Jefferson County, Iowa Age & Gender Distribution (2024)
Population distribution by age and gender for Jefferson County, Iowa
Jefferson County, Iowa Age & Gender Statistics (2024)
Total Population
15,705
Median Age
43.7
Male Median
41.1
Female Median
47.3
Jefferson County, Iowa Population Growth
Jefferson County, Iowa Demographic Trend
Since 2010, the population of has changed by -5.6%%.
-5.6%% Growth
Jefferson County, Iowa Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Jefferson County, Iowa Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 43.7 | 15,705 |
| 2023 | 43.5 | 15,676 |
| 2022 | 44.2 | 15,785 |
| 2021 | 41.6 | 15,846 |
| 2020 | 42.9 | 18,153 |
| 2019 | 42.9 | 18,148 |
| 2018 | 43.0 | 18,077 |
| 2017 | 40.9 | 17,945 |
| 2016 | 41.1 | 17,662 |
| 2015 | 42.5 | 17,318 |
| 2014 | 42.7 | 17,102 |
| 2013 | 44.3 | 16,800 |
| 2012 | 44.0 | 16,791 |
| 2011 | 43.6 | 16,721 |
| 2010 | 44.9 | 16,643 |
Jefferson County, Iowa Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 4.6% |
| 5–17 | 12.5% |
| 18–24 | 8.0% |
| 25–34 | 15.4% |
| 35–54 | 20.4% |
| 55–64 | 12.4% |
| 65+ | 26.7% |
Dependency Ratios for Jefferson County, Iowa
- Total Dependency Ratio:
- 78.0
- Youth Dependency:
- 30.5
- Old-Age Dependency:
- 47.5
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Jefferson County, Iowa
The median age in Jefferson County, Iowa is 43.7 years.
According to latest Census data, the total population of Jefferson County, Iowa is 15,705.
In Jefferson County, Iowa, seniors (ages 65+) make up 26.7% of the population, while children under 18 represent 12.5%.
Based on historical data since 2010, the population in Jefferson County, Iowa has remained stable.