| Grimsby to Mangualde | 964.48 mi (1,552.18 km) |
| Grimsby to Marco de Canavezes | 933.85 mi (1,502.89 km) |
| Grimsby to Marinha Grande | 1,041.05 mi (1,675.40 km) |
| Grimsby to Massama | 1,111.75 mi (1,789.18 km) |
| Grimsby to Matosinhos | 944.34 mi (1,519.77 km) |
| Grimsby to Mealhada | 991.11 mi (1,595.04 km) |
| Grimsby to Melgaco | 876.19 mi (1,410.09 km) |
| Grimsby to Melres | 946.05 mi (1,522.52 km) |
| Grimsby to Mira | 993.16 mi (1,598.34 km) |
| Grimsby to Miranda do Corvo | 1,007.38 mi (1,621.21 km) |
| Grimsby to Mirandela | 897.06 mi (1,443.69 km) |
| Grimsby to Mogadouro | 899.42 mi (1,447.48 km) |
| Grimsby to Moimenta da Beira | 937.44 mi (1,508.67 km) |
| Grimsby to Moita | 1,113.40 mi (1,791.85 km) |
| Grimsby to Moncao | 883.21 mi (1,421.38 km) |
