PrestaShop 1.6.x. How to change ZIP/postal code format

By default ZIP/postal code format isn’t verified in Prestashop, i.e. site visitor can enter the ZIP code in any format.

1. In your PrestaShop admin panel go to Localization -> Countries section: 
2. Find the country you need to edit ZIP/postal code format for. Click the Edit button: 
3. Insert the format into the ZIP/postal code format field:  LLNNNN will require code with 2 letters first and four numbers following them.
4. Save the changes and check the ZIP/postal code format in the corresponding field at the front end.

Hopefully, this tutorial was helpful for you.