| Piqua to Morris (Illinois) | 234.81 mi (377.89 km) |
| Piqua to Morristown (New Jersey) | 515.01 mi (828.83 km) |
| Piqua to Morristown (Tennessee) | 277.44 mi (446.49 km) |
| Piqua to Morrisville (North Carolina) | 418.87 mi (674.10 km) |
| Piqua to Morro Bay (California) | 2,012.10 mi (3,238.16 km) |
| Piqua to Morton (Illinois) | 276.69 mi (445.30 km) |
| Piqua to Morton Grove (Illinois) | 226.14 mi (363.93 km) |
| Piqua to Moscow (Idaho) | 1,691.37 mi (2,722.00 km) |
| Piqua to Moses Lake (Washington) | 1,800.15 mi (2,897.07 km) |
| Piqua to Moss Bluff (Louisiana) | 846.71 mi (1,362.64 km) |
| Piqua to Moss Point (Mississippi) | 713.91 mi (1,148.93 km) |
| Piqua to Moultrie (Georgia) | 621.82 mi (1,000.72 km) |
| Piqua to Mounds View (Minnesota) | 569.44 mi (916.42 km) |
| Piqua to Mount Airy (North Carolina) | 319.33 mi (513.91 km) |
| Piqua to Mount Clemens (Michigan) | 183.23 mi (294.87 km) |
