The Installation Postal Office (IPO) located in the Directorate of Human Resources (DHR) has overall responsibility for Official Mail Operations and for Personal Mail for Soldiers residing in barracks on Fort Stewart and Hunter Army Airfield. The IPO is the liaison between the military bases and the U.S. Postal Service. The IPO manages the processes and personnel responsible for mail delivery to  Soldiers residing in the barracks, units, and staff offices/directorates. The local U.S. post offices perform mail delivery and pickup within the base housing areas.

Standardized street addressing is used throughout Fort Stewart and Hunter Army Airfield and use of these addresses is necessary to ensure mail delivery. Many street addresses also use suite numbers to further identify a specific delivery point. If a suite number is omitted from an address, the mail may be identified as undeliverable.

Delivery of Mail to Base Housing Areas:  A branch of the Hinesville Post Office furnishes postal service for Fort Stewart. All postal services (with the exception of international money order service) are available at this branch, which is located at 843 Hase Road (Bldg 418), next to the Post Exchange Shoppette. Also, International money order service may be obtained at the Hinesville Post Office located at 744 W. Oglethorpe Highway.

Postal services for Hunter Army Airfield are furnished by the Main Savannah Post Office with the branch post office being located at 37 N. Schmidt Street, Suite 102 (Bldg. 1212). All postal services are available at this branch with the exception of general delivery and international money order service. These services may be obtained at one of the Savannah post offices.