Land for sale in Johnson County recently totaled approximately $3 million and around 1,000 acres. Johnson County ranks 59th in the state for the total acreage of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Johnson County, Tecumseh featured the most land for sale. Government and state-level services are the main economic drivers in Johnson County. Johnson County is the 90th biggest county (376 square miles) in Nebraska. It's located in the Southeast Nebraska region of the state.