Seneca County is in Northwest Ohio. Of the 88 counties in the Buckeye State, Seneca County is 22nd in terms of its size (552 square miles). Seneca County, Ohio, has approximately 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was almost $4 million. The average price of residential land for sale in Seneca County was $243,044. Browse all residential land and rural property for sale in Ohio to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.