| Castlebar to Menen | 564.66 mi (908.73 km) |
| Castlebar to Merchtem | 603.20 mi (970.76 km) |
| Castlebar to Merelbeke | 583.15 mi (938.48 km) |
| Castlebar to Merksem | 603.80 mi (971.72 km) |
| Castlebar to Merksplas | 617.56 mi (993.87 km) |
| Castlebar to Mettet | 639.64 mi (1,029.40 km) |
| Castlebar to Meulebeke | 566.41 mi (911.55 km) |
| Castlebar to Middelkerke | 541.12 mi (870.86 km) |
| Castlebar to Mol | 632.35 mi (1,017.67 km) |
| Castlebar to Mons | 607.88 mi (978.29 km) |
| Castlebar to Montignies-le-Tilleul | 626.90 mi (1,008.90 km) |
| Castlebar to Moorslede | 559.43 mi (900.31 km) |
| Castlebar to Moortebeek | 610.62 mi (982.70 km) |
| Castlebar to Morlanwelz-Mariemont | 618.91 mi (996.04 km) |
| Castlebar to Mortsel | 606.86 mi (976.65 km) |
