Polk County's estimated 2026 population is 519,581 with a growth rate of 0.59% in the past year according to the most recent United States census data. Polk County is the largest county in Iowa. The 2010 population was 432,360 and has seen a growth of 20.17% since that time.
Data after 2023 is projected based on recent change
Overall: 36.2 years
Female: 36.8 years
Male: 35.6 years
There are 380,581 adults, (70,275 of whom are seniors) in Polk County.
Female: 252,715 (50.2%)
Male: 250,460 (49.8%)
The racial composition of Polk County includes 75.77% White, 7.43% Black or African American, 4.98% Asian, 3.72% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 381,269 | 75.77% |
| Two or more races | 38,930 | 7.74% |
| Black or African American | 37,401 | 7.43% |
| Asian | 25,053 | 4.98% |
| Other race | 18,722 | 3.72% |
| Native American | 1,562 | 0.31% |
| Native Hawaiian or Pacific Islander | 238 | 0.05% |
Polk County's average per capita income is $55,356. Household income levels show a median of $83,576. The poverty rate stands at 10.31%.
Name | Median | Mean |
|---|---|---|
| Married Families | $128,378 | $153,740 |
| Families | $107,616 | $133,039 |
| Households | $83,576 | $109,398 |
| Non Families | $53,211 | $68,936 |
Average Income
Median Household Income
Poverty Rate