| Olbia to Cloverly (Maryland) | 4,375.34 mi (7,041.43 km) |
| Olbia to Clovis (California) | 6,177.07 mi (9,941.03 km) |
| Olbia to Clovis (New Mexico) | 5,702.47 mi (9,177.24 km) |
| Olbia to Clute (Texas) | 5,630.69 mi (9,061.71 km) |
| Olbia to Coachella (California) | 6,230.59 mi (10,027.17 km) |
| Olbia to Coalinga (California) | 6,236.33 mi (10,036.41 km) |
| Olbia to Coamo (Puerto Rico) | 4,680.98 mi (7,533.31 km) |
| Olbia to Coatesville (Pennsylvania) | 4,289.89 mi (6,903.91 km) |
| Olbia to Cockeysville (Maryland) | 4,344.81 mi (6,992.30 km) |
| Olbia to Cocoa (Florida) | 4,977.99 mi (8,011.30 km) |
| Olbia to Cocoa Beach (Florida) | 4,973.29 mi (8,003.74 km) |
| Olbia to Coconut Creek (Florida) | 5,038.20 mi (8,108.20 km) |
| Olbia to Coeur d'Alene (Idaho) | 5,488.03 mi (8,832.13 km) |
| Olbia to Cohoes (New York) | 4,097.95 mi (6,595.02 km) |
| Olbia to Cold Springs (Nevada) | 6,025.84 mi (9,697.66 km) |
