Fort Duchesne, UT has a population of 699 and is the 17,491st largest city in the United States. The population density is 100 per sq mi which is 196% higher than the Utah average and 10% higher than the national average. The median age in Fort Duchesne is 23 which is approximately 25% lower than the Utah average of 30. In Fort Duchesne, 25% of the population over 15 years of age are married, 13% speak English and 0% speak Spanish. 83% of Fort Duchesne residents were born in Utah, 14% were born out of state, 0% were born outside of the United States and 2% were foreign born.