| Piqua to Marrero (Louisiana) | 782.55 mi (1,259.39 km) |
| Piqua to Marshall (Minnesota) | 659.71 mi (1,061.70 km) |
| Piqua to Marshall (Missouri) | 481.75 mi (775.29 km) |
| Piqua to Marshall (Texas) | 769.17 mi (1,237.87 km) |
| Piqua to Marshalltown (Iowa) | 469.24 mi (755.17 km) |
| Piqua to Marshfield (Wisconsin) | 434.14 mi (698.67 km) |
| Piqua to Martha Lake (Washington) | 1,939.97 mi (3,122.09 km) |
| Piqua to Martin (Tennessee) | 363.04 mi (584.26 km) |
| Piqua to Martinez (California) | 2,021.48 mi (3,253.25 km) |
| Piqua to Martinez (Georgia) | 473.14 mi (761.44 km) |
| Piqua to Martinsburg (West Virginia) | 335.97 mi (540.70 km) |
| Piqua to Martinsville (Indiana) | 126.78 mi (204.03 km) |
| Piqua to Martinsville (New Jersey) | 509.63 mi (820.17 km) |
| Piqua to Martinsville (Virginia) | 337.03 mi (542.40 km) |
| Piqua to Maryland City (Maryland) | 402.34 mi (647.50 km) |
