There was a combined $40 million of land for sale in Cassia County, Idaho, recently on Land.com. The total size of all Cassia County farms, ranches, hunting land and other land for sale was almost 6,000 acres. Cassia County ranks 37th in Idaho for the total acreage of land currently advertised for sale. Burley had the most land for sale. Cassia County has a large agricultural economy, with 668 farms recorded in the county during the latest U.S. Census. Farming activities in Cassia County generate annual revenues of $20 million, the majority of which comes from livestock products. Cassia County is one of the ten biggest counties in Idaho (2,580 square miles). It's located in the South Central Idaho region of the state.