There was a combined around $192 million of farms, ranches, and rural real estate for sale in Union County, Ohio, recently on Land.com. The total acreage of all Union County farms, ranches, and rural real estate for sale was around 2,000 acres. Union County ranks 36th out of 88 counties in the Buckeye State for the total acreage of land currently advertised for sale. Of all locations in Union County with farms, ranches, hunting land and other land for sale, Marysville had the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Union County. Union County is the 49th biggest county (436 square miles) in Ohio. It's located in the Central Ohio region of the state.