There are 6 US Post Offices in Webster County serving a total of 11,371 residents equating to 1,895 residents per post office. It's estimated that approximately 18,149 packages are handled across the 6 county post offices annually. Webster County is a county located in the U.S. state of Mississippi. As of the 2010 census, the population was 10,253. Its county seat is Walthall. The county is named after statesman Daniel Webster."