There are 12 US Post Offices in Ozark County serving a total of 7,625 residents equating to 635 residents per post office. It's estimated that approximately 12,170 packages are handled across the 12 county post offices annually. Ozark County is a county located in the southern portion of the U.S. state of Missouri. As of the 2010 census, the population was 9,723. The largest city and county seat is Gainesville. The county was organized as Ozark County, named after the Ozark Mountains, on January 29, 1841. It was renamed Decatur County, after Commodore Stephen Decatur, from 1843 to 1845, after which the name Ozark County was restored."