| Rock Island to Mattoon (Illinois) | 180.46 mi (290.43 km) |
| Rock Island to Mauldin (South Carolina) | 644.39 mi (1,037.05 km) |
| Rock Island to Maumee (Ohio) | 357.91 mi (576.00 km) |
| Rock Island to Maumelle (Arkansas) | 467.74 mi (752.76 km) |
| Rock Island to Mayagüez (Puerto Rico) | 2,120.79 mi (3,413.09 km) |
| Rock Island to Mayfield Heights (Ohio) | 472.26 mi (760.03 km) |
| Rock Island to Mays Chapel (Maryland) | 744.96 mi (1,198.90 km) |
| Rock Island to Maywood (California) | 1,586.53 mi (2,553.28 km) |
| Rock Island to Maywood (Illinois) | 144.13 mi (231.96 km) |
| Rock Island to McAlester (Oklahoma) | 532.56 mi (857.07 km) |
| Rock Island to McAllen (Texas) | 1,140.21 mi (1,835.00 km) |
| Rock Island to McCalla (Alabama) | 596.92 mi (960.66 km) |
| Rock Island to McComb (Mississippi) | 706.55 mi (1,137.09 km) |
| Rock Island to McDonough (Georgia) | 657.03 mi (1,057.39 km) |
| Rock Island to McFarland (California) | 1,590.92 mi (2,560.34 km) |
