| South River to McHenry (Illinois) | 732.16 mi (1,178.29 km) |
| South River to McKeesport (Pennsylvania) | 287.66 mi (462.94 km) |
| South River to McKinleyville (California) | 2,567.97 mi (4,132.76 km) |
| South River to McKinney (Texas) | 1,325.82 mi (2,133.70 km) |
| South River to McLean (Virginia) | 182.14 mi (293.13 km) |
| South River to McMinnville (Oregon) | 2,457.29 mi (3,954.63 km) |
| South River to McMinnville (Tennessee) | 701.26 mi (1,128.57 km) |
| South River to McNair (Virginia) | 191.45 mi (308.11 km) |
| South River to McPherson (Kansas) | 1,247.48 mi (2,007.62 km) |
| South River to Mead Valley (California) | 2,383.04 mi (3,835.14 km) |
| South River to Meadow Woods (Florida) | 923.29 mi (1,485.89 km) |
| South River to Meadowbrook (Virginia) | 266.58 mi (429.02 km) |
| South River to Meadville (Pennsylvania) | 311.78 mi (501.76 km) |
| South River to Mebane (North Carolina) | 401.46 mi (646.09 km) |
| South River to Mechanicsville (Virginia) | 251.92 mi (405.43 km) |
