| North Potomac to Collegno | 4,163.44 mi (6,700.40 km) |
| North Potomac to Cologno al Serio | 4,238.91 mi (6,821.87 km) |
| North Potomac to Cologno Monzese | 4,222.65 mi (6,795.69 km) |
| North Potomac to Colorno | 4,289.47 mi (6,903.24 km) |
| North Potomac to Comacchio | 4,374.36 mi (7,039.85 km) |
| North Potomac to Comiso | 4,763.96 mi (7,666.85 km) |
| North Potomac to Como | 4,205.39 mi (6,767.92 km) |
| North Potomac to Concordia Sagittaria | 4,366.09 mi (7,026.55 km) |
| North Potomac to Concorezzo | 4,223.14 mi (6,796.49 km) |
| North Potomac to Conegliano | 4,338.84 mi (6,982.69 km) |
| North Potomac to Conselice | 4,365.66 mi (7,025.85 km) |
| North Potomac to Conselve | 4,342.74 mi (6,988.97 km) |
| North Potomac to Conversano | 4,722.45 mi (7,600.05 km) |
| North Potomac to Copertino | 4,790.07 mi (7,708.87 km) |
| North Potomac to Copparo | 4,352.61 mi (7,004.85 km) |
