| Gretna to Collegno | 5,128.44 mi (8,253.43 km) |
| Gretna to Cologno al Serio | 5,204.15 mi (8,375.26 km) |
| Gretna to Cologno Monzese | 5,187.87 mi (8,349.08 km) |
| Gretna to Colorno | 5,254.68 mi (8,456.60 km) |
| Gretna to Comacchio | 5,339.59 mi (8,593.24 km) |
| Gretna to Comiso | 5,724.15 mi (9,212.12 km) |
| Gretna to Como | 5,170.62 mi (8,321.32 km) |
| Gretna to Concordia Sagittaria | 5,331.07 mi (8,579.53 km) |
| Gretna to Concorezzo | 5,188.37 mi (8,349.88 km) |
| Gretna to Conegliano | 5,303.85 mi (8,535.73 km) |
| Gretna to Conselice | 5,330.89 mi (8,579.23 km) |
| Gretna to Conselve | 5,307.94 mi (8,542.31 km) |
| Gretna to Conversano | 5,687.45 mi (9,153.06 km) |
| Gretna to Copertino | 5,754.99 mi (9,261.76 km) |
| Gretna to Copparo | 5,317.84 mi (8,558.24 km) |
