The details section does not always display the zip code associated with the address even though the record has a zip code associated with it that can be seen in list view by adding the zip code column. If it's possible to force the zip code to view in the details view that would be preferred. We were a bit concerned that we may have had a system dealbreaker here if the zipcode was not actually associated with the organization address.
The zip code should be visible for easy reference in details view. Not only for routing reference, etc. but it is very common that clients will have different tax rates based on zip code so if that info was not available for cross reference into another platform that would be very bad.