| Opatija to Olympia Heights (Florida) | 5,187.52 mi (8,348.50 km) |
| Opatija to Omaha (Nebraska) | 5,073.21 mi (8,164.53 km) |
| Opatija to On Top of the World Designated Place (Florida) | 5,113.49 mi (8,229.36 km) |
| Opatija to Onalaska (Wisconsin) | 4,770.73 mi (7,677.74 km) |
| Opatija to Oneida (New York) | 4,208.94 mi (6,773.64 km) |
| Opatija to Oneonta (New York) | 4,210.17 mi (6,775.62 km) |
| Opatija to Ontario (California) | 6,182.66 mi (9,950.03 km) |
| Opatija to Ontario (Oregon) | 5,578.93 mi (8,978.42 km) |
| Opatija to Opa-locka (Florida) | 5,175.39 mi (8,328.98 km) |
| Opatija to Opelika (Alabama) | 5,077.03 mi (8,170.69 km) |
| Opatija to Opelousas (Louisiana) | 5,459.82 mi (8,786.74 km) |
| Opatija to Orange (California) | 6,202.99 mi (9,982.74 km) |
| Opatija to Orange (Texas) | 5,548.50 mi (8,929.45 km) |
| Opatija to Orange City (Florida) | 5,077.66 mi (8,171.71 km) |
| Opatija to Orangeburg (South Carolina) | 4,846.43 mi (7,799.58 km) |
