Fort Totten is a census-designated place in Benson County, North Dakota, United States. The population was 1,243 at the 2010 census. Fort Totten is located within the Spirit Lake Reservation and is the site of tribal headquarters. The reservation has a total population estimated at 6,000. Although not formally incorporated as a city, Fort Totten has the largeā¦Fort Totten is a census-designated place in Benson County, North Dakota, United States. The population was 1,243 at the 2010 census. Fort Totten is located within the Spirit Lake Reservation and is the site of tribal headquarters. The reservation has a total population estimated at 6,000. Although not formally incorporated as a city, Fort Totten has the largest population of any community in Benson County.