| Alessandria to Olympia Heights (Florida) | 4,936.88 mi (7,945.14 km) |
| Alessandria to Omaha (Nebraska) | 4,883.43 mi (7,859.11 km) |
| Alessandria to On Top of the World Designated Place (Florida) | 4,871.53 mi (7,839.97 km) |
| Alessandria to Onalaska (Wisconsin) | 4,578.87 mi (7,368.98 km) |
| Alessandria to Oneida (New York) | 3,989.27 mi (6,420.12 km) |
| Alessandria to Oneonta (New York) | 3,987.89 mi (6,417.89 km) |
| Alessandria to Ontario (California) | 6,026.41 mi (9,698.57 km) |
| Alessandria to Ontario (Oregon) | 5,444.01 mi (8,761.29 km) |
| Alessandria to Opa-locka (Florida) | 4,924.92 mi (7,925.90 km) |
| Alessandria to Opelika (Alabama) | 4,847.02 mi (7,800.52 km) |
| Alessandria to Opelousas (Louisiana) | 5,236.93 mi (8,428.02 km) |
| Alessandria to Orange (California) | 6,046.82 mi (9,731.41 km) |
| Alessandria to Orange (Texas) | 5,327.88 mi (8,574.39 km) |
| Alessandria to Orange City (Florida) | 4,833.92 mi (7,779.44 km) |
| Alessandria to Orangeburg (South Carolina) | 4,611.06 mi (7,420.78 km) |
