| Alexandroupoli to Olympia Heights (Florida) | 5,846.87 mi (9,409.63 km) |
| Alexandroupoli to Omaha (Nebraska) | 5,699.35 mi (9,172.21 km) |
| Alexandroupoli to On Top of the World Designated Place (Florida) | 5,773.09 mi (9,290.90 km) |
| Alexandroupoli to Onalaska (Wisconsin) | 5,399.75 mi (8,690.06 km) |
| Alexandroupoli to Oneida (New York) | 4,860.62 mi (7,822.41 km) |
| Alexandroupoli to Oneonta (New York) | 4,863.29 mi (7,826.71 km) |
| Alexandroupoli to Ontario (California) | 6,764.71 mi (10,886.75 km) |
| Alexandroupoli to Ontario (Oregon) | 6,134.83 mi (9,873.06 km) |
| Alexandroupoli to Opa-locka (Florida) | 5,834.77 mi (9,390.16 km) |
| Alexandroupoli to Opelika (Alabama) | 5,733.23 mi (9,226.75 km) |
| Alexandroupoli to Opelousas (Louisiana) | 6,112.15 mi (9,836.55 km) |
| Alexandroupoli to Orange (California) | 6,784.82 mi (10,919.11 km) |
| Alexandroupoli to Orange (Texas) | 6,199.37 mi (9,976.92 km) |
| Alexandroupoli to Orange City (Florida) | 5,737.44 mi (9,233.52 km) |
| Alexandroupoli to Orangeburg (South Carolina) | 5,504.68 mi (8,858.93 km) |
