| Greenfield to Mangualde | 3,971.00 mi (6,390.71 km) |
| Greenfield to Marco de Canavezes | 3,933.00 mi (6,329.56 km) |
| Greenfield to Marinha Grande | 3,948.64 mi (6,354.73 km) |
| Greenfield to Massama | 3,968.82 mi (6,387.20 km) |
| Greenfield to Matosinhos | 3,908.39 mi (6,289.94 km) |
| Greenfield to Mealhada | 3,947.90 mi (6,353.54 km) |
| Greenfield to Melgaco | 3,895.14 mi (6,268.63 km) |
| Greenfield to Melres | 3,925.93 mi (6,318.17 km) |
| Greenfield to Mira | 3,933.35 mi (6,330.11 km) |
| Greenfield to Miranda do Corvo | 3,963.29 mi (6,378.31 km) |
| Greenfield to Mirandela | 3,965.44 mi (6,381.76 km) |
| Greenfield to Mogadouro | 3,991.50 mi (6,423.70 km) |
| Greenfield to Moimenta da Beira | 3,964.20 mi (6,379.76 km) |
| Greenfield to Moita | 3,986.07 mi (6,414.96 km) |
| Greenfield to Moncao | 3,887.19 mi (6,255.82 km) |
