Marshall County's estimated 2026 population is 40,716 with a growth rate of 0.4% 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 -0.01% 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 and multiracial populations.
White (74.64%)
Two or more races (11.48%)
Other race (6.41%)
Asian (4.35%)
Black or African American (1.94%)
Native American (1.17%)
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% |
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