Clifton, ID has a population of 415 and is the 20,681st largest city in the United States. The population density is 181 per sq mi which is 846% higher than the Idaho average and 99% higher than the national average. The median age in Clifton is 22 which is approximately 40% lower than the Idaho average of 36. In Clifton, 70% of the population over 15 years of age are married, 92% speak English and 6% speak Spanish. 44% of Clifton residents were born in Idaho, 55% were born out of state, 0% were born outside of the United States and 1% were foreign born.