Lake Forest city, Illinois
Official LSAD Designation: Lake Forest city • Census GEOID: 1741105
• Lake County
Demographics & Population Profile
Population and demographics for Lake Forest city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 19,731 | — | 2025 | Census |
| Median Age | 46.1 yrs | ±2.3 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 6,900 | ±264 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).