| Castlebar to Lubbeek | 629.73 mi (1,013.45 km) |
| Castlebar to Lummen | 641.11 mi (1,031.77 km) |
| Castlebar to Maaseik | 661.28 mi (1,064.23 km) |
| Castlebar to Machelen | 612.88 mi (986.33 km) |
| Castlebar to Maldegem | 564.92 mi (909.15 km) |
| Castlebar to Malmedy | 690.01 mi (1,110.47 km) |
| Castlebar to Manage | 617.32 mi (993.48 km) |
| Castlebar to Marche-en-Famenne | 669.37 mi (1,077.24 km) |
| Castlebar to Mariakerke | 578.13 mi (930.41 km) |
| Castlebar to Mechelen | 611.26 mi (983.73 km) |
| Castlebar to Mechelen-aan-de-Maas | 660.79 mi (1,063.44 km) |
| Castlebar to Meerhout | 632.35 mi (1,017.68 km) |
| Castlebar to Meise | 608.12 mi (978.67 km) |
| Castlebar to Melle | 585.12 mi (941.66 km) |
| Castlebar to Melsele | 598.02 mi (962.42 km) |
