Hickory Hills, IL has a population of 13,858 and is the 3,022nd largest city in the United States. The population density is 4,901 per sq mi which is 2105% higher than the Illinois average and 5310% higher than the national average. The median age in Hickory Hills is 39 which is approximately 4% higher than the Illinois average of 37. In Hickory Hills, 59% of the population over 15 years of age are married, 60% speak English and 8% speak Spanish. 65% of Hickory Hills residents were born in Illinois, 8% were born out of state, 2% were born outside of the United States and 25% were foreign born.