Demographics of Mountrail County, North Dakota

Mountrail County, North Dakota had 9,395 people on July 1, 2025, by the Census Bureau’s estimate: −413 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.

Mountrail County, in four figures

9,395
Population: July 1, 2025, Vintage 2025 estimate.; −4.2%
Change since July 2020: −413 people.; 35.4 ±0.5
Median age: ACS 2020–⁠2024.; $80,717 ±$8,110
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.

Mountrail County, North Dakota's population shrank 4.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Mountrail 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

Mountrail County, North Dakota's population shrank 4.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Mountrail 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	9,808	100.0	100.0
2021	9,571	97.6	100.2
2022	9,249	94.3	100.7
2023	9,416	96.0	101.6
2024	9,475	96.6	102.5
2025	9,395	95.8	103.1

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Population of Mountrail 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	9,808	−9	+19	0	−29
2021	9,571	−237	+38	+2	−263
2022	9,249	−322	+45	+11	−397
2023	9,416	+167	+59	+32	+75
2024	9,475	+59	+47	+73	−62
2025	9,395	−80	+46	+28	−154

Age, 2020–2024

The median age is 35.4 ±0.5: for men 35.2 ±0.9 and for women 35.5 ±1.1. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Mountrail County by age, ACS 2020–2024
Age	People	Share	North Dakota	United States
Under 5	746 ±119	7.8% ±1.2	6.3% ±0.1	5.6% ±<0.1
5 to 17	2,014 ±251	21.2% ±2.6	17.2% ±0.3	16.3% ±<0.1
18 to 24	795 ±148	8.4% ±1.6	11.1% ±0.3	9.1% ±<0.1
25 to 44	2,470 ±207	26.0% ±2.2	27.4% ±0.3	26.9% ±<0.1
45 to 64	2,197 ±187	23.1% ±2.0	21.5% ±0.2	24.8% ±<0.1
65 and over	1,285 ±135	13.5% ±1.4	16.5% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $80,717 ±$8,110, and income per person $42,599 ±$4,489, 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 Mountrail County by income, ACS 2020–2024
Household income	Households	Share	North Dakota	United States
Under $25,000	597 ±137	15.3% ±3.4	14.4% ±0.5	14.6% ±<0.1
$25,000 to $49,999	693 ±165	17.8% ±4.2	17.9% ±0.6	16.7% ±<0.1
$50,000 to $74,999	543 ±142	13.9% ±3.6	16.6% ±0.5	15.5% ±<0.1
$75,000 to $99,999	487 ±114	12.5% ±2.9	13.9% ±0.4	12.6% ±<0.1
$100,000 to $149,999	803 ±161	20.6% ±4.0	18.6% ±0.6	17.5% ±<0.1
$150,000 to $199,999	382 ±115	9.8% ±2.9	9.0% ±0.4	9.6% ±<0.1
$200,000 or more	396 ±112	10.2% ±2.8	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 Mountrail County by age, ACS 2020–2024
Age	Below poverty	Rate	North Dakota	United States
All ages	1,363 ±329	14.5% ±3.5	10.8% ±0.4	12.5% ±0.1
Under 18	443 ±161	16.3% ±5.7	11.1% ±0.7	16.1% ±0.1
18 to 59	723 ±166	14.6% ±3.3	11.2% ±0.4	11.6% ±0.1
60 and over	197 ±65	11.5% ±3.7	9.5% ±0.5	11.0% ±<0.1

Housing, 2020–2024

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Housing in Mountrail County, ACS 2020–2024
Measure	Mountrail County	North Dakota	United States
Housing units	5,099 ±26	377,281 ±282	143,775,355 ±10,234
Occupied	76.5% ±3.2	87.7% ±0.4	89.9% ±0.1
Vacant	23.5% ±3.2	12.3% ±0.4	10.1% ±0.1
Owner occupied	61.5% ±3.5	62.9% ±0.6	65.2% ±0.3
Renter occupied	38.5% ±4.3	37.1% ±0.7	34.8% ±0.1
Median home value	$232,700 ±$21,614	$249,900 ±$2,909	$332,700 ±$236
Median gross rent	$950 ±$132	$954 ±$11	$1,413 ±$2
Median year built	1997 ±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 Mountrail County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	North Dakota	United States
Hispanic or Latino	819 ±0	8.6% ±<0.1	4.7% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	5,353 ±98	56.3% ±1.0	81.7% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	175 ±29	1.8% ±0.3	3.3% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	8 to 100	0.1% to 1.1%	1.6% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	2,692 ±133	28.3% ±1.4	4.2% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 36	0% to 0.4%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 15	0% to 0.2%	0.3% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	399 ±171	4.2% ±1.8	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 Mountrail County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	North Dakota	United States
Born in the state	5,677 ±405	59.7% ±4.3	61.4% ±0.4	57.3% ±<0.1
Born in another state	3,344 ±384	35.2% ±4.0	32.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	19 to 125	0.2% to 1.3%	1.1% ±0.1	1.7% ±<0.1
Born abroad	414 ±153	4.4% ±1.6	4.7% ±0.2	14.1% ±<0.1
Naturalized citizens	75 to 253	0.8% to 2.7%	1.9% ±0.1	7.4% ±<0.1
Not citizens	250 ±123	2.6% ±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%.

Mountrail County among the counties of North Dakota

16th of 53 by population, July 2025. Every one is listed on the North Dakota page.

Counties of North Dakota near Mountrail County in population, July 2025
County	July 2025	Change since 2020
Rolette County	11,688	−4.1%
Ramsey County	11,530	−0.4%
Barnes County	10,573	−2.7%
Walsh County	10,179	−3.4%
McLean County	9,740	−0.2%
Mountrail County	9,395	−4.2%
Mercer County	8,441	+1.1%
Traill County	7,920	−0.8%
Pembina County	6,568	−3.8%
Bottineau County	6,284	−1.6%
Benson County	5,759	−3.0%

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