How many people live in St. Joseph County, IN?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 273,700 people living in St. Joseph County, IN. That makes St. Joseph County the fifth-most populous county in Indiana. It is home to 3.9% of people living in the state.
274K
population of St. Joseph County, IN (2024)
3.9%
County share of the Indiana population (2024)
About 273,700 people lived in St. Joseph County, IN in 2024.
Population estimates, 2000–2024
What are St. Joseph County, IN’s age demographics?
About 48,000 St. Joseph County, IN residents are aged 65 and older in 2024. That represents 17.5% of its population. For comparison, the age group represents 17.5% of Indiana’s population and 18% in the US overall.
Another 62,500 St. Joseph County residents, or 22.8% of the population, were children under 18. For comparison, the age group represents 22.9% of Indiana’s population and 21.6% in the US overall.
A higher share of St. Joseph County, IN's population is aged 18–24 than the US as a whole.
Population estimates by age group, (2024)
What are St. Joseph County, IN’s racial and ethnic demographics?
Non-Hispanic white residents make up 68.8% of the St. Joseph County, IN population, higher than the national share of 57.5%. St. Joseph County, IN also has a larger share of people identifying as non-Hispanic Black or African American (13.4%) than the US overall (12.6%).
In contrast, St. Joseph County’s Hispanic population accounts for 11.3%, below the 20% nationwide, and the non-Hispanic Asian population makes up 3% of the county, compared with 6.5% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
St. Joseph County, IN has a higher share of a non-Hispanic Black or African American population than Indiana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in St. Joseph County, IN is South Bend with about 84,800 residents in 2024.
Cities and towns in St. Joseph County, IN ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | South Bend (pt.) | 84,824 |
| 2. | Mishawaka (pt.) | 43,899 |
| 3. | South Bend (pt.) | 8,256 |
| 4. | South Bend (pt.) | 5,490 |
| 5. | Mishawaka (pt.) | 3,851 |
| 6. | Mishawaka (pt.) | 3,270 |
| 7. | Greene | 2,964 |
| 8. | South Bend (pt.) | 2,721 |
| 9. | Osceola | 2,600 |
| 10. | South Bend (pt.) | 2,422 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
