| Caerphilly to Mombris | 549.85 mi (884.91 km) |
| Caerphilly to Monchengladbach | 416.64 mi (670.52 km) |
| Caerphilly to Monschau | 417.01 mi (671.12 km) |
| Caerphilly to Montabaur | 486.06 mi (782.24 km) |
| Caerphilly to Moosburg | 704.60 mi (1,133.94 km) |
| Caerphilly to Morbach | 467.93 mi (753.07 km) |
| Caerphilly to Morfelden-Walldorf | 526.25 mi (846.92 km) |
| Caerphilly to Morlenbach | 541.26 mi (871.08 km) |
| Caerphilly to Morsbach | 475.27 mi (764.88 km) |
| Caerphilly to Mosbach | 564.36 mi (908.25 km) |
| Caerphilly to Mosigkau | 660.58 mi (1,063.10 km) |
| Caerphilly to Mossingen | 586.75 mi (944.28 km) |
| Caerphilly to Much | 461.08 mi (742.04 km) |
| Caerphilly to Mucheln | 645.96 mi (1,039.57 km) |
| Caerphilly to Muhlacker | 561.87 mi (904.24 km) |
