There are 12 US Post Offices in Monongalia County serving a total of 114,859 residents equating to 9,572 residents per post office. It's estimated that approximately 183,328 packages are handled across the 12 county post offices annually. Monongalia County, known locally as Mon County, is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 96,189, making it the third-most populous county in West Virginia. Its county seat is at Morgantown. The county was founded in 1776. Monongalia County is included in the Morgantown, WV Metropolitan Statistical Area, and is the largest county in North-Central West Virginia. It is defined entirely as part of the Pittsburgh media market."