Mahaska County's 2026 population is estimated at 22,168, reflecting a 0.3% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Mahaska County is the 28th largest county in Iowa. The 2010 population was 22,409 and has grown -1.08% since 2010.
Data after 2023 is projected based on recent change
Overall: 39 years
Female: 39.5 years
Male: 38.2 years
There are 16,808 adults, (4,199 of whom are seniors) in Mahaska County.
Female: 10,832 (49.2%)
Male: 11,189 (50.8%)
The racial composition of Mahaska County includes 92.23% White, and smaller percentages for Black or African American, Asian, other race, Native Hawaiian or Pacific Islander, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 20,310 | 92.23% |
| Two or more races | 955 | 4.34% |
| Black or African American | 293 | 1.33% |
| Asian | 229 | 1.04% |
| Other race | 151 | 0.69% |
| Native Hawaiian or Pacific Islander | 65 | 0.3% |
| Native American | 18 | 0.08% |
Mahaska County 's average per capita income is $45,796. Household income levels show a median of $70,940. The poverty rate stands at 12.64%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $98,599 | - |
| Families | $88,504 | $105,526 |
| Households | $70,940 | $86,931 |
| Non Families | $37,849 | $50,114 |
Average Income
Median Household Income
Poverty Rate
