| South Portland to Mombris | 3,600.63 mi (5,794.66 km) |
| South Portland to Monchengladbach | 3,459.19 mi (5,567.03 km) |
| South Portland to Monschau | 3,469.72 mi (5,583.97 km) |
| South Portland to Montabaur | 3,536.12 mi (5,690.84 km) |
| South Portland to Moosburg | 3,761.88 mi (6,054.16 km) |
| South Portland to Morbach | 3,525.46 mi (5,673.69 km) |
| South Portland to Morfelden-Walldorf | 3,579.24 mi (5,760.24 km) |
| South Portland to Morlenbach | 3,597.37 mi (5,789.41 km) |
| South Portland to Morsbach | 3,519.50 mi (5,664.09 km) |
| South Portland to Mosbach | 3,621.37 mi (5,828.03 km) |
| South Portland to Mosigkau | 3,667.46 mi (5,902.20 km) |
| South Portland to Mossingen | 3,646.81 mi (5,868.98 km) |
| South Portland to Much | 3,505.49 mi (5,641.55 km) |
| South Portland to Mucheln | 3,667.03 mi (5,901.52 km) |
| South Portland to Muhlacker | 3,621.16 mi (5,827.70 km) |
