| Gelsenkirchen to Octeville | 404.97 mi (651.74 km) |
| Gelsenkirchen to Oignies | 192.66 mi (310.05 km) |
| Gelsenkirchen to Oissel | 304.04 mi (489.30 km) |
| Gelsenkirchen to Olivet | 342.92 mi (551.87 km) |
| Gelsenkirchen to Ollioules | 581.76 mi (936.25 km) |
| Gelsenkirchen to Olonne-sur-Mer | 528.51 mi (850.56 km) |
| Gelsenkirchen to Oloron-Sainte-Marie | 677.97 mi (1,091.08 km) |
| Gelsenkirchen to Onet Village | 536.06 mi (862.70 km) |
| Gelsenkirchen to Onnaing | 171.20 mi (275.52 km) |
| Gelsenkirchen to Orange | 520.68 mi (837.95 km) |
| Gelsenkirchen to Orchies | 182.45 mi (293.62 km) |
| Gelsenkirchen to Orleans | 340.64 mi (548.21 km) |
| Gelsenkirchen to Orly | 283.04 mi (455.51 km) |
| Gelsenkirchen to Ormesson-sur-Marne | 276.29 mi (444.65 km) |
| Gelsenkirchen to Orsay | 291.97 mi (469.88 km) |
