There are 13 US Post Offices in Phillips County serving a total of 22,036 residents equating to 1,695 residents per post office. It's estimated that approximately 35,172 packages are handled across the 13 county post offices annually. Phillips County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 21,757. The county seat is Helena-West Helena. Phillips County is Arkansas's seventh county, formed on May 1, 1820, and named for Sylvanus Phillips, the area's first-known white settler and representative to the first Territorial Legislature of the Arkansas Territory. 237 people were lynched there in 1919 during the Elaine race riot, making Phillips County the site of the largest number of lynchings in U.S. history. The Helena-West Helena, AR Micropolitan Statistical Area includes all of Phillips County."