| Bad Harzburg to Octeville | 555.02 mi (893.22 km) |
| Bad Harzburg to Oignies | 341.87 mi (550.19 km) |
| Bad Harzburg to Oissel | 450.36 mi (724.78 km) |
| Bad Harzburg to Olivet | 474.68 mi (763.92 km) |
| Bad Harzburg to Ollioules | 642.49 mi (1,033.98 km) |
| Bad Harzburg to Olonne-sur-Mer | 666.77 mi (1,073.07 km) |
| Bad Harzburg to Oloron-Sainte-Marie | 792.98 mi (1,276.17 km) |
| Bad Harzburg to Onet Village | 635.36 mi (1,022.51 km) |
| Bad Harzburg to Onnaing | 318.92 mi (513.26 km) |
| Bad Harzburg to Orange | 596.96 mi (960.72 km) |
| Bad Harzburg to Orchies | 331.37 mi (533.29 km) |
| Bad Harzburg to Orleans | 472.70 mi (760.74 km) |
| Bad Harzburg to Orly | 420.25 mi (676.33 km) |
| Bad Harzburg to Ormesson-sur-Marne | 413.14 mi (664.89 km) |
| Bad Harzburg to Orsay | 429.78 mi (691.66 km) |
