| Spring to Mangualde | 4,788.98 mi (7,707.11 km) |
| Spring to Marco de Canavezes | 4,755.04 mi (7,652.50 km) |
| Spring to Marinha Grande | 4,754.07 mi (7,650.94 km) |
| Spring to Massama | 4,763.08 mi (7,665.43 km) |
| Spring to Matosinhos | 4,728.50 mi (7,609.78 km) |
| Spring to Mealhada | 4,761.27 mi (7,662.52 km) |
| Spring to Melgaco | 4,725.49 mi (7,604.93 km) |
| Spring to Melres | 4,745.99 mi (7,637.93 km) |
| Spring to Mira | 4,746.16 mi (7,638.20 km) |
| Spring to Miranda do Corvo | 4,774.37 mi (7,683.60 km) |
| Spring to Mirandela | 4,793.65 mi (7,714.64 km) |
| Spring to Mogadouro | 4,819.93 mi (7,756.93 km) |
| Spring to Moimenta da Beira | 4,786.22 mi (7,702.68 km) |
| Spring to Moita | 4,780.42 mi (7,693.34 km) |
| Spring to Moncao | 4,716.42 mi (7,590.34 km) |
