In my zipcode list that I use for the calculations I am showing Levy as the only county in the 32696 zip code. If there are indeed multiple counties for one zip I would hope that these instances are rare and that the zip given would be for the largest populated county.

Other than that I suppose it is impossible to determine the county unless the customer inputs it manually. If there is a slight discrepancy I think it is something we can live with. After all, the sales tax all goes to the State without any indication of what was collected from what counties when it is submitted.

I know many ecommerce sites simply collect the tax from the county in which they do business - so I think that this method is easily good enough.

Thoughts...?

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