There are 6 US Post Offices in Webster County serving a total of 31,746 residents equating to 5,291 residents per post office. It's estimated that approximately 50,670 packages are handled across the 6 county post offices annually. Webster County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 36,202. Its county seat is Marshfield. The county was organized in 1855 and named for U.S. Senator and U.S. Secretary of State Daniel Webster. Webster County is part of the Springfield, MO Metropolitan Statistical Area."