| Castelo Branco to Masquefa | 501.60 mi (807.25 km) |
| Castelo Branco to Matadepera | 513.58 mi (826.53 km) |
| Castelo Branco to Mazarron | 366.96 mi (590.56 km) |
| Castelo Branco to Meco | 226.10 mi (363.88 km) |
| Castelo Branco to Medina del Campo | 169.96 mi (273.53 km) |
| Castelo Branco to Medina Sidonia | 246.92 mi (397.39 km) |
| Castelo Branco to Mejorada del Campo | 221.06 mi (355.76 km) |
| Castelo Branco to Meliana | 380.72 mi (612.71 km) |
| Castelo Branco to Mengibar | 236.00 mi (379.80 km) |
| Castelo Branco to Merida | 88.86 mi (143.01 km) |
| Castelo Branco to Miajadas | 89.24 mi (143.62 km) |
| Castelo Branco to Mieres | 253.45 mi (407.88 km) |
| Castelo Branco to Miguelturra | 198.43 mi (319.35 km) |
| Castelo Branco to Mijas | 271.29 mi (436.60 km) |
| Castelo Branco to Miranda de Ebro | 308.96 mi (497.22 km) |
