| Olbia to Cividale del Friuli | 408.66 mi (657.67 km) |
| Olbia to Civita Castellana | 177.99 mi (286.44 km) |
| Olbia to Civitanova Marche | 272.34 mi (438.29 km) |
| Olbia to Civitavecchia | 144.37 mi (232.35 km) |
| Olbia to Civitella in Val di Chiana | 206.68 mi (332.62 km) |
| Olbia to Clusone | 343.90 mi (553.45 km) |
| Olbia to Coccaglio | 321.95 mi (518.13 km) |
| Olbia to Codigoro | 301.26 mi (484.84 km) |
| Olbia to Codogno | 293.37 mi (472.13 km) |
| Olbia to Codroipo | 389.79 mi (627.30 km) |
| Olbia to Cogoleto | 243.83 mi (392.40 km) |
| Olbia to Colle di Val d'Elsa | 190.88 mi (307.19 km) |
| Olbia to Colle Salvetti | 192.09 mi (309.14 km) |
| Olbia to Collecchio | 267.33 mi (430.23 km) |
| Olbia to Colleferro | 190.98 mi (307.35 km) |
