| Jabbeke | FJB |  |
| Jabbeke | FGB | |
| Jamagne | |
|
| Jambe-de-Bois | |
|
| Jambes | NJ | |
| Jambes-Est | NJE | |
| Jambes-État | MJS | |
| Jambes-Nord | NJ | |
| Jamioulx | GJ | |
| Jamoigne | LJN | |
| Jauche | FJB | |
| Java | NJV | |
| Jemappes | FJM | |
| Jemelle | LJ | |
| Jemeppe-Froidmont | LJF | |
| Jemeppe-sur-Meuse | FJU | |
| Jemeppe-sur-Sambre | FJS | |
| Jemeppe-sur-Sambre-Marchandise | FJSMA | |
| Jemeppes-sur-Sambre-Marchandise | FJSMA | |
| Jesseren | FJN | |
| Jette | FJT | |
| Jeuk | FSX | |
| Jodoigne | FJD | |
| Josaphat | |
|
| Jumet | LJM | |
| Jumet-Brûlotte | LJM | |
| Jupille | FJ | |
| Jurbise | FJR | |
| Juslenville | FJL | |