| Olbia to Chantilly (Virginia) | 4,403.68 mi (7,087.04 km) |
| Olbia to Chaparral (New Mexico) | 5,950.34 mi (9,576.15 km) |
| Olbia to Chapel Hill (North Carolina) | 4,589.72 mi (7,386.45 km) |
| Olbia to Charleston (Illinois) | 4,851.16 mi (7,807.19 km) |
| Olbia to Charleston (South Carolina) | 4,756.92 mi (7,655.52 km) |
| Olbia to Charleston (West Virginia) | 4,612.36 mi (7,422.88 km) |
| Olbia to Charlotte (North Carolina) | 4,700.68 mi (7,565.02 km) |
| Olbia to Charlottesville (Virginia) | 4,482.87 mi (7,214.48 km) |
| Olbia to Chaska (Minnesota) | 4,844.77 mi (7,796.91 km) |
| Olbia to Chatham (Illinois) | 4,907.13 mi (7,897.27 km) |
| Olbia to Chattanooga (Tennessee) | 4,907.62 mi (7,898.05 km) |
| Olbia to Cheat Lake (West Virginia) | 4,482.35 mi (7,213.65 km) |
| Olbia to Chelsea (Alabama) | 5,043.63 mi (8,116.94 km) |
| Olbia to Chelsea (Massachusetts) | 3,991.14 mi (6,423.11 km) |
| Olbia to Cheney (Washington) | 5,522.21 mi (8,887.15 km) |
