| South Portland to Mankato (Minnesota) | 1,175.78 mi (1,892.24 km) |
| South Portland to Manor (Texas) | 1,748.38 mi (2,813.75 km) |
| South Portland to Manorville (New York) | 230.41 mi (370.81 km) |
| South Portland to Mansfield (Ohio) | 656.23 mi (1,056.09 km) |
| South Portland to Mansfield (Texas) | 1,636.68 mi (2,633.98 km) |
| South Portland to Manteca (California) | 2,655.79 mi (4,274.08 km) |
| South Portland to Manville (New Jersey) | 306.77 mi (493.70 km) |
| South Portland to Maple Grove (Minnesota) | 1,145.13 mi (1,842.91 km) |
| South Portland to Maple Heights (Ohio) | 593.71 mi (955.48 km) |
| South Portland to Maple Valley (Washington) | 2,472.89 mi (3,979.74 km) |
| South Portland to Mapleton (Utah) | 2,115.79 mi (3,405.03 km) |
| South Portland to Maplewood (Minnesota) | 1,124.27 mi (1,809.34 km) |
| South Portland to Marana (Arizona) | 2,327.68 mi (3,746.05 km) |
| South Portland to Marco Island (Florida) | 1,380.53 mi (2,221.74 km) |
| South Portland to Margate (Florida) | 1,323.76 mi (2,130.39 km) |
