Polk County's 2026 population is estimated at 533,581, reflecting a 1.66% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Polk County is the largest county in Iowa. The 2010 population was 432,360 and has grown 23.41% since 2010.
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