| Gaithersburg to Mangualde | 3,583.77 mi (5,767.52 km) |
| Gaithersburg to Marco de Canavezes | 3,549.80 mi (5,712.85 km) |
| Gaithersburg to Marinha Grande | 3,549.38 mi (5,712.18 km) |
| Gaithersburg to Massama | 3,559.39 mi (5,728.29 km) |
| Gaithersburg to Matosinhos | 3,523.26 mi (5,670.14 km) |
| Gaithersburg to Mealhada | 3,556.17 mi (5,723.11 km) |
| Gaithersburg to Melgaco | 3,520.45 mi (5,665.61 km) |
| Gaithersburg to Melres | 3,540.75 mi (5,698.29 km) |
| Gaithersburg to Mira | 3,541.08 mi (5,698.81 km) |
| Gaithersburg to Miranda do Corvo | 3,569.37 mi (5,744.35 km) |
| Gaithersburg to Mirandela | 3,588.51 mi (5,775.14 km) |
| Gaithersburg to Mogadouro | 3,614.79 mi (5,817.43 km) |
| Gaithersburg to Moimenta da Beira | 3,580.98 mi (5,763.03 km) |
| Gaithersburg to Moita | 3,576.75 mi (5,756.22 km) |
| Gaithersburg to Moncao | 3,511.34 mi (5,650.95 km) |
