| Royston to Mangualde | 871.46 mi (1,402.48 km) |
| Royston to Marco de Canavezes | 842.74 mi (1,356.26 km) |
| Royston to Marinha Grande | 949.96 mi (1,528.81 km) |
| Royston to Massama | 1,020.23 mi (1,641.90 km) |
| Royston to Matosinhos | 854.83 mi (1,375.71 km) |
| Royston to Mealhada | 899.63 mi (1,447.82 km) |
| Royston to Melgaco | 787.07 mi (1,266.66 km) |
| Royston to Melres | 855.47 mi (1,376.75 km) |
| Royston to Mira | 902.53 mi (1,452.48 km) |
| Royston to Miranda do Corvo | 915.19 mi (1,472.86 km) |
| Royston to Mirandela | 803.68 mi (1,293.40 km) |
| Royston to Mogadouro | 804.58 mi (1,294.85 km) |
| Royston to Moimenta da Beira | 844.54 mi (1,359.15 km) |
| Royston to Moita | 1,021.04 mi (1,643.21 km) |
| Royston to Moncao | 794.67 mi (1,278.90 km) |
