What's the easiest way to find out which city belongs to which county, knowing the zip code & area code (tel)?

What's the easiest way to find out which city belongs to which county, knowing the zip code %26amp; area code (tel)?

Note that I have many cities to look up. If it is a map, it needs to be very clear. Thanks.What's the easiest way to find out which city belongs to which county, knowing the zip code %26amp; area code (tel)?
This web site will give you the county for any zip code:

http://www.zipinfo.com/search/zipcode.ht鈥?/a>

estee lauder