Grundy County's estimated 2026 population is 12,391 with a growth rate of -0.06% in the past year according to the most recent United States census data. Grundy County is the 61st largest county in Iowa. The 2010 population was 12,464 and has seen a growth of -0.59% since that time.
Data after 2023 is projected based on recent change
The racial composition of Grundy County includes 96.15% White, and smaller percentages for Two or more races, other race, Black or African American, Asian, Native American and multiracial populations.
White (96.15%)
Two or more races (1.57%)
Other race (0.87%)
Black or African American (0.7%)
Asian (0.46%)
Native American (0.25%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 11,876 | 96.15% |
| Two or more races | 194 | 1.57% |
| Other race | 108 | 0.87% |
| Black or African American | 86 | 0.7% |
| Asian | 57 | 0.46% |
| Native American | 31 | 0.25% |
Married
Widowed
Divorced
Separated
Never Married
Grundy County's average per capita income is $49,600. Household income levels show a median of $83,617. The poverty rate stands at 6.44%.
Name | Median | Mean |
|---|---|---|
| Married Families | $109,144 | - |
| Families | $98,725 | $111,249 |
| Households | $83,617 | $95,092 |
| Non Families | $42,824 | $56,893 |
Average Income
Median Household Income
Poverty Rate