
Island Lake
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 3.349
- State:
- Illinois
Island Lake is a village located in Lake County, Illinois. Island Lake has a 2025 population of 7,964. Island Lake is currently declining at a rate of -0.18% annually and its population has decreased by -0.86% since the most recent census, which recorded a population of 8,033 in 2020.
The average household income in Island Lake is $110,705 with a poverty rate of 6.54%. The median age in Island Lake is 39.5 years: 40 years for males, and 37.9 years for females.