You can now specify a different tax amount for each zip code in a state.
In the Mals-E Cart Setup, select 'Sales Tax' under 'Tax and shipping'
Under Tax Basis- select Tax will be calculated using one of the rates specified below
Choose Option #6
Select your state from the drop down box, and enter Z under '% Rate'.
Mals will automatically determine the county tax rate based on whatever zip code the customer enters, and apply the appropriate tax.