| Grefrath to Monchengladbach | 10.23 mi (16.47 km) |
| Grefrath to Monschau | 53.76 mi (86.52 km) |
| Grefrath to Montabaur | 89.70 mi (144.35 km) |
| Grefrath to Moosburg | 318.05 mi (511.86 km) |
| Grefrath to Morbach | 110.37 mi (177.63 km) |
| Grefrath to Morfelden-Walldorf | 134.78 mi (216.91 km) |
| Grefrath to Morlenbach | 159.71 mi (257.03 km) |
| Grefrath to Morsbach | 67.94 mi (109.34 km) |
| Grefrath to Mosbach | 184.64 mi (297.14 km) |
| Grefrath to Mosigkau | 255.22 mi (410.74 km) |
| Grefrath to Mossingen | 235.79 mi (379.47 km) |
| Grefrath to Much | 54.31 mi (87.41 km) |
| Grefrath to Mucheln | 235.70 mi (379.33 km) |
| Grefrath to Muhlacker | 198.53 mi (319.51 km) |
| Grefrath to Muhldorf | 348.57 mi (560.97 km) |
