac to Corby | 3,621.96 mi (5,828.99 km) |
| Potomac to Corfe Mullen | 3,604.47 mi (5,800.83 km) |
| Potomac to Corsham | 3,583.60 mi (5,767.24 km) |
| Potomac to Coseley | 3,565.18 mi (5,737.60 km) |
