| Portalegre to Menen | 943.22 mi (1,517.97 km) |
| Portalegre to Merchtem | 982.47 mi (1,581.12 km) |
| Portalegre to Merelbeke | 971.09 mi (1,562.81 km) |
| Portalegre to Merksem | 1,002.93 mi (1,614.07 km) |
| Portalegre to Merksplas | 1,021.27 mi (1,643.57 km) |
| Portalegre to Mettet | 960.80 mi (1,546.27 km) |
| Portalegre to Meulebeke | 956.06 mi (1,538.63 km) |
| Portalegre to Middelkerke | 957.27 mi (1,540.58 km) |
| Portalegre to Mol | 1,018.71 mi (1,639.46 km) |
| Portalegre to Mons | 947.10 mi (1,524.20 km) |
| Portalegre to Montignies-le-Tilleul | 956.05 mi (1,538.62 km) |
| Portalegre to Moorslede | 946.96 mi (1,523.98 km) |
| Portalegre to Moortebeek | 979.45 mi (1,576.28 km) |
| Portalegre to Morlanwelz-Mariemont | 955.18 mi (1,537.21 km) |
| Portalegre to Mortsel | 999.57 mi (1,608.66 km) |
