Selfridge Public School is an American elementary school and high school located in Selfridge, North Dakota. The athletic teams are known as the "Chieftains".Selfridge Public School District is a school district of the publicly-funded school serving the cites of Selfridge and Fort Yates, and the village of Porcupine, and the surrounding rural areas. District administration offices are in Selfridge. It has the largest land area of any other school district in Sioux County. Selfridge is a city in Sioux County, North Dakota in the United States and on the Standing Rock Indian Reservation. Selfridge was founded in 1911. The population was 160 at the 2010 census. Sub-Divisions near this city include Chadwick, ND and Porcupine, North Dakota.