Buttressing the U.S.-Canada border and including a large swath of Bighorn National Forest, Sheridan County is an area of prairie and tillable land. Indeed, the ancient mineral deposits from glaciers here make the region's soil richly fertile for small grain production. Based on U.S. Census data, over 95 percent of Sheridan County land incorporates farmland. Sheridan County ranks 55th out of 56 counties in Big Sky Country for the total acreage of land currently advertised for sale. Redstone had the most land for sale. Agriculture and farming drives the Sheridan County economy, with 527 farms recorded in the county during the U.S. Census in 2012. Farming activities in Sheridan County generate annual revenues of $7 million, most of which is from crops. Sheridan County is Montana's 41st biggest county (1,704 square miles). It's located in the Missouri River Country Montana region of Montana.