Demographics of Slope County, North Dakota

Slope County, North Dakota had 628 people on July 1, 2025, by the Census Bureau’s estimate: −69 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.

Slope County, in four figures

628
Population: July 1, 2025, Vintage 2025 estimate.; −9.9%
Change since July 2020: −69 people.; 54.1 ±3.4
Median age: ACS 2020–⁠2024.; $71,250 ±$16,084
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.

Slope County, North Dakota's population shrank 9.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Slope County, North 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

Slope County, North Dakota's population shrank 9.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Slope County, North 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	697	100.0	100.0
2021	688	98.7	100.2
2022	678	97.3	100.7
2023	668	95.8	101.6
2024	644	92.4	102.5
2025	628	90.1	103.1

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Population of Slope County, North Dakota on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From elsewhere in the country
2020	697	−4	−2	−2
2021	688	−9	+5	−13
2022	678	−10	+4	−15
2023	668	−10	0	−10
2024	644	−24	−1	−23
2025	628	−16	−1	−15

Age, 2020–2024

The median age is 54.1 ±3.4: for men 54.2 ±5.6 and for women 54.0 ±9.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Slope County by age, ACS 2020–2024
Age	People	Share	North Dakota	United States
Under 5	5 to 25	0.7% to 3.2%	6.3% ±0.1	5.6% ±<0.1
5 to 17	107 ±26	14.0% ±3.1	17.2% ±0.3	16.3% ±<0.1
18 to 24	5 to 81	0.7% to 10.5%	11.1% ±0.3	9.1% ±<0.1
25 to 44	149 ±37	19.5% ±4.3	27.4% ±0.3	26.9% ±<0.1
45 to 64	232 ±45	30.3% ±4.9	21.5% ±0.2	24.8% ±<0.1
65 and over	220 ±39	28.7% ±4.1	16.5% ±0.2	17.2% ±<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%.

Income and poverty, 2020–2024

Median household income is $71,250 ±$16,084, and income per person $47,169 ±$6,322, in 2024 dollars. The median is $76,657 ±$1,163 in North Dakota and $80,734 ±$166 in the United States.

Households by income

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Households in Slope County by income, ACS 2020–2024
Household income	Households	Share	North Dakota	United States
Under $25,000	92 ±38	24.6% ±9.8	14.4% ±0.5	14.6% ±<0.1
$25,000 to $49,999	20 to 60	10.7% ±5.2	17.9% ±0.6	16.7% ±<0.1
$50,000 to $74,999	61 ±25	16.3% ±6.6	16.6% ±0.5	15.5% ±<0.1
$75,000 to $99,999	64 ±20	17.1% ±5.0	13.9% ±0.4	12.6% ±<0.1
$100,000 to $149,999	47 ±22	12.6% ±5.9	18.6% ±0.6	17.5% ±<0.1
$150,000 to $199,999	14 to 56	3.8% to 14.9%	9.0% ±0.4	9.6% ±<0.1
$200,000 or more	35 ±14	9.4% ±3.6	9.6% ±0.4	13.4% ±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%.

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 Slope County by age, ACS 2020–2024
Age	Below poverty	Rate	North Dakota	United States
All ages	15 to 61	2.0% to 7.9%	10.8% ±0.4	12.5% ±0.1
Under 18	0 to 17	0% to 14.2%	11.1% ±0.7	16.1% ±0.1
18 to 59	0 to 3	0% to 0.9%	11.2% ±0.4	11.6% ±0.1
60 and over	14 to 60	5.0% to 19.2%	9.5% ±0.5	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 Slope County, ACS 2020–2024
Measure	Slope County	North Dakota	United States
Housing units	456 ±40	377,281 ±282	143,775,355 ±10,234
Occupied	82.0% ±4.6	87.7% ±0.4	89.9% ±0.1
Vacant	18.0% ±6.2	12.3% ±0.4	10.1% ±0.1
Owner occupied	80.7% ±7.4	62.9% ±0.6	65.2% ±0.3
Renter occupied	19.3% ±8.9	37.1% ±0.7	34.8% ±0.1
Median home value	$71,809 to $268,191	$249,900 ±$2,909	$332,700 ±$236
Median gross rent	$189 to $861	$954 ±$11	$1,413 ±$2
Median year built	1961 ±14	1982 ±1	1980 ±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%.

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 Slope County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	North Dakota	United States
Hispanic or Latino	0 to 3	0% to 0.4%	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	708 ±82	92.4% ±3.8	81.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 10	0% to 1.3%	3.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 10	0% to 1.3%	1.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 10	0% to 1.3%	4.2% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 10	0% to 1.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 13	0% to 1.7%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	18 to 84	2.4% to 10.9%	4.0% ±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 Slope County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	North Dakota	United States
Born in the state	533 ±75	69.6% ±6.2	61.4% ±0.4	57.3% ±<0.1
Born in another state	222 ±52	29.0% ±6.0	32.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 14	< 0.1% to 1.8%	1.1% ±0.1	1.7% ±<0.1
Born abroad	0 to 9	0% to 1.2%	4.7% ±0.2	14.1% ±<0.1
Naturalized citizens	0 to 9	0% to 1.2%	1.9% ±0.1	7.4% ±<0.1
Not citizens	0 to 10	0% to 1.3%	2.8% ±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%.

Slope County among the counties of North Dakota

53rd of 53 by population, July 2025. Every one is listed on the North Dakota page.

Counties of North Dakota near Slope County in population, July 2025
County	July 2025	Change since 2020
Logan County	1,859	−1.3%
Golden Valley County	1,808	+4.8%
Steele County	1,797	−0.1%
Sheridan County	1,296	+2.7%
Billings County	1,071	+15.2%
Slope County	628	−9.9%

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