Buffalo County, SD Demographics

Population 1,808 · Census ACS 2020–24

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

Household size in Buffalo County

Household size, people per household
PeriodBuffalo CountySouth DakotaU.S.
2006–103.832.512.68
2010–143.772.512.73
2015–193.602.502.71
2020–243.722.482.65
Change−0.12−0.03−0.03
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Buffalo County is a place of big households: 3.72 people per home on average, compared with 2.65 nationally. Numbers like that usually point to plenty of families with kids. Household size has dropped from 3.83 in 2006–10, but in a place this small, much of that may be survey noise rather than real change. Of South Dakota's 66 counties, only two 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 Buffalo County

Median age, years
PeriodBuffalo CountySouth DakotaU.S.
2006–1024.337.937.7
2010–1427.838.338.6
2015–1925.538.839.6
2020–2422.838.940.1
Change−1.6+1.0+2.3
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Buffalo County is young: half of its residents are under 22.8, compared with a national median of 40.1. The population tilts toward families with many children. Buffalo County has the youngest population of any South Dakota county.

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 Buffalo County

Single-parent households, % of households
PeriodBuffalo CountySouth DakotaU.S.
2006–1043.3%10.8%12.3%
2010–1430.6%11.1%12.3%
2015–1935.6%10.9%11.6%
2020–2434.1%10.7%11.6%
Change−9.2 pts−0.1 pts−0.6 pts
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Single parents head about a third of households in Buffalo County (34.1%), well above the national share of 11.6%. Only two of South Dakota's 66 counties have a higher share of single-parent households.

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 Buffalo County

Renters in Buffalo County

Renters, % of occupied homes
PeriodBuffalo CountySouth DakotaU.S.
2006–1071.4%31.1%33.3%
2010–1459.3%32.0%35.6%
2015–1953.7%32.0%36.0%
2020–2447.4%31.4%34.8%
Change−23.9 pts+0.3 pts+1.5 pts
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Renting is far more common in Buffalo County than nationally: 47.4% of households rent their homes, against 34.8%. Among homeowners, 95.6% have no mortgage at all, well above the national share of 39.8%. Of South Dakota's 66 counties, only three have a higher share of renters.

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 Buffalo County

Vacant homes, % of all homes
PeriodBuffalo CountySouth DakotaU.S.
2006–1013.3%11.3%11.4%
2010–1410.9%10.7%11.4%
2015–1914.1%11.6%11.1%
2020–2412.5%10.3%9.6%
Change−0.8 pts−1.1 pts−1.8 pts
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More homes sit empty in Buffalo County than nationally: 12.5%, against 9.6%. The count includes vacation homes and homes between owners or tenants, not just abandoned ones. Compared with other South Dakota counties, though, Buffalo County has a lower vacancy rate than most.

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 Buffalo County

Age of homes, median year built
PeriodBuffalo CountySouth DakotaU.S.
2006–10197819721974
2010–14198119741975
2015–19197719771977
2020–24197719811980
Change−1+9+6
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The typical home in Buffalo County was built around 1977, about the same vintage as the country's housing overall (1980). Homes here are older than in South Dakota overall, where the median home dates to 1981.

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 Buffalo County

Rent, per month
PeriodBuffalo CountySouth DakotaU.S.
2006–10$460$631$965
2010–14$576$692$1,040
2015–19$425$798$1,213
2020–24$597$1,000$1,571
Change+$137+$369+$606
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Rent in Buffalo County runs $597 a month at the median, utilities included, well below the U.S. median of $1,571. Rent takes 21.6% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent. Buffalo County has lower rents than at least four in five South Dakota counties.

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 Buffalo County

Bachelor's degrees in Buffalo County

Bachelor's degrees, % of adults 25+
PeriodBuffalo CountySouth DakotaU.S.
2006–108.2%26.8%28.4%
2010–148.7%27.8%29.6%
2015–198.5%29.4%32.1%
2020–2410.4%32.5%35.6%
Change+2.2 pts+5.6 pts+7.2 pts
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College degrees are relatively uncommon in Buffalo County: 10.4% of adults 25 and older hold a bachelor's or higher, well below the national share of 35.6%. Buffalo County has the lowest share of college graduates of any South Dakota county.

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 Buffalo County

High school graduates, % of adults 25+
PeriodBuffalo CountySouth DakotaU.S.
2006–1076.5%89.9%84.9%
2010–1479.8%91.0%86.1%
2015–1978.2%91.8%87.7%
2020–2488.0%93.1%89.3%
Change+11.5 pts+3.2 pts+4.3 pts
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High school completion in Buffalo County is close to the national rate: 88.0% of adults have a diploma or equivalent, against 89.3%. The rate is lower than in South Dakota overall (93.1%). Buffalo County has a lower share of high school graduates than at least four in five 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 Buffalo County

Unemployment, % of the labor force
PeriodBuffalo CountySouth DakotaU.S.
2006–1028.3%4.9%8.1%
2010–1414.8%4.9%9.4%
2015–1921.4%3.6%5.6%
2020–2411.2%3.1%5.4%
Change−17.2 pts−1.7 pts−2.7 pts
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Finding work has been harder in Buffalo County: 11.2% of the labor force was out of work and looking, well above the national rate of 5.4%. Of South Dakota's 66 counties, only six have higher unemployment. 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).

Buffalo County compared with nearby counties

CountyHousehold sizeMedian ageSingle parentsRentersVacant homesMedian year builtMedian rentBachelor's degreeHigh school diplomaUnemployment
Buffalo County3.7222.834.1%47.4%12.5%1977$59710.4%88.0%11.2%
Lyman County3.5436.817.8%30.1%22.4%1977$70822.8%87.8%4.7%
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%
Haakon County2.4247.00.8%20.8%23.2%1975$49521.1%96.4%0.0%
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%
Murray County2.2246.16.5%17.8%12.4%1960$83223.5%91.7%2.6%
Pennington County2.4140.710.2%30.7%10.8%1985$1,20234.6%94.4%3.2%

All figures 2020–24.

Counties with similar populations: Cameron Parish, LA · Crockett County, TX · Crane County, TX · Craig County, VA · Covington City, VA · Pendleton County, WV · Perkins County, NE · Cook County, MN · Powder River County, MT · Sierra County, CA

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 Buffalo 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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