Think about it... "How many times have you had the need to verify a zip code for a street?"
I recommend that MAPS add additional layers to "Satellite and Traffic” => Map Type
i.e.,
1. "Town Boundary"
2. "Town Boundary with Zip Code Boundaries overlays
In Westchester County, (New York, USA) Zip Code boundaries are not co-terminus with town boundaries and I believe it is pretty much the samy all over the country.
These layers are very useful for the general population seeking to purchase a property, professionals such researchers, marketers, social and physical anthropologists, economists, students of water quality, etc., etc.
Please advise if you need further clarification.
NOTE:
I requested this feature in Feedback and festure requests.