| Preakness to McHenry (Illinois) | 732.04 mi (1,178.10 km) |
| Preakness to McKeesport (Pennsylvania) | 297.46 mi (478.71 km) |
| Preakness to McKinleyville (California) | 2,565.60 mi (4,128.93 km) |
| Preakness to McKinney (Texas) | 1,342.78 mi (2,161.00 km) |
| Preakness to McLean (Virginia) | 209.14 mi (336.57 km) |
| Preakness to McMinnville (Oregon) | 2,450.83 mi (3,944.23 km) |
| Preakness to McMinnville (Tennessee) | 723.14 mi (1,163.78 km) |
| Preakness to McNair (Virginia) | 217.58 mi (350.16 km) |
| Preakness to McPherson (Kansas) | 1,255.40 mi (2,020.36 km) |
| Preakness to Mead Valley (California) | 2,389.55 mi (3,845.61 km) |
| Preakness to Meadow Woods (Florida) | 957.24 mi (1,540.53 km) |
| Preakness to Meadowbrook (Virginia) | 298.35 mi (480.14 km) |
| Preakness to Meadville (Pennsylvania) | 311.28 mi (500.95 km) |
| Preakness to Mebane (North Carolina) | 432.21 mi (695.58 km) |
| Preakness to Mechanicsville (Virginia) | 283.53 mi (456.31 km) |
