Johnson County, Illinois Age & Gender Distribution (2024)
Population distribution by age and gender for Johnson County, Illinois
Johnson County, Illinois Age & Gender Statistics (2024)
Total Population
13,376
Median Age
41.4
Male Median
40.5
Female Median
43.5
Johnson County, Illinois Population Growth
Johnson County, Illinois Demographic Trend
Since 2010, the population of has changed by +5.2%%.
+5.2%% Growth
Johnson County, Illinois Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Johnson County, Illinois Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 41.4 | 13,376 |
| 2023 | 42.7 | 13,350 |
| 2022 | 42.3 | 13,313 |
| 2021 | 43.4 | 13,238 |
| 2020 | 43.8 | 12,391 |
| 2019 | 43.7 | 12,494 |
| 2018 | 43.2 | 12,602 |
| 2017 | 42.5 | 12,899 |
| 2016 | 42.9 | 12,866 |
| 2015 | 43.2 | 12,829 |
| 2014 | 42.8 | 12,650 |
| 2013 | 42.2 | 12,665 |
| 2012 | 42.0 | 12,653 |
| 2011 | 42.0 | 12,666 |
| 2010 | 40.3 | 12,710 |
Johnson County, Illinois Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 4.2% |
| 5–17 | 14.3% |
| 18–24 | 10.5% |
| 25–34 | 12.7% |
| 35–54 | 24.8% |
| 55–64 | 13.8% |
| 65+ | 19.7% |
Dependency Ratios for Johnson County, Illinois
- Total Dependency Ratio:
- 61.9
- Youth Dependency:
- 30.0
- Old-Age Dependency:
- 31.8
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Johnson County, Illinois
The median age in Johnson County, Illinois is 41.4 years.
According to latest Census data, the total population of Johnson County, Illinois is 13,376.
In Johnson County, Illinois, seniors (ages 65+) make up 19.7% of the population, while children under 18 represent 14.3%.
Based on historical data since 2010, the population in Johnson County, Illinois has remained stable.