| Name | Grundy County |
| State | Iowa |
| FIPS Code | 19075 |
| County Seat | Grundy Center |
| Timezone | Central Daylight Time (CDT) |
| Population (2024) | 12,412 |
| Population Growth Rate(2020-2024) | 0.59% |
| Majority Ethnicity | White 97.03% |
| Public School Majority Ethnicity | White 93% |
| Partisan Voting Index | Strongly Republican:+21 |
| Unemployment Rate (May 2026) | 3.4% |
| Sales Tax Rate (2025) | 7% |
| Area Code(s) | 319 / 641 |
| Race/Ethnicity | Percentage of Population (2023) |
|---|---|
| White | 97.03% |
| African American | 0.7% |
| Hispanic | 1.54% |
| Asian | 0.47% |
| Native American | 0.25% |
| Hawaiin/Pacific Islander | 0% |
| Race/Ethnicity | Percentage of Public School Students (2023) |
|---|---|
| White | 93.23% |
| African American | 0.81% |
| Hispanic | 2.26% |
| Asian | 0.3% |
| Native American | 0.26% |
| Hawaiin/Pacific Islander | 0.21% |