There was a combined almost $16 million of farms, ranches, and rural real estate for sale in Greer County recently on Land.com. The total acreage of all Greer County farms, ranches, hunting land and other land for sale was almost 5,000 acres. Greer County ranks 63rd in the Sooner State for the total acreage of land currently advertised for sale. Mangum had the most land for sale. From an economic perspective, government and state-level services contribute most to Greer County's overall GDP. Greer County is Oklahoma's 59th biggest county (643 square miles). It's located in the Great Plains Country Oklahoma region of Oklahoma.