Marshall County's estimated 2026 population is 4,469 with a growth rate of 0.83% in the past year according to the most recent United States census data. Marshall County is the 37th largest county in South Dakota. The 2010 population was 4,643 and has seen a growth of -3.75% since that time.
Data after 2023 is projected based on recent change
The racial composition of Marshall County includes 86.11% White, 6.5% Native American, and smaller percentages for other race, Black or African American and multiracial populations.
White (86.11%)
Native American (6.5%)
Two or more races (5.33%)
Other race (1.81%)
Black or African American (0.25%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 3,750 | 86.11% |
| Native American | 283 | 6.5% |
| Two or more races | 232 | 5.33% |
| Other race | 79 | 1.81% |
| Black or African American | 11 | 0.25% |
Married
Widowed
Divorced
Separated
Never Married
Marshall County's average per capita income is $43,467. Household income levels show a median of $72,500. The poverty rate stands at 7.86%.
Name | Median | Mean |
|---|---|---|
| Married Families | $107,059 | - |
| Families | $103,542 | $134,111 |
| Households | $72,500 | $101,999 |
| Non Families | $38,807 | $44,776 |
Average Income
Median Household Income
Poverty Rate