| Caerphilly to Mengen | 609.23 mi (980.46 km) |
| Caerphilly to Meppen | 451.94 mi (727.33 km) |
| Caerphilly to Merchweiler | 476.78 mi (767.30 km) |
| Caerphilly to Mering | 670.73 mi (1,079.43 km) |
| Caerphilly to Merseburg | 653.73 mi (1,052.07 km) |
| Caerphilly to Merzenich | 424.73 mi (683.54 km) |
| Caerphilly to Merzig | 456.00 mi (733.86 km) |
| Caerphilly to Meschede | 494.82 mi (796.34 km) |
| Caerphilly to Messkirch | 602.28 mi (969.28 km) |
| Caerphilly to Messstetten | 590.01 mi (949.53 km) |
| Caerphilly to Mettingen | 470.72 mi (757.55 km) |
| Caerphilly to Mettlach | 454.09 mi (730.79 km) |
| Caerphilly to Mettmann | 439.11 mi (706.69 km) |
| Caerphilly to Metzingen | 592.20 mi (953.06 km) |
| Caerphilly to Meuselwitz | 669.90 mi (1,078.11 km) |
