| Name | Marshall County |
| State | Iowa |
| FIPS Code | 19127 |
| County Seat | Marshalltown |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 40,230 |
| Population Growth Rate(2020-2024) | 0.32% |
| Majority Ethnicity | White 70.47% |
| Public School Majority Ethnicity | White 45% |
| Partisan Voting Index | Republican:+7 |
| Unemployment Rate (May 2026) | 7.7% |
| Sales Tax Rate (2025) | 7% |
| Area Code(s) | 641 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 70.47% |
| African American | 1.84% |
| Hispanic | 22.48% |
| Asian | 4.11% |
| Native American | 1.11% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 44.59% |
| African American | 2.46% |
| Hispanic | 42.69% |
| Asian | 5.8% |
| Native American | 0.59% |
| Hawaiin/Pacific Islander | 0.84% |