
Lake Forest
- County:
- Lake County
- County Seat:
- No
- Area (mi²):
- 17.201
- State:
- Illinois
Lake Forest is a city located in Lake County, Illinois. Lake Forest has a 2025 population of 19,360. Lake Forest is currently growing at a rate of 0.02% annually and its population has increased by 0.08% since the most recent census, which recorded a population of 19,345 in 2020.
The average household income in Lake Forest is $302,171 with a poverty rate of 3.95%. The median age in Lake Forest is 46.1 years: 44.6 years for males, and 48.5 years for females.