DeKalb County, Illinois Age & Gender Distribution (2024)
Population distribution by age and gender for DeKalb County, Illinois
DeKalb County, Illinois Age & Gender Statistics (2024)
Total Population
100,703
Median Age
32.7
Male Median
32.4
Female Median
32.8
DeKalb County, Illinois Population Growth
DeKalb County, Illinois Demographic Trend
Since 2010, the population of has changed by -3.2%%.
-3.2%% Growth
DeKalb County, Illinois Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
DeKalb County, Illinois Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 32.7 | 100,703 |
| 2023 | 32.6 | 100,512 |
| 2022 | 31.8 | 100,686 |
| 2021 | 31.4 | 100,922 |
| 2020 | 31.3 | 104,588 |
| 2019 | 31.1 | 104,366 |
| 2018 | 31.0 | 104,200 |
| 2017 | 30.7 | 104,473 |
| 2016 | 30.5 | 104,458 |
| 2015 | 30.3 | 104,345 |
| 2014 | 29.8 | 104,919 |
| 2013 | 29.6 | 104,820 |
| 2012 | 29.4 | 104,820 |
| 2011 | 29.1 | 104,684 |
| 2010 | 29.0 | 104,026 |
DeKalb County, Illinois Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.4% |
| 5–17 | 16.2% |
| 18–24 | 18.2% |
| 25–34 | 13.4% |
| 35–54 | 22.1% |
| 55–64 | 10.8% |
| 65+ | 13.9% |
Dependency Ratios for DeKalb County, Illinois
- Total Dependency Ratio:
- 55.0
- Youth Dependency:
- 33.4
- Old-Age Dependency:
- 21.6
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for DeKalb County, Illinois
The median age in DeKalb County, Illinois is 32.7 years.
According to latest Census data, the total population of DeKalb County, Illinois is 100,703.
In DeKalb County, Illinois, seniors (ages 65+) make up 13.9% of the population, while children under 18 represent 16.2%.
Based on historical data since 2010, the population in DeKalb County, Illinois is aging.