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Postal code distribution — graphical visualization

This visualization shows the distribution of the 6 328 existing French postal codes across all 100 000 possible 5-digit codes.

Graphical distribution of all 6,328 French postal codes — each orange pixel represents an existing postal code
Rows: first 2 digits of the postal code (01 at top, 98 at bottom). Columns: last 3 digits (000 to 990, left to right). Royalty-free image under CC BY 4.0 — moncodepostal.fr ·

Reusing this image

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<a href="https://moncodepostal.fr/en/articles/repartition-codes-postaux-france">
  <img src="https://public.moncodepostal.fr/og-images/distribution-french-postal-codes.png"
       alt="Distribution of French postal codes">
</a>
Source: <a href="https://moncodepostal.fr/en/articles/repartition-codes-postaux-france">moncodepostal.fr</a>
https://public.moncodepostal.fr/og-images/distribution-french-postal-codes.png
https://public.moncodepostal.fr/og-images/distribution-french-postal-codes-dark.png

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What stands out

Zoom on postal code 75015 (Paris 15) in the grid — illustrating the xx000 vertical line and the municipal arrondissements

Every code ending in 000 exists:

Except Paris (75), Bouches-du-Rhône (13) and Rhône (69), which start at 75001, 13001 (Marseille) and 69001 (Lyon) instead. You can see these are their arrondissements (the three horizontal bars on the left). Another exception: 97000 and 96000 don't exist.

Zoom on a slice of the French postal-code grid — illustrating the vertical columns formed by codes ending in 0

87 % of postal codes end in 0, which explains the many vertical lines in the visualization — one for each tens digit.

Exception: there's no vertical line between xx010 and xx090 — for most departments, the first postal code is xx000 and the next jumps to xx100, then xx110, etc. A second exception: almost no postal code ends in 900.

Horizontal lines are departments where many postal codes don't end in 0: Bouches-du-Rhône, Corse (codes starting with 20), Nord (the department with the most postal codes), and outre-mer (prefixes 97 and 98).

See also