| Riverdale to Mangualde | 4,118.55 mi (6,628.16 km) |
| Riverdale to Marco de Canavezes | 4,085.93 mi (6,575.67 km) |
| Riverdale to Marinha Grande | 4,080.47 mi (6,566.88 km) |
| Riverdale to Massama | 4,086.85 mi (6,577.14 km) |
| Riverdale to Matosinhos | 4,058.94 mi (6,532.23 km) |
| Riverdale to Mealhada | 4,089.68 mi (6,581.71 km) |
| Riverdale to Melgaco | 4,059.08 mi (6,532.46 km) |
| Riverdale to Melres | 4,076.34 mi (6,560.23 km) |
| Riverdale to Mira | 4,074.49 mi (6,557.25 km) |
| Riverdale to Miranda do Corvo | 4,102.12 mi (6,601.73 km) |
| Riverdale to Mirandela | 4,126.25 mi (6,640.56 km) |
| Riverdale to Mogadouro | 4,152.49 mi (6,682.78 km) |
| Riverdale to Moimenta da Beira | 4,116.97 mi (6,625.63 km) |
| Riverdale to Moita | 4,104.15 mi (6,604.99 km) |
| Riverdale to Moncao | 4,049.70 mi (6,517.36 km) |
