| Poplar Bluff to Mangualde | 4,293.46 mi (6,909.65 km) |
| Poplar Bluff to Marco de Canavezes | 4,257.77 mi (6,852.21 km) |
| Poplar Bluff to Marinha Grande | 4,263.63 mi (6,861.65 km) |
| Poplar Bluff to Massama | 4,277.33 mi (6,883.70 km) |
| Poplar Bluff to Matosinhos | 4,231.93 mi (6,810.64 km) |
| Poplar Bluff to Mealhada | 4,267.56 mi (6,867.98 km) |
| Poplar Bluff to Melgaco | 4,224.77 mi (6,799.11 km) |
| Poplar Bluff to Melres | 4,249.49 mi (6,838.90 km) |
| Poplar Bluff to Mira | 4,252.64 mi (6,843.96 km) |
| Poplar Bluff to Miranda do Corvo | 4,281.65 mi (6,890.64 km) |
| Poplar Bluff to Mirandela | 4,293.98 mi (6,910.49 km) |
| Poplar Bluff to Mogadouro | 4,320.24 mi (6,952.75 km) |
| Poplar Bluff to Moimenta da Beira | 4,289.04 mi (6,902.54 km) |
| Poplar Bluff to Moita | 4,294.69 mi (6,911.64 km) |
| Poplar Bluff to Moncao | 4,216.12 mi (6,785.19 km) |
