Land for sale in Cassia County, Idaho, recently totaled almost $39 million and nearly 5,000 acres. Cassia County ranks 29th out of 44 counties in the Gem State for the total acreage of land currently advertised for sale. Among cities in Cassia County with land for sale, Burley had the most land for sale. Its economy is defined as agricultural, with 668 farms recorded in the county during the most recent 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 Idaho.