| Marcon to Octeville | 706.63 mi (1,137.22 km) |
| Marcon to Oignies | 547.33 mi (880.85 km) |
| Marcon to Oissel | 584.64 mi (940.89 km) |
| Marcon to Olivet | 517.39 mi (832.66 km) |
| Marcon to Ollioules | 359.69 mi (578.86 km) |
| Marcon to Olonne-sur-Mer | 677.35 mi (1,090.09 km) |
| Marcon to Oloron-Sainte-Marie | 657.11 mi (1,057.52 km) |
| Marcon to Onet Village | 481.26 mi (774.52 km) |
| Marcon to Onnaing | 522.42 mi (840.75 km) |
| Marcon to Orange | 379.56 mi (610.84 km) |
| Marcon to Orchies | 538.55 mi (866.71 km) |
| Marcon to Orleans | 517.67 mi (833.11 km) |
| Marcon to Orly | 514.51 mi (828.03 km) |
| Marcon to Ormesson-sur-Marne | 509.45 mi (819.89 km) |
| Marcon to Orsay | 522.09 mi (840.23 km) |
