There are 5 US Post Offices in Tyler County serving a total of 7,781 residents equating to 1,556 residents per post office. It's estimated that approximately 12,419 packages are handled across the 5 county post offices annually. Tyler County is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 9,208. Its county seat is Middlebourne. The county was founded in 1814 and is named after John Tyler, Sr., father of President John Tyler."