| Potomac to Castrovillari | 4,727.52 mi (7,608.21 km) |
| Potomac to Catania | 4,766.24 mi (7,670.53 km) |
| Potomac to Catanzaro | 4,780.46 mi (7,693.41 km) |
| Potomac to Cattolica | 4,424.76 mi (7,120.96 km) |
| Potomac to Cava de' Tirreni | 4,627.96 mi (7,447.98 km) |
| Potomac to Cavallino | 4,796.07 mi (7,718.53 km) |
| Potomac to Cavarzere | 4,356.74 mi (7,011.50 km) |
| Potomac to Cave | 4,509.31 mi (7,257.03 km) |
| Potomac to Cavriago | 4,305.18 mi (6,928.51 km) |
| Potomac to Cavriglia | 4,386.25 mi (7,058.98 km) |
| Potomac to Cazzago San Martino | 4,254.44 mi (6,846.87 km) |
| Potomac to Ceccano | 4,535.92 mi (7,299.86 km) |
| Potomac to Cecina | 4,350.87 mi (7,002.05 km) |
| Potomac to Cefalu | 4,697.01 mi (7,559.10 km) |
| Potomac to Ceglie Messapico | 4,752.70 mi (7,648.72 km) |
