There are 5 US Post Offices in Cross County serving a total of 17,752 residents equating to 3,550 residents per post office. It's estimated that approximately 28,334 packages are handled across the 5 county post offices annually. Cross County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 17,870. The county seat is Wynne. Cross County is Arkansas's 53rd county, formed on 15 November 1862 and named for Confederate Colonel David C. Cross, a political leader in the area."