Lyman County, SD Demographics

Population 3,724 · Census ACS 2020–24

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Median age by neighborhoodHistory and comparison ↓︎
Lyman County, SD map of median age by neighborhood
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Population and households in Lyman County

Household size in Lyman County

Household size, people per household
PeriodLyman CountySouth DakotaU.S.
2006–102.802.512.68
2010–142.862.512.73
2015–192.902.502.71
2020–243.542.482.65
Change+0.74−0.03−0.03
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Lyman County is a place of big households: 3.54 people per home on average, compared with 2.65 nationally. Numbers like that usually point to plenty of families with kids. Household size has climbed from 2.80 in 2006–10, but in a place this small, much of that may be survey noise rather than real change. Only four of South Dakota's 66 counties have larger households.

Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).

Median age in Lyman County

Median age, years
PeriodLyman CountySouth DakotaU.S.
2006–1035.637.937.7
2010–1437.338.338.6
2015–1937.238.839.6
2020–2436.838.940.1
Change+1.2+1.0+2.3
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Lyman County is younger than the country as a whole: its median age is 36.8, against 40.1 nationally. Lyman County is younger than most South Dakota counties.

Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).

Single-parent households in Lyman County

Single-parent households, % of households
PeriodLyman CountySouth DakotaU.S.
2006–1026.0%10.8%12.3%
2010–1419.4%11.1%12.3%
2015–1921.5%10.9%11.6%
2020–2417.8%10.7%11.6%
Change−8.2 pts−0.1 pts−0.6 pts
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Single parents head just over one in six households in Lyman County (17.8%), well above the national share of 11.6%. Lyman County has a higher share of single-parent households than the great majority of South Dakota counties.

Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).

Housing in Lyman County

Renters in Lyman County

Renters, % of occupied homes
PeriodLyman CountySouth DakotaU.S.
2006–1039.5%31.1%33.3%
2010–1432.3%32.0%35.6%
2015–1932.8%32.0%36.0%
2020–2430.1%31.4%34.8%
Change−9.4 pts+0.3 pts+1.5 pts
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About three in ten households in Lyman County rent their homes (30.1%), a little below the national share of 34.8%; the rest own. That is in line with the rest of South Dakota. About eight in ten owners (80.1%) have paid off their mortgages, well above the national share of 39.8%.

Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).

Vacant homes in Lyman County

Vacant homes, % of all homes
PeriodLyman CountySouth DakotaU.S.
2006–1012.8%11.3%11.4%
2010–1413.8%10.7%11.4%
2015–1917.2%11.6%11.1%
2020–2422.4%10.3%9.6%
Change+9.6 pts−1.1 pts−1.8 pts
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Vacant homes make up 22.4% of the housing in Lyman County, far above the national rate of 9.6%. In resort and lake areas that usually means seasonal and vacation homes; elsewhere it can point to weak demand. Lyman County has a higher vacancy rate than the great majority of South Dakota counties.

Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).

Age of homes in Lyman County

Age of homes, median year built
PeriodLyman CountySouth DakotaU.S.
2006–10197219721974
2010–14197319741975
2015–19197419771977
2020–24197719811980
Change+5+9+6
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The typical home in Lyman County was built around 1977, about the same vintage as the country's housing overall (1980). Compared with other South Dakota counties, Lyman County has newer homes than most.

Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).

Rent in Lyman County

Rent, per month
PeriodLyman CountySouth DakotaU.S.
2006–10$396$631$965
2010–14$491$692$1,040
2015–19$573$798$1,213
2020–24$708$1,000$1,571
Change+$312+$369+$606
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Rent in Lyman County runs $708 a month at the median, utilities included, well below the U.S. median of $1,571. Rent takes 16.8% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent.

Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).

Education in Lyman County

Bachelor's degrees in Lyman County

Bachelor's degrees, % of adults 25+
PeriodLyman CountySouth DakotaU.S.
2006–1018.0%26.8%28.4%
2010–1418.1%27.8%29.6%
2015–1918.1%29.4%32.1%
2020–2422.8%32.5%35.6%
Change+4.8 pts+5.6 pts+7.2 pts
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Fewer adults in Lyman County have a four-year degree than in the country as a whole: 22.8%, against 35.6% nationally.

Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).

High school graduates in Lyman County

High school graduates, % of adults 25+
PeriodLyman CountySouth DakotaU.S.
2006–1085.2%89.9%84.9%
2010–1488.1%91.0%86.1%
2015–1988.2%91.8%87.7%
2020–2487.8%93.1%89.3%
Change+2.5 pts+3.2 pts+4.3 pts
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High school completion in Lyman County is close to the national rate: 87.8% of adults have a diploma or equivalent, against 89.3%. The rate is lower than in South Dakota as a whole (93.1%). Lyman County has a lower share of high school graduates than the great majority of South Dakota counties.

High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).

Jobs in Lyman County

Unemployment, % of the labor force
PeriodLyman CountySouth DakotaU.S.
2006–1012.9%4.9%8.1%
2010–1410.2%4.9%9.4%
2015–199.1%3.6%5.6%
2020–244.7%3.1%5.4%
Change−8.2 pts−1.7 pts−2.7 pts
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Unemployment in Lyman County runs below the national rate: 4.7% of the labor force was out of work and looking, against 5.4% nationally. Even so, the rate is higher than in South Dakota as a whole (3.1%). Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.

Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).

Lyman County compared with nearby counties

CountyHousehold sizeMedian ageSingle parentsRentersVacant homesMedian year builtMedian rentBachelor's degreeHigh school diplomaUnemployment
Lyman County3.5436.817.8%30.1%22.4%1977$70822.8%87.8%4.7%
Buffalo County3.7222.834.1%47.4%12.5%1977$59710.4%88.0%11.2%
Jones County2.9433.912.3%23.7%28.6%1973$54327.4%93.2%2.1%
Jerauld County2.2050.86.4%15.9%18.5%1958$73721.5%93.5%1.6%
Sanborn County2.5139.74.0%21.4%19.5%1958$77821.8%89.1%0.6%
Miner County2.4248.16.9%15.2%16.9%1954$63816.4%94.9%0.2%
Lake County2.2545.07.5%26.2%16.3%1970$94535.3%93.5%3.1%
Moody County2.5041.19.8%26.5%6.8%1971$86431.6%95.3%2.6%
Pipestone County2.3440.68.8%19.2%8.7%1955$77522.0%92.6%3.0%
Pennington County2.4140.710.2%30.7%10.8%1985$1,20234.6%94.4%3.2%
Murray County2.2246.16.5%17.8%12.4%1960$83223.5%91.7%2.6%

All figures 2020–24.

Counties with similar populations: Cochran County, TX · Todd County, KY · Tillman County, OK · Thurston County, NE · Throckmorton County, TX · Thomas County, NE · Comanche County, KS · Collingsworth County, TX · Coke County, TX · Todd County, SD

About these numbers

Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Lyman County. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.

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