| Greenbelt to Collegno | 4,152.32 mi (6,682.52 km) |
| Greenbelt to Cologno al Serio | 4,228.18 mi (6,804.60 km) |
| Greenbelt to Cologno Monzese | 4,211.85 mi (6,778.32 km) |
| Greenbelt to Colorno | 4,278.63 mi (6,885.78 km) |
| Greenbelt to Comacchio | 4,363.65 mi (7,022.61 km) |
| Greenbelt to Comiso | 4,751.50 mi (7,646.80 km) |
| Greenbelt to Como | 4,194.66 mi (6,750.66 km) |
| Greenbelt to Concordia Sagittaria | 4,355.77 mi (7,009.93 km) |
| Greenbelt to Concorezzo | 4,212.38 mi (6,779.16 km) |
| Greenbelt to Conegliano | 4,328.49 mi (6,966.03 km) |
| Greenbelt to Conselice | 4,354.86 mi (7,008.47 km) |
| Greenbelt to Conselve | 4,332.15 mi (6,971.92 km) |
| Greenbelt to Conversano | 4,711.33 mi (7,582.15 km) |
| Greenbelt to Copertino | 4,778.89 mi (7,690.88 km) |
| Greenbelt to Copparo | 4,341.92 mi (6,987.65 km) |
