Municipality Merger Mapper

Search an old municipality name or NIS code to see the successor municipality, new NIS code, merger date and current postcodes — then export the result to CSV.

The merger table and current postcode reference are bundled with the site.

The 2024–2025 merger wave

The Walloon Bastogne–Bertogne merger took effect on 2 December 2024; the Flemish merger wave took effect on 1 January 2025. The mapper keeps the actual effective date beside every old and new NIS code.

Official overview of new NIS codes

Is my data uploaded?

No. The municipality mapping runs in your browser, so nothing you add is sent to gratistools.be. See the privacy page for details.