| Maaseik | LMK |  |
| Machelen | FMCH | |
| Macon | |
|
| Maffle | FFA | |
| Malavée | |
|
| Maldange | |
|
| Maldegem | FGM | |
| Malderen | FMD | |
| Malmédy | RMY | |
| Maltenheide | |
|
| Manage | FMN | |
| Marbais | GMB | |
| Marbehan | LMH | |
| Marbisoux | |
|
| Marche-en-Famenne | MCH | |
| Marche-les-Dames | NMD | |
| Marche-les-Ecaussinnes | FCZ | |
| Marchienne-au-pont | FMR | |
| Marchienne-Est | FMRS | |
| Marchienne-Zone | NZ | |
| Marchin | LAC | |
| Marcinelle-Haies | LAH | |
| Marcq | FMQ | |
| Maredret | |
|
| Marenne | MRE | |
| Maret | MAT | |
| Maria-Aalter | FIA | |
| Mariakerke | LKH | |
| Mariembourg | LMG | |
| Mariemont | LMT | |
| Marimont | LMT | |
| Marke | LKC | |
| Marloie | MML | |
| Marteau | |
|
| Martinrive | MTR | |
| Martouzin | |
|
| Maryve | |
|
| Masnuy-Saint-Pierre | FYP | |
| Masses-Diarbois | LDM | |
| Masta | GMA | |
| Matagne-la-Petite | |
|
| Matagne-le-Grande | LMA | |
| Maubray | MAU | |
| Mazy | FZY | |
| Mechelbaan | |
|
| Mechelen | FM | |
| Mechelen-Nekkerspoel | LNK | |
| Meiboom | |
|
| Meiser | MEI | |
| Meix-devant-Virton | MMV | |
| Meiz | |
|
| Melden | LED | |
| Mélen | |
|
| Melkouwen | MWC | |
| Melle | FML | |
| Mellier | MMR | |
| Melreux-Hotton | MLR | |
| Melsele | LM | |
| Melveren | GLV | |
| Menen | FME | |
| Menen-Bruggepoort | |
|
| Menen-Koekoek | |
|
| Merbes | |
|
| Merchtel | FMHT | |
| Merckhof | |
|
| Merelbeke | FKR | |
| Merlemont | LMN | |
| Merlemont-Village | |
|
| Merny | |
|
| Merode | MER | |
| Merxem | FMX | |
| Méry | MRY | |
| Mesen | LSE | |
| Meslin l'eveque | MLE | |
| Messancy | MY | |
| Mettet | MTT | |
| Meulebeke | LKE | |
| Mévergnies-Attre | FEV | |
| Michelbeke | MIC | |
| Micheroux | FCX | |
| Mignault | LGT | |
| Mijlbeke | |
|
| Millegem | |
|
| Milmort | LTM | |
| Milmort Charbonnage | |
|
| Mirwart | MRWRT | |
| Modave | LMD | |
| Modave-Village | |
|
| Moen-Heestert | FOH | |
| Moensberg | MOE | |
| Moerbeke-Waas | FMK | |
| Moere | |
|
| Moha | LMO | |
| Moignelée | |
|
| Mol | LML | |
| Molenheide | |
|
| Molenveld | |
|
| Mollem | LHL | |
| Momalle | MO | |
| Momignies | LMM | |
| Monceau-Pairotte | |
|
| Mons | FMS | |
| Monschau | RMJ | |
| Monstreux | |
|
| Monsville | LMV | |
| Mont-de-l'Eclus | |
|
| Mont-saint-Guibert | MM | |
| Mont-sur-Marchienne | MMA | |
| Montégnée | |
|
| Montenau | RMA | |
| Montignies-Formation | FMY | |
| Montignies-Neuville | |
|
| Montignies-sur-Sambre | GMT | |
| Montignies-sur-Sambre | GMT | |
| Montigny | MII | |
| Montzen | GMN | |
| Montzen-Village | |
|
| Moorsel | FMSL | |
| Moorsele-Kezelberg | |
|
| Moorslede | FMP | |
| Moortsele | FZM | |
| Moresnet | FES | |
| Morhet | MMT | |
| Morialmé | GMM | |
| Morlanwelz | LMZ | |
| Mornimont | |
|
| Mortsel | GMO | |
| Mortsel-Deurnsesteenweg | GMOD | |
| Mortsel-Liersesteenweg | GMOL | |
| Mortsel-Oude-God | GMOG | |
| Mouscron | FMC | |
| Moustier | FMT | |
| Mouterij | GMJ | |
| Muizen | FIZ | |
| Muizen | FYM | |
| Muizenhol | |
|
| Munkzwalm | MNK | |
| Munkzwalm | MNC | |
| Muno | GM | |
| Munsterbilzen | GMU | |
| Musson | |