| Name | Madison County |
| State | Iowa |
| FIPS Code | 19121 |
| County Seat | Winterset |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 16,999 |
| Population Growth Rate(2020-2024) | 2.67% |
| Majority Ethnicity | White 95.97% |
| Public School Majority Ethnicity | White 93% |
| Partisan Voting Index | Republican:+19 |
| Unemployment Rate (May 2026) | 3.7% |
| Sales Tax Rate (2025) | 7% |
| Area Code(s) | 515 / 641 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 95.97% |
| African American | 1.26% |
| Hispanic | 2.2% |
| Asian | 0.35% |
| Native American | 0.17% |
| Hawaiin/Pacific Islander | 0.05% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 92.98% |
| African American | 0.5% |
| Hispanic | 3.65% |
| Asian | 0.52% |
| Native American | 0.14% |
| Hawaiin/Pacific Islander | 0.05% |