This is a project based on a tutorial to create a simple data map using D3.js JavaScript library.
The expected result should look like this.
With code available here.
More information can be found in others sources such as:
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Répertoire officiel des localités avec le code postal et le périmètre
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List of postcodes of Switzerland aka PLZ-Verzeichnis via Open Data Portal of Swiss Post
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Data about municipalities can be found here