There was a combined almost $7 million of farms and ranches for sale in Seneca County recently on Land.com. The total acreage of all Seneca County ranches, farms, hunting land and other rural land and acreage for sale was nearly 1,000 acres. Seneca County ranks 76th in the Buckeye State for the combined amount of land currently advertised for sale. Of all locations in Seneca County with land for sale, Tiffin featured the most land for sale. Seneca County is Ohio's 22nd largest county (552 square miles). It's located in the Northwest Ohio region of the state.