| South Portland to Masanasa | 3,518.65 mi (5,662.73 km) |
| South Portland to Masquefa | 3,551.66 mi (5,715.85 km) |
| South Portland to Matadepera | 3,558.00 mi (5,726.05 km) |
| South Portland to Mazarron | 3,536.92 mi (5,692.13 km) |
| South Portland to Meco | 3,344.67 mi (5,382.73 km) |
| South Portland to Medina del Campo | 3,247.37 mi (5,226.13 km) |
| South Portland to Medina Sidonia | 3,354.99 mi (5,399.33 km) |
| South Portland to Mejorada del Campo | 3,346.83 mi (5,386.20 km) |
| South Portland to Meliana | 3,517.01 mi (5,660.08 km) |
| South Portland to Mengibar | 3,405.67 mi (5,480.90 km) |
| South Portland to Merida | 3,254.84 mi (5,238.17 km) |
| South Portland to Miajadas | 3,259.61 mi (5,245.84 km) |
| South Portland to Mieres | 3,150.76 mi (5,070.66 km) |
| South Portland to Miguelturra | 3,366.05 mi (5,417.14 km) |
| South Portland to Mijas | 3,412.40 mi (5,491.73 km) |
