Clifton, IL has a population of 1,475 and is the 12,786th largest city in the United States. The population density is 1,675 per sq mi which is 653% higher than the Illinois average and 1749% higher than the national average. The median age in Clifton is 33 which is approximately 13% lower than the Illinois average of 37. In Clifton, 58% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 91% of Clifton residents were born in Illinois, 8% were born out of state, 1% were born outside of the United States and 0% were foreign born.