You may have seen a button when creating your County tax to 'Add Unincorporated Places Tax Rate'.
Unincorporated places are any part of a county that doesn't belong a city, but needs to charge a specific tax rate for these areas.
Setting an Incorporated Places Tax Rate will create a Special Tax Zone in your Taxes for each area within a county that doesn't have a city.
For example, here's the outline for Atlantic County
Now here's the Unincorporated Tax Area for Atlantic County. Note that it has 'bites' taken out of it where the cities are.