You are required to charge sales tax on goods you sell online to anyone in a state in which you have a physical location. If you omit the zip code in your rule, the rule will be applied to the entire state. If you have a state rule and a zip code rule that apply to a user, both taxes will be applied. This allows you to create State Tax and an additional Municipal Tax for specific zip codes.
From the main menu, choose "Settings" and click on "Taxes"
Click the "Create New Tax Rule" button, and choose a name for your tax rule.
From the drop down box, choose your state.
Choose whether or not to tax shipping costs, and save your rule.