The fields that you need to populate are:
zone_id = zen cart zone id to apply tax to
local_fieldmatch = what field in the order table to base tax on for zip code it would be postcode
local_datamatch = actual data we are matching should relate to local_fieldmatch (ie. "Sacramento", "90001")
local_tax_rate = rate to apply
local_tax_label = Label that will appear in cart checkout
local_tax_shipping = true/false to apply specific tax to shipping
local_tax_class_id = tax class id to apply rate to
I have to admit, this is the kind of situation where I tend to get a bit lazy and pull the data into MSAccess to organize.
I might be able to help you get the data into an sql file to upload once you get it ready to go.
What state is this for?
LadyHLG