Germantown Hills, IL has a population of 3,491 and is the 8,059th largest city in the United States. The population density is 2,235 per sq mi which is 905% higher than the Illinois average and 2367% higher than the national average. The median age in Germantown Hills is 41 which is approximately 8% higher than the Illinois average of 37. In Germantown Hills, 78% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 75% of Germantown Hills residents were born in Illinois, 22% were born out of state, 0% were born outside of the United States and 4% were foreign born.