There are 10 US Post Offices in Benson County serving a total of 6,324 residents equating to 632 residents per post office. It's estimated that approximately 10,094 packages are handled across the 10 county post offices annually. Benson County is a county located in the U.S. state of North Dakota. As of the 2010 census, the population was 6,660. Its county seat is Minnewaukan. The county was created by the 1879 territorial legislature and named for B.W. Benson, a Dakota Territory legislator at the time. The county government was first organized on June 4, 1884. Sullys Hill National Game Preserve and much of the Spirit Lake Indian Reservation are located within the county."