Demographics of Sully County, South Dakota

Sully County, South Dakota had 1,479 people on July 1, 2025, by the Census Bureau’s estimate: +28 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Sully County, in four figures

1,479
Population: July 1, 2025, Vintage 2025 estimate.; +1.9%
Change since July 2020: +28 people.; 46.9 ±3.3
Median age: ACS 2020–⁠2024.; $72,578 ±$6,950
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Sully County, South Dakota's population grew 1.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Sully County, South Dakota's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Sully County, South Dakota's population grew 1.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Sully County, South Dakota's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	1,451	100.0	100.0
2021	1,474	101.6	100.2
2022	1,476	101.7	100.7
2023	1,485	102.3	101.6
2024	1,473	101.5	102.5
2025	1,479	101.9	103.1

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Population of Sully County, South Dakota on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	1,451	+4	+1	0	+2
2021	1,474	+23	+3	+1	+19
2022	1,476	+2	−5	+9	−2
2023	1,485	+9	+1	+3	+5
2024	1,473	−12	0	+8	−20
2025	1,479	+6	−1	+7	+1

Age, 2020–2024

The median age is 46.9 ±3.3: for men 46.4 ±3.9 and for women 47.5 ±3.8. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Sully County by age, ACS 2020–2024
Age	People	Share	South Dakota	United States
Under 5	57 ±21	3.7% ±1.4	6.3% ±0.1	5.6% ±<0.1
5 to 17	279 ±60	18.3% ±3.6	17.9% ±0.2	16.3% ±<0.1
18 to 24	101 ±48	6.6% ±3.1	9.3% ±0.4	9.1% ±<0.1
25 to 44	268 ±58	17.6% ±3.5	25.2% ±0.2	26.9% ±<0.1
45 to 64	468 ±57	30.7% ±2.7	23.3% ±0.2	24.8% ±<0.1
65 and over	353 ±51	23.1% ±2.7	18.0% ±0.3	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $72,578 ±$6,950, and income per person $46,134 ±$5,982, in 2024 dollars. The median is $75,081 ±$888 in South Dakota and $80,734 ±$166 in the United States.

Households by income

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Households in Sully County by income, ACS 2020–2024
Household income	Households	Share	South Dakota	United States
Under $25,000	85 ±29	13.3% ±4.4	14.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	88 ±30	13.8% ±4.5	18.5% ±0.5	16.7% ±<0.1
$50,000 to $74,999	161 ±47	25.3% ±7.0	17.4% ±0.4	15.5% ±<0.1
$75,000 to $99,999	67 ±21	10.5% ±3.1	14.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	127 ±31	19.9% ±4.5	18.9% ±0.5	17.5% ±<0.1
$150,000 to $199,999	60 ±25	9.4% ±3.8	8.5% ±0.3	9.6% ±<0.1
$200,000 or more	49 ±16	7.7% ±2.4	8.1% ±0.4	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Sully County by age, ACS 2020–2024
Age	Below poverty	Rate	South Dakota	United States
All ages	96 ±43	6.3% ±2.8	11.9% ±0.4	12.5% ±0.1
Under 18	0 to 17	0% to 5.2%	14.3% ±0.6	16.1% ±0.1
18 to 59	9 to 61	1.4% to 8.7%	11.8% ±0.5	11.6% ±0.1
60 and over	29 to 93	6.2% to 18.7%	9.7% ±0.4	11.0% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Housing, 2020–2024

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Housing in Sully County, ACS 2020–2024
Measure	Sully County	South Dakota	United States
Housing units	934 ±52	408,584 ±422	143,775,355 ±10,234
Occupied	68.2% ±5.2	89.5% ±0.4	89.9% ±0.1
Vacant	31.8% ±5.8	10.5% ±0.4	10.1% ±0.1
Owner occupied	72.8% ±2.3	68.6% ±0.5	65.2% ±0.3
Renter occupied	27.2% ±7.9	31.4% ±0.5	34.8% ±0.1
Median home value	$205,400 ±$32,262	$257,400 ±$3,051	$332,700 ±$236
Median gross rent	$842 ±$206	$946 ±$11	$1,413 ±$2
Median year built	1979 ±5	1980 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Sully County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	South Dakota	United States
Hispanic or Latino	0 to 10	0% to 0.7%	4.8% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	1,320 ±115	86.5% ±2.2	79.8% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 139	0% to 9.1%	2.1% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 10	0% to 0.7%	1.4% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 123	0% to 8.0%	7.1% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 10	0% to 0.7%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 13	0% to 0.9%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	23 to 119	1.5% to 7.8%	4.4% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Sully County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	South Dakota	United States
Born in the state	946 ±101	62.0% ±4.1	62.4% ±0.4	57.3% ±<0.1
Born in another state	506 ±114	33.2% ±6.9	32.9% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 4	0% to 0.3%	0.7% ±0.1	1.7% ±<0.1
Born abroad	4 to 142	0.3% to 9.3%	4.0% ±0.2	14.1% ±<0.1
Naturalized citizens	0 to 7	0% to 0.5%	1.7% ±0.1	7.4% ±<0.1
Not citizens	1 to 139	0.1% to 9.1%	2.3% ±0.2	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Sully County among the counties of South Dakota

62nd of 66 by population, July 2025. Every one is listed on the South Dakota page.

Counties of South Dakota near Sully County in population, July 2025
County	July 2025	Change since 2020
Faulk County	2,178	+2.3%
Mellette County	2,137	+11.5%
Buffalo County	1,802	−6.8%
Haakon County	1,802	−3.6%
Jerauld County	1,654	+0.6%
Sully County	1,479	+1.9%
Campbell County	1,377	−0.1%
Harding County	1,331	+2.1%
Hyde County	1,191	−4.6%
Jones County	913	−1.5%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026