The Contact Delete process in Marketing Cloud removes contact data from the contact model but does not remove records from the data extensions themselves.
* Contact Delete Process: When you perform a Contact Delete in Contact Builder, it removes the contact data from the contact model but leaves the actual rows in the data extensions intact.

To append the subscriber's zip code to a link and ensure that the clicks are tracked, you should use theLookup function to retrieve the zip code from the data extension and theRedirectTofunction to create the link with tracking enabled.
* Lookup: Retrieves the zip code from the data extension.
* RedirectTo: Ensures that the link with the appended zip code is tracked.
* Example:
ampscript
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%%[
SET @zipcode = Lookup("DataExtensionName", "zipcode", "SubscriberKey", _subscriberkey) SET @link = Concat("http://example.com?zip=", @zipcode) ]%%
<a href="%%=RedirectTo(@link)=%%">Click Here</a>