St. Joseph County, Indiana Age & Gender Distribution (2024)
Population distribution by age and gender for St. Joseph County, Indiana
St. Joseph County, Indiana Age & Gender Statistics (2024)
Total Population
273,040
Median Age
36.7
Male Median
35.6
Female Median
37.7
St. Joseph County, Indiana Population Growth

St. Joseph County, Indiana Demographic Trend
Since 2010, the population of has changed by +2.4%%.
+2.4%% Growth
St. Joseph County, Indiana Age & Gender Pyramid

Figure 2: Population distribution by age and gender for 2024.
St. Joseph County, Indiana Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 36.7 | 273,040 |
| 2023 | 36.7 | 272,574 |
| 2022 | 36.7 | 272,388 |
| 2021 | 36.8 | 272,049 |
| 2020 | 36.7 | 270,881 |
| 2019 | 36.6 | 270,216 |
| 2018 | 36.5 | 269,240 |
| 2017 | 36.5 | 268,613 |
| 2016 | 36.4 | 267,696 |
| 2015 | 36.5 | 267,246 |
| 2014 | 36.4 | 266,916 |
| 2013 | 36.4 | 266,694 |
| 2012 | 36.1 | 266,785 |
| 2011 | 36.1 | 266,740 |
| 2010 | 35.9 | 266,522 |
St. Joseph County, Indiana Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 6.1% |
| 5–17 | 17.1% |
| 18–24 | 11.3% |
| 25–34 | 13.3% |
| 35–54 | 23.6% |
| 55–64 | 11.7% |
| 65+ | 16.9% |
Dependency Ratios for St. Joseph County, Indiana
- Total Dependency Ratio:
- 66.8
- Youth Dependency:
- 38.7
- Old-Age Dependency:
- 28.1
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for St. Joseph County, Indiana
The median age in St. Joseph County, Indiana is 36.7 years.
According to latest Census data, the total population of St. Joseph County, Indiana is 273,040.
In St. Joseph County, Indiana, seniors (ages 65+) make up 16.9% of the population, while children under 18 represent 17.1%.
Based on historical data since 2010, the population in St. Joseph County, Indiana has remained stable.