| Sheffield to Mangualde | 930.33 mi (1,497.23 km) |
| Sheffield to Marco de Canavezes | 898.08 mi (1,445.32 km) |
| Sheffield to Marinha Grande | 1,004.98 mi (1,617.36 km) |
| Sheffield to Massama | 1,075.91 mi (1,731.50 km) |
| Sheffield to Matosinhos | 907.22 mi (1,460.02 km) |
| Sheffield to Mealhada | 955.50 mi (1,537.73 km) |
| Sheffield to Melgaco | 838.96 mi (1,350.17 km) |
| Sheffield to Melres | 909.79 mi (1,464.17 km) |
| Sheffield to Mira | 956.83 mi (1,539.86 km) |
| Sheffield to Miranda do Corvo | 972.35 mi (1,564.85 km) |
| Sheffield to Mirandela | 863.47 mi (1,389.62 km) |
| Sheffield to Mogadouro | 867.27 mi (1,395.74 km) |
| Sheffield to Moimenta da Beira | 903.27 mi (1,453.67 km) |
| Sheffield to Moita | 1,078.31 mi (1,735.36 km) |
| Sheffield to Moncao | 845.49 mi (1,360.68 km) |
