| Potomac to Celano | 4,527.04 mi (7,285.57 km) |
| Potomac to Cento | 4,336.29 mi (6,978.59 km) |
| Potomac to Cepagatti | 4,539.16 mi (7,305.07 km) |
| Potomac to Ceprano | 4,544.60 mi (7,313.83 km) |
| Potomac to Cercola | 4,606.33 mi (7,413.17 km) |
| Potomac to Cerea | 4,317.81 mi (6,948.85 km) |
| Potomac to Cerese | 4,302.86 mi (6,924.79 km) |
| Potomac to Cerignola | 4,659.53 mi (7,498.79 km) |
| Potomac to Cermenate | 4,210.35 mi (6,775.91 km) |
| Potomac to Cernusco sul Naviglio | 4,226.93 mi (6,802.59 km) |
| Potomac to Cerreto Guidi | 4,351.63 mi (7,003.27 km) |
| Potomac to Cerro Maggiore | 4,207.83 mi (6,771.85 km) |
| Potomac to Certaldo | 4,365.93 mi (7,026.29 km) |
| Potomac to Cerveteri | 4,466.05 mi (7,187.41 km) |
| Potomac to Cervia | 4,398.45 mi (7,078.62 km) |
