| Olbia to Colchester | 860.47 mi (1,384.79 km) |
| Olbia to Coleford | 945.20 mi (1,521.15 km) |
| Olbia to Colne | 1,044.59 mi (1,681.11 km) |
| Olbia to Colwyn Bay | 1,052.92 mi (1,694.50 km) |
| Olbia to Congleton | 1,007.21 mi (1,620.95 km) |
| Olbia to Conisbrough | 1,001.00 mi (1,610.95 km) |
| Olbia to Connahs Quay | 1,031.92 mi (1,660.72 km) |
| Olbia to Consett | 1,093.41 mi (1,759.68 km) |
| Olbia to Conwy | 1,055.93 mi (1,699.36 km) |
| Olbia to Cookstown | 1,205.84 mi (1,940.61 km) |
| Olbia to Corby | 932.20 mi (1,500.24 km) |
| Olbia to Corfe Mullen | 875.84 mi (1,409.53 km) |
| Olbia to Corsham | 914.49 mi (1,471.73 km) |
| Olbia to Coseley | 970.50 mi (1,561.86 km) |
| Olbia to Cosham | 851.78 mi (1,370.81 km) |
