postal code
US /ˈpoʊ.stəl ˌkoʊd/
UK /ˈpoʊ.stəl ˌkoʊd/

1.
code postal
a series of letters and/or numbers that is added to an address to help the post office sort the mail
:
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Please include your postal code on the form.
Veuillez inclure votre code postal sur le formulaire.
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What's the postal code for this area?
Quel est le code postal de cette zone ?