There was a total of $16 million of land for sale in North Dakota's Williams County recently on Land.com. The total acreage of all Williams County farms, ranches, and rural real estate for sale was around 1,000 acres. Williams County ranks fifth out of 53 counties in the Rough Rider State for the total acreage of land currently advertised for sale. Williston featured the most land for sale. Williams County is one of the ten biggest counties in North Dakota (2,148 square miles). It's located in the West North Dakota region of the state.