| Nea Smyrni to Olympia Heights (Florida) | 5,844.16 mi (9,405.27 km) |
| Nea Smyrni to Omaha (Nebraska) | 5,776.97 mi (9,297.13 km) |
| Nea Smyrni to On Top of the World Designated Place (Florida) | 5,785.26 mi (9,310.48 km) |
| Nea Smyrni to Onalaska (Wisconsin) | 5,474.37 mi (8,810.14 km) |
| Nea Smyrni to Oneida (New York) | 4,903.19 mi (7,890.92 km) |
| Nea Smyrni to Oneonta (New York) | 4,902.66 mi (7,890.07 km) |
| Nea Smyrni to Ontario (California) | 6,878.15 mi (11,069.31 km) |
| Nea Smyrni to Ontario (Oregon) | 6,263.19 mi (10,079.63 km) |
| Nea Smyrni to Opa-locka (Florida) | 5,832.40 mi (9,386.34 km) |
| Nea Smyrni to Opelika (Alabama) | 5,763.22 mi (9,275.01 km) |
| Nea Smyrni to Opelousas (Louisiana) | 6,152.13 mi (9,900.89 km) |
| Nea Smyrni to Orange (California) | 6,898.41 mi (11,101.92 km) |
| Nea Smyrni to Orange (Texas) | 6,242.45 mi (10,046.24 km) |
| Nea Smyrni to Orange City (Florida) | 5,746.74 mi (9,248.48 km) |
| Nea Smyrni to Orangeburg (South Carolina) | 5,526.94 mi (8,894.75 km) |
