Land for sale in Henderson County recently totaled almost $2 million and approximately 1,000 acres. Henderson County ranks 76th out of 102 counties in the state for the combined amount of land currently advertised for sale. Among cities in Henderson County with farms and rural real estate for sale, Oquawka featured the most land for sale. Henderson County has a large agricultural economy, with 396 farms recorded in the county during the latest U.S. Census. Farming activities in Henderson County generate annual revenues of $7 million, most of which is from crops. Henderson County is Illinois's 76th largest county (395 square miles). It's located in the Western Illinois region of Illinois.