| Rockford to McHenry (Illinois) | 39.77 mi (64.00 km) |
| Rockford to McKeesport (Pennsylvania) | 496.30 mi (798.71 km) |
| Rockford to McKinleyville (California) | 1,798.87 mi (2,895.00 km) |
| Rockford to McKinney (Texas) | 750.47 mi (1,207.76 km) |
| Rockford to McLean (Virginia) | 662.78 mi (1,066.65 km) |
| Rockford to McMinnville (Oregon) | 1,703.06 mi (2,740.81 km) |
| Rockford to McMinnville (Tennessee) | 487.09 mi (783.89 km) |
| Rockford to McNair (Virginia) | 651.91 mi (1,049.16 km) |
| Rockford to McPherson (Kansas) | 526.19 mi (846.82 km) |
| Rockford to Mead Valley (California) | 1,632.94 mi (2,627.97 km) |
| Rockford to Meadow Woods (Florida) | 1,052.56 mi (1,693.94 km) |
| Rockford to Meadowbrook (Virginia) | 698.67 mi (1,124.41 km) |
| Rockford to Meadville (Pennsylvania) | 459.93 mi (740.19 km) |
| Rockford to Mebane (North Carolina) | 675.24 mi (1,086.69 km) |
| Rockford to Mechanicsville (Virginia) | 697.08 mi (1,121.85 km) |
