| Isabela to Mangualde | 3,795.61 mi (6,108.44 km) |
| Isabela to Marco de Canavezes | 3,779.28 mi (6,082.16 km) |
| Isabela to Marinha Grande | 3,728.51 mi (6,000.46 km) |
| Isabela to Massama | 3,704.11 mi (5,961.18 km) |
| Isabela to Matosinhos | 3,750.84 mi (6,036.39 km) |
| Isabela to Mealhada | 3,758.14 mi (6,048.14 km) |
| Isabela to Melgaco | 3,780.34 mi (6,083.87 km) |
| Isabela to Melres | 3,765.50 mi (6,059.98 km) |
| Isabela to Mira | 3,743.65 mi (6,024.82 km) |
| Isabela to Miranda do Corvo | 3,762.42 mi (6,055.03 km) |
| Isabela to Mirandela | 3,831.33 mi (6,165.92 km) |
| Isabela to Mogadouro | 3,854.37 mi (6,203.01 km) |
| Isabela to Moimenta da Beira | 3,805.69 mi (6,124.67 km) |
| Isabela to Moita | 3,719.15 mi (5,985.39 km) |
| Isabela to Moncao | 3,769.13 mi (6,065.83 km) |
