Grundy County's estimated 2026 population is 54,383 with a growth rate of 0.61% in the past year according to the most recent United States census data. Grundy County is the 24th largest county in Illinois. The 2010 population was 50,155 and has seen a growth of 8.43% since that time.
Data after 2023 is projected based on recent change
Overall: 38.3 years
Female: 39.5 years
Male: 37.1 years
There are 40,280 adults, (8,031 of whom are seniors) in Grundy County.
Female: 26,410 (49.6%)
Male: 26,809 (50.4%)
The racial composition of Grundy County includes 86.31% White, 3.38% other race, and smaller percentages for Black or African American, Asian, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 45,933 | 86.31% |
| Two or more races | 3,929 | 7.38% |
| Other race | 1,798 | 3.38% |
| Black or African American | 1,220 | 2.29% |
| Asian | 301 | 0.57% |
| Native American | 38 | 0.07% |
Grundy County's average per capita income is $57,775. Household income levels show a median of $92,235. The poverty rate stands at 5.99%.
Name | Median | Mean |
|---|---|---|
| Married Families | $119,060 | - |
| Families | $110,082 | $129,324 |
| Households | $92,235 | $111,828 |
| Non Families | $58,282 | $69,527 |
Average Income
Median Household Income
Poverty Rate
