PO
OK is the abbreviation used.
Post Office!!
GPO
MO i believe is the abbreviation that you are looking for.
Post Office!!
It is represented by the letters: FL
P.O. Box 785
Fleet Post Office
A period .
The preferred abbreviation by the United States Postal Service is: PO BOX 785
The meaning of the abbreviation APO in West Virginia is Army Post Office or Air Force Post Office. This allows members of the military to receive their mail when overseas.