Yes, you should be able to do that.
Edit the form XML and add an “instance” line that references the name of the table. You can place this above any existing instance tags in your form.
<instance id="zipcodes" src="jr://fixture/item-list:zipcodes"></instance>
You can then reference the lookup table in xpath expressions as
instance('zipcodes'). Your display condition would then probably look something like this:
Working with lookup tables and itemsets is pretty tricky, so I’d make judicious use of the Evaluate XPath utility in trying to make this work.