| Caerphilly to Marly-le-Roi | 300.26 mi (483.22 km) |
| Caerphilly to Marmande | 513.27 mi (826.02 km) |
| Caerphilly to Maromme | 236.54 mi (380.67 km) |
| Caerphilly to Marquette-les-Lille | 279.44 mi (449.71 km) |
| Caerphilly to Marseille | 697.90 mi (1,123.16 km) |
| Caerphilly to Martigues | 682.99 mi (1,099.16 km) |
| Caerphilly to Massy | 312.50 mi (502.93 km) |
| Caerphilly to Maubeuge | 325.66 mi (524.10 km) |
| Caerphilly to Mauguio | 644.22 mi (1,036.77 km) |
| Caerphilly to Mauleon | 340.31 mi (547.68 km) |
| Caerphilly to Maurepas | 299.96 mi (482.74 km) |
| Caerphilly to Maxeville | 459.73 mi (739.86 km) |
| Caerphilly to Mayenne | 254.15 mi (409.01 km) |
| Caerphilly to Mazamet | 616.15 mi (991.59 km) |
| Caerphilly to Meaux | 324.54 mi (522.30 km) |
