Marshall County, South Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 37th-largest in South Dakota
The population of Marshall County, South Dakota is 4,355 as of the 2023 American Community Survey, making it the 37th-largest county in South Dakota. The median household income is $72,500, the median home value is $147,200, and the median age is 42.8.
The population of Marshall County has declined 5.3% since 2010 (4,643 → 4,395), a -0.39% annualized rate.
4,355
Population
-0.39%
Annual growth
5
People / sq mi
$72,500
Median Income
$147,200
Median Home Value
Marshall County covers 838 sq mi of land at 5.2 people per square mile.
About Marshall County, SD
Marshall County is a county in South Dakota with a population of 4,355. It ranks #37 among counties in South Dakota by population. The median age is 42.8, older than the national median. The population is 52.2% male and 47.8% female.
The median household income in Marshall County is $72,500, near the US median of $74,580. 2.0% of residents live below the federal poverty level. Home values sit at a median of $147,200, with monthly rent averaging $743. The homeownership rate of 80.1% is higher than the national rate of 64.8%.
Educational attainment in Marshall County reflects 22.4% of adults 25 and older holding a bachelor's degree or higher, below the national average of 34.3%. Roughly 5.8% of workers primarily work from home, below the national work-from-home rate of 14.2%. The average commute is 16.0 minutes each way.
Marshall County Population History (2010-2024)
The county of Marshall County had a population of 4,643 in 2010 and 4,395 in 2024, a -5.3% growth over 14 years. The peak was 4,913 in 2019. Average annual growth rate: -0.32%.
4,395
Population (2024)
4,643
Population (2010)
4,913
Peak (2019)
-0.32%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 4,643 |
| 2011 | 4,627 |
| 2012 | 4,694 |
| 2013 | 4,802 |
| 2014 | 4,734 |
| 2015 | 4,830 |
| 2016 | 4,835 |
| 2017 | 4,898 |
| 2018 | 4,873 |
| 2019 | 4,913 |
| 2020 | 4,298 |
| 2021 | 4,314 |
| 2022 | 4,354 |
| 2023 | 4,358 |
| 2024 | 4,395 |
Race & Ethnicity
| White | 86.1% |
| Black or African American | 0.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 9.2% |
| Two or More Races | 0.0% |
Age & Sex
42.8
Median Age
47.8%
Female
52.2%
Male
22.7%
Age 65+
Age Distribution
Children (under 15): 20.1% · Seniors (65+): 22.7%
Income & Poverty
| Median household income | $72,500+$79 vs state |
| Mean household income | $101,999 |
| Per-capita income | $42,601 |
| Poverty rate | 2.0%-5.4% vs state |
| Unemployment rate | 0.7% |
| Employment-to-population | 64.1% |
Top Industries by Employment
The largest employment sector in Marshall County is manufacturing, accounting for 17.3% of workers.
How residents commute
1.9%
Drive alone
4.6%
Carpool
75.9%
Public transit
5.8%
Work from home
16.0 min
Avg commute
Housing
$147,200$-89,600 vs state
Median home value
$743
Median rent
80.1%
Homeownership rate
2,430
Total housing units
67.7%
Occupied
32.3%
Vacant
19.9%
Renter-occupied
Social & access
96.6%
With health insurance
92.2%
With broadband internet
24.5%
Foreign-born
8.3%
Veterans (18+)
11.6%
With a disability
95.4%
Speak language other than English at home
Education
92.1%
High School+
22.4%
Bachelor's+
Largest cities in South Dakota
Other counties in South Dakota
Part of South Dakota
Metro areas in South Dakota
County rankings
Frequently Asked Questions
Marshall County, South Dakota has a population of 4,355 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 37th-largest county in South Dakota. Population density is 5 people per square mile.
The population of Marshall County has declined 5.3% since 2010 (4,643 → 4,395), a -0.39% annualized rate.
The median household income in Marshall County, South Dakota is $72,500, with mean (average) household income of $101,999 and per-capita income of $42,601. 2.0% of residents live below the federal poverty level.
In Marshall County, the largest racial and ethnic groups are White (86.1%), Hispanic or Latino (9.2%), Black or African American (0.3%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Marshall County, South Dakota is 42.8 years. Residents are 47.8% female and 52.2% male.
The median home value in Marshall County is $147,200 and median monthly rent is $743. 80.1% of occupied housing units are owner-occupied. The county has 2,430 total housing units, 32.3% of which are vacant.
The largest employment sector in Marshall County, South Dakota is manufacturing, employing 17.3% of workers. The unemployment rate is 0.7%.
Sioux Falls is among the largest cities associated with Marshall County, South Dakota, with a population of 197,642.
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Statewide data for South Dakota
Population, race, income, age, and trends across South Dakota
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.