Land for sale in Clay County, Nebraska, recently totaled almost $5 million and nearly 1,000 acres. Clay County ranks 53rd out of 93 counties in the Beef State for the total acreage of land currently advertised for sale. Glenvil had the most land for sale. Clay County has a large agricultural economy, with 457 farms recorded in the county during the latest U.S. Census. Farming activities in Clay County generate annual revenues of $12 million, most of which is from crops. Clay County is Nebraska's 60th biggest county (573 square miles). It's located in the Southeast Nebraska region of Nebraska.