| Colonia to Cividale del Friuli | 4,193.27 mi (6,748.42 km) |
| Colonia to Civita Castellana | 4,281.55 mi (6,890.49 km) |
| Colonia to Civitanova Marche | 4,303.50 mi (6,925.81 km) |
| Colonia to Civitavecchia | 4,261.62 mi (6,858.42 km) |
| Colonia to Civitella in Val di Chiana | 4,212.10 mi (6,778.72 km) |
| Colonia to Clusone | 4,053.74 mi (6,523.86 km) |
| Colonia to Coccaglio | 4,065.29 mi (6,542.45 km) |
| Colonia to Codigoro | 4,180.82 mi (6,728.38 km) |
| Colonia to Codogno | 4,066.67 mi (6,544.68 km) |
| Colonia to Codroipo | 4,178.97 mi (6,725.40 km) |
| Colonia to Cogoleto | 4,045.82 mi (6,511.12 km) |
| Colonia to Colle di Val d'Elsa | 4,187.26 mi (6,738.75 km) |
| Colonia to Colle Salvetti | 4,152.10 mi (6,682.16 km) |
| Colonia to Collecchio | 4,102.13 mi (6,601.74 km) |
| Colonia to Colleferro | 4,328.30 mi (6,965.72 km) |
