Webster County is a county located in the U.S. state of Missouri. As of the 2020 census, the population was 39,085. 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.

Marshfield is a city in Missouri and the county seat of Webster County, Missouri. As of the 2010 census, the city population was 6,633. As of the 2020 census, Marshfield had a population of 7,458. It is part of the Springfield, Missouri, metropolitan area.