| Louth to Mangualde | 953.22 mi (1,534.07 km) |
| Louth to Marco de Canavezes | 922.91 mi (1,485.28 km) |
| Louth to Marinha Grande | 1,030.13 mi (1,657.84 km) |
| Louth to Massama | 1,100.77 mi (1,771.52 km) |
| Louth to Matosinhos | 933.67 mi (1,502.59 km) |
| Louth to Mealhada | 980.12 mi (1,577.35 km) |
| Louth to Melgaco | 865.56 mi (1,392.98 km) |
| Louth to Melres | 935.20 mi (1,505.06 km) |
| Louth to Mira | 982.31 mi (1,580.88 km) |
| Louth to Miranda do Corvo | 996.27 mi (1,603.35 km) |
| Louth to Mirandela | 885.73 mi (1,425.45 km) |
| Louth to Mogadouro | 887.84 mi (1,428.84 km) |
| Louth to Moimenta da Beira | 926.20 mi (1,490.58 km) |
| Louth to Moita | 1,102.29 mi (1,773.96 km) |
| Louth to Moncao | 872.67 mi (1,404.42 km) |
