| Greer to Mangualde | 3,963.35 mi (6,378.39 km) |
| Greer to Marco de Canavezes | 3,930.57 mi (6,325.64 km) |
| Greer to Marinha Grande | 3,925.73 mi (6,317.86 km) |
| Greer to Massama | 3,932.61 mi (6,328.93 km) |
| Greer to Matosinhos | 3,903.63 mi (6,282.28 km) |
| Greer to Mealhada | 3,934.64 mi (6,332.19 km) |
| Greer to Melgaco | 3,903.44 mi (6,281.98 km) |
| Greer to Melres | 3,921.04 mi (6,310.30 km) |
| Greer to Mira | 3,919.45 mi (6,307.75 km) |
| Greer to Miranda do Corvo | 3,947.17 mi (6,352.36 km) |
| Greer to Mirandela | 3,970.71 mi (6,390.24 km) |
| Greer to Mogadouro | 3,996.95 mi (6,432.47 km) |
| Greer to Moimenta da Beira | 3,961.63 mi (6,375.62 km) |
| Greer to Moita | 3,949.93 mi (6,356.79 km) |
| Greer to Moncao | 3,894.09 mi (6,266.93 km) |
