| Olbia to Centralia (Illinois) | 4,931.92 mi (7,937.16 km) |
| Olbia to Centralia (Washington) | 5,714.03 mi (9,195.84 km) |
| Olbia to Centreville (Virginia) | 4,405.18 mi (7,089.45 km) |
| Olbia to Ceres (California) | 6,174.74 mi (9,937.28 km) |
| Olbia to Cerritos (California) | 6,287.94 mi (10,119.45 km) |
| Olbia to Chalco (Nebraska) | 5,103.26 mi (8,212.91 km) |
| Olbia to Chalmette (Louisiana) | 5,343.39 mi (8,599.36 km) |
| Olbia to Chambersburg (Pennsylvania) | 4,374.33 mi (7,039.81 km) |
| Olbia to Chamblee (Georgia) | 4,913.99 mi (7,908.31 km) |
| Olbia to Champaign (Illinois) | 4,828.89 mi (7,771.35 km) |
| Olbia to Champlin (Minnesota) | 4,821.21 mi (7,758.99 km) |
| Olbia to Chandler (Arizona) | 6,096.65 mi (9,811.61 km) |
| Olbia to Chanhassen (Minnesota) | 4,841.33 mi (7,791.36 km) |
| Olbia to Channahon (Illinois) | 4,774.07 mi (7,683.12 km) |
| Olbia to Channelview (Texas) | 5,582.47 mi (8,984.12 km) |
