| Castelo Branco to Marco de Canavezes | 100.41 mi (161.59 km) |
| Castelo Branco to Marinha Grande | 76.24 mi (122.70 km) |
| Castelo Branco to Massama | 119.88 mi (192.92 km) |
| Castelo Branco to Matosinhos | 113.53 mi (182.71 km) |
| Castelo Branco to Mealhada | 63.67 mi (102.46 km) |
| Castelo Branco to Melgaco | 163.87 mi (263.72 km) |
| Castelo Branco to Melres | 98.48 mi (158.49 km) |
| Castelo Branco to Mira | 77.85 mi (125.28 km) |
| Castelo Branco to Miranda do Corvo | 48.28 mi (77.70 km) |
| Castelo Branco to Mirandela | 116.49 mi (187.47 km) |
| Castelo Branco to Mogadouro | 112.56 mi (181.15 km) |
| Castelo Branco to Moimenta da Beira | 80.58 mi (129.68 km) |
| Castelo Branco to Moita | 113.13 mi (182.07 km) |
| Castelo Branco to Moncao | 164.09 mi (264.07 km) |
| Castelo Branco to Montalegre | 139.47 mi (224.45 km) |
