| Olen to Civita Castellana | 707.98 mi (1,139.38 km) |
| Olen to Civitanova Marche | 683.02 mi (1,099.21 km) |
| Olen to Civitavecchia | 706.18 mi (1,136.49 km) |
| Olen to Civitella in Val di Chiana | 623.14 mi (1,002.85 km) |
| Olen to Clusone | 432.08 mi (695.37 km) |
| Olen to Coccaglio | 451.89 mi (727.25 km) |
| Olen to Codigoro | 550.24 mi (885.53 km) |
| Olen to Codogno | 470.25 mi (756.79 km) |
| Olen to Codroipo | 515.83 mi (830.16 km) |
| Olen to Cogoleto | 499.10 mi (803.22 km) |
| Olen to Colle di Val d'Elsa | 610.61 mi (982.68 km) |
| Olen to Colle Salvetti | 584.05 mi (939.93 km) |
| Olen to Collecchio | 506.85 mi (815.69 km) |
| Olen to Colleferro | 756.90 mi (1,218.12 km) |
| Olen to Collegno | 437.88 mi (704.70 km) |
