| Prospect Heights to Mangualde | 3,994.99 mi (6,429.32 km) |
| Prospect Heights to Marco de Canavezes | 3,957.38 mi (6,368.79 km) |
| Prospect Heights to Marinha Grande | 3,971.28 mi (6,391.16 km) |
| Prospect Heights to Massama | 3,990.33 mi (6,421.82 km) |
| Prospect Heights to Matosinhos | 3,932.53 mi (6,328.80 km) |
| Prospect Heights to Mealhada | 3,971.38 mi (6,391.31 km) |
| Prospect Heights to Melgaco | 3,920.39 mi (6,309.25 km) |
| Prospect Heights to Melres | 3,950.09 mi (6,357.05 km) |
| Prospect Heights to Mira | 3,956.74 mi (6,367.76 km) |
| Prospect Heights to Miranda do Corvo | 3,986.54 mi (6,415.72 km) |
| Prospect Heights to Mirandela | 3,990.53 mi (6,422.13 km) |
| Prospect Heights to Mogadouro | 4,016.64 mi (6,464.16 km) |
| Prospect Heights to Moimenta da Beira | 3,988.61 mi (6,419.05 km) |
| Prospect Heights to Moita | 4,007.61 mi (6,449.63 km) |
| Prospect Heights to Moncao | 3,912.30 mi (6,296.24 km) |
