Crystal Lake city, Illinois
Official LSAD Designation: Crystal Lake city • Census GEOID: 1717887
• McHenry County
Demographics & Population Profile
Population and demographics for Crystal Lake city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 42,288 | — | 2025 | Census |
| Median Age | 39.3 yrs | ±1.4 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 14,806 | ±501 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).