Lyman County, South Dakota
Located in South Dakota, Lyman County has a population of 3,724 residents and a median age of 36.1 years, making it the #2,983 most populous county out of 3,222 nationwide. In terms of economic indicators, the county has a poverty rate of 23.7%. The median home value is $165,800, and the median household income is $67,143, which is 11% below the national median.
Demographics
Lyman County has a population of 3,724, making it the #2,983 most populous county in the US. The median age is 36.1 years, which is 7.2% below the national median.
Population Trend
Rankings →Year-over-Year Population Growth
Age & Sex Distribution
Race & Ethnicity
Nativity
Geographic Mobility (Past Year)
Economy
The median household income in Lyman County is $67,143, ranking #1,420 out of 3,222 counties — 10.7% below the national median. The poverty rate is 23.7% and unemployment stands at 4.0%.
Median Household Income Trend
Rankings →Income Distribution
Industry of Employment
Occupation
Housing
The median home value in Lyman County is $165,800 (-41.2% vs national). Renters pay a median of $651/mo and the homeownership rate is 69.9%.
Median Home Value Trend
Rankings →Household Type
Education
In Lyman County, 24.5% of adults age 25+ hold a bachelor's degree or higher, which is 27.2% below the national average, ranking #1,292 out of 3,222 counties.
Bachelor's Degree or Higher Trend
Rankings →Health & Wellbeing
Life expectancy in Lyman County is 68.3 years. 21.2% of adults report poor or fair health and 14.2% lack health insurance. Data from County Health Rankings (2025).
Life Expectancy Trend
Substance Use
23.6% of adults in Lyman County smoke , 39.9% are obese , and 20.2% report excessive drinking.
Adult Smoking Trend
Safety
The suicide rate is 65.6 per 100,000. Motor vehicle deaths occur at a rate of 40.7 per 100,000.
Suicide Rate Trend
Families & Children
26.0% of children in Lyman County live in poverty . The teen birth rate is 46.1 per 1,000 females age 15–19.
Teen Birth Rate Trend
Civic & Transportation
Voter turnout in Lyman County is 58.6%. The mean commute time is 18.1 min, which is 34.4% below the national average.
Voter Turnout Trend
Mean Commute Time Trend
Rankings →Elections
In the 2024 presidential election, Lyman County voted Republican with a margin of 39.4%. The vote was 29.2% Dem / 68.6% Rep. Compared to 2020, the margin shifted 7.1 toward Republicans .
Vote Share Over Time
About Lyman County, South Dakota
Lyman County, South Dakota has a total population of 3,724, making it the 2,983rd most populous county in the United States. The median age in Lyman County is 36.1 years, which is 7.2% below the national median of 38.9 years.
The median household income in Lyman County is $67,143, which ranks #1,420 of 3,222 counties nationwide. This is 10.7% below the national median of $75,149. The poverty rate is 23.7%, higher than the national rate of 12.6%. The unemployment rate stands at 4.0%.
The median home value in Lyman County is $165,800, 41.2% below the national median. Renters in Lyman County pay a median gross rent of $651 per month. The homeownership rate is 69.9%, compared to the national rate of 64.4%.
In Lyman County, 24.5% of residents aged 25 and older hold a bachelor's degree or higher, 27.2% below the national average of 33.7%. Health insurance coverage stands at 78.7% of the population. The average commute time for workers is 18.1 min.
Lyman County is a diverse community. The largest racial or ethnic group is White (non-Hispanic) at 57.1% of the population, followed by American Indian (non-Hispanic) (39.3%) and Two or More Races (2.0%).
All data for Lyman County, South Dakota comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates. These figures are estimates based on survey sampling and are subject to margin of error. For the most detailed and up-to-date data, visit the Census Bureau's official data portal.