Only works on ZIP CODES not postal codes...Bandplan needs to be set to USA
From the help guide
This (location import) screen will only appear if all of the following are true:
The Location Select option on the advanced features tab is set to On
The library frequency database has been updated to version 84 or later
The location database files have been installed on the computer (these should have been installed along with the update)
The default band plan on the General Settings page has been set to USA.
If the above is true, when the Library Import tab is selected, the Set Location screen will be shown. This screen allows frequencies to be imported using a county, city, or zip code and selecting the service types that are to be imported. When enabled, scan lists 151 through 200 will be reserved for the imported data. Items imported will be placed into scan lists based on the selected services.