Long Lake, IL has a population of 3,564 and is the 7,963rd largest city in the United States. The population density is 3,533 per sq mi which is 1489% higher than the Illinois average and 3800% higher than the national average. The median age in Long Lake is 39 which is approximately 3% higher than the Illinois average of 37. In Long Lake, 60% of the population over 15 years of age are married, 81% speak English and 14% speak Spanish. 71% of Long Lake residents were born in Illinois, 13% were born out of state, 4% were born outside of the United States and 12% were foreign born.