Calendar Sort by Zip Code

How would I sort a months worth of appointments by the zip code of the
contact assigned to the appointment? Even though the sort field (Zip
Code) is available to select as a sort criteria, it does not work nor
does a zip code display if the field (Zip Code) is added to the fields
in a calendar view (table format.) Are the only useable fields in a
Calendar view the fields available in an individual appointment?

Dan