| Round Lake Beach to Maryland Heights (Missouri) | 282.37 mi (454.43 km) |
| Round Lake Beach to Marysville (California) | 1,755.82 mi (2,825.72 km) |
| Round Lake Beach to Marysville (Ohio) | 286.56 mi (461.17 km) |
| Round Lake Beach to Marysville (Washington) | 1,689.37 mi (2,718.78 km) |
| Round Lake Beach to Maryville (Missouri) | 379.00 mi (609.95 km) |
| Round Lake Beach to Maryville (Tennessee) | 508.19 mi (817.85 km) |
| Round Lake Beach to Mason (Ohio) | 287.31 mi (462.37 km) |
| Round Lake Beach to Mason City (Iowa) | 264.99 mi (426.45 km) |
| Round Lake Beach to Massapequa (New York) | 764.00 mi (1,229.54 km) |
| Round Lake Beach to Massapequa Park (New York) | 764.84 mi (1,230.89 km) |
| Round Lake Beach to Massillon (Ohio) | 356.18 mi (573.22 km) |
| Round Lake Beach to Mastic (New York) | 793.47 mi (1,276.97 km) |
| Round Lake Beach to Mastic Beach (New York) | 794.70 mi (1,278.95 km) |
| Round Lake Beach to Matteson (Illinois) | 62.49 mi (100.57 km) |
| Round Lake Beach to Matthews (North Carolina) | 639.25 mi (1,028.78 km) |
