Population 1,526 · Census ACS 2020–24
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Population and households in Sully County
Household size in Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 2.26 | 2.51 | 2.68 |
| 2010–14 | 2.39 | 2.51 | 2.73 |
| 2015–19 | 2.28 | 2.50 | 2.71 |
| 2020–24 | 2.41 | 2.48 | 2.65 |
| Change | +0.15 | −0.03 | −0.03 |
Households in Sully County run small, averaging 2.41 people against 2.65 nationally, which usually means more singles and couples and fewer children. That is in line with the rest of South Dakota. Since 2006–10, household size has climbed from 2.26, but in a place this small, much of that may be survey noise rather than real change.
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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 47.1 | 37.9 | 37.7 |
| 2010–14 | 43.7 | 38.3 | 38.6 |
| 2015–19 | 47.3 | 38.8 | 39.6 |
| 2020–24 | 46.1 | 38.9 | 40.1 |
| Change | −0.9 | +1.0 | +2.3 |
Sully County skews older: half of its residents are older than 46.1, well above the national median of 40.1. That usually means more empty nesters and retirees, and fewer young families. Sully County is older than at least four in five 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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 8.3% | 10.8% | 12.3% |
| 2010–14 | 4.7% | 11.1% | 12.3% |
| 2015–19 | 9.8% | 10.9% | 11.6% |
| 2020–24 | 4.0% | 10.7% | 11.6% |
| Change | −4.3 pts | −0.1 pts | −0.6 pts |
Single parents head only 4.0% of households in Sully County, well below the national share of 11.6%. Sully County has a lower share of single-parent households than at least four in five 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 Sully County
Renters in Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 21.5% | 31.1% | 33.3% |
| 2010–14 | 27.2% | 32.0% | 35.6% |
| 2015–19 | 14.1% | 32.0% | 36.0% |
| 2020–24 | 27.2% | 31.4% | 34.8% |
| Change | +5.7 pts | +0.3 pts | +1.5 pts |
More than a quarter of households in Sully County rent their homes (27.2%), below the national share of 34.8%; the rest own. Among homeowners, 65.9% have no mortgage at all, 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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 28.4% | 11.3% | 11.4% |
| 2010–14 | 23.3% | 10.7% | 11.4% |
| 2015–19 | 26.8% | 11.6% | 11.1% |
| 2020–24 | 31.5% | 10.3% | 9.6% |
| Change | +3.1 pts | −1.1 pts | −1.8 pts |
Vacancy is high in Sully County: 31.5% of homes are empty, 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. Only one other South Dakota county has a higher vacancy rate.
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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 1968 | 1972 | 1974 |
| 2010–14 | 1971 | 1974 | 1975 |
| 2015–19 | 1972 | 1977 | 1977 |
| 2020–24 | 1983 | 1981 | 1980 |
| Change | +14 | +9 | +6 |
Homes in Sully County are about the same age as the nation's housing: the median home was built in 1983, versus 1980 nationally. Sully County has newer homes than the great majority of South Dakota counties.
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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | $461 | $631 | $965 |
| 2010–14 | $578 | $692 | $1,040 |
| 2015–19 | $571 | $798 | $1,213 |
| 2020–24 | $790 | $1,000 | $1,571 |
| Change | +$329 | +$369 | +$606 |
A typical rental in Sully County costs $790 a month with utilities, well below the national median of $1,571. The typical renter here spends 22.8% of household income on rent, comfortably under the 30% mark often used to define affordable rent, and a smaller share than renters pay nationally.
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 Sully County
Bachelor's degrees in Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 25.1% | 26.8% | 28.4% |
| 2010–14 | 26.4% | 27.8% | 29.6% |
| 2015–19 | 25.1% | 29.4% | 32.1% |
| 2020–24 | 23.8% | 32.5% | 35.6% |
| Change | −1.3 pts | +5.6 pts | +7.2 pts |
Fewer adults in Sully County have a four-year degree than in the country as a whole: 23.8%, 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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 92.0% | 89.9% | 84.9% |
| 2010–14 | 91.2% | 91.0% | 86.1% |
| 2015–19 | 95.6% | 91.8% | 87.7% |
| 2020–24 | 96.2% | 93.1% | 89.3% |
| Change | +4.1 pts | +3.2 pts | +4.3 pts |
High school completion is high in Sully County: 96.2% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. Only five of South Dakota's 66 counties have a higher share of high school graduates.
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 Sully County
| Period | Sully County | South Dakota | U.S. |
|---|---|---|---|
| 2006–10 | 1.2% | 4.9% | 8.1% |
| 2010–14 | 2.6% | 4.9% | 9.4% |
| 2015–19 | 0.5% | 3.6% | 5.6% |
| 2020–24 | 0.0% | 3.1% | 5.4% |
| Change | −1.2 pts | −1.7 pts | −2.7 pts |
The survey found almost no one in Sully County out of work and looking, against 5.4% of the labor force nationally. Only one other South Dakota county has lower unemployment. Each figure pools five years of surveys (2020–24), so it describes that whole stretch rather than today's 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).
Sully County compared with nearby counties
| County | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Sully County | 2.41 | 46.1 | 4.0% | 27.2% | 31.5% | 1983 | $790 | 23.8% | 96.2% | 0.0% |
| Clark County | 2.91 | 39.5 | 5.8% | 22.5% | 16.6% | 1957 | $754 | 20.8% | 91.1% | 3.6% |
| Hamlin County | 2.84 | 32.5 | 6.1% | 18.0% | 18.4% | 1968 | $906 | 24.2% | 91.8% | 0.5% |
| Deuel County | 2.43 | 44.1 | 6.6% | 17.2% | 16.4% | 1965 | $615 | 25.1% | 93.3% | 2.0% |
| Butte County | 2.47 | 41.5 | 10.5% | 23.9% | 11.2% | 1983 | $923 | 21.0% | 90.4% | 2.2% |
| Yellow Medicine County | 2.27 | 43.4 | 8.9% | 16.0% | 9.8% | 1956 | $787 | 19.8% | 93.0% | 3.6% |
| Renville County | 2.35 | 43.8 | 9.4% | 19.8% | 12.3% | 1959 | $799 | 18.2% | 91.7% | 2.5% |
| McLeod County | 2.40 | 42.5 | 9.2% | 22.6% | 5.5% | 1978 | $947 | 20.1% | 93.6% | 3.4% |
| Carver County | 2.72 | 39.9 | 9.4% | 18.5% | 3.5% | 1996 | $1,620 | 50.9% | 96.9% | 3.0% |
| Scott County | 2.87 | 38.8 | 10.0% | 16.2% | 4.3% | 1994 | $1,736 | 44.4% | 94.5% | 3.5% |
| Sheridan County | 2.33 | 42.6 | 5.9% | 29.3% | 9.3% | 1982 | $909 | 30.8% | 96.2% | 2.0% |
All figures 2020–24.
Counties with similar populations: Butler County, NE · Washita County, OK · Washington County, NC · Washington County, KS · Washington County, ID · Washington County, CO · Washakie County, WY · Warren County, IN · Warren County, GA · Walworth 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 Sully 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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