| Olbia to Castle Rock (Colorado) | 5,523.47 mi (8,889.16 km) |
| Olbia to Castro Valley (California) | 6,202.62 mi (9,982.16 km) |
| Olbia to Catalina Foothills (Arizona) | 6,111.59 mi (9,835.66 km) |
| Olbia to Cataño (Puerto Rico) | 4,654.34 mi (7,490.43 km) |
| Olbia to Cathedral City (California) | 6,233.94 mi (10,032.56 km) |
| Olbia to Catonsville (Maryland) | 4,357.86 mi (7,013.30 km) |
| Olbia to Cave Spring (Virginia) | 4,583.27 mi (7,376.07 km) |
| Olbia to Cayce (South Carolina) | 4,761.38 mi (7,662.70 km) |
| Olbia to Cayey (Puerto Rico) | 4,668.91 mi (7,513.89 km) |
| Olbia to Cedar City (Utah) | 5,908.46 mi (9,508.74 km) |
| Olbia to Cedar Falls (Iowa) | 4,898.40 mi (7,883.22 km) |
| Olbia to Cedar Hill (Texas) | 5,532.96 mi (8,904.43 km) |
| Olbia to Cedar Lake (Indiana) | 4,741.99 mi (7,631.50 km) |
| Olbia to Cedar Mill (Oregon) | 5,777.29 mi (9,297.65 km) |
| Olbia to Cedar Park (Texas) | 5,667.51 mi (9,120.98 km) |
