Jefferson County, Illinois Age & Gender Distribution (2024)
Population distribution by age and gender for Jefferson County, Illinois
Jefferson County, Illinois Age & Gender Statistics (2024)
Total Population
36,550
Median Age
41.2
Male Median
39.2
Female Median
43.5
Jefferson County, Illinois Population Growth
Jefferson County, Illinois Demographic Trend
Since 2010, the population of has changed by -6.8%%.
-6.8%% Growth
Jefferson County, Illinois Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Jefferson County, Illinois Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 41.2 | 36,550 |
| 2023 | 41.1 | 36,808 |
| 2022 | 41.2 | 37,043 |
| 2021 | 41.2 | 37,362 |
| 2020 | 41.2 | 37,774 |
| 2019 | 40.9 | 37,985 |
| 2018 | 41.0 | 38,169 |
| 2017 | 40.9 | 38,358 |
| 2016 | 40.9 | 38,523 |
| 2015 | 40.7 | 38,578 |
| 2014 | 40.9 | 38,716 |
| 2013 | 40.6 | 38,769 |
| 2012 | 40.5 | 38,908 |
| 2011 | 40.7 | 39,032 |
| 2010 | 40.3 | 39,202 |
Jefferson County, Illinois Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.7% |
| 5–17 | 16.6% |
| 18–24 | 7.2% |
| 25–34 | 12.3% |
| 35–54 | 24.8% |
| 55–64 | 13.5% |
| 65+ | 20.0% |
Dependency Ratios for Jefferson County, Illinois
- Total Dependency Ratio:
- 73.1
- Youth Dependency:
- 38.6
- Old-Age Dependency:
- 34.6
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Jefferson County, Illinois
The median age in Jefferson County, Illinois is 41.2 years.
According to latest Census data, the total population of Jefferson County, Illinois is 36,550.
In Jefferson County, Illinois, seniors (ages 65+) make up 20.0% of the population, while children under 18 represent 16.6%.
Based on historical data since 2010, the population in Jefferson County, Illinois has remained stable.