| Olbia to Oswego (Illinois) | 4,766.44 mi (7,670.84 km) |
| Olbia to Oswego (New York) | 4,197.03 mi (6,754.47 km) |
| Olbia to Otsego (Minnesota) | 4,825.88 mi (7,766.51 km) |
| Olbia to Ottawa (Illinois) | 4,800.26 mi (7,725.28 km) |
| Olbia to Ottawa (Kansas) | 5,184.87 mi (8,344.24 km) |
| Olbia to Ottumwa (Iowa) | 4,961.81 mi (7,985.27 km) |
| Olbia to Overland (Missouri) | 4,977.30 mi (8,010.19 km) |
| Olbia to Overland Park (Kansas) | 5,148.36 mi (8,285.49 km) |
| Olbia to Overlea (Maryland) | 4,344.02 mi (6,991.03 km) |
| Olbia to Oviedo (Florida) | 4,986.63 mi (8,025.21 km) |
| Olbia to Owasso (Oklahoma) | 5,313.53 mi (8,551.30 km) |
| Olbia to Owatonna (Minnesota) | 4,861.38 mi (7,823.63 km) |
| Olbia to Owensboro (Kentucky) | 4,877.82 mi (7,850.09 km) |
| Olbia to Owings Mills (Maryland) | 4,354.66 mi (7,008.15 km) |
| Olbia to Owosso (Michigan) | 4,540.76 mi (7,307.64 km) |
