CLDR 27 Release Note states:
==== For supplemental data
Deprecated the *<postalCodeData>* element and its *<postCodeRegex>* subelement. The data was not being maintained and there are other sources of such information that are kept up to date.
There are a few mentions of postal codes on the cldr.unicode.org site that should probably by removed.
==== What is CLDR?
_*Country information:*_ language usage, currency information, calendar preference and week conventions, postal and telephone codes
==== Country information:
postal codes and telephone codes