| Hlohovec to Olympia Heights (Florida) | 5,258.59 mi (8,462.89 km) |
| Hlohovec to Omaha (Nebraska) | 5,046.49 mi (8,121.54 km) |
| Hlohovec to On Top of the World Designated Place (Florida) | 5,167.42 mi (8,316.16 km) |
| Hlohovec to Onalaska (Wisconsin) | 4,748.12 mi (7,641.37 km) |
| Hlohovec to Oneida (New York) | 4,228.76 mi (6,805.53 km) |
| Hlohovec to Oneonta (New York) | 4,234.07 mi (6,814.07 km) |
| Hlohovec to Ontario (California) | 6,110.45 mi (9,833.82 km) |
| Hlohovec to Ontario (Oregon) | 5,486.06 mi (8,828.95 km) |
| Hlohovec to Opa-locka (Florida) | 5,246.13 mi (8,442.84 km) |
| Hlohovec to Opelika (Alabama) | 5,109.73 mi (8,223.31 km) |
| Hlohovec to Opelousas (Louisiana) | 5,479.29 mi (8,818.07 km) |
| Hlohovec to Orange (California) | 6,130.60 mi (9,866.25 km) |
| Hlohovec to Orange (Texas) | 5,564.01 mi (8,954.41 km) |
| Hlohovec to Orange City (Florida) | 5,135.15 mi (8,264.23 km) |
| Hlohovec to Orangeburg (South Carolina) | 4,889.32 mi (7,868.61 km) |
