| Unna to Octeville | 429.77 mi (691.65 km) |
| Unna to Oignies | 216.97 mi (349.18 km) |
| Unna to Oissel | 327.32 mi (526.76 km) |
| Unna to Olivet | 362.06 mi (582.68 km) |
| Unna to Ollioules | 586.38 mi (943.69 km) |
| Unna to Olonne-sur-Mer | 549.68 mi (884.63 km) |
| Unna to Oloron-Sainte-Marie | 693.87 mi (1,116.68 km) |
| Unna to Onet Village | 548.27 mi (882.35 km) |
| Unna to Onnaing | 194.83 mi (313.55 km) |
| Unna to Orange | 528.09 mi (849.88 km) |
| Unna to Orchies | 206.62 mi (332.52 km) |
| Unna to Orleans | 359.86 mi (579.14 km) |
| Unna to Orly | 303.49 mi (488.42 km) |
| Unna to Ormesson-sur-Marne | 296.61 mi (477.35 km) |
| Unna to Orsay | 312.62 mi (503.11 km) |
