Ability to have a zip code column, and it to be functional in the maps view

It would be great to be able to utilize only a zip code in a map view.
As part of a check-in form we are creating, we would like to see where, in a map view, the most attendees came from, based upon their zip code. As many cities have multiple zip-code, being able to drill down that data in the map to determine if there is a commonality in the location of a city, etc.

thank you