Marshall County's estimated 2025 population is 40,400 with a growth rate of 0.48% in the past year according to the most recent United States census data. Marshall County is the 15th largest county in Iowa. The 2010 population was 40,722 and has seen a growth of -0.79% since that time.
Data after 2023 is projected based on recent change
The racial composition of Marshall County includes 74.64% White, 6.41% other race, 4.35% Asian, and smaller percentages for Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Other race
Asian
Black or African American
Native American
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 29,835 | 74.64% |
| Two or more races | 4,589 | 11.48% |
| Other race | 2,564 | 6.41% |
| Asian | 1,738 | 4.35% |
| Black or African American | 777 | 1.94% |
| Native American | 468 | 1.17% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
Marshall County's average per capita income is $44,256. Household income levels show a median of $72,785. The poverty rate stands at 11.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $96,069 | $109,380 |
| Families | $87,778 | $99,466 |
| Households | $72,785 | $84,571 |
| Non Families | $42,390 | $53,000 |
Average Income
Median Household Income
Poverty Rate