| Place Name | Marshalltown |
| Place Type | City |
| ZIP Code(s) | 50158 |
| County | Marshall County |
| Area Code(s) | 641 |
| Timezone | Central Daylight Time (CDT) |
| Population (2022) | 27,465 |
| Population Growth Rate (2010-19) | 0.14% |
| Majority Ethnicity | White 64.92% |
| Metro/Micro Stats Area | Marshalltown, IA |
| US Congressional District(s) | Iowa 1st |
| State House Districts | 71 |
| State Senate Districts | 36 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 64.92% |
| African American | 1.75% |
| Hispanic | 1.02% |
| Asian | 4.1% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 28.21% |