Heritage Lake, IL has a population of 1,482 and is the 12,760th largest city in the United States. The population density is 1,305 per sq mi which is 487% higher than the Illinois average and 1341% higher than the national average. The median age in Heritage Lake is 37 which is approximately 1% lower than the Illinois average of 37. In Heritage Lake, 71% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 90% of Heritage Lake residents were born in Illinois, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.