| Rockford to Mattoon (Illinois) | 195.69 mi (314.94 km) |
| Rockford to Mauldin (South Carolina) | 632.36 mi (1,017.69 km) |
| Rockford to Maumee (Ohio) | 281.67 mi (453.31 km) |
| Rockford to Maumelle (Arkansas) | 542.49 mi (873.05 km) |
| Rockford to Mayagüez (Puerto Rico) | 2,102.30 mi (3,383.32 km) |
| Rockford to Mayfield Heights (Ohio) | 394.67 mi (635.16 km) |
| Rockford to Mays Chapel (Maryland) | 676.76 mi (1,089.14 km) |
| Rockford to Maywood (California) | 1,673.08 mi (2,692.56 km) |
| Rockford to Maywood (Illinois) | 67.84 mi (109.18 km) |
| Rockford to McAlester (Oklahoma) | 622.47 mi (1,001.77 km) |
| Rockford to McAllen (Texas) | 1,223.91 mi (1,969.70 km) |
| Rockford to McCalla (Alabama) | 628.72 mi (1,011.83 km) |
| Rockford to McComb (Mississippi) | 765.04 mi (1,231.21 km) |
| Rockford to McDonough (Georgia) | 665.44 mi (1,070.92 km) |
| Rockford to McFarland (California) | 1,673.87 mi (2,693.83 km) |
