There are 9 US Post Offices in Jackson County serving a total of 26,521 residents equating to 2,947 residents per post office. It's estimated that approximately 42,330 packages are handled across the 9 county post offices annually. Jackson County is a county located in the southwestern corner of the U.S. state of Oklahoma. As of the 2010 census, the population was 26,446. Its county seat is Altus. According to the Encyclopedia of Oklahoma History and Culture, the county was named for two historical figures: President Andrew Jackson and Confederate General Stonewall Jackson. One source states only that the county was named for the former President, while an earlier source states it was only named for General Stonewall Jackson. Jackson County comprises the Altus, OK Micropolitan Statistical Area."