| Cayce to Mangualde | 3,938.46 mi (6,338.34 km) |
| Cayce to Marco de Canavezes | 3,906.56 mi (6,287.00 km) |
| Cayce to Marinha Grande | 3,898.72 mi (6,274.38 km) |
| Cayce to Massama | 3,903.63 mi (6,282.29 km) |
| Cayce to Matosinhos | 3,879.35 mi (6,243.22 km) |
| Cayce to Mealhada | 3,909.02 mi (6,290.95 km) |
| Cayce to Melgaco | 3,881.10 mi (6,246.03 km) |
| Cayce to Melres | 3,896.69 mi (6,271.12 km) |
| Cayce to Mira | 3,893.78 mi (6,266.44 km) |
| Cayce to Miranda do Corvo | 3,921.09 mi (6,310.39 km) |
| Cayce to Mirandela | 3,947.71 mi (6,353.23 km) |
| Cayce to Mogadouro | 3,973.90 mi (6,395.37 km) |
| Cayce to Moimenta da Beira | 3,937.50 mi (6,336.79 km) |
| Cayce to Moita | 3,920.90 mi (6,310.08 km) |
| Cayce to Moncao | 3,871.57 mi (6,230.68 km) |
