| Montemor-o-Novo to Octeville | 824.72 mi (1,327.26 km) |
| Montemor-o-Novo to Oignies | 983.23 mi (1,582.36 km) |
| Montemor-o-Novo to Oissel | 870.17 mi (1,400.40 km) |
| Montemor-o-Novo to Olivet | 813.70 mi (1,309.52 km) |
| Montemor-o-Novo to Ollioules | 796.04 mi (1,281.10 km) |
| Montemor-o-Novo to Olonne-sur-Mer | 635.35 mi (1,022.50 km) |
| Montemor-o-Novo to Oloron-Sainte-Marie | 506.02 mi (814.36 km) |
| Montemor-o-Novo to Onet Village | 683.77 mi (1,100.42 km) |
| Montemor-o-Novo to Onnaing | 995.64 mi (1,602.32 km) |
| Montemor-o-Novo to Orange | 773.08 mi (1,244.15 km) |
| Montemor-o-Novo to Orchies | 990.39 mi (1,593.88 km) |
| Montemor-o-Novo to Orleans | 815.94 mi (1,313.12 km) |
| Montemor-o-Novo to Orly | 874.18 mi (1,406.85 km) |
| Montemor-o-Novo to Ormesson-sur-Marne | 880.72 mi (1,417.38 km) |
| Montemor-o-Novo to Orsay | 865.67 mi (1,393.16 km) |
