| Karlovac to Oignies | 673.97 mi (1,084.65 km) |
| Karlovac to Oissel | 725.25 mi (1,167.18 km) |
| Karlovac to Olivet | 666.69 mi (1,072.94 km) |
| Karlovac to Ollioules | 505.93 mi (814.22 km) |
| Karlovac to Olonne-sur-Mer | 832.77 mi (1,340.22 km) |
| Karlovac to Oloron-Sainte-Marie | 812.46 mi (1,307.52 km) |
| Karlovac to Onet Village | 637.81 mi (1,026.46 km) |
| Karlovac to Onnaing | 647.64 mi (1,042.27 km) |
| Karlovac to Orange | 534.18 mi (859.67 km) |
| Karlovac to Orchies | 664.25 mi (1,069.01 km) |
| Karlovac to Orleans | 666.74 mi (1,073.02 km) |
| Karlovac to Orly | 657.37 mi (1,057.94 km) |
| Karlovac to Ormesson-sur-Marne | 651.75 mi (1,048.89 km) |
| Karlovac to Orsay | 665.61 mi (1,071.20 km) |
| Karlovac to Orthez | 814.75 mi (1,311.21 km) |
