There was a combined around $8 million of land for sale in Oklahoma's Harmon County recently on Land.com. The total of all Harmon County land and rural real estate for sale was around 6,000 acres. Harmon County ranks 77th out of 77 counties in the Sooner State for the total acreage of land currently advertised for sale. Vinson featured the most land for sale. Agriculture and farming drives the Harmon County economy, with 366 farms recorded in the county during the U.S. Census in 2012. Farming activities in Harmon County generate annual revenues of $5 million, most of which is from crops. Harmon County is Oklahoma's 71st largest county (538 square miles). It's located in the Great Plains Country Oklahoma region of the state.