| Hunedoara to Olympia Heights (Florida) | 5,554.67 mi (8,939.38 km) |
| Hunedoara to Omaha (Nebraska) | 5,346.06 mi (8,603.65 km) |
| Hunedoara to On Top of the World Designated Place (Florida) | 5,466.96 mi (8,798.23 km) |
| Hunedoara to Onalaska (Wisconsin) | 5,048.46 mi (8,124.70 km) |
| Hunedoara to Oneida (New York) | 4,531.47 mi (7,292.69 km) |
| Hunedoara to Oneonta (New York) | 4,536.60 mi (7,300.96 km) |
| Hunedoara to Ontario (California) | 6,396.98 mi (10,294.94 km) |
| Hunedoara to Ontario (Oregon) | 5,764.69 mi (9,277.37 km) |
| Hunedoara to Opa-locka (Florida) | 5,542.29 mi (8,919.45 km) |
| Hunedoara to Opelika (Alabama) | 5,411.84 mi (8,709.52 km) |
| Hunedoara to Opelousas (Louisiana) | 5,782.10 mi (9,305.39 km) |
| Hunedoara to Orange (California) | 6,417.04 mi (10,327.22 km) |
| Hunedoara to Orange (Texas) | 5,866.86 mi (9,441.80 km) |
| Hunedoara to Orange City (Florida) | 5,434.06 mi (8,745.28 km) |
| Hunedoara to Orangeburg (South Carolina) | 5,190.37 mi (8,353.10 km) |
