| Gronau to Octeville | 417.99 mi (672.69 km) |
| Gronau to Oignies | 212.17 mi (341.45 km) |
| Gronau to Oissel | 326.82 mi (525.96 km) |
| Gronau to Olivet | 377.06 mi (606.82 km) |
| Gronau to Ollioules | 629.33 mi (1,012.80 km) |
| Gronau to Olonne-sur-Mer | 556.99 mi (896.39 km) |
| Gronau to Oloron-Sainte-Marie | 716.53 mi (1,153.15 km) |
| Gronau to Onet Village | 579.17 mi (932.09 km) |
| Gronau to Onnaing | 194.96 mi (313.76 km) |
| Gronau to Orange | 567.20 mi (912.82 km) |
| Gronau to Orchies | 203.13 mi (326.90 km) |
| Gronau to Orleans | 374.66 mi (602.96 km) |
| Gronau to Orly | 314.86 mi (506.71 km) |
| Gronau to Ormesson-sur-Marne | 308.47 mi (496.44 km) |
| Gronau to Orsay | 323.21 mi (520.16 km) |
