Barrington Hills, IL has a population of 3,574 and is the 7,949th largest city in the United States. The population density is 132 per sq mi which is 41% lower than the Illinois average and 46% higher than the national average. The median age in Barrington Hills is 55 which is approximately 47% higher than the Illinois average of 37. In Barrington Hills, 69% of the population over 15 years of age are married, 81% speak English and 3% speak Spanish. 55% of Barrington Hills residents were born in Illinois, 29% were born out of state, 0% were born outside of the United States and 16% were foreign born.