St. Louis County, Missouri Age & Gender Distribution (2024)
Population distribution by age and gender for St. Louis County, Missouri
St. Louis County, Missouri Age & Gender Statistics (2024)
Total Population
995,569
Median Age
40.3
Male Median
38.6
Female Median
41.9
St. Louis County, Missouri Population Growth
St. Louis County, Missouri Demographic Trend
Since 2010, the population of has changed by -0.4%%.
-0.4%% Growth
St. Louis County, Missouri Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
St. Louis County, Missouri Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.3 | 995,569 |
| 2023 | 40.2 | 996,618 |
| 2022 | 40.2 | 999,703 |
| 2021 | 40.3 | 1,001,982 |
| 2020 | 40.4 | 996,179 |
| 2019 | 40.3 | 996,919 |
| 2018 | 40.3 | 998,684 |
| 2017 | 40.3 | 999,539 |
| 2016 | 40.3 | 1,000,560 |
| 2015 | 40.2 | 1,001,327 |
| 2014 | 40.2 | 1,000,423 |
| 2013 | 40.0 | 999,725 |
| 2012 | 39.8 | 999,147 |
| 2011 | 39.7 | 998,760 |
| 2010 | 39.4 | 999,454 |
St. Louis County, Missouri Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.6% |
| 5–17 | 16.4% |
| 18–24 | 8.4% |
| 25–34 | 12.7% |
| 35–54 | 24.5% |
| 55–64 | 13.3% |
| 65+ | 19.1% |
Dependency Ratios for St. Louis County, Missouri
- Total Dependency Ratio:
- 69.8
- Youth Dependency:
- 37.3
- Old-Age Dependency:
- 32.5
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for St. Louis County, Missouri
The median age in St. Louis County, Missouri is 40.3 years.
According to latest Census data, the total population of St. Louis County, Missouri is 995,569.
In St. Louis County, Missouri, seniors (ages 65+) make up 19.1% of the population, while children under 18 represent 16.4%.
Based on historical data since 2010, the population in St. Louis County, Missouri has remained stable.