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
The poverty rate is what most separates Marshall County from the typical county: 2.0% of residents live below the federal poverty line, against 12.4% nationally. Marshall County is a county in South Dakota with a population of 4,355. It ranks #37 among counties in South Dakota by population.
Households take in a median $72,500, comfortably below the US median of $78,538. Poverty is among the lowest of comparable US counties, at 2.0% — below the national 12.4%. The typical home is valued at $147,200, with typical rent around $743.
Roughly 22.4% of adults have a bachelor’s, below the national 35.0%. Most workers commute: only 5.8% work from home, below the national 14.0%, and the average commute runs about 16 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.