Demographics of Lake County, Montana

Lake County, Montana had 33,392 people on July 1, 2025, by the Census Bureau’s estimate: +2,147 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.

Lake County, in four figures

33,392
Population: July 1, 2025, Vintage 2025 estimate.; +6.9%
Change since July 2020: +2,147 people.; 44.3 ±0.3
Median age: ACS 2020–⁠2024.; $63,360 ±$3,063
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.

Lake County, Montana's population grew 6.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Lake County, Montana'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

Lake County, Montana's population grew 6.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Lake County, Montana'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	31,245	100.0	100.0
2021	32,072	102.6	100.2
2022	32,801	105.0	100.7
2023	33,206	106.3	101.6
2024	33,383	106.8	102.5
2025	33,392	106.9	103.1

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Population of Lake County, Montana on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	31,245	+110	−13	0	+132
2021	32,072	+827	−72	+17	+931
2022	32,801	+729	−83	+3	+763
2023	33,206	+405	−88	−1	+488
2024	33,383	+177	−80	+40	+217
2025	33,392	+9	−78	−7	+90

Age, 2020–2024

The median age is 44.3 ±0.3: for men 43.1 ±0.7 and for women 44.9 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Lake County by age, ACS 2020–2024
Age	People	Share	Montana	United States
Under 5	1,587 ±48	4.9% ±0.1	5.2% ±<0.1	5.6% ±<0.1
5 to 17	5,580 ±325	17.1% ±1.0	15.8% ±0.2	16.3% ±<0.1
18 to 24	2,305 ±238	7.1% ±0.7	9.0% ±0.2	9.1% ±<0.1
25 to 44	7,118 ±271	21.9% ±0.8	25.8% ±0.2	26.9% ±<0.1
45 to 64	8,077 ±346	24.8% ±1.1	24.1% ±0.2	24.8% ±<0.1
65 and over	7,894 ±363	24.2% ±1.1	20.1% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $63,360 ±$3,063, and income per person $36,177 ±$2,090, in 2024 dollars. The median is $72,509 ±$761 in Montana and $80,734 ±$166 in the United States.

Households by income

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Households in Lake County by income, ACS 2020–2024
Household income	Households	Share	Montana	United States
Under $25,000	2,635 ±276	21.0% ±2.2	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	2,338 ±264	18.6% ±2.1	19.4% ±0.5	16.7% ±<0.1
$50,000 to $74,999	2,190 ±258	17.4% ±2.0	17.3% ±0.4	15.5% ±<0.1
$75,000 to $99,999	1,783 ±223	14.2% ±1.8	13.6% ±0.4	12.6% ±<0.1
$100,000 to $149,999	1,842 ±232	14.6% ±1.8	17.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	798 ±163	6.3% ±1.3	8.2% ±0.3	9.6% ±<0.1
$200,000 or more	990 ±144	7.9% ±1.1	9.0% ±0.3	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 Lake County by age, ACS 2020–2024
Age	Below poverty	Rate	Montana	United States
All ages	5,551 ±746	17.2% ±2.3	11.5% ±0.3	12.5% ±0.1
Under 18	1,613 ±308	23.0% ±4.1	12.7% ±0.6	16.1% ±0.1
18 to 59	2,473 ±356	16.9% ±2.4	11.7% ±0.4	11.6% ±0.1
60 and over	1,465 ±201	13.9% ±1.8	10.3% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Lake County, ACS 2020–2024
Measure	Lake County	Montana	United States
Housing units	16,468 ±35	528,419 ±3,257	143,775,355 ±10,234
Occupied	76.4% ±1.5	86.8% ±0.5	89.9% ±0.1
Vacant	23.6% ±1.5	13.2% ±0.3	10.1% ±0.1
Owner occupied	75.0% ±1.6	69.2% ±0.6	65.2% ±0.3
Renter occupied	25.0% ±2.1	30.8% ±0.4	34.8% ±0.1
Median home value	$421,800 ±$19,570	$375,800 ±$3,433	$332,700 ±$236
Median gross rent	$901 ±$42	$1,081 ±$14	$1,413 ±$2
Median year built	1986 ±2	1981 ±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 Lake County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Montana	United States
Hispanic or Latino	1,397 ±0	4.3% ±<0.1	4.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	21,037 ±223	64.6% ±0.7	83.6% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	32 to 110	0.1% to 0.3%	0.4% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	215 ±53	0.7% ±0.2	0.8% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	6,376 ±440	19.6% ±1.4	5.3% ±0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	58 ±12	0.2% ±<0.1	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	17 to 149	0.1% to 0.5%	0.5% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	3,324 ±450	10.2% ±1.4	4.7% ±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 Lake County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Montana	United States
Born in the state	17,240 ±668	52.9% ±2.1	52.1% ±0.5	57.3% ±<0.1
Born in another state	14,317 ±622	44.0% ±1.9	44.8% ±0.4	26.9% ±<0.1
Born a citizen outside the states	246 ±88	0.8% ±0.3	0.8% ±0.1	1.7% ±<0.1
Born abroad	758 ±158	2.3% ±0.5	2.3% ±0.1	14.1% ±<0.1
Naturalized citizens	430 ±112	1.3% ±0.3	1.2% ±0.1	7.4% ±<0.1
Not citizens	328 ±112	1.0% ±0.3	1.1% ±0.1	6.8% ±<0.1

Lake County among the counties of Montana

9th of 56 by population, July 2025. Every one is listed on the Montana page.

Counties of Montana near Lake County in population, July 2025
County	July 2025	Change since 2020
Flathead County	115,429	+10.1%
Cascade County	85,029	+0.7%
Lewis and Clark County	75,331	+5.8%
Ravalli County	48,582	+9.4%
Silver Bow County	36,118	+2.6%
Lake County	33,392	+6.9%
Lincoln County	22,328	+13.1%
Park County	18,214	+5.7%
Hill County	16,167	−0.5%
Sanders County	14,062	+12.9%
Glacier County	13,463	−2.0%

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