| Caerphilly to Menen | 279.73 mi (450.18 km) |
| Caerphilly to Merchtem | 324.70 mi (522.56 km) |
| Caerphilly to Merelbeke | 303.61 mi (488.61 km) |
| Caerphilly to Merksem | 330.75 mi (532.29 km) |
| Caerphilly to Merksplas | 348.08 mi (560.17 km) |
| Caerphilly to Mettet | 353.46 mi (568.84 km) |
| Caerphilly to Meulebeke | 284.47 mi (457.80 km) |
| Caerphilly to Middelkerke | 261.68 mi (421.14 km) |
| Caerphilly to Mol | 360.26 mi (579.79 km) |
| Caerphilly to Mons | 321.04 mi (516.66 km) |
| Caerphilly to Montignies-le-Tilleul | 340.63 mi (548.19 km) |
| Caerphilly to Moorslede | 275.75 mi (443.77 km) |
| Caerphilly to Moortebeek | 330.68 mi (532.18 km) |
| Caerphilly to Morlanwelz-Mariemont | 332.98 mi (535.88 km) |
| Caerphilly to Mortsel | 332.52 mi (535.13 km) |
