There are 11 US Post Offices in Mcnairy County serving a total of 29,846 residents equating to 2,713 residents per post office. It's estimated that approximately 47,638 packages are handled across the 11 county post offices annually. McNairy County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 26,075. Its county seat is Selmer. McNairy County is located along Tennessee's border with the state of Mississippi. Sheriff Buford Pusser, whose story was told in the Walking Tall series of movies, was the sheriff of McNairy County from 1964 to 1970. McNairy County is the location of the Coon Creek Science Center, a notable fossil site that preserves Late Cretaceous marine shells and vertebrate remains (such as mosasaurs)."