| River Grove to McHenry (Illinois) | 36.93 mi (59.44 km) |
| River Grove to McKeesport (Pennsylvania) | 429.95 mi (691.93 km) |
| River Grove to McKinleyville (California) | 1,864.73 mi (3,000.99 km) |
| River Grove to McKinney (Texas) | 771.77 mi (1,242.04 km) |
| River Grove to McLean (Virginia) | 595.93 mi (959.06 km) |
| River Grove to McMinnville (Oregon) | 1,770.04 mi (2,848.61 km) |
| River Grove to McMinnville (Tennessee) | 444.96 mi (716.09 km) |
| River Grove to McNair (Virginia) | 585.03 mi (941.52 km) |
| River Grove to McPherson (Kansas) | 573.44 mi (922.87 km) |
| River Grove to Mead Valley (California) | 1,690.50 mi (2,720.59 km) |
| River Grove to Meadow Woods (Florida) | 1,004.97 mi (1,617.34 km) |
| River Grove to Meadowbrook (Virginia) | 631.94 mi (1,017.01 km) |
| River Grove to Meadville (Pennsylvania) | 396.56 mi (638.21 km) |
| River Grove to Mebane (North Carolina) | 611.16 mi (983.56 km) |
| River Grove to Mechanicsville (Virginia) | 630.24 mi (1,014.27 km) |
