There are 19 US Post Offices in Benton County serving a total of 179,095 residents equating to 9,426 residents per post office. It's estimated that approximately 285,856 packages are handled across the 19 county post offices annually. Benton County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 221,339, making it the second-most populous county in Arkansas. The county seat is Bentonville. The county was formed on 30 September 1836 and was named after Thomas Hart Benton, a U.S. Senator from Missouri. In 2012, Benton County voters elected to make the county wet, or a non-alcohol prohibition location. Benton County is part of the Fayetteville\u2013Springdale\u2013Rogers, AR-MO Metropolitan Statistical Area."