Fort Hall, ID has a population of 3,617 and is the 7,892nd largest city in the United States. The population density is 103 per sq mi which is 441% higher than the Idaho average and 14% higher than the national average. The median age in Fort Hall is 35 which is approximately 1% lower than the Idaho average of 36. In Fort Hall, 45% of the population over 15 years of age are married, 82% speak English and 3% speak Spanish. 76% of Fort Hall residents were born in Idaho, 21% were born out of state, 1% were born outside of the United States and 2% were foreign born.