Demographics of Custer County, Idaho

Custer County, Idaho had 4,636 people on July 1, 2025, by the Census Bureau’s estimate: +367 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.

Custer County, in four figures

4,636
Population: July 1, 2025, Vintage 2025 estimate.; +8.6%
Change since July 2020: +367 people.; 60.0 ±3.5
Median age: ACS 2020–⁠2024.; $67,574 ±$16,035
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.

Custer County, Idaho's population grew 8.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Custer County, Idaho'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

Custer County, Idaho's population grew 8.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Custer County, Idaho'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	4,269	100.0	100.0
2021	4,445	104.1	100.2
2022	4,503	105.5	100.7
2023	4,531	106.1	101.6
2024	4,582	107.3	102.5
2025	4,636	108.6	103.1

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Population of Custer County, Idaho on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	4,269	−8	−5	0	−1
2021	4,445	+176	−16	+3	+202
2022	4,503	+58	−44	0	+96
2023	4,531	+28	−13	+5	+35
2024	4,582	+51	−18	+5	+65
2025	4,636	+54	−18	+2	+72

Age, 2020–2024

The median age is 60.0 ±3.5: for men 61.9 ±3.4 and for women 57.7 ±2.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Custer County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	139 ±67	3.1% ±1.5	5.9% ±<0.1	5.6% ±<0.1
5 to 17	484 ±132	10.8% ±3.0	18.2% ±0.2	16.3% ±<0.1
18 to 24	86 to 252	1.9% to 5.6%	9.8% ±0.1	9.1% ±<0.1
25 to 44	548 ±154	12.3% ±3.5	26.1% ±0.2	26.9% ±<0.1
45 to 64	1,496 ±209	33.5% ±4.7	23.0% ±0.2	24.8% ±<0.1
65 and over	1,634 ±286	36.6% ±6.4	17.0% ±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 $67,574 ±$16,035, and income per person $31,839 ±$3,320, in 2024 dollars. The median is $77,800 ±$743 in Idaho and $80,734 ±$166 in the United States.

Households by income

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Households in Custer County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	448 ±183	23.1% ±9.2	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	355 ±129	18.3% ±6.5	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	304 ±113	15.6% ±5.7	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	439 ±194	22.6% ±9.8	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	271 ±123	13.9% ±6.2	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	28 to 106	1.5% to 5.4%	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	17 to 101	0.9% to 5.2%	9.2% ±0.3	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 Custer County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	696 ±226	15.8% ±5.1	10.6% ±0.3	12.5% ±0.1
Under 18	0 to 106	0.2% to 16.8%	12.4% ±0.5	16.1% ±0.1
18 to 59	97 to 365	6.4% to 22.7%	10.4% ±0.3	11.6% ±0.1
60 and over	412 ±175	18.8% ±7.6	9.1% ±0.4	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 Custer County, ACS 2020–2024
Measure	Custer County	Idaho	United States
Housing units	3,137 ±142	795,014 ±223	143,775,355 ±10,234
Occupied	61.9% ±4.4	89.7% ±0.3	89.9% ±0.1
Vacant	38.1% ±5.7	10.3% ±0.3	10.1% ±0.1
Owner occupied	76.8% ±6.6	72.1% ±0.4	65.2% ±0.3
Renter occupied	23.2% ±7.3	27.9% ±0.4	34.8% ±0.1
Median home value	$381,700 ±$70,646	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$691 ±$138	$1,238 ±$16	$1,413 ±$2
Median year built	1986 ±5	1991 ±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 Custer County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	96 to 306	2.1% to 6.8%	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	3,950 ±115	88.4% ±2.6	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 44	0% to 1.0%	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	47 to 227	1.1% to 5.1%	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 43	0% to 1.0%	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 12	0% to 0.3%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 44	0% to 1.0%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	59 to 213	1.3% to 4.8%	4.2% ±0.1	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 Custer County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	1,769 ±265	39.6% ±5.9	43.9% ±0.3	57.3% ±<0.1
Born in another state	2,402 ±292	53.7% ±6.5	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	0 to 191	0% to 4.3%	1.0% ±0.1	1.7% ±<0.1
Born abroad	75 to 353	1.7% to 7.9%	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	61 to 305	1.4% to 6.8%	2.7% ±0.1	7.4% ±<0.1
Not citizens	0 to 103	0% to 2.3%	3.2% ±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%.

Custer County among the counties of Idaho

40th of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Custer County in population, July 2025
County	July 2025	Change since 2020
Caribou County	7,252	+3.4%
Bear Lake County	6,727	+5.7%
Lincoln County	5,603	+9.1%
Oneida County	5,085	+11.4%
Adams County	5,013	+13.3%
Custer County	4,636	+8.6%
Lewis County	3,704	+4.8%
Butte County	2,783	+7.8%
Camas County	1,316	+21.7%
Clark County	783	−1.0%

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