Land for sale in Day County recently totaled approximately $8 million and nearly 1,000 acres. Day County ranks 23rd in the state for the total acreage of land currently advertised for sale. Of all farms and ranches 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 the 28th biggest county (1,091 square miles) in South Dakota. It's located in the Glacial Lakes & Prairies South Dakota region of South Dakota.