There are 3 US Post Offices in Alcorn County serving a total of 36,277 residents equating to 12,092 residents per post office. It's estimated that approximately 57,902 packages are handled across the 3 county post offices annually. Alcorn County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 37,057. Its county seat is Corinth. The county is named in honor of Governor James L. Alcorn. The Corinth Micropolitan Statistical Area includes all of Alcorn County."