The value of all farms and ranches for sale in Osage County, Oklahoma, recently was almost $100 million, representing a total of 9,951 acres of land for sale in Osage County. Osage County ranks 20th out of 77 counties in the Cowboy Country for the total acreage of land currently advertised for sale. Among cities in Osage County with land and rural real estate for sale, Skiatook had the most land for sale. Mining and mineral extraction-related services are the main economic drivers in this part of Oklahoma. Osage County is the largest county in Oklahoma (2,303 square miles). It's located in the Green Country Oklahoma region of the state.