| Oppeano to Montemor-o-Novo | 1,093.64 mi (1,760.05 km) |
| Oppeano to Montemor-o-Velho | 1,065.46 mi (1,714.69 km) |
| Oppeano to Montijo | 1,124.15 mi (1,809.14 km) |
| Oppeano to Mortagua | 1,036.11 mi (1,667.46 km) |
| Oppeano to Moura | 1,077.51 mi (1,734.08 km) |
| Oppeano to Murtosa | 1,046.50 mi (1,684.18 km) |
| Oppeano to Nazare | 1,101.25 mi (1,772.28 km) |
| Oppeano to Nelas | 1,015.43 mi (1,634.18 km) |
| Oppeano to Obidos | 1,113.36 mi (1,791.78 km) |
| Oppeano to Odemira | 1,152.30 mi (1,854.45 km) |
| Oppeano to Odivelas | 1,133.46 mi (1,824.13 km) |
| Oppeano to Oeiras | 1,143.55 mi (1,840.37 km) |
| Oppeano to Olhao | 1,138.66 mi (1,832.49 km) |
| Oppeano to Oliveira de Azemeis | 1,035.94 mi (1,667.18 km) |
| Oppeano to Oliveira de Frades | 1,025.49 mi (1,650.37 km) |
