DeKalb County's 2026 population is estimated at 102,683, reflecting a 0.66% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). DeKalb County is the 19th largest county in Illinois. The 2010 population was 105,151 and has grown -2.35% since 2010.
Data after 2023 is projected based on recent change
Overall: 32.7 years
Female: 32.8 years
Male: 32.4 years
There are 78,980 adults, (14,020 of whom are seniors) in DeKalb County.
Female: 50,679 (50.3%)
Male: 50,024 (49.7%)
The racial composition of DeKalb County includes 74.16% White, 7.01% Black or African American, 5.33% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 74,678 | 74.16% |
| Two or more races | 10,589 | 10.52% |
| Black or African American | 7,056 | 7.01% |
| Other race | 5,363 | 5.33% |
| Asian | 2,331 | 2.31% |
| Native American | 658 | 0.65% |
| Native Hawaiian or Pacific Islander | 28 | 0.03% |
DeKalb County 's average per capita income is $50,637. Household income levels show a median of $70,724. The poverty rate stands at 14.8%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $118,045 | $134,322 |
| Families | $97,889 | $112,273 |
| Households | $70,724 | $90,834 |
| Non Families | $40,587 | $54,024 |
Average Income
Median Household Income
Poverty Rate
