| Olbia to Cicero (Illinois) | 4,735.88 mi (7,621.66 km) |
| Olbia to Cimarron Hills (Colorado) | 5,543.21 mi (8,920.94 km) |
| Olbia to Cincinnati (Ohio) | 4,707.38 mi (7,575.79 km) |
| Olbia to Cinco Ranch (Texas) | 5,613.54 mi (9,034.12 km) |
| Olbia to Circleville (Ohio) | 4,620.24 mi (7,435.56 km) |
| Olbia to Citrus (California) | 6,268.05 mi (10,087.45 km) |
| Olbia to Citrus Heights (California) | 6,122.67 mi (9,853.48 km) |
| Olbia to Citrus Park (Florida) | 5,077.50 mi (8,171.45 km) |
| Olbia to Claiborne (Louisiana) | 5,327.66 mi (8,574.04 km) |
| Olbia to Claremont (California) | 6,261.52 mi (10,076.95 km) |
| Olbia to Claremont (New Hampshire) | 4,017.16 mi (6,465.00 km) |
| Olbia to Claremore (Oklahoma) | 5,303.07 mi (8,534.46 km) |
| Olbia to Clarksburg (Maryland) | 4,383.00 mi (7,053.76 km) |
| Olbia to Clarksburg (West Virginia) | 4,517.65 mi (7,270.45 km) |
| Olbia to Clarksdale (Mississippi) | 5,182.09 mi (8,339.76 km) |
