| Williamsport to Mangualde | 3,514.89 mi (5,656.67 km) |
| Williamsport to Marco de Canavezes | 3,479.73 mi (5,600.09 km) |
| Williamsport to Marinha Grande | 3,483.82 mi (5,606.66 km) |
| Williamsport to Massama | 3,496.81 mi (5,627.58 km) |
| Williamsport to Matosinhos | 3,453.66 mi (5,558.13 km) |
| Williamsport to Mealhada | 3,488.48 mi (5,614.17 km) |
| Williamsport to Melgaco | 3,448.01 mi (5,549.03 km) |
| Williamsport to Melres | 3,471.20 mi (5,586.36 km) |
| Williamsport to Mira | 3,473.50 mi (5,590.07 km) |
| Williamsport to Miranda do Corvo | 3,502.33 mi (5,636.46 km) |
| Williamsport to Mirandela | 3,516.82 mi (5,659.78 km) |
| Williamsport to Mogadouro | 3,543.10 mi (5,702.08 km) |
| Williamsport to Moimenta da Beira | 3,510.99 mi (5,650.39 km) |
| Williamsport to Moita | 3,514.17 mi (5,655.52 km) |
| Williamsport to Moncao | 3,439.18 mi (5,534.83 km) |
