There are 7 US Post Offices in Dyer County serving a total of 37,263 residents equating to 5,323 residents per post office. It's estimated that approximately 59,476 packages are handled across the 7 county post offices annually. Dyer County is a county located in the westernmost part of the U.S. state of Tennessee. As of the 2010 census, the population was 38,335. Its county seat is Dyersburg. Dyer County comprises the Dyersburg, TN Micropolitan Statistical Area."