You will need to install a user script manager extension to install this script.
For use in Waze Map Editor (WME)
Currently only displays approximate ZIP code "tabulation areas"*. The zip code at the center of the map view will be displayed in the black header bar. Click the ZIP code there to open a USPS ZIP code-to-city conversion web page.
*ZIP codes don't have true boundaries. See the following for more information on "tabulation areas":