There are 6 US Post Offices in Franklin County serving a total of 18,299 residents equating to 3,050 residents per post office. It's estimated that approximately 29,207 packages are handled across the 6 county post offices annually. Franklin County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 18,125. The county has two county seats, Charleston and Ozark. The county was formed on December 19, 1837, and named for Benjamin Franklin, American statesman. To the north of the Arkansas River, which bisects Franklin County, the county is wet and alcohol is sold in liquor stores, bars and local vineyards. To the south of the Arkansas River, the county is dry."