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

Population trends in
Figure 1: Annual population growth trend for (2010–2024).

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

Population pyramid for

Figure 2: Population distribution by age and gender for 2024.


St. Joseph County, Indiana Historical Population Data

YearMedian AgePopulation
202436.7273,040
202336.7272,574
202236.7272,388
202136.8272,049
202036.7270,881
201936.6270,216
201836.5269,240
201736.5268,613
201636.4267,696
201536.5267,246
201436.4266,916
201336.4266,694
201236.1266,785
201136.1266,740
201035.9266,522

St. Joseph County, Indiana Age Group Breakdown (2024)

Age CohortPercentage
Under 56.1%
5–1717.1%
18–2411.3%
25–3413.3%
35–5423.6%
55–6411.7%
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.
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