| Ermoupoli to Olympia Heights (Florida) | 5,918.85 mi (9,525.48 km) |
| Ermoupoli to Omaha (Nebraska) | 5,846.81 mi (9,409.54 km) |
| Ermoupoli to On Top of the World Designated Place (Florida) | 5,859.76 mi (9,430.37 km) |
| Ermoupoli to Onalaska (Wisconsin) | 5,544.52 mi (8,923.05 km) |
| Ermoupoli to Oneida (New York) | 4,976.22 mi (8,008.45 km) |
| Ermoupoli to Oneonta (New York) | 4,975.91 mi (8,007.95 km) |
| Ermoupoli to Ontario (California) | 6,942.71 mi (11,173.21 km) |
| Ermoupoli to Ontario (Oregon) | 6,324.58 mi (10,178.43 km) |
| Ermoupoli to Opa-locka (Florida) | 5,907.09 mi (9,506.54 km) |
| Ermoupoli to Opelika (Alabama) | 5,837.08 mi (9,393.87 km) |
| Ermoupoli to Opelousas (Louisiana) | 6,225.46 mi (10,018.91 km) |
| Ermoupoli to Orange (California) | 6,962.95 mi (11,205.78 km) |
| Ermoupoli to Orange (Texas) | 6,315.59 mi (10,163.95 km) |
| Ermoupoli to Orange City (Florida) | 5,821.29 mi (9,368.46 km) |
| Ermoupoli to Orangeburg (South Carolina) | 5,601.12 mi (9,014.12 km) |
