| Potomac to Cavaillon | 4,091.64 mi (6,584.86 km) |
| Potomac to Cebazat | 3,946.92 mi (6,351.96 km) |
| Potomac to Cenon | 3,812.17 mi (6,135.10 km) |
| Potomac to Cergy | 3,815.91 mi (6,141.12 km) |
| Potomac to Cernay | 4,064.71 mi (6,541.52 km) |
| Potomac to Cesson | 3,850.78 mi (6,197.23 km) |
| Potomac to Cesson-Sevigne | 3,681.91 mi (5,925.46 km) |
| Potomac to Cestas | 3,808.43 mi (6,129.08 km) |
| Potomac to Chalette-sur-Loing | 3,871.15 mi (6,230.02 km) |
| Potomac to Challans | 3,700.77 mi (5,955.82 km) |
| Potomac to Chalon-sur-Saone | 3,995.98 mi (6,430.91 km) |
| Potomac to Chalons-en-Champagne | 3,914.48 mi (6,299.74 km) |
| Potomac to Chamalieres | 3,947.11 mi (6,352.26 km) |
| Potomac to Chambery | 4,077.48 mi (6,562.08 km) |
| Potomac to Chambly | 3,820.36 mi (6,148.27 km) |
