| Middle River to Maryland Heights (Missouri) | 754.54 mi (1,214.32 km) |
| Middle River to Marysville (California) | 2,390.41 mi (3,846.99 km) |
| Middle River to Marysville (Ohio) | 373.10 mi (600.45 km) |
| Middle River to Marysville (Washington) | 2,325.42 mi (3,742.40 km) |
| Middle River to Maryville (Missouri) | 979.15 mi (1,575.80 km) |
| Middle River to Maryville (Tennessee) | 482.44 mi (776.41 km) |
| Middle River to Mason (Ohio) | 420.73 mi (677.09 km) |
| Middle River to Mason City (Iowa) | 908.42 mi (1,461.96 km) |
| Middle River to Massapequa (New York) | 181.15 mi (291.54 km) |
| Middle River to Massapequa Park (New York) | 182.59 mi (293.85 km) |
| Middle River to Massillon (Ohio) | 287.41 mi (462.53 km) |
| Middle River to Mastic (New York) | 214.52 mi (345.24 km) |
| Middle River to Mastic Beach (New York) | 213.70 mi (343.92 km) |
| Middle River to Matteson (Illinois) | 613.48 mi (987.30 km) |
| Middle River to Matthews (North Carolina) | 375.05 mi (603.59 km) |
