| Giessen to Octeville | 461.25 mi (742.31 km) |
| Giessen to Oignies | 249.25 mi (401.13 km) |
| Giessen to Oissel | 347.28 mi (558.89 km) |
| Giessen to Olivet | 358.30 mi (576.62 km) |
| Giessen to Ollioules | 531.19 mi (854.87 km) |
| Giessen to Olonne-sur-Mer | 552.52 mi (889.19 km) |
| Giessen to Oloron-Sainte-Marie | 671.56 mi (1,080.77 km) |
| Giessen to Onet Village | 514.39 mi (827.83 km) |
| Giessen to Onnaing | 223.19 mi (359.19 km) |
| Giessen to Orange | 480.33 mi (773.02 km) |
| Giessen to Orchies | 238.23 mi (383.40 km) |
| Giessen to Orleans | 356.48 mi (573.70 km) |
| Giessen to Orly | 307.89 mi (495.51 km) |
| Giessen to Ormesson-sur-Marne | 300.67 mi (483.89 km) |
| Giessen to Orsay | 317.68 mi (511.25 km) |
