| Name | Marion County |
| State | Iowa |
| FIPS Code | 19125 |
| County Seat | Knoxville |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 33,718 |
| Population Growth Rate(2020-2024) | 0.89% |
| Majority Ethnicity | White 95.82% |
| Public School Majority Ethnicity | White 90% |
| Partisan Voting Index | Republican:+19 |
| Unemployment Rate (May 2026) | 2.9% |
| Sales Tax Rate (2025) | 7% |
| Area Code(s) | 641 / 515 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 95.82% |
| African American | 0.51% |
| Hispanic | 2.25% |
| Asian | 1.31% |
| Native American | 0.08% |
| Hawaiin/Pacific Islander | 0.02% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 90.32% |
| African American | 1.08% |
| Hispanic | 3.77% |
| Asian | 1.07% |
| Native American | 0.2% |
| Hawaiin/Pacific Islander | 0.25% |