| Zalec to Olympia Heights (Florida) | 5,202.56 mi (8,372.71 km) |
| Zalec to Omaha (Nebraska) | 5,060.64 mi (8,144.32 km) |
| Zalec to On Top of the World Designated Place (Florida) | 5,123.61 mi (8,245.65 km) |
| Zalec to Onalaska (Wisconsin) | 4,759.15 mi (7,659.11 km) |
| Zalec to Oneida (New York) | 4,208.91 mi (6,773.59 km) |
| Zalec to Oneonta (New York) | 4,211.29 mi (6,777.42 km) |
| Zalec to Ontario (California) | 6,158.04 mi (9,910.40 km) |
| Zalec to Ontario (Oregon) | 5,548.38 mi (8,929.26 km) |
| Zalec to Opa-locka (Florida) | 5,190.32 mi (8,353.02 km) |
| Zalec to Opelika (Alabama) | 5,081.11 mi (8,177.26 km) |
| Zalec to Opelousas (Louisiana) | 5,460.37 mi (8,787.62 km) |
| Zalec to Orange (California) | 6,178.32 mi (9,943.05 km) |
| Zalec to Orange (Texas) | 5,547.98 mi (8,928.61 km) |
| Zalec to Orange City (Florida) | 5,088.78 mi (8,189.59 km) |
| Zalec to Orangeburg (South Carolina) | 4,853.28 mi (7,810.61 km) |
