| Olbia to Caño Martin Peña (Puerto Rico) | 4,649.76 mi (7,483.07 km) |
| Olbia to Cañon City (Colorado) | 5,583.44 mi (8,985.68 km) |
| Olbia to Canóvanas (Puerto Rico) | 4,644.56 mi (7,474.71 km) |
| Olbia to Canton (Georgia) | 4,907.49 mi (7,897.84 km) |
| Olbia to Canton (Illinois) | 4,883.87 mi (7,859.83 km) |
| Olbia to Canton (Mississippi) | 5,228.61 mi (8,414.63 km) |
| Olbia to Canton (Ohio) | 4,505.23 mi (7,250.47 km) |
| Olbia to Canyon (Texas) | 5,624.29 mi (9,051.42 km) |
| Olbia to Canyon Lake (California) | 6,269.93 mi (10,090.48 km) |
| Olbia to Canyon Lake (Texas) | 5,716.77 mi (9,200.26 km) |
| Olbia to Cape Coral (Florida) | 5,111.05 mi (8,225.44 km) |
| Olbia to Cape Girardeau (Missouri) | 5,002.40 mi (8,050.59 km) |
| Olbia to Carbondale (Illinois) | 4,970.33 mi (7,998.98 km) |
| Olbia to Carlisle (Pennsylvania) | 4,344.21 mi (6,991.33 km) |
| Olbia to Carlsbad (California) | 6,301.69 mi (10,141.58 km) |
