Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ozark County is a county located in South Central Missouri in the United States. As of the 2000 U.S. Census, the county''s population was 9,542. A 2008 estimate, however, showed the population to be 9,227. The largest city and county seat is Gainesville. From 1843 to 1845 the county was called Decatur County, after Commodore Stephen Decatur. The county was eventually renamed to Ozark County after the Ozark Mountains and was officially organized on January 29, 1841.