Can I renew my expired passport at the Post Office with a passport office?

Yes. You have to fill out a form, include a payment and mail it off. You'll get it back in about a month.so, hope your not in a big hurry! People at post office can tell you which form , etc. They have to check to see if you owe back taxes, are a felon or want to join ISIS in Sudan or something like that. Other than that its smooth sailing.

I think yes