| Potomac to Cosham | 3,642.35 mi (5,861.80 km) |
| Potomac to Costessey | 3,694.76 mi (5,946.14 km) |
| Potomac to Cottingham | 3,606.91 mi (5,804.76 km) |
| Potomac to Coulsdon | 3,669.91 mi (5,906.14 km) |
| Potomac to Coventry | 3,591.07 mi (5,779.27 km) |
| Potomac to Cowdenbeath | 3,452.97 mi (5,557.02 km) |
| Potomac to Cowes | 3,634.47 mi (5,849.12 km) |
| Potomac to Cowley | 3,651.37 mi (5,876.31 km) |
| Potomac to Cowley | 3,617.04 mi (5,821.07 km) |
| Potomac to Cramlington | 3,537.00 mi (5,692.25 km) |
| Potomac to Cranleigh | 3,660.09 mi (5,890.34 km) |
| Potomac to Crawley | 3,672.64 mi (5,910.55 km) |
| Potomac to Crayford | 3,680.10 mi (5,922.55 km) |
| Potomac to Crewe | 3,540.22 mi (5,697.44 km) |
| Potomac to Crigglestone | 3,566.14 mi (5,739.14 km) |
