| Rock Island to Maryland Heights (Missouri) | 190.16 mi (306.03 km) |
| Rock Island to Marysville (California) | 1,632.39 mi (2,627.07 km) |
| Rock Island to Marysville (Ohio) | 387.02 mi (622.85 km) |
| Rock Island to Marysville (Washington) | 1,601.84 mi (2,577.91 km) |
| Rock Island to Maryville (Missouri) | 237.02 mi (381.44 km) |
| Rock Island to Maryville (Tennessee) | 532.10 mi (856.33 km) |
| Rock Island to Mason (Ohio) | 361.09 mi (581.11 km) |
| Rock Island to Mason City (Iowa) | 177.00 mi (284.86 km) |
| Rock Island to Massapequa (New York) | 891.65 mi (1,434.97 km) |
| Rock Island to Massapequa Park (New York) | 892.58 mi (1,436.47 km) |
| Rock Island to Massillon (Ohio) | 473.54 mi (762.09 km) |
| Rock Island to Mastic (New York) | 922.33 mi (1,484.35 km) |
| Rock Island to Mastic Beach (New York) | 923.36 mi (1,486.00 km) |
| Rock Island to Matteson (Illinois) | 146.79 mi (236.24 km) |
| Rock Island to Matthews (North Carolina) | 691.38 mi (1,112.68 km) |
