Land for sale in Humboldt County, Iowa, recently totaled $4 million and 1,000 acres. Humboldt County ranks 91st in the Hawkeye State for the total number of acres of land currently advertised for sale. Of all ranches, farms, hunting land and other rural land and acreage for sale in Humboldt County, Humboldt featured the most land for sale. Manufacturing and related services are the largest economic sectors in Humboldt County. Humboldt County is Iowa's 85th biggest county (435 square miles). It's located in the Western Iowa region of the state.