How many people live in Marshall County, IN?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 46,500 people living in Marshall County, IN. That makes Marshall County the 32nd-most populous county in Indiana. It is home to 0.67% of people living in the state.
46.5K
population of Marshall County, IN (2024)
0.67%
County share of the Indiana population (2024)
About 46,500 people lived in Marshall County, IN in 2024.
Population estimates, 2000–2024
What are Marshall County, IN’s age demographics?
About 9,100 Marshall County residents are aged 65 and older in 2024. That represents 19.5% of its population. For comparison, the age group represents 17.5% of Indiana’s population and 18% in the US overall.
Another 11,100 Marshall County residents, or 23.8% 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 lower share of Marshall County, IN's population is aged 25–44 than the US as a whole.
Population estimates by age group, (2024)
What are Marshall County, IN’s racial and ethnic demographics?
Non-Hispanic white residents make up 84.4% of the Marshall County, IN population, higher than the national share of 57.5%.
In contrast, Marshall County’s non-Hispanic Black or African American population accounts for 0.75%, below the 12.6% nationwide, and the Hispanic population makes up 12.6% of the county, compared with 20% 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.
Marshall County, IN has a higher share of a non-Hispanic white population than Indiana as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Marshall County, IN is Plymouth with about 11,000 residents in 2024.
Cities and towns in Marshall County, IN ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Plymouth (pt.) | 11,042 |
| 2. | Bremen | 4,603 |
| 3. | Polk | 2,740 |
| 4. | Argos (pt.) | 1,694 |
| 5. | Bourbon | 1,671 |
| 6. | Tippecanoe | 1,289 |
| 7. | Culver | 1,220 |
| 8. | La Paz | 463 |
| 9. | Argos (pt.) | 56 |
| 10. | Plymouth (pt.) |
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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.
