| Potomac to Cehegin | 3,948.15 mi (6,353.93 km) |
| Potomac to Cervello | 4,025.88 mi (6,479.02 km) |
| Potomac to Cervera | 3,985.74 mi (6,414.42 km) |
| Potomac to Ceuti | 3,974.18 mi (6,395.83 km) |
| Potomac to Cheste | 3,959.48 mi (6,372.17 km) |
| Potomac to Chiclana de la Frontera | 3,784.44 mi (6,090.46 km) |
| Potomac to Chipiona | 3,760.78 mi (6,052.38 km) |
| Potomac to Chiva | 3,958.04 mi (6,369.86 km) |
| Potomac to Churriana de la Vega | 3,886.37 mi (6,254.50 km) |
| Potomac to Ciempozuelos | 3,798.67 mi (6,113.37 km) |
| Potomac to Cieza | 3,962.09 mi (6,376.37 km) |
| Potomac to Cisterniga | 3,707.16 mi (5,966.09 km) |
| Potomac to Ciudad de Melilla | 3,979.85 mi (6,404.94 km) |
| Potomac to Ciudad Real | 3,818.32 mi (6,144.99 km) |
| Potomac to Ciudad-Rodrigo | 3,645.76 mi (5,867.28 km) |
