Orland Hills, IL has a population of 7,241 and is the 5,056th largest city in the United States. The population density is 6,324 per sq mi which is 2745% higher than the Illinois average and 6881% higher than the national average. The median age in Orland Hills is 35 which is approximately 7% lower than the Illinois average of 37. In Orland Hills, 59% of the population over 15 years of age are married, 78% speak English and 8% speak Spanish. 75% of Orland Hills residents were born in Illinois, 12% were born out of state, 0% were born outside of the United States and 13% were foreign born.