| Prospect Heights to Mattoon (Illinois) | 182.90 mi (294.35 km) |
| Prospect Heights to Mauldin (South Carolina) | 590.03 mi (949.57 km) |
| Prospect Heights to Maumee (Ohio) | 222.51 mi (358.10 km) |
| Prospect Heights to Maumelle (Arkansas) | 556.19 mi (895.11 km) |
| Prospect Heights to Mayagüez (Puerto Rico) | 2,054.32 mi (3,306.11 km) |
| Prospect Heights to Mayfield Heights (Ohio) | 335.74 mi (540.32 km) |
| Prospect Heights to Mays Chapel (Maryland) | 617.61 mi (993.94 km) |
| Prospect Heights to Maywood (California) | 1,728.70 mi (2,782.07 km) |
| Prospect Heights to Maywood (Illinois) | 16.05 mi (25.83 km) |
| Prospect Heights to McAlester (Oklahoma) | 652.03 mi (1,049.34 km) |
| Prospect Heights to McAllen (Texas) | 1,243.43 mi (2,001.11 km) |
| Prospect Heights to McCalla (Alabama) | 610.09 mi (981.85 km) |
| Prospect Heights to McComb (Mississippi) | 763.37 mi (1,228.52 km) |
| Prospect Heights to McDonough (Georgia) | 632.98 mi (1,018.69 km) |
| Prospect Heights to McFarland (California) | 1,730.93 mi (2,785.66 km) |
