A total of approximately 2,000 acres were listed for sale in Union County, Ohio, recently; the combined value of all Union County farms and ranches for sale was around $190 million. Union County ranks 39th out of 88 counties in the state for the total number of acres of land currently advertised for sale. Of all land for sale in Union County, Marysville featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Union County. Union County is Ohio's 49th largest county (436 square miles). It's located in the Central Ohio region of the state.