| Herndon to Mangualde | 3,597.07 mi (5,788.92 km) |
| Herndon to Marco de Canavezes | 3,563.16 mi (5,734.35 km) |
| Herndon to Marinha Grande | 3,562.52 mi (5,733.32 km) |
| Herndon to Massama | 3,572.38 mi (5,749.19 km) |
| Herndon to Matosinhos | 3,536.60 mi (5,691.60 km) |
| Herndon to Mealhada | 3,569.41 mi (5,744.42 km) |
| Herndon to Melgaco | 3,533.92 mi (5,687.29 km) |
| Herndon to Melres | 3,554.08 mi (5,719.74 km) |
| Herndon to Mira | 3,554.31 mi (5,720.11 km) |
| Herndon to Miranda do Corvo | 3,582.58 mi (5,765.61 km) |
| Herndon to Mirandela | 3,601.94 mi (5,796.76 km) |
| Herndon to Mogadouro | 3,628.22 mi (5,839.05 km) |
| Herndon to Moimenta da Beira | 3,594.33 mi (5,784.52 km) |
| Herndon to Moita | 3,589.73 mi (5,777.12 km) |
| Herndon to Moncao | 3,524.79 mi (5,672.61 km) |
