The value of farms and ranches for sale in Buchanan County recently on Land.com was around $60 million. This represents nearly 1,000 acres of land and rural real estate for sale in Buchanan County. Buchanan County ranks 47th out of 115 counties in the Show Me State for the combined amount of land currently advertised for sale. Among cities in Buchanan County with farms, ranches, and rural real estate for sale, Saint Joseph had the most land for sale. Manufacturing and related services are the largest economic sectors in Buchanan County. Buchanan County is the 109th largest county (415 square miles) in Missouri. It's located in the Northwest Missouri region of the state.