| Clausthal-Zellerfeld to Octeville | 544.50 mi (876.29 km) |
| Clausthal-Zellerfeld to Oignies | 331.24 mi (533.09 km) |
| Clausthal-Zellerfeld to Oissel | 439.49 mi (707.30 km) |
| Clausthal-Zellerfeld to Olivet | 463.70 mi (746.25 km) |
| Clausthal-Zellerfeld to Ollioules | 634.06 mi (1,020.43 km) |
| Clausthal-Zellerfeld to Olonne-sur-Mer | 655.76 mi (1,055.35 km) |
| Clausthal-Zellerfeld to Oloron-Sainte-Marie | 782.42 mi (1,259.18 km) |
| Clausthal-Zellerfeld to Onet Village | 625.26 mi (1,006.25 km) |
| Clausthal-Zellerfeld to Onnaing | 308.18 mi (495.96 km) |
| Clausthal-Zellerfeld to Orange | 587.75 mi (945.90 km) |
| Clausthal-Zellerfeld to Orchies | 320.71 mi (516.14 km) |
| Clausthal-Zellerfeld to Orleans | 461.72 mi (743.06 km) |
| Clausthal-Zellerfeld to Orly | 409.24 mi (658.61 km) |
| Clausthal-Zellerfeld to Ormesson-sur-Marne | 402.13 mi (647.17 km) |
| Clausthal-Zellerfeld to Orsay | 418.77 mi (673.94 km) |
