| Ospitaletto to Olympia Heights (Florida) | 4,990.04 mi (8,030.70 km) |
| Ospitaletto to Omaha (Nebraska) | 4,909.48 mi (7,901.04 km) |
| Ospitaletto to On Top of the World Designated Place (Florida) | 4,920.22 mi (7,918.33 km) |
| Ospitaletto to Onalaska (Wisconsin) | 4,605.63 mi (7,412.05 km) |
| Ospitaletto to Oneida (New York) | 4,027.40 mi (6,481.48 km) |
| Ospitaletto to Oneonta (New York) | 4,027.17 mi (6,481.11 km) |
| Ospitaletto to Ontario (California) | 6,040.36 mi (9,721.02 km) |
| Ospitaletto to Ontario (Oregon) | 5,450.25 mi (8,771.33 km) |
| Ospitaletto to Opa-locka (Florida) | 4,977.99 mi (8,011.30 km) |
| Ospitaletto to Opelika (Alabama) | 4,890.01 mi (7,869.72 km) |
| Ospitaletto to Opelousas (Louisiana) | 5,276.81 mi (8,492.20 km) |
| Ospitaletto to Orange (California) | 6,060.75 mi (9,753.83 km) |
| Ospitaletto to Orange (Texas) | 5,366.78 mi (8,637.00 km) |
| Ospitaletto to Orange City (Florida) | 4,883.50 mi (7,859.23 km) |
| Ospitaletto to Orangeburg (South Carolina) | 4,656.51 mi (7,493.93 km) |
