science

NIS code

NIS code is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NIS code rather than just read about it. In short: The NIS code (Dutch: NIS-code, French: code INS) is a numeric code for regional areas of Belgium. This code is used for statistical data treatment in Belgium.

Key takeaways

NIS code belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NIS code to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NIS code from memory before moving on to harder problems.

Reference excerpt

The NIS code (Dutch: NIS-code, French: code INS) is a numeric code for regional areas of Belgium. This code is used for statistical data treatment in Belgium. This code was developed mid-1960s by the Statistics Belgium. It was first used for the census of 1970.

Structure of the code The NIS code consists of 5 digits:

The first number identifies the province. if this digit is followed by 4 zeroes, this code identifies the complete province. Example: 70000 identifies the province Limburg. The second digit identifies the arrondissement within this province. If after the two first digits there are three zeroes, then this code identifies the complete arrondissement. Example: 71000 identifies the arrondissement of Hasselt. The last three digits uniquely identify the municipality within that arrondissement. Example: 71066 identifies Zonhoven.

Special cases The country Belgium received the code 01000. The three regions received the codes 02000 for Flanders, 03000 for Wallonia and 04000 for the Brussels region. In 1995 the province of Brabant with first digit 2 was split in Flemish Brabant and Walloon Brabant. Flemish Brabant received code 20001 and Walloon Brabant received code 20002. The arrondissements kept their old codes. The provinces and municipalities of Brussels are sorted alphabetically on their French name.

Mergers municipalities that were merged and received a new name also received a new NIS code, which followed the last number of the list of municipalities of that arrondissement. municipalities that lost their independence by merger and became municipality parts, also lost their NIS code. Per merged municipality only 1 NIS code remained. At the same time the structure of the NIS sector was adapted. An alphabetic letter was added per municipality part to be able to uniquely identify such a municipality part. The Arrondissement of Brussels-Periphery with code 22000 merging in 1971 with the arrondissement of Halle-Vilvoorde, also lost its code by merger. The municipalities within this arrondissement received a new NIS code.

Examples 40000: Province East Flanders

4 Province East Flanders 0000 This code identifies the complete province 32000: Arrondissement of Diksmuide

3 Province West Flanders 2 Arrondissement of Diksmuide 000 This code identifies the complete arrondissement 73032: municipality Hoeselt

7 Province Limburg 3 Arrondissement of Tongeren 032 municipality Hoeselt 61012: municipality Clavier

6 Province Liège 1 Arrondissement of Huy 012 municipality Clavier 23105: municipality Affligem

23 Arrondissement of Halle-Vilvoorde 105 municipality Affligem (new name of this municipality, resulting in the number no longer corresponding with the alphabetic order) 71022E: municipality part Stokrooie

7 Province Limburg 1 Arrondissement of Hasselt 022 Merged municipality Hasselt E municipality part Stokrooie, which had the code 71056 before the merger.

External links List of all NIS codes (2025) Wikidata list with NIS-codes

Illustrations

Worked examples

Example 1 — a first encounter with NIS code

Start with the simplest possible case. Write down what NIS code claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NIS code before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NIS code ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NIS code

In research: NIS code appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses NIS code in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: NIS code is common in secondary-school and first-year university syllabi. It links to neighbouring topics Encodings, Government of Belgium, so understanding it makes those chapters shorter.
In everyday life: Look for NIS code outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study NIS code in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NIS code means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NIS code out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NIS code in simple terms?

The NIS code (Dutch: NIS-code, French: code INS) is a numeric code for regional areas of Belgium. This code is used for statistical data treatment in Belgium.

Why does NIS code matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NIS code?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NIS code.