There are 12 US Post Offices in Wood County serving a total of 146,151 residents equating to 12,179 residents per post office. It's estimated that approximately 233,273 packages are handled across the 12 county post offices annually. Wood County is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 86,956, making it the fifth-most populous county in West Virginia. Its county seat is Parkersburg. The county was formed in 1798 from the western part of Harrison County and it was named for James Wood, governor of Virginia from 1796 to 1799. Wood County is included in the Parkersburg-Vienna, WV Metropolitan Statistical Area, which is included in the Parkersburg-Marietta-Vienna, WV-OH Combined Statistical Area."