| Groves to Mangualde | 4,722.29 mi (7,599.79 km) |
| Groves to Marco de Canavezes | 4,688.82 mi (7,545.92 km) |
| Groves to Marinha Grande | 4,686.18 mi (7,541.68 km) |
| Groves to Massama | 4,694.12 mi (7,554.46 km) |
| Groves to Matosinhos | 4,662.11 mi (7,502.94 km) |
| Groves to Mealhada | 4,694.15 mi (7,554.51 km) |
| Groves to Melgaco | 4,660.19 mi (7,499.84 km) |
| Groves to Melres | 4,679.57 mi (7,531.04 km) |
| Groves to Mira | 4,679.00 mi (7,530.13 km) |
| Groves to Miranda do Corvo | 4,707.00 mi (7,575.19 km) |
| Groves to Mirandela | 4,728.03 mi (7,609.03 km) |
| Groves to Mogadouro | 4,754.30 mi (7,651.31 km) |
| Groves to Moimenta da Beira | 4,719.95 mi (7,596.03 km) |
| Groves to Moita | 4,711.45 mi (7,582.35 km) |
| Groves to Moncao | 4,651.01 mi (7,485.07 km) |
