O'Brien County, Iowa Age & Gender Distribution (2024)
Population distribution by age and gender for O'Brien County, Iowa
O'Brien County, Iowa Age & Gender Statistics (2024)
Total Population
14,126
Median Age
39.5
Male Median
38.4
Female Median
40.6
O'Brien County, Iowa Population Growth
O'Brien County, Iowa Demographic Trend
Since 2010, the population of has changed by -2.0%%.
-2.0%% Growth
O'Brien County, Iowa Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
O'Brien County, Iowa Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 39.5 | 14,126 |
| 2023 | 39.8 | 14,103 |
| 2022 | 40.4 | 14,138 |
| 2021 | 40.7 | 14,139 |
| 2020 | 41.8 | 13,796 |
| 2019 | 41.9 | 13,835 |
| 2018 | 42.4 | 13,911 |
| 2017 | 43.3 | 13,944 |
| 2016 | 43.4 | 14,055 |
| 2015 | 44.0 | 14,092 |
| 2014 | 44.0 | 14,173 |
| 2013 | 44.0 | 14,249 |
| 2012 | 44.4 | 14,302 |
| 2011 | 43.8 | 14,352 |
| 2010 | 44.4 | 14,419 |
O'Brien County, Iowa Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 6.8% |
| 5–17 | 17.6% |
| 18–24 | 7.3% |
| 25–34 | 12.1% |
| 35–54 | 22.6% |
| 55–64 | 12.3% |
| 65+ | 21.2% |
Dependency Ratios for O'Brien County, Iowa
- Total Dependency Ratio:
- 83.7
- Youth Dependency:
- 44.8
- Old-Age Dependency:
- 38.9
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for O'Brien County, Iowa
The median age in O'Brien County, Iowa is 39.5 years.
According to latest Census data, the total population of O'Brien County, Iowa is 14,126.
In O'Brien County, Iowa, seniors (ages 65+) make up 21.2% of the population, while children under 18 represent 17.6%.
Based on historical data since 2010, the population in O'Brien County, Iowa is becoming younger.