| South Portland to Mexborough | 3,099.09 mi (4,987.50 km) |
| South Portland to Mickleover | 3,100.41 mi (4,989.63 km) |
| South Portland to Middlesbrough | 3,080.25 mi (4,957.18 km) |
| South Portland to Middleton | 3,062.37 mi (4,928.41 km) |
| South Portland to Middlewich | 3,059.19 mi (4,923.30 km) |
| South Portland to Midsomer Norton | 3,096.45 mi (4,983.25 km) |
| South Portland to Mildenhall | 3,194.48 mi (5,141.03 km) |
| South Portland to Milford Haven | 2,982.43 mi (4,799.76 km) |
| South Portland to Mill Hill | 3,180.99 mi (5,119.31 km) |
| South Portland to Milngavie | 2,939.95 mi (4,731.40 km) |
| South Portland to Milnrow | 3,064.31 mi (4,931.54 km) |
| South Portland to Milton | 3,073.93 mi (4,947.02 km) |
| South Portland to Milton Keynes | 3,150.25 mi (5,069.84 km) |
| South Portland to Minehead | 3,057.29 mi (4,920.23 km) |
| South Portland to Minster | 3,227.69 mi (5,194.46 km) |
