| Middle River to McHenry (Illinois) | 653.28 mi (1,051.36 km) |
| Middle River to McKeesport (Pennsylvania) | 194.02 mi (312.24 km) |
| Middle River to McKinleyville (California) | 2,488.09 mi (4,004.20 km) |
| Middle River to McKinney (Texas) | 1,201.49 mi (1,933.62 km) |
| Middle River to McLean (Virginia) | 49.62 mi (79.85 km) |
| Middle River to McMinnville (Oregon) | 2,390.70 mi (3,847.47 km) |
| Middle River to McMinnville (Tennessee) | 571.22 mi (919.29 km) |
| Middle River to McNair (Virginia) | 59.39 mi (95.58 km) |
| Middle River to McPherson (Kansas) | 1,141.87 mi (1,837.67 km) |
| Middle River to Mead Valley (California) | 2,278.89 mi (3,667.52 km) |
| Middle River to Meadow Woods (Florida) | 808.73 mi (1,301.52 km) |
| Middle River to Meadowbrook (Virginia) | 143.89 mi (231.57 km) |
| Middle River to Meadville (Pennsylvania) | 252.10 mi (405.72 km) |
| Middle River to Mebane (North Carolina) | 273.68 mi (440.45 km) |
| Middle River to Mechanicsville (Virginia) | 128.89 mi (207.43 km) |
