The value of all farms and ranches for sale in Day County, South Dakota, recently was nearly $5 million, representing a combined 647 acres of land for sale in Day County. Day County ranks 20th in the Mount Rushmore State for the total number of acres of land currently advertised for sale. Of all land for sale in Day County, Webster featured the most land for sale. Day County has a large agricultural economy, with 693 farms recorded in the county during the latest U.S. Census. Farming activities in Day County generate annual revenues of $9 million, most of which is from crops. Day County is South Dakota's 28th largest county (1,091 square miles). It's located in the Glacial Lakes & Prairies South Dakota region of South Dakota.