| Grantham to Mangualde | 914.07 mi (1,471.06 km) |
| Grantham to Marco de Canavezes | 883.40 mi (1,421.69 km) |
| Grantham to Marinha Grande | 990.59 mi (1,594.20 km) |
| Grantham to Massama | 1,061.29 mi (1,707.98 km) |
| Grantham to Matosinhos | 893.89 mi (1,438.58 km) |
| Grantham to Mealhada | 940.66 mi (1,513.84 km) |
| Grantham to Melgaco | 825.75 mi (1,328.91 km) |
| Grantham to Melres | 895.59 mi (1,441.32 km) |
| Grantham to Mira | 942.70 mi (1,517.14 km) |
| Grantham to Miranda do Corvo | 956.94 mi (1,540.04 km) |
| Grantham to Mirandela | 846.68 mi (1,362.61 km) |
| Grantham to Mogadouro | 849.15 mi (1,366.57 km) |
| Grantham to Moimenta da Beira | 887.03 mi (1,427.54 km) |
| Grantham to Moita | 1,062.96 mi (1,710.67 km) |
| Grantham to Moncao | 832.78 mi (1,340.22 km) |
