Google is now showing you zip code listings for locations you enter into Google. So you can ask Google to show you the zip codes for [orlando, florida zip codes]. If there are more than one result, Google will show a carousel of information with the zip codes:
Now, if you want to see the zip code area on a map, just click on one of the zip codes and Google will outline on the map on the right, the zip code area directly on the map.
I believe this feature was available directly in Google Maps before but not in Google search results.
Google confirmed this is all new in the Google search results.
Of course, this may put some zip code web sites out of business.
Forum discussion at Google+.