| Round Lake Beach to McHenry (Illinois) | 11.18 mi (18.00 km) |
| Round Lake Beach to McKeesport (Pennsylvania) | 449.54 mi (723.47 km) |
| Round Lake Beach to McKinleyville (California) | 1,847.13 mi (2,972.67 km) |
| Round Lake Beach to McKinney (Texas) | 787.65 mi (1,267.60 km) |
| Round Lake Beach to McLean (Virginia) | 617.42 mi (993.63 km) |
| Round Lake Beach to McMinnville (Oregon) | 1,748.03 mi (2,813.19 km) |
| Round Lake Beach to McMinnville (Tennessee) | 478.56 mi (770.16 km) |
| Round Lake Beach to McNair (Virginia) | 606.71 mi (976.41 km) |
| Round Lake Beach to McPherson (Kansas) | 574.76 mi (924.98 km) |
| Round Lake Beach to Mead Valley (California) | 1,683.81 mi (2,709.82 km) |
| Round Lake Beach to Meadow Woods (Florida) | 1,038.75 mi (1,671.71 km) |
| Round Lake Beach to Meadowbrook (Virginia) | 657.28 mi (1,057.79 km) |
| Round Lake Beach to Meadville (Pennsylvania) | 410.28 mi (660.28 km) |
| Round Lake Beach to Mebane (North Carolina) | 640.66 mi (1,031.05 km) |
| Round Lake Beach to Mechanicsville (Virginia) | 655.04 mi (1,054.19 km) |
