| Piqua to Montgomeryville (Pennsylvania) | 474.99 mi (764.43 km) |
| Piqua to Monticello (Minnesota) | 600.80 mi (966.90 km) |
| Piqua to Montrose (Colorado) | 1,264.04 mi (2,034.28 km) |
| Piqua to Moody (Alabama) | 469.45 mi (755.51 km) |
| Piqua to Moore (Oklahoma) | 794.92 mi (1,279.30 km) |
| Piqua to Moorestown-Lenola (New Jersey) | 490.69 mi (789.69 km) |
| Piqua to Mooresville (North Carolina) | 366.35 mi (589.59 km) |
| Piqua to Moorhead (Minnesota) | 778.11 mi (1,252.24 km) |
| Piqua to Moorpark (California) | 1,935.30 mi (3,114.56 km) |
| Piqua to Moraga (California) | 2,024.82 mi (3,258.64 km) |
| Piqua to Moreno Valley (California) | 1,856.68 mi (2,988.03 km) |
| Piqua to Morgan City (Louisiana) | 821.44 mi (1,321.98 km) |
| Piqua to Morgan Hill (California) | 2,014.06 mi (3,241.31 km) |
| Piqua to Morganton (North Carolina) | 334.69 mi (538.64 km) |
| Piqua to Morgantown (West Virginia) | 230.53 mi (371.00 km) |
