| Portici to Masquefa | 652.78 mi (1,050.55 km) |
| Portici to Matadepera | 641.93 mi (1,033.08 km) |
| Portici to Mazarron | 865.84 mi (1,393.43 km) |
| Portici to Meco | 924.24 mi (1,487.42 km) |
| Portici to Medina del Campo | 1,001.78 mi (1,612.21 km) |
| Portici to Medina Sidonia | 1,130.94 mi (1,820.07 km) |
| Portici to Mejorada del Campo | 928.72 mi (1,494.64 km) |
| Portici to Meliana | 779.75 mi (1,254.89 km) |
| Portici to Mengibar | 987.04 mi (1,588.49 km) |
| Portici to Merida | 1,101.90 mi (1,773.34 km) |
| Portici to Miajadas | 1,084.06 mi (1,744.62 km) |
| Portici to Mieres | 1,043.35 mi (1,679.12 km) |
| Portici to Miguelturra | 976.23 mi (1,571.09 km) |
| Portici to Mijas | 1,061.32 mi (1,708.03 km) |
| Portici to Miranda de Ebro | 898.08 mi (1,445.31 km) |
