Marion County's estimated 2026 population is 34,708 with a growth rate of 0.96% in the past year according to the most recent United States census data. Marion County is the 21st largest county in Iowa. The 2010 population was 33,225 and has seen a growth of 4.46% since that time.
Data after 2023 is projected based on recent change
The racial composition of Marion County includes 94.82% White, and smaller percentages for Two or more races, Asian, other race, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (94.82%)
Two or more races (2.61%)
Asian (1.29%)
Other race (0.67%)
Black or African American (0.51%)
Native American (0.08%)
Native Hawaiian or Pacific Islander (0.02%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 31,812 | 94.82% |
| Two or more races | 876 | 2.61% |
| Asian | 434 | 1.29% |
| Other race | 224 | 0.67% |
| Black or African American | 170 | 0.51% |
| Native American | 28 | 0.08% |
| Native Hawaiian or Pacific Islander | 7 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Marion County's average per capita income is $53,483. Household income levels show a median of $78,059. The poverty rate stands at 7.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $103,634 | - |
| Families | $97,685 | $118,073 |
| Households | $78,059 | $100,349 |
| Non Families | $40,976 | $59,932 |
Average Income
Median Household Income
Poverty Rate
