Calculated contours of postal code areas

Unlike in the United States, postal codes do not allow for a geographical division of the country.
The same postal code can be used for addresses in several municipalities, and a municipality may have addresses with different postal codes.
For more information, see article on Wikipedia.

Very exceptionally, it may be useful to have contours, especially when a procedure is built exclusively on the entry of a postal code.

This dataset contains a polygon by postal code significantly used in the National Address Base.
Each polygon is a simple convex envelope around addresses using the same postal code.
The polygons overlap quite widely.

Two attributes are proposed: ‘Codepostal’ and ‘nbNumeros’ (number of addresses attached in the BAN).