| Potomac Park to Collegno | 5,953.11 mi (9,580.60 km) |
| Potomac Park to Cologno al Serio | 5,993.37 mi (9,645.40 km) |
| Potomac Park to Cologno Monzese | 5,983.22 mi (9,629.07 km) |
| Potomac Park to Colorno | 6,049.17 mi (9,735.20 km) |
| Potomac Park to Comacchio | 6,116.72 mi (9,843.91 km) |
| Potomac Park to Comiso | 6,619.87 mi (10,653.65 km) |
| Potomac Park to Como | 5,962.35 mi (9,595.47 km) |
| Potomac Park to Concordia Sagittaria | 6,078.22 mi (9,781.95 km) |
| Potomac Park to Concorezzo | 5,981.77 mi (9,626.73 km) |
| Potomac Park to Conegliano | 6,055.40 mi (9,745.22 km) |
| Potomac Park to Conselice | 6,116.10 mi (9,842.91 km) |
| Potomac Park to Conselve | 6,078.16 mi (9,781.85 km) |
| Potomac Park to Conversano | 6,472.37 mi (10,416.27 km) |
| Potomac Park to Copertino | 6,539.89 mi (10,524.93 km) |
| Potomac Park to Copparo | 6,095.27 mi (9,809.38 km) |