The United States Postal Service has released its “closure list” but it’s copyrighted and I am not allowed to post it 😦 However, I can report that no post offices in the Greater Pottstown area are on the list.
Fourteen post offices in Philadelphia are on the list and a Wayne location. Those were the only 19xxx zip codes.
Most of the locations are small offices in Central, Northern or Western Pennsylvania. There are a few exceptions but mostly more rural areas.
Here is a link to the list but it appears to be in no particular order. I copy pasted into Excel and sorted by zip code or alphabetically to make it easier!