| Silver Spring to Mangualde | 3,578.34 mi (5,758.78 km) |
| Silver Spring to Marco de Canavezes | 3,544.49 mi (5,704.31 km) |
| Silver Spring to Marinha Grande | 3,543.64 mi (5,702.93 km) |
| Silver Spring to Massama | 3,553.37 mi (5,718.59 km) |
| Silver Spring to Matosinhos | 3,517.91 mi (5,661.53 km) |
| Silver Spring to Mealhada | 3,550.63 mi (5,714.19 km) |
| Silver Spring to Melgaco | 3,515.38 mi (5,657.45 km) |
| Silver Spring to Melres | 3,535.39 mi (5,689.66 km) |
| Silver Spring to Mira | 3,535.52 mi (5,689.88 km) |
| Silver Spring to Miranda do Corvo | 3,563.77 mi (5,735.33 km) |
| Silver Spring to Mirandela | 3,583.35 mi (5,766.85 km) |
| Silver Spring to Mogadouro | 3,609.63 mi (5,809.14 km) |
| Silver Spring to Moimenta da Beira | 3,575.66 mi (5,754.47 km) |
| Silver Spring to Moita | 3,570.72 mi (5,746.52 km) |
| Silver Spring to Moncao | 3,506.24 mi (5,642.75 km) |
