| Opatija to Oswego (Illinois) | 4,768.56 mi (7,674.25 km) |
| Opatija to Oswego (New York) | 4,227.41 mi (6,803.36 km) |
| Opatija to Otsego (Minnesota) | 4,790.20 mi (7,709.09 km) |
| Opatija to Ottawa (Illinois) | 4,802.51 mi (7,728.89 km) |
| Opatija to Ottawa (Kansas) | 5,178.24 mi (8,333.56 km) |
| Opatija to Ottumwa (Iowa) | 4,953.13 mi (7,971.29 km) |
| Opatija to Overland (Missouri) | 4,988.49 mi (8,028.19 km) |
| Opatija to Overland Park (Kansas) | 5,142.45 mi (8,275.97 km) |
| Opatija to Overlea (Maryland) | 4,400.11 mi (7,081.29 km) |
| Opatija to Oviedo (Florida) | 5,086.28 mi (8,185.58 km) |
| Opatija to Owasso (Oklahoma) | 5,316.32 mi (8,555.79 km) |
| Opatija to Owatonna (Minnesota) | 4,833.37 mi (7,778.56 km) |
| Opatija to Owensboro (Kentucky) | 4,906.04 mi (7,895.51 km) |
| Opatija to Owings Mills (Maryland) | 4,409.54 mi (7,096.47 km) |
| Opatija to Owosso (Michigan) | 4,549.41 mi (7,321.56 km) |
