Belgian Postcodes & NIS Codes

Find a Belgian postcode, municipality or NIS code

Type a postcode such as 9000, a place name such as Gent or Liège, or a five-digit NIS code. The page shows the matching places with their municipality, sub-municipality (deelgemeente or section), province and NIS code, in Dutch and in French where both names exist. The full list can be downloaded as CSV for use in spreadsheets, CRM imports or address validation.

The search runs on your device against a bundled list. Sources are the bpost postcode list and the Statbel REFNIS 2025 codes, licensed CC BY 4.0.

Postcodes, municipalities and NIS codes are three different things

• Postcodes are assigned by bpost to places for mail delivery. One municipality can have many postcodes, as in Antwerpen. One postcode can also cover several places, including sub-municipalities that merged in 1977.
• Municipalities are the 565 administrative units after the 2025 mergers.
• NIS or REFNIS codes from Statbel identify those municipalities for statistics and administration. They have five digits and the first digits encode the province and district, for example 41081 for Zottegem. You meet them in KBO data, tax forms and government APIs.

The first digit of a postcode

Belgian postcodes have four digits and roughly follow geography. Codes starting with 1 cover Brussels and the Brabant area, 2 is the province of Antwerp, 3 Leuven and Limburg, 4 Liège, 5 Namur, 6 Hainaut (Charleroi) and Luxembourg, 7 Hainaut (Mons, Tournai), 8 West Flanders and 9 East Flanders. For an exact answer always look the code up rather than relying on the range.

The 2025 municipality mergers

On 1 January 2025 a number of Flemish municipalities merged, for example Tessenderlo-Ham, Pajottegem and Lokeren with Moerbeke. This changed NIS codes and municipality names, but postcodes did not change. This list uses the 2025 codes. If your data still contains old NIS codes, translate them with the Municipality Merger Mapper.

Typical uses

• Check which postcode belongs to a village before you ship or invoice.
• Match NIS codes from open data and tax documents to municipality names.
• Clean customer addresses before importing them, together with the Flemish address check for street-level validation.
• Convert coordinates for a place with the Lambert 72 converter.

If a place seems to be missing, search without accents or try its sub-municipality name. Very small hamlets share the postcode of a larger village.