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Marshall County is a county located in the state of South Dakota. Based on the 2010 census, the population was 4,656. Its county seat is Britton. The county is named after Marshall Vincent, who homesteaded near Andover, South Dakota
Marshall is named for prominent county resident Marshall Vincent.
County QuickFacts: CensusBureau Quick Facts
Marshall County was organized in March 1885 and originally included a good portion of Day County. The division of Day County was put to a vote in 1885. An election in July 1885 resulted in election of officers and naming Britton as the county seat. The county was named in honor of Marshall Vincent, one of the area's foremost citizens and a county commissioner.
As reported by the Census Bureau, the county has a total area of 886 square miles (2,294 km2), of which, 838
square miles (2,170 km2) of it is land and 48 square miles (124 km2) of it is water. The total area is 5.41% water.
Bordering counties are as follows: