| Karlovac to Olympia Heights (Florida) | 5,239.82 mi (8,432.67 km) |
| Karlovac to Omaha (Nebraska) | 5,110.48 mi (8,224.52 km) |
| Karlovac to On Top of the World Designated Place (Florida) | 5,163.55 mi (8,309.93 km) |
| Karlovac to Onalaska (Wisconsin) | 4,808.62 mi (7,738.73 km) |
| Karlovac to Oneida (New York) | 4,253.73 mi (6,845.71 km) |
| Karlovac to Oneonta (New York) | 4,255.59 mi (6,848.71 km) |
| Karlovac to Ontario (California) | 6,211.48 mi (9,996.41 km) |
| Karlovac to Ontario (Oregon) | 5,603.08 mi (9,017.28 km) |
| Karlovac to Opa-locka (Florida) | 5,227.64 mi (8,413.08 km) |
| Karlovac to Opelika (Alabama) | 5,124.08 mi (8,246.40 km) |
| Karlovac to Opelousas (Louisiana) | 5,504.99 mi (8,859.43 km) |
| Karlovac to Orange (California) | 6,231.78 mi (10,029.07 km) |
| Karlovac to Orange (Texas) | 5,593.08 mi (9,001.20 km) |
| Karlovac to Orange City (Florida) | 5,128.19 mi (8,253.02 km) |
| Karlovac to Orangeburg (South Carolina) | 4,894.88 mi (7,877.55 km) |
