| Seabrook to Mangualde | 3,570.73 mi (5,746.54 km) |
| Seabrook to Marco de Canavezes | 3,536.94 mi (5,692.15 km) |
| Seabrook to Marinha Grande | 3,535.90 mi (5,690.48 km) |
| Seabrook to Massama | 3,545.51 mi (5,705.95 km) |
| Seabrook to Matosinhos | 3,510.33 mi (5,649.34 km) |
| Seabrook to Mealhada | 3,542.98 mi (5,701.87 km) |
| Seabrook to Melgaco | 3,507.92 mi (5,645.46 km) |
| Seabrook to Melres | 3,527.81 mi (5,677.47 km) |
| Seabrook to Mira | 3,527.86 mi (5,677.55 km) |
| Seabrook to Miranda do Corvo | 3,556.08 mi (5,722.96 km) |
| Seabrook to Mirandela | 3,575.86 mi (5,754.80 km) |
| Seabrook to Mogadouro | 3,602.14 mi (5,797.09 km) |
| Seabrook to Moimenta da Beira | 3,568.10 mi (5,742.31 km) |
| Seabrook to Moita | 3,562.86 mi (5,733.88 km) |
| Seabrook to Moncao | 3,498.77 mi (5,630.73 km) |
