How many people live in Marshall County, IA?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 40,400 people living in Marshall County, IA. That makes Marshall County the 15th-most populous county in Iowa. It is home to 1.2% of people living in the state.
40.4K
population of Marshall County, IA (2024)
1.2%
County share of the Iowa population (2024)
About 40,400 people lived in Marshall County, IA in 2024.
Population estimates, 2000–2024
What are Marshall County, IA’s age demographics?
About 7,400 Marshall County, IA residents are aged 65 and older in 2024. That represents 18.4% of its population. For comparison, the age group represents 18.9% of Iowa’s population and 18% in the US overall.
Another 10,100 Marshall County residents, or 25.1% of the population, were children under 18. For comparison, the age group represents 22.5% of Iowa’s population and 21.6% in the US overall.
A higher share of Marshall County, IA's population is aged under 18 than the US as a whole.
Population estimates by age group, (2024)
What are Marshall County, IA’s racial and ethnic demographics?
Non-Hispanic white residents make up 64.5% of the Marshall County, IA population, higher than the national share of 57.5%. Marshall County, IA also has a larger share of people identifying as Hispanic (26.1%) than the US overall (20%).
In contrast, Marshall County’s non-Hispanic Black or African American population accounts for 2.6%, below the 12.6% nationwide, and the non-Hispanic Asian population makes up 4.3% 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.
Marshall County, IA has a higher share of a Hispanic population than Iowa as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Marshall County, IA is Marshalltown with about 27,900 residents in 2024.
Cities and towns in Marshall County, IA ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Marshalltown | 27,886 |
| 2. | State Center | 1,403 |
| 3. | Le Grand (pt.) | 891 |
| 4. | Melbourne | 771 |
| 5. | Gilman | 530 |
| 6. | Albion | 444 |
| 7. | Liscomb | 292 |
| 8. | Rhodes | 269 |
| 9. | Laurel | 214 |
| 10. | Haverhill | 164 |
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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.
