| Sumter to Mangualde | 3,906.37 mi (6,286.69 km) |
| Sumter to Marco de Canavezes | 3,874.64 mi (6,235.63 km) |
| Sumter to Marinha Grande | 3,866.20 mi (6,222.04 km) |
| Sumter to Massama | 3,870.73 mi (6,229.33 km) |
| Sumter to Matosinhos | 3,847.39 mi (6,191.78 km) |
| Sumter to Mealhada | 3,876.77 mi (6,239.06 km) |
| Sumter to Melgaco | 3,849.54 mi (6,195.24 km) |
| Sumter to Melres | 3,864.71 mi (6,219.65 km) |
| Sumter to Mira | 3,861.53 mi (6,214.53 km) |
| Sumter to Miranda do Corvo | 3,888.75 mi (6,258.34 km) |
| Sumter to Mirandela | 3,916.01 mi (6,302.20 km) |
| Sumter to Mogadouro | 3,942.18 mi (6,344.33 km) |
| Sumter to Moimenta da Beira | 3,905.56 mi (6,285.39 km) |
| Sumter to Moita | 3,887.99 mi (6,257.11 km) |
| Sumter to Moncao | 3,839.97 mi (6,179.83 km) |
