There are 10 US Post Offices in Arkansas County serving a total of 19,777 residents equating to 1,978 residents per post office. It's estimated that approximately 31,566 packages are handled across the 10 county post offices annually. Arkansas County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 19,019. The county has two county seats, De Witt and Stuttgart. The first of the state's 75 present-day counties to be created, Arkansas County was formed on December 13, 1813, when this area was part of the Missouri Territory, and is named after the Arkansas Indian tribe. Arkansas County is one of seven current-day counties in the United States to share the same name as the state they are located in (the other six counties are Hawaii County, Idaho County, Iowa County, New York County, Oklahoma County, and Utah County)."