Johnson County, Iowa Age & Gender Distribution (2024)
Population distribution by age and gender for Johnson County, Iowa
Johnson County, Iowa Age & Gender Statistics (2024)
Total Population
156,639
Median Age
31.0
Male Median
30.6
Female Median
31.5
Johnson County, Iowa Population Growth
Johnson County, Iowa Demographic Trend
Since 2010, the population of has changed by +23.3%%.
+23.3%% Growth
Johnson County, Iowa Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Johnson County, Iowa Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 31.0 | 156,639 |
| 2023 | 30.8 | 154,881 |
| 2022 | 30.6 | 153,360 |
| 2021 | 30.7 | 151,833 |
| 2020 | 30.4 | 150,819 |
| 2019 | 30.3 | 148,577 |
| 2018 | 30.0 | 147,001 |
| 2017 | 29.9 | 144,425 |
| 2016 | 29.9 | 142,006 |
| 2015 | 29.8 | 139,436 |
| 2014 | 29.7 | 136,802 |
| 2013 | 29.5 | 134,034 |
| 2012 | 29.3 | 131,627 |
| 2011 | 29.0 | 129,159 |
| 2010 | 28.8 | 126,994 |
Johnson County, Iowa Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.3% |
| 5–17 | 14.0% |
| 18–24 | 20.8% |
| 25–34 | 14.8% |
| 35–54 | 22.3% |
| 55–64 | 9.5% |
| 65+ | 13.3% |
Dependency Ratios for Johnson County, Iowa
- Total Dependency Ratio:
- 48.4
- Youth Dependency:
- 28.7
- Old-Age Dependency:
- 19.7
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Johnson County, Iowa
The median age in Johnson County, Iowa is 31.0 years.
According to latest Census data, the total population of Johnson County, Iowa is 156,639.
In Johnson County, Iowa, seniors (ages 65+) make up 13.3% of the population, while children under 18 represent 14.0%.
Based on historical data since 2010, the population in Johnson County, Iowa is aging.