| Clacton-on-Sea to Mangualde | 881.08 mi (1,417.96 km) |
| Clacton-on-Sea to Marco de Canavezes | 854.49 mi (1,375.17 km) |
| Clacton-on-Sea to Marinha Grande | 961.38 mi (1,547.19 km) |
| Clacton-on-Sea to Massama | 1,031.01 mi (1,659.25 km) |
| Clacton-on-Sea to Matosinhos | 868.12 mi (1,397.10 km) |
| Clacton-on-Sea to Mealhada | 910.80 mi (1,465.79 km) |
| Clacton-on-Sea to Melgaco | 801.00 mi (1,289.09 km) |
| Clacton-on-Sea to Melres | 867.71 mi (1,396.45 km) |
| Clacton-on-Sea to Mira | 914.55 mi (1,471.83 km) |
| Clacton-on-Sea to Miranda do Corvo | 925.58 mi (1,489.57 km) |
| Clacton-on-Sea to Mirandela | 813.13 mi (1,308.60 km) |
| Clacton-on-Sea to Mogadouro | 812.33 mi (1,307.32 km) |
| Clacton-on-Sea to Moimenta da Beira | 854.37 mi (1,374.98 km) |
| Clacton-on-Sea to Moita | 1,030.94 mi (1,659.14 km) |
| Clacton-on-Sea to Moncao | 809.13 mi (1,302.16 km) |
