Marshall County's estimated 2026 population is 4,417 with a growth rate of -0.2% in the past year according to the most recent United States census data. Marshall County is the 38th largest county in South Dakota. The 2010 population was 4,643 and has seen a growth of -4.87% since that time.
Data after 2023 is projected based on recent change
Overall: 42.5 years
Female: 45.1 years
Male: 40.6 years
There are 3,287 adults, (1,009 of whom are seniors) in Marshall County.
Female: 2,044 (47.1%)
Male: 2,300 (52.9%)
The racial composition of Marshall County includes 84.48% White, 5.87% Native American, and smaller percentages for other race, Black or African American, Asian and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 3,670 | 84.48% |
| Two or more races | 279 | 6.42% |
| Native American | 255 | 5.87% |
| Other race | 113 | 2.6% |
| Black or African American | 19 | 0.44% |
| Asian | 8 | 0.18% |
Marshall County's average per capita income is $46,820. Household income levels show a median of $78,156. The poverty rate stands at 6.06%.
Name | Median | Mean |
|---|---|---|
| Married Families | $110,250 | - |
| Families | $106,382 | $133,762 |
| Households | $78,156 | $103,822 |
| Non Families | $38,813 | $43,595 |
Average Income
Median Household Income
Poverty Rate