| Webster Groves to Mangualde | 4,225.48 mi (6,800.25 km) |
| Webster Groves to Marco de Canavezes | 4,188.98 mi (6,741.51 km) |
| Webster Groves to Marinha Grande | 4,198.13 mi (6,756.24 km) |
| Webster Groves to Massama | 4,214.00 mi (6,781.78 km) |
| Webster Groves to Matosinhos | 4,163.53 mi (6,700.56 km) |
| Webster Groves to Mealhada | 4,200.50 mi (6,760.05 km) |
| Webster Groves to Melgaco | 4,154.30 mi (6,685.70 km) |
| Webster Groves to Melres | 4,181.10 mi (6,728.83 km) |
| Webster Groves to Mira | 4,185.68 mi (6,736.21 km) |
| Webster Groves to Miranda do Corvo | 4,215.04 mi (6,783.45 km) |
| Webster Groves to Mirandela | 4,223.94 mi (6,797.78 km) |
| Webster Groves to Mogadouro | 4,250.16 mi (6,839.97 km) |
| Webster Groves to Moimenta da Beira | 4,220.25 mi (6,791.84 km) |
| Webster Groves to Moita | 4,231.34 mi (6,809.68 km) |
| Webster Groves to Moncao | 4,145.88 mi (6,672.15 km) |
