I’d like to see a list - while I think this has to be done I do understand the comment.
When you live in Podunk, Ohio but your post office requires people to put “East Boofoo” when they mail to you, your actual town gets lost in the shuffle.
You can have your mail read “Podunk East” and still have the post office in “Bigburg”. They sort and bag the mail in Bigburg and drive to Podunk East to do the route. A little more in terms of gas money, and you still have the same number of route workers, but you lose the facility and management cost.