| Kastav to Olympia Heights (Florida) | 5,188.66 mi (8,350.35 km) |
| Kastav to Omaha (Nebraska) | 5,073.00 mi (8,164.21 km) |
| Kastav to On Top of the World Designated Place (Florida) | 5,114.40 mi (8,230.83 km) |
| Kastav to Onalaska (Wisconsin) | 4,770.57 mi (7,677.49 km) |
| Kastav to Oneida (New York) | 4,209.35 mi (6,774.29 km) |
| Kastav to Oneonta (New York) | 4,210.63 mi (6,776.36 km) |
| Kastav to Ontario (California) | 6,181.86 mi (9,948.74 km) |
| Kastav to Ontario (Oregon) | 5,577.82 mi (8,976.63 km) |
| Kastav to Opa-locka (Florida) | 5,176.53 mi (8,330.82 km) |
| Kastav to Opelika (Alabama) | 5,077.65 mi (8,171.68 km) |
| Kastav to Opelousas (Louisiana) | 5,460.27 mi (8,787.46 km) |
| Kastav to Orange (California) | 6,202.18 mi (9,981.45 km) |
| Kastav to Orange (Texas) | 5,548.90 mi (8,930.09 km) |
| Kastav to Orange City (Florida) | 5,078.62 mi (8,173.25 km) |
| Kastav to Orangeburg (South Carolina) | 4,847.18 mi (7,800.78 km) |
