| Name | Marshall County |
| State | Iowa |
| FIPS Code | 19127 |
| County Seat | Marshalltown |
| Timezone | Central Standard Time (CST) |
| Population (2022) | 40,568 |
| Population Growth Rate(2000-2022) | -1.34% |
| Majority Ethnicity | White 91.75% |
| Public School Majority Ethnicity | White 45% |
| Partisan Voting Index | Republican:+2 |
| Unemployment Rate (December 2024) | 4.7% |
| Area Code(s) | 641 |
| Race/Ethnicity | Percentage of Population (2022) |
|---|---|
| White | 91.75% |
| African American | 2.46% |
| Hispanic | 0.85% |
| Asian | 4.94% |
| Native American | 0% |
| 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% |