There are 9 US Post Offices in Lauderdale County serving a total of 82,446 residents equating to 9,161 residents per post office. It's estimated that approximately 131,593 packages are handled across the 9 county post offices annually. Lauderdale County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 80,261. The county seat is Meridian. The county is named for Colonel James Lauderdale, who was killed at the Battle of New Orleans in the War of 1812. Lauderdale County is included in the Meridian, MS Micropolitan Statistical Area."