DeKalb city, Illinois
Official LSAD Designation: DeKalb city • Census GEOID: 1719161
• DeKalb County
Demographics & Population Profile
Population and demographics for DeKalb city.
| Demographic Variable | Estimate / Count | Margin of Error | Period | Source |
|---|---|---|---|---|
| Total Population (2025 PEP Estimate) | 40,467 | — | 2025 | Census |
| Median Age | 26.1 yrs | ±1 | 2020-2024 | Census ACS 5-Year 2024 |
| Total Households | 16,388 | ±497 | 2020-2024 | Census ACS 5-Year 2024 |
Source: U.S. Census Bureau (PEP, ACS 5-Year).