Grundy County's estimated 2026 population is 54,331 with a growth rate of 0.46% in the past year according to the most recent United States census data. Grundy County is the 25th largest county in Illinois. The 2010 population was 50,155 and has seen a growth of 8.33% since that time.
Data after 2023 is projected based on recent change
The racial composition of Grundy County includes 88.38% White, and smaller percentages for other race, Black or African American, Asian, Native American and multiracial populations.
White (88.38%)
Two or more races (6.25%)
Other race (2.73%)
Black or African American (2.13%)
Asian (0.44%)
Native American (0.08%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 46,772 | 88.38% |
| Two or more races | 3,306 | 6.25% |
| Other race | 1,443 | 2.73% |
| Black or African American | 1,127 | 2.13% |
| Asian | 231 | 0.44% |
| Native American | 41 | 0.08% |
Married
Widowed
Divorced
Separated
Never Married
Grundy County's average per capita income is $59,106. Household income levels show a median of $93,060. The poverty rate stands at 6.3%.
Name | Median | Mean |
|---|---|---|
| Married Families | $117,762 | - |
| Families | $109,922 | $129,321 |
| Households | $93,060 | $111,929 |
| Non Families | $54,411 | $69,809 |
Average Income
Median Household Income
Poverty Rate
