| Piqua to Mombris | 4,302.75 mi (6,924.60 km) |
| Piqua to Monchengladbach | 4,159.96 mi (6,694.82 km) |
| Piqua to Monschau | 4,174.20 mi (6,717.72 km) |
| Piqua to Montabaur | 4,238.63 mi (6,821.42 km) |
| Piqua to Moosburg | 4,466.91 mi (7,188.79 km) |
| Piqua to Morbach | 4,232.35 mi (6,811.31 km) |
| Piqua to Morfelden-Walldorf | 4,282.72 mi (6,892.37 km) |
| Piqua to Morlenbach | 4,302.61 mi (6,924.37 km) |
| Piqua to Morsbach | 4,219.93 mi (6,791.32 km) |
| Piqua to Mosbach | 4,327.12 mi (6,963.83 km) |
| Piqua to Mosigkau | 4,354.32 mi (7,007.59 km) |
| Piqua to Mossingen | 4,357.26 mi (7,012.33 km) |
| Piqua to Much | 4,206.19 mi (6,769.21 km) |
| Piqua to Mucheln | 4,357.72 mi (7,013.07 km) |
| Piqua to Muhlacker | 4,329.41 mi (6,967.51 km) |
