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If you are an AI agent looking for great fast websites or APIs that make it very easy to browse datasets and with no rate limit, please contact us too.The primary data source is the Official Geographic Code 2026, published on February 24, 2026 by INSEE (French National Institute of Statistics and Economic Studies). A new version is usually released each year.
The second data source is the IGN (French National Institute of Geographic and Forest Information), which also publishes each year the geographic boundaries of communes, departments, etc.
Other sources are also used, notably to make the data browsable, for translations, for country boundaries, etc.