Demographics of Foster County, North Dakota

Foster County, North Dakota had 3,212 people on July 1, 2025, by the Census Bureau’s estimate: −172 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.

Foster County, in four figures

3,212
Population: July 1, 2025, Vintage 2025 estimate.; −5.1%
Change since July 2020: −172 people.; 43.4 ±2.9
Median age: ACS 2020–⁠2024.; $87,831 ±$10,924
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.

Foster County, North Dakota's population shrank 5.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Foster 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

Foster County, North Dakota's population shrank 5.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Foster 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	3,384	100.0	100.0
2021	3,361	99.3	100.2
2022	3,373	99.7	100.7
2023	3,308	97.8	101.6
2024	3,273	96.7	102.5
2025	3,212	94.9	103.1

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Population of Foster 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	3,384	−8	+2	0	−9
2021	3,361	−23	−13	0	−10
2022	3,373	+12	−12	0	+24
2023	3,308	−65	−14	+16	−67
2024	3,273	−35	−14	+18	−39
2025	3,212	−61	−16	+18	−61

Age, 2020–2024

The median age is 43.4 ±2.9: for men 41.6 ±1.0 and for women 48.8 ±1.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Foster County by age, ACS 2020–2024
Age	People	Share	North Dakota	United States
Under 5	195 ±26	5.8% ±0.8	6.3% ±0.1	5.6% ±<0.1
5 to 17	536 ±78	16.0% ±2.3	17.2% ±0.3	16.3% ±<0.1
18 to 24	121 ±42	3.6% ±1.2	11.1% ±0.3	9.1% ±<0.1
25 to 44	846 ±101	25.2% ±3.0	27.4% ±0.3	26.9% ±<0.1
45 to 64	850 ±89	25.3% ±2.6	21.5% ±0.2	24.8% ±<0.1
65 and over	810 ±108	24.1% ±3.2	16.5% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $87,831 ±$10,924, and income per person $46,993 ±$4,884, 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 Foster County by income, ACS 2020–2024
Household income	Households	Share	North Dakota	United States
Under $25,000	275 ±81	18.0% ±5.2	14.4% ±0.5	14.6% ±<0.1
$25,000 to $49,999	170 ±58	11.1% ±3.7	17.9% ±0.6	16.7% ±<0.1
$50,000 to $74,999	220 ±78	14.4% ±5.0	16.6% ±0.5	15.5% ±<0.1
$75,000 to $99,999	209 ±55	13.7% ±3.5	13.9% ±0.4	12.6% ±<0.1
$100,000 to $149,999	342 ±82	22.3% ±5.2	18.6% ±0.6	17.5% ±<0.1
$150,000 to $199,999	136 ±57	8.9% ±3.7	9.0% ±0.4	9.6% ±<0.1
$200,000 or more	179 ±63	11.7% ±4.1	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 Foster County by age, ACS 2020–2024
Age	Below poverty	Rate	North Dakota	United States
All ages	286 ±87	8.8% ±2.7	10.8% ±0.4	12.5% ±0.1
Under 18	5 to 67	0.7% to 9.3%	11.1% ±0.7	16.1% ±0.1
18 to 59	103 ±49	6.6% ±3.1	11.2% ±0.4	11.6% ±0.1
60 and over	147 ±64	14.9% ±6.3	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 Foster County, ACS 2020–2024
Measure	Foster County	North Dakota	United States
Housing units	1,775 ±29	377,281 ±282	143,775,355 ±10,234
Occupied	86.3% ±4.5	87.7% ±0.4	89.9% ±0.1
Vacant	13.7% ±4.8	12.3% ±0.4	10.1% ±0.1
Owner occupied	79.7% ±3.7	62.9% ±0.6	65.2% ±0.3
Renter occupied	20.3% ±4.8	37.1% ±0.7	34.8% ±0.1
Median home value	$167,500 ±$27,475	$249,900 ±$2,909	$332,700 ±$236
Median gross rent	$780 ±$70	$954 ±$11	$1,413 ±$2
Median year built	1973 ±2	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 Foster County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	North Dakota	United States
Hispanic or Latino	1 to 113	< 0.1% to 3.4%	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,126 ±21	93.1% ±0.6	81.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 24	0% to 0.7%	3.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	12 to 110	0.4% to 3.3%	1.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 14	0% to 0.4%	4.2% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 10	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 35	0% to 1.0%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	39 to 131	1.2% to 3.9%	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 Foster County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	North Dakota	United States
Born in the state	2,468 ±147	73.5% ±4.4	61.4% ±0.4	57.3% ±<0.1
Born in another state	803 ±141	23.9% ±4.2	32.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	0 to 42	0% to 1.3%	1.1% ±0.1	1.7% ±<0.1
Born abroad	17 to 115	0.5% to 3.4%	4.7% ±0.2	14.1% ±<0.1
Naturalized citizens	0 to 34	0% to 1.0%	1.9% ±0.1	7.4% ±<0.1
Not citizens	7 to 95	0.2% to 2.8%	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%.

Foster County among the counties of North Dakota

33rd of 53 by population, July 2025. Every one is listed on the North Dakota page.

Counties of North Dakota near Foster County in population, July 2025
County	July 2025	Change since 2020
Wells County	3,729	−5.9%
Sargent County	3,711	−3.4%
Sioux County	3,667	−5.4%
Cavalier County	3,497	−5.4%
Emmons County	3,215	−2.4%
Foster County	3,212	−5.1%
Nelson County	2,963	−1.0%
Bowman County	2,762	−7.1%
Hettinger County	2,492	+0.4%
McIntosh County	2,451	−2.5%
Kidder County	2,393	+0.5%

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