| Tortona to Olympia Heights (Florida) | 4,948.93 mi (7,964.54 km) |
| Tortona to Omaha (Nebraska) | 4,893.79 mi (7,875.80 km) |
| Tortona to On Top of the World Designated Place (Florida) | 4,883.40 mi (7,859.07 km) |
| Tortona to Onalaska (Wisconsin) | 4,589.29 mi (7,385.75 km) |
| Tortona to Oneida (New York) | 4,000.53 mi (6,438.23 km) |
| Tortona to Oneonta (New York) | 3,999.22 mi (6,436.13 km) |
| Tortona to Ontario (California) | 6,035.70 mi (9,713.53 km) |
| Tortona to Ontario (Oregon) | 5,452.51 mi (8,774.97 km) |
| Tortona to Opa-locka (Florida) | 4,936.97 mi (7,945.29 km) |
| Tortona to Opelika (Alabama) | 4,858.59 mi (7,819.14 km) |
| Tortona to Opelousas (Louisiana) | 5,248.31 mi (8,446.34 km) |
| Tortona to Orange (California) | 6,056.11 mi (9,746.37 km) |
| Tortona to Orange (Texas) | 5,339.21 mi (8,592.62 km) |
| Tortona to Orange City (Florida) | 4,845.83 mi (7,798.60 km) |
| Tortona to Orangeburg (South Carolina) | 4,622.76 mi (7,439.62 km) |
