| Rockville to Mangualde | 3,582.48 mi (5,765.45 km) |
| Rockville to Marco de Canavezes | 3,548.56 mi (5,710.85 km) |
| Rockville to Marinha Grande | 3,547.98 mi (5,709.92 km) |
| Rockville to Massama | 3,557.89 mi (5,725.88 km) |
| Rockville to Matosinhos | 3,522.00 mi (5,668.11 km) |
| Rockville to Mealhada | 3,554.85 mi (5,720.97 km) |
| Rockville to Melgaco | 3,519.29 mi (5,663.75 km) |
| Rockville to Melres | 3,539.49 mi (5,696.26 km) |
| Rockville to Mira | 3,539.74 mi (5,696.67 km) |
| Rockville to Miranda do Corvo | 3,568.02 mi (5,742.18 km) |
| Rockville to Mirandela | 3,587.32 mi (5,773.23 km) |
| Rockville to Mogadouro | 3,613.60 mi (5,815.52 km) |
| Rockville to Moimenta da Beira | 3,579.73 mi (5,761.03 km) |
| Rockville to Moita | 3,575.25 mi (5,753.81 km) |
| Rockville to Moncao | 3,510.17 mi (5,649.07 km) |
