| Sierpc to Marco de Canavezes | 1,524.70 mi (2,453.77 km) |
| Sierpc to Marinha Grande | 1,621.96 mi (2,610.30 km) |
| Sierpc to Massama | 1,682.92 mi (2,708.40 km) |
| Sierpc to Matosinhos | 1,546.19 mi (2,488.35 km) |
| Sierpc to Mealhada | 1,573.40 mi (2,532.14 km) |
| Sierpc to Melgaco | 1,487.37 mi (2,393.68 km) |
| Sierpc to Melres | 1,539.79 mi (2,478.05 km) |
| Sierpc to Mira | 1,582.03 mi (2,546.04 km) |
| Sierpc to Miranda do Corvo | 1,582.25 mi (2,546.38 km) |
| Sierpc to Mirandela | 1,473.24 mi (2,370.95 km) |
| Sierpc to Mogadouro | 1,462.25 mi (2,353.26 km) |
| Sierpc to Moimenta da Beira | 1,513.25 mi (2,435.34 km) |
| Sierpc to Moita | 1,677.05 mi (2,698.95 km) |
| Sierpc to Moncao | 1,497.70 mi (2,410.32 km) |
| Sierpc to Montalegre | 1,481.73 mi (2,384.61 km) |
