Lyman County, South Dakota Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 43rd-largest in South Dakota
The population of Lyman County, South Dakota is 3,717 as of the 2023 American Community Survey, making it the 43rd-largest county in South Dakota. The median household income is $61,169, the median home value is $156,500, and the median age is 36.0.
The population of Lyman County has declined 1.1% since 2010 (3,761 → 3,721), a -0.08% annualized rate.
3,717
Population
-0.08%
Annual growth
2
People / sq mi
$61,169
Median Income
$156,500
Median Home Value
Lyman County covers 1,642 sq mi of land at 2.3 people per square mile.
About Lyman County, SD
What distinguishes Lyman County is density: among the most sparsely settled of US counties, around 2 people per square mile. Lyman County is a county in South Dakota with a population of 3,717. It ranks #43 among counties in South Dakota by population.
Median household income is $61,169, below the US median of $78,538. Poverty sits at 17.5%, above the national 12.4%. The typical home is valued at $156,500, with typical rent around $603.
Degree attainment is mid-range for US counties: 25.3% of adults hold a four-year degree, below the national 35.0%. About 14.5% of workers primarily work from home, close to the national 14.0%, and the average commute runs about 15 minutes each way.
Lyman County Population History (2010-2024)
The county of Lyman County had a population of 3,761 in 2010 and 3,721 in 2024, a -1.1% growth over 14 years. The peak was 3,905 in 2016. Average annual growth rate: -0.07%.
3,721
Population (2024)
3,761
Population (2010)
3,905
Peak (2016)
-0.07%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 3,761 |
| 2011 | 3,808 |
| 2012 | 3,775 |
| 2013 | 3,843 |
| 2014 | 3,852 |
| 2015 | 3,875 |
| 2016 | 3,905 |
| 2017 | 3,869 |
| 2018 | 3,796 |
| 2019 | 3,787 |
| 2020 | 3,701 |
| 2021 | 3,760 |
| 2022 | 3,717 |
| 2023 | 3,720 |
| 2024 | 3,721 |
Race & Ethnicity
| White | 57.4% |
| Black or African American | 0.0% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 41.5% |
| Two or More Races | 0.0% |
Age & Sex
36.0
Median Age
47.8%
Female
52.2%
Male
18.0%
Age 65+
Age Distribution
Children (under 15): 23.5% · Seniors (65+): 18.0%
Income & Poverty
| Median household income | $61,169$-11,252 vs state |
| Mean household income | $80,098 |
| Per-capita income | $29,144 |
| Poverty rate | 17.5%+10.1% vs state |
| Unemployment rate | 2.1% |
| Employment-to-population | 55.0% |
Top Industries by Employment
The largest employment sector in Lyman County is professional & business services, accounting for 23.0% of workers.
How residents commute
0.2%
Drive alone
6.7%
Carpool
68.8%
Public transit
14.5%
Work from home
14.6 min
Avg commute
Housing
$156,500$-80,300 vs state
Median home value
$603
Median rent
72.2%
Homeownership rate
1,561
Total housing units
75.9%
Occupied
24.1%
Vacant
27.8%
Renter-occupied
Social & access
78.4%
With health insurance
88.4%
With broadband internet
15.0%
Foreign-born
5.8%
Veterans (18+)
15.6%
With a disability
95.9%
Speak language other than English at home
Education
91.0%
High School+
25.3%
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
Lyman County, South Dakota has a population of 3,717 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 43rd-largest county in South Dakota. Population density is 2 people per square mile.
The population of Lyman County has declined 1.1% since 2010 (3,761 → 3,721), a -0.08% annualized rate.
The median household income in Lyman County, South Dakota is $61,169, with mean (average) household income of $80,098 and per-capita income of $29,144. 17.5% of residents live below the federal poverty level.
In Lyman County, the largest racial and ethnic groups are White (57.4%), Hispanic or Latino (41.5%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Lyman County, South Dakota is 36.0 years. Residents are 47.8% female and 52.2% male.
The median home value in Lyman County is $156,500 and median monthly rent is $603. 72.2% of occupied housing units are owner-occupied. The county has 1,561 total housing units, 24.1% of which are vacant.
The largest employment sector in Lyman County, South Dakota is professional, scientific, and management services, employing 23.0% of workers. The unemployment rate is 2.1%.
Sioux Falls is among the largest cities associated with Lyman County, South Dakota, with a population of 197,642.
Lyman County, SD Climate
Lyman County, SD has an average annual temperature of 8.5°C (47°F) and receives about 473 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
8.5°C
Avg Temp
473
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -8° / 18° | 8 mm |
| February | -4° / 24° | 11 mm |
| March | 1° / 34° | 31 mm |
| April | 8° / 47° | 53 mm |
| May | 15° / 59° | 77 mm |
| June | 20° / 69° | 76 mm |
| July | 24° / 75° | 69 mm |
| August | 23° / 74° | 50 mm |
| September | 18° / 64° | 37 mm |
| October | 10° / 50° | 36 mm |
| November | 1° / 33° | 16 mm |
| December | -5° / 22° | 9 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Lyman County, SD
The most comfortable months to visit Lyman County, SD are typically June, August and September, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -14°C low). May is usually the wettest month.
Where to stay near Lyman County
Visiting or relocating to Lyman County, SD? Compare hotels and short-term rentals across the county — live availability and prices.
Top-rated places to stay near Lyman County
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a move to Lyman County?
Get relocation and cost-of-living insights for Lyman County, SD by email. No spam, unsubscribe anytime.
More from South Dakota
Population 200,689
Population 112,081
Population 68,286
Population 38,079
Full rankings of South Dakota counties
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.