Land for sale in Dunn County recently totaled nearly $5 million and 2,000 acres. Dunn County ranks 20th out of 53 counties in the state for the combined amount of land currently advertised for sale. Of all locations in Dunn County with farms, ranches, hunting land and other land for sale, Dickinson had the most land for sale. Dunn County is one of the ten largest counties in North Dakota (2,082 square miles). It's located in the West North Dakota region of the state.