There are 2 US Post Offices in Wirt County serving a total of 5,507 residents equating to 2,754 residents per post office. It's estimated that approximately 8,790 packages are handled across the 2 county post offices annually. Wirt County is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 5,717, making it the least populous county in West Virginia. Its county seat is Elizabeth. The county was created in 1848 by the Virginia General Assembly and named for U.S. Attorney General and presidential candidate William Wirt. The county is serviced by one high school, Wirt County High School. Wirt County is included in the Parkersburg-Vienna, WV Metropolitan Statistical Area, which is included in the Parkersburg-Marietta-Vienna, WV-OH Combined Statistical Area."