| Upper Arlington to Mangualde | 3,836.55 mi (6,174.32 km) |
| Upper Arlington to Marco de Canavezes | 3,800.86 mi (6,116.89 km) |
| Upper Arlington to Marinha Grande | 3,806.89 mi (6,126.59 km) |
| Upper Arlington to Massama | 3,820.95 mi (6,149.22 km) |
| Upper Arlington to Matosinhos | 3,775.02 mi (6,075.31 km) |
| Upper Arlington to Mealhada | 3,810.68 mi (6,132.70 km) |
| Upper Arlington to Melgaco | 3,767.95 mi (6,063.94 km) |
| Upper Arlington to Melres | 3,792.58 mi (6,103.57 km) |
| Upper Arlington to Mira | 3,795.76 mi (6,108.69 km) |
| Upper Arlington to Miranda do Corvo | 3,824.80 mi (6,155.42 km) |
| Upper Arlington to Mirandela | 3,837.12 mi (6,175.25 km) |
| Upper Arlington to Mogadouro | 3,863.39 mi (6,217.52 km) |
| Upper Arlington to Moimenta da Beira | 3,832.13 mi (6,167.21 km) |
| Upper Arlington to Moita | 3,838.31 mi (6,177.16 km) |
| Upper Arlington to Moncao | 3,759.29 mi (6,049.99 km) |
