| Potomac to Cabestany | 4,032.22 mi (6,489.23 km) |
| Potomac to Cabries | 4,119.16 mi (6,629.15 km) |
| Potomac to Cachan | 3,833.52 mi (6,169.45 km) |
| Potomac to Caen | 3,709.57 mi (5,969.97 km) |
| Potomac to Cagnes-sur-Mer | 4,190.98 mi (6,744.74 km) |
| Potomac to Cahors | 3,912.36 mi (6,296.34 km) |
| Potomac to Calais | 3,760.04 mi (6,051.19 km) |
| Potomac to Caluire-et-Cuire | 4,024.40 mi (6,476.65 km) |
| Potomac to Cambrai | 3,835.63 mi (6,172.85 km) |
| Potomac to Canet-en-Roussillon | 4,034.40 mi (6,492.75 km) |
| Potomac to Cannes | 4,188.55 mi (6,740.82 km) |
| Potomac to Canteleu | 3,762.35 mi (6,054.92 km) |
| Potomac to Capbreton | 3,804.13 mi (6,122.15 km) |
| Potomac to Carcassonne | 3,989.36 mi (6,420.25 km) |
| Potomac to Carmaux | 3,956.09 mi (6,366.71 km) |
