Demographics of Williams County, North Dakota

Williams County, North Dakota had 41,767 people on July 1, 2025, by the Census Bureau’s estimate: +577 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.

Williams County, in four figures

41,767
Population: July 1, 2025, Vintage 2025 estimate.; +1.4%
Change since July 2020: +577 people.; 31.8 ±0.5
Median age: ACS 2020–⁠2024.; $85,595 ±$6,424
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.

Williams County, North Dakota's population grew 1.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Williams 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

Williams County, North Dakota's population grew 1.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Williams 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	41,190	100.0	100.0
2021	38,508	93.5	100.2
2022	37,954	92.1	100.7
2023	39,233	95.2	101.6
2024	40,755	98.9	102.5
2025	41,767	101.4	103.1

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Population of Williams County, North Dakota on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	41,190	+238	+156	+2	+74
2021	38,508	−2,682	+461	+34	−2,949
2022	37,954	−554	+334	+85	−1,012
2023	39,233	+1,279	+464	+131	+676
2024	40,755	+1,522	+486	+246	+782
2025	41,767	+1,012	+506	+154	+352

Age, 2020–2024

The median age is 31.8 ±0.5: for men 31.9 ±1.0 and for women 31.8 ±0.8. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Williams County by age, ACS 2020–2024
Age	People	Share	North Dakota	United States
Under 5	3,344 ±197	8.5% ±0.5	6.3% ±0.1	5.6% ±<0.1
5 to 17	8,590 ±750	21.7% ±1.9	17.2% ±0.3	16.3% ±<0.1
18 to 24	3,080 ±423	7.8% ±1.1	11.1% ±0.3	9.1% ±<0.1
25 to 44	13,471 ±932	34.1% ±2.4	27.4% ±0.3	26.9% ±<0.1
45 to 64	7,136 ±574	18.0% ±1.4	21.5% ±0.2	24.8% ±<0.1
65 and over	3,934 ±507	9.9% ±1.3	16.5% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $85,595 ±$6,424, and income per person $44,320 ±$2,818, 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 Williams County by income, ACS 2020–2024
Household income	Households	Share	North Dakota	United States
Under $25,000	1,411 ±363	9.3% ±2.4	14.4% ±0.5	14.6% ±<0.1
$25,000 to $49,999	2,794 ±614	18.4% ±3.9	17.9% ±0.6	16.7% ±<0.1
$50,000 to $74,999	2,496 ±553	16.5% ±3.6	16.6% ±0.5	15.5% ±<0.1
$75,000 to $99,999	2,205 ±493	14.6% ±3.2	13.9% ±0.4	12.6% ±<0.1
$100,000 to $149,999	2,408 ±554	15.9% ±3.6	18.6% ±0.6	17.5% ±<0.1
$150,000 to $199,999	1,717 ±373	11.3% ±2.4	9.0% ±0.4	9.6% ±<0.1
$200,000 or more	2,123 ±452	14.0% ±2.9	9.6% ±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 Williams County by age, ACS 2020–2024
Age	Below poverty	Rate	North Dakota	United States
All ages	3,379 ±885	8.6% ±2.3	10.8% ±0.4	12.5% ±0.1
Under 18	1,215 ±461	10.2% ±3.8	11.1% ±0.7	16.1% ±0.1
18 to 59	1,437 ±396	6.7% ±1.8	11.2% ±0.4	11.6% ±0.1
60 and over	324 to 1,130	5.9% to 19.9%	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 Williams County, ACS 2020–2024
Measure	Williams County	North Dakota	United States
Housing units	20,376 ±57	377,281 ±282	143,775,355 ±10,234
Occupied	74.4% ±3.7	87.7% ±0.4	89.9% ±0.1
Vacant	25.6% ±3.8	12.3% ±0.4	10.1% ±0.1
Owner occupied	53.0% ±2.6	62.9% ±0.6	65.2% ±0.3
Renter occupied	47.0% ±4.9	37.1% ±0.7	34.8% ±0.1
Median home value	$284,800 ±$24,004	$249,900 ±$2,909	$332,700 ±$236
Median gross rent	$1,123 ±$56	$954 ±$11	$1,413 ±$2
Median year built	2001 ±5	1982 ±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 Williams County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	North Dakota	United States
Hispanic or Latino	4,028 ±0	10.2% ±<0.1	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	29,931 ±159	75.7% ±0.4	81.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	1,858 ±269	4.7% ±0.7	3.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	481 ±144	1.2% ±0.4	1.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	1,022 ±306	2.6% ±0.8	4.2% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 109	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	31 to 213	0.1% to 0.5%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	2,063 ±445	5.2% ±1.1	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 Williams County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	North Dakota	United States
Born in the state	16,957 ±1,387	42.9% ±3.5	61.4% ±0.4	57.3% ±<0.1
Born in another state	18,662 ±1,503	47.2% ±3.8	32.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	78 to 1,066	0.2% to 2.7%	1.1% ±0.1	1.7% ±<0.1
Born abroad	3,364 ±671	8.5% ±1.7	4.7% ±0.2	14.1% ±<0.1
Naturalized citizens	1,366 ±521	3.5% ±1.3	1.9% ±0.1	7.4% ±<0.1
Not citizens	1,998 ±597	5.1% ±1.5	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%.

Williams County among the counties of North Dakota

5th of 53 by population, July 2025. Every one is listed on the North Dakota page.

Counties of North Dakota near Williams County in population, July 2025
County	July 2025	Change since 2020
Cass County	201,794	+9.1%
Burleigh County	103,251	+4.7%
Grand Forks County	74,501	+1.9%
Ward County	68,233	−2.4%
Williams County	41,767	+1.4%
Morton County	34,601	+3.8%
Stark County	34,013	+0.5%
Stutsman County	21,414	−0.6%
Richland County	16,731	+1.2%
McKenzie County	15,192	+2.8%

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