| Horn Lake to Mangualde | 4,342.42 mi (6,988.45 km) |
| Horn Lake to Marco de Canavezes | 4,307.65 mi (6,932.50 km) |
| Horn Lake to Marinha Grande | 4,309.92 mi (6,936.14 km) |
| Horn Lake to Massama | 4,321.26 mi (6,954.39 km) |
| Horn Lake to Matosinhos | 4,281.42 mi (6,890.29 km) |
| Horn Lake to Mealhada | 4,315.55 mi (6,945.21 km) |
| Horn Lake to Melgaco | 4,276.53 mi (6,882.41 km) |
| Horn Lake to Melres | 4,298.95 mi (6,918.50 km) |
| Horn Lake to Mira | 4,300.52 mi (6,921.02 km) |
| Horn Lake to Miranda do Corvo | 4,329.13 mi (6,967.05 km) |
| Horn Lake to Mirandela | 4,345.19 mi (6,992.91 km) |
| Horn Lake to Mogadouro | 4,371.48 mi (7,035.21 km) |
| Horn Lake to Moimenta da Beira | 4,338.89 mi (6,982.77 km) |
| Horn Lake to Moita | 4,338.62 mi (6,982.33 km) |
| Horn Lake to Moncao | 4,267.65 mi (6,868.11 km) |
