Land for sale in Ross County, Ohio, recently totaled nearly $38 million and almost 2,000 acres. Ross County ranks 37th out of 88 counties in the Buckeye State for the combined amount of land currently advertised for sale. Chillicothe featured the most land for sale. Government and state-level services are the main economic drivers in Ross County. Ross County is one of the ten biggest counties in Ohio (693 square miles). It's located in the Southeast Ohio region of Ohio.