| Piqua to Mattoon (Illinois) | 223.43 mi (359.58 km) |
| Piqua to Mauldin (South Carolina) | 385.87 mi (620.99 km) |
| Piqua to Maumee (Ohio) | 102.63 mi (165.16 km) |
| Piqua to Maumelle (Arkansas) | 577.37 mi (929.19 km) |
| Piqua to Mayagüez (Puerto Rico) | 1,826.90 mi (2,940.11 km) |
| Piqua to Mayfield Heights (Ohio) | 173.77 mi (279.66 km) |
| Piqua to Mays Chapel (Maryland) | 405.98 mi (653.36 km) |
| Piqua to Maywood (California) | 1,906.82 mi (3,068.73 km) |
| Piqua to Maywood (Illinois) | 222.46 mi (358.01 km) |
| Piqua to McAlester (Oklahoma) | 726.67 mi (1,169.47 km) |
| Piqua to McAllen (Texas) | 1,254.16 mi (2,018.38 km) |
| Piqua to McCalla (Alabama) | 497.61 mi (800.83 km) |
| Piqua to McComb (Mississippi) | 707.19 mi (1,138.11 km) |
| Piqua to McDonough (Georgia) | 463.71 mi (746.26 km) |
| Piqua to McFarland (California) | 1,919.90 mi (3,089.79 km) |
