| Aosta to Olympia Heights (Florida) | 4,859.61 mi (7,820.78 km) |
| Aosta to Omaha (Nebraska) | 4,798.83 mi (7,722.98 km) |
| Aosta to On Top of the World Designated Place (Florida) | 4,792.08 mi (7,712.11 km) |
| Aosta to Onalaska (Wisconsin) | 4,494.31 mi (7,232.90 km) |
| Aosta to Oneida (New York) | 3,906.31 mi (6,286.61 km) |
| Aosta to Oneonta (New York) | 3,905.21 mi (6,284.82 km) |
| Aosta to Ontario (California) | 5,942.15 mi (9,562.97 km) |
| Aosta to Ontario (Oregon) | 5,360.94 mi (8,627.60 km) |
| Aosta to Opa-locka (Florida) | 4,847.60 mi (7,801.45 km) |
| Aosta to Opelika (Alabama) | 4,765.43 mi (7,669.22 km) |
| Aosta to Opelousas (Louisiana) | 5,154.45 mi (8,295.28 km) |
| Aosta to Orange (California) | 5,962.56 mi (9,595.82 km) |
| Aosta to Orange (Texas) | 5,245.16 mi (8,441.26 km) |
| Aosta to Orange City (Florida) | 4,754.86 mi (7,652.21 km) |
| Aosta to Orangeburg (South Carolina) | 4,530.30 mi (7,290.82 km) |
