Marion County's estimated 2026 population is 34,429 with a growth rate of 0.69% 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 3.62% since that time.
Data after 2023 is projected based on recent change
Overall: 39.9 years
Female: 41 years
Male: 38.6 years
There are 25,873 adults, (6,515 of whom are seniors) in Marion County.
Female: 16,759 (49.8%)
Male: 16,883 (50.2%)
The racial composition of Marion County includes 94.41% White, and smaller percentages for Asian, other race, Black or African American, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 31,760 | 94.41% |
| Two or more races | 1,039 | 3.09% |
| Asian | 473 | 1.41% |
| Other race | 217 | 0.65% |
| Black or African American | 141 | 0.42% |
| Native American | 12 | 0.04% |
Marion County's average per capita income is $51,856. Household income levels show a median of $78,680. The poverty rate stands at 8.17%.
Name | Median | Mean |
|---|---|---|
| Married Families | $106,226 | - |
| Families | $99,269 | $118,610 |
| Households | $78,680 | $100,547 |
| Non Families | $43,168 | $59,770 |
Average Income
Median Household Income
Poverty Rate
