| Potomac to Cortona | 4,416.52 mi (7,107.71 km) |
| Potomac to Cosenza | 4,749.49 mi (7,643.56 km) |
| Potomac to Cossato | 4,175.22 mi (6,719.36 km) |
| Potomac to Costa Volpino | 4,249.49 mi (6,838.90 km) |
| Potomac to Creazzo | 4,318.03 mi (6,949.19 km) |
| Potomac to Crema | 4,246.77 mi (6,834.52 km) |
| Potomac to Cremona | 4,269.39 mi (6,870.92 km) |
| Potomac to Crevalcore | 4,331.13 mi (6,970.28 km) |
| Potomac to Crispiano | 4,742.99 mi (7,633.11 km) |
| Potomac to Crosia | 4,762.18 mi (7,663.98 km) |
| Potomac to Crotone | 4,796.36 mi (7,718.99 km) |
| Potomac to Cuneo | 4,185.80 mi (6,736.39 km) |
| Potomac to Cuorgne | 4,158.45 mi (6,692.38 km) |
| Potomac to Cusano Milanino | 4,219.43 mi (6,790.52 km) |
| Potomac to Cutro | 4,792.35 mi (7,712.55 km) |
