| Olbia to Chickasha (Oklahoma) | 5,459.41 mi (8,786.08 km) |
| Olbia to Chico (California) | 6,078.44 mi (9,782.31 km) |
| Olbia to Chicopee (Massachusetts) | 4,067.47 mi (6,545.96 km) |
| Olbia to Chillicothe (Ohio) | 4,633.44 mi (7,456.80 km) |
| Olbia to Chillum (Maryland) | 4,379.60 mi (7,048.29 km) |
| Olbia to Chino (California) | 6,267.65 mi (10,086.82 km) |
| Olbia to Chino Hills (California) | 6,271.53 mi (10,093.06 km) |
| Olbia to Chino Valley (Arizona) | 6,039.24 mi (9,719.22 km) |
| Olbia to Chippewa Falls (Wisconsin) | 4,753.96 mi (7,650.76 km) |
| Olbia to Choctaw (Oklahoma) | 5,410.59 mi (8,707.51 km) |
| Olbia to Chowchilla (California) | 6,179.04 mi (9,944.20 km) |
| Olbia to Christiansburg (Virginia) | 4,604.57 mi (7,410.35 km) |
| Olbia to Chubbuck (Idaho) | 5,609.68 mi (9,027.90 km) |
| Olbia to Chula Vista (California) | 6,319.50 mi (10,170.25 km) |
| Olbia to Cibolo (Texas) | 5,729.49 mi (9,220.72 km) |
