Jefferson County, Missouri Age & Gender Distribution (2024)
Population distribution by age and gender for Jefferson County, Missouri
Jefferson County, Missouri Age & Gender Statistics (2024)
Total Population
229,458
Median Age
40.3
Male Median
39.7
Female Median
41.1
Jefferson County, Missouri Population Growth
Jefferson County, Missouri Demographic Trend
Since 2010, the population of has changed by +6.1%%.
+6.1%% Growth
Jefferson County, Missouri Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
Jefferson County, Missouri Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.3 | 229,458 |
| 2023 | 40.2 | 228,227 |
| 2022 | 39.9 | 226,984 |
| 2021 | 39.9 | 225,913 |
| 2020 | 39.6 | 224,777 |
| 2019 | 39.2 | 223,951 |
| 2018 | 39.0 | 223,302 |
| 2017 | 38.8 | 222,639 |
| 2016 | 38.8 | 222,453 |
| 2015 | 38.6 | 221,577 |
| 2014 | 38.4 | 220,558 |
| 2013 | 38.1 | 219,636 |
| 2012 | 37.7 | 218,628 |
| 2011 | 37.4 | 217,531 |
| 2010 | 37.1 | 216,262 |
Jefferson County, Missouri Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.5% |
| 5–17 | 17.0% |
| 18–24 | 7.4% |
| 25–34 | 12.4% |
| 35–54 | 26.5% |
| 55–64 | 14.5% |
| 65+ | 16.7% |
Dependency Ratios for Jefferson County, Missouri
- Total Dependency Ratio:
- 64.4
- Youth Dependency:
- 37.0
- Old-Age Dependency:
- 27.4
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for Jefferson County, Missouri
The median age in Jefferson County, Missouri is 40.3 years.
According to latest Census data, the total population of Jefferson County, Missouri is 229,458.
In Jefferson County, Missouri, seniors (ages 65+) make up 16.7% of the population, while children under 18 represent 17.0%.
Based on historical data since 2010, the population in Jefferson County, Missouri is aging.