yes I do have all the zip codes in a list that I could put it in any format that is needed
So does this list have like 90210 = yes, 90645 = no or how is it determined that the zip code is a serviceable area?
A further thought. If you have a fixed list of zip codes that aren't in a table, i.e., they're just a list you keep manually, then you could do the whole thing in a 5-line jQuery program. Just check if the entered value is in the list and you're done.
You are on the right track. I would do a single line number field (set it as a lookup) that watches the zipcodes that you allow. Then create the logic to show the remainder for the form if it finds a zip code you allow. Should be pretty straight forward.
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How do you know on your end if the zip code is within your service area? Do you have a list of zipcodes you serve or do you have a list of town/city names or what?
yes I do Have a list of zip codes