Polk County's estimated 2025 population is 513,397 with a growth rate of 0.8% in the past year according to the most recent United States census data. Polk County is the 1st largest county in Iowa. The 2010 population was 432,360 and has seen a growth of 18.74% since that time.
Data after 2023 is projected based on recent change
The racial composition of Polk County includes 77.81% White, 7.52% Black or African American, 4.96% Asian, 3.08% other race, and smaller percentages for Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (77.8%)
Black or African American (7.5%)
Two or more races (6.3%)
Asian (5.0%)
Other race (3.1%)
Native American (0.3%)
Native Hawaiian or Pacific Islander (0.0%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 387,043 | 77.81% |
| Black or African American | 37,411 | 7.52% |
| Two or more races | 31,318 | 6.3% |
| Asian | 24,695 | 4.96% |
| Other race | 15,331 | 3.08% |
| Native American | 1,552 | 0.31% |
| Native Hawaiian or Pacific Islander | 91 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Polk County's average per capita income is $54,313. Household income levels show a median of $81,621. The poverty rate stands at 10.06%.
Name | Median | Mean |
|---|---|---|
| Married Families | $123,668 | $149,989 |
| Families | $103,316 | $129,195 |
| Households | $81,621 | $106,356 |
| Non Families | $52,165 | $66,750 |
Average Income
Median Household Income
Poverty Rate