There are 12 US Post Offices in Washington County serving a total of 16,463 residents equating to 1,372 residents per post office. It's estimated that approximately 26,277 packages are handled across the 12 county post offices annually. Washington County is a county in the U.S. state of Alabama. As of the 2010 census, the population was 17,581. The county seat is Chatom. The county was named in honor of George Washington, the first President of the United States. It is a dry county, with the exception of Chatom."