The value of all land and rural real estate for sale in Harmon County recently was $8 million, representing a combined 5,068 acres of land for sale in Harmon County. Harmon County ranks 77th in the Sooner State for the combined amount of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Harmon County, Vinson had 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 biggest county (538 square miles). It's located in the Great Plains Country Oklahoma region of Oklahoma.