The value of all land for sale in Marshall County, South Dakota, recently was almost $18 million, representing a combined 2,755 acres of land for sale in Marshall County. Marshall County ranks 23rd out of 66 counties in South Dakota for the total number of acres of land currently advertised for sale. Of all land and rural real estate for sale in Marshall County, Britton had the most land for sale. Marshall County has a large agricultural economy, with 518 farms recorded in the county during the latest U.S. Census. Farming activities in Marshall County generate annual revenues of $10 million, the majority of which comes from livestock products. Marshall County is the 35th largest county (886 square miles) in South Dakota. It's located in the Glacial Lakes & Prairies South Dakota region of South Dakota.