| Opovo to Montalegre | 1,425.93 mi (2,294.81 km) |
| Opovo to Montemor-o-Novo | 1,530.14 mi (2,462.52 km) |
| Opovo to Montemor-o-Velho | 1,509.71 mi (2,429.64 km) |
| Opovo to Montijo | 1,562.28 mi (2,514.25 km) |
| Opovo to Mortagua | 1,480.78 mi (2,383.09 km) |
| Opovo to Moura | 1,509.09 mi (2,428.65 km) |
| Opovo to Murtosa | 1,492.67 mi (2,402.22 km) |
| Opovo to Nazare | 1,543.80 mi (2,484.51 km) |
| Opovo to Nelas | 1,459.94 mi (2,349.55 km) |
| Opovo to Obidos | 1,555.05 mi (2,502.62 km) |
| Opovo to Odemira | 1,583.92 mi (2,549.07 km) |
| Opovo to Odivelas | 1,572.66 mi (2,530.95 km) |
| Opovo to Oeiras | 1,582.52 mi (2,546.81 km) |
| Opovo to Olhao | 1,564.43 mi (2,517.71 km) |
| Opovo to Oliveira de Azemeis | 1,482.29 mi (2,385.51 km) |
