There are 12 US Post Offices in Lawrence County serving a total of 15,808 residents equating to 1,317 residents per post office. It's estimated that approximately 25,231 packages are handled across the 12 county post offices annually. Lawrence County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 17,415. The county seat is Walnut Ridge. Lawrence County is Arkansas's second county, formed on January 15, 1815, and named for Captain James Lawrence who fought in the War of 1812. It is an alcohol prohibition or dry county."