Marshall County's estimated 2026 population is 39,652 with a growth rate of -0.6% 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 -2.63% since that time.
Data after 2023 is projected based on recent change
Overall: 38.5 years
Female: 39.5 years
Male: 37.7 years
There are 29,939 adults, (7,301 of whom are seniors) in Marshall County.
Female: 19,785 (49.3%)
Male: 20,329 (50.7%)
The racial composition of Marshall County includes 70.62% White, 8.2% other race, 4.12% Asian, and smaller percentages for Black or African American, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 28,330 | 70.62% |
| Two or more races | 5,513 | 13.74% |
| Other race | 3,289 | 8.2% |
| Asian | 1,652 | 4.12% |
| Black or African American | 824 | 2.05% |
| Native American | 506 | 1.26% |
Marshall County's average per capita income is $44,300. Household income levels show a median of $73,315. The poverty rate stands at 11.15%.
Name | Median | Mean |
|---|---|---|
| Married Families | $96,194 | $108,593 |
| Families | $87,339 | $99,260 |
| Households | $73,315 | $85,510 |
| Non Families | $44,072 | $56,765 |
Average Income
Median Household Income
Poverty Rate