| Prospect Heights to McHenry (Illinois) | 24.80 mi (39.91 km) |
| Prospect Heights to McKeesport (Pennsylvania) | 437.14 mi (703.51 km) |
| Prospect Heights to McKinleyville (California) | 1,858.08 mi (2,990.28 km) |
| Prospect Heights to McKinney (Texas) | 778.13 mi (1,252.28 km) |
| Prospect Heights to McLean (Virginia) | 603.95 mi (971.96 km) |
| Prospect Heights to McMinnville (Oregon) | 1,761.64 mi (2,835.09 km) |
| Prospect Heights to McMinnville (Tennessee) | 458.13 mi (737.28 km) |
| Prospect Heights to McNair (Virginia) | 593.13 mi (954.54 km) |
| Prospect Heights to McPherson (Kansas) | 574.04 mi (923.84 km) |
| Prospect Heights to Mead Valley (California) | 1,688.13 mi (2,716.78 km) |
| Prospect Heights to Meadow Woods (Florida) | 1,018.17 mi (1,638.58 km) |
| Prospect Heights to Meadowbrook (Virginia) | 641.54 mi (1,032.46 km) |
| Prospect Heights to Meadville (Pennsylvania) | 401.35 mi (645.91 km) |
| Prospect Heights to Mebane (North Carolina) | 622.48 mi (1,001.79 km) |
| Prospect Heights to Mechanicsville (Virginia) | 639.62 mi (1,029.37 km) |
