| Olbia to Carlsbad (New Mexico) | 5,845.29 mi (9,407.09 km) |
| Olbia to Carmel (Indiana) | 4,744.74 mi (7,635.92 km) |
| Olbia to Carmichael (California) | 6,127.42 mi (9,861.13 km) |
| Olbia to Carney (Maryland) | 4,342.79 mi (6,989.05 km) |
| Olbia to Carnot-Moon (Pennsylvania) | 4,465.97 mi (7,187.28 km) |
| Olbia to Carol Stream (Illinois) | 4,748.23 mi (7,641.54 km) |
| Olbia to Carolina (Puerto Rico) | 4,647.12 mi (7,478.81 km) |
| Olbia to Carolina Forest (South Carolina) | 4,669.22 mi (7,514.38 km) |
| Olbia to Carpentersville (Illinois) | 4,746.37 mi (7,638.55 km) |
| Olbia to Carpinteria (California) | 6,307.51 mi (10,150.95 km) |
| Olbia to Carrboro (North Carolina) | 4,592.02 mi (7,390.14 km) |
| Olbia to Carroll (Iowa) | 5,013.52 mi (8,068.48 km) |
| Olbia to Carrollton (Georgia) | 4,962.44 mi (7,986.27 km) |
| Olbia to Carrollton (Texas) | 5,511.35 mi (8,869.66 km) |
| Olbia to Carrollwood (Florida) | 5,075.85 mi (8,168.79 km) |
