| South Portland to Maryland Heights (Missouri) | 1,100.01 mi (1,770.30 km) |
| South Portland to Marysville (California) | 2,634.32 mi (4,239.52 km) |
| South Portland to Marysville (Ohio) | 710.86 mi (1,144.02 km) |
| South Portland to Marysville (Washington) | 2,467.04 mi (3,970.32 km) |
| South Portland to Maryville (Missouri) | 1,277.78 mi (2,056.39 km) |
| South Portland to Maryville (Tennessee) | 907.15 mi (1,459.91 km) |
| South Portland to Mason (Ohio) | 781.76 mi (1,258.12 km) |
| South Portland to Mason City (Iowa) | 1,147.15 mi (1,846.15 km) |
| South Portland to Massapequa (New York) | 261.64 mi (421.06 km) |
| South Portland to Massapequa Park (New York) | 260.19 mi (418.74 km) |
| South Portland to Massillon (Ohio) | 607.17 mi (977.14 km) |
| South Portland to Mastic (New York) | 234.79 mi (377.85 km) |
| South Portland to Mastic Beach (New York) | 236.99 mi (381.39 km) |
| South Portland to Matteson (Illinois) | 898.57 mi (1,446.11 km) |
| South Portland to Matthews (North Carolina) | 808.42 mi (1,301.02 km) |
