| Potomac to Corato | 4,685.72 mi (7,540.94 km) |
| Potomac to Corbetta | 4,210.65 mi (6,776.39 km) |
| Potomac to Corciano | 4,434.32 mi (7,136.35 km) |
| Potomac to Cordenons | 4,354.16 mi (7,007.35 km) |
| Potomac to Cori | 4,514.57 mi (7,265.49 km) |
| Potomac to Coriano | 4,419.02 mi (7,111.73 km) |
| Potomac to Corigliano Calabro | 4,749.83 mi (7,644.11 km) |
| Potomac to Corleone | 4,672.37 mi (7,519.45 km) |
| Potomac to Cormano | 4,218.72 mi (6,789.37 km) |
| Potomac to Cornaredo | 4,214.60 mi (6,782.74 km) |
| Potomac to Cornate d'Adda | 4,228.36 mi (6,804.88 km) |
| Potomac to Cornedo Vicentino | 4,309.60 mi (6,935.63 km) |
| Potomac to Correggio | 4,313.54 mi (6,941.98 km) |
| Potomac to Corridonia | 4,483.68 mi (7,215.79 km) |
| Potomac to Corsico | 4,220.31 mi (6,791.94 km) |
