| Greenock to Mangualde | 1,068.95 mi (1,720.31 km) |
| Greenock to Marco de Canavezes | 1,031.64 mi (1,660.26 km) |
| Greenock to Marinha Grande | 1,135.36 mi (1,827.18 km) |
| Greenock to Massama | 1,205.91 mi (1,940.72 km) |
| Greenock to Matosinhos | 1,035.60 mi (1,666.63 km) |
| Greenock to Mealhada | 1,088.49 mi (1,751.75 km) |
| Greenock to Melgaco | 968.54 mi (1,558.72 km) |
| Greenock to Melres | 1,041.35 mi (1,675.88 km) |
| Greenock to Mira | 1,087.12 mi (1,749.55 km) |
| Greenock to Miranda do Corvo | 1,107.10 mi (1,781.71 km) |
| Greenock to Mirandela | 1,005.31 mi (1,617.89 km) |
| Greenock to Mogadouro | 1,013.74 mi (1,631.45 km) |
| Greenock to Moimenta da Beira | 1,042.32 mi (1,677.46 km) |
| Greenock to Moita | 1,210.98 mi (1,948.89 km) |
| Greenock to Moncao | 973.10 mi (1,566.05 km) |
