Demographics of Cassia County, Idaho

Cassia County, Idaho had 26,397 people on July 1, 2025, by the Census Bureau’s estimate: +1,644 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.

Cassia County, in four figures

26,397
Population: July 1, 2025, Vintage 2025 estimate.; +6.6%
Change since July 2020: +1,644 people.; 33.2 ±0.4
Median age: ACS 2020–⁠2024.; $70,830 ±$5,163
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.

Cassia County, Idaho's population grew 6.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Cassia 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

Cassia County, Idaho's population grew 6.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Cassia 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	24,753	100.0	100.0
2021	25,235	101.9	100.2
2022	25,657	103.7	100.7
2023	25,948	104.8	101.6
2024	26,210	105.9	102.5
2025	26,397	106.6	103.1

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Population of Cassia 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	24,753	+65	+49	+1	+6
2021	25,235	+482	+137	+41	+295
2022	25,657	+422	+134	+132	+174
2023	25,948	+291	+111	+332	−151
2024	26,210	+262	+167	+322	−225
2025	26,397	+187	+182	+93	−89

Age, 2020–2024

The median age is 33.2 ±0.4: for men 33.0 ±0.5 and for women 33.4 ±0.6. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Cassia County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	1,987 ±24	7.8% ±0.1	5.9% ±<0.1	5.6% ±<0.1
5 to 17	5,892 ±361	23.1% ±1.4	18.2% ±0.2	16.3% ±<0.1
18 to 24	2,550 ±305	10.0% ±1.2	9.8% ±0.1	9.1% ±<0.1
25 to 44	6,167 ±349	24.2% ±1.4	26.1% ±0.2	26.9% ±<0.1
45 to 64	5,194 ±289	20.4% ±1.1	23.0% ±0.2	24.8% ±<0.1
65 and over	3,693 ±304	14.5% ±1.2	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $70,830 ±$5,163, and income per person $32,041 ±$3,016, 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 Cassia County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	1,197 ±254	14.1% ±3.0	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	1,704 ±278	20.1% ±3.2	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	1,566 ±230	18.4% ±2.7	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	1,331 ±218	15.7% ±2.5	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	1,618 ±240	19.0% ±2.8	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	594 ±142	7.0% ±1.7	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	485 ±146	5.7% ±1.7	9.2% ±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 Cassia County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	3,119 ±895	12.4% ±3.6	10.6% ±0.3	12.5% ±0.1
Under 18	1,152 ±327	14.7% ±4.0	12.4% ±0.5	16.1% ±0.1
18 to 59	1,431 ±505	11.5% ±4.0	10.4% ±0.3	11.6% ±0.1
60 and over	536 ±164	11.0% ±3.3	9.1% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Cassia County, ACS 2020–2024
Measure	Cassia County	Idaho	United States
Housing units	9,096 ±29	795,014 ±223	143,775,355 ±10,234
Occupied	93.4% ±2.0	89.7% ±0.3	89.9% ±0.1
Vacant	6.6% ±2.0	10.3% ±0.3	10.1% ±0.1
Owner occupied	68.6% ±2.8	72.1% ±0.4	65.2% ±0.3
Renter occupied	31.4% ±3.1	27.9% ±0.4	34.8% ±0.1
Median home value	$284,600 ±$17,279	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$1,000 ±$64	$1,238 ±$16	$1,413 ±$2
Median year built	1975 ±2	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 Cassia County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	7,664 ±0	30.1% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	16,401 ±341	64.4% ±1.3	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	118 ±23	0.5% ±0.1	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	28 to 106	0.1% to 0.4%	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 91	0% to 0.4%	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 12	0% to < 0.1%	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	64 to 630	0.3% to 2.5%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	838 ±250	3.3% ±1.0	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 Cassia County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	14,746 ±610	57.9% ±2.4	43.9% ±0.3	57.3% ±<0.1
Born in another state	7,951 ±526	31.2% ±2.1	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	65 to 269	0.3% to 1.1%	1.0% ±0.1	1.7% ±<0.1
Born abroad	2,619 ±389	10.3% ±1.5	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	861 ±270	3.4% ±1.1	2.7% ±0.1	7.4% ±<0.1
Not citizens	1,758 ±316	6.9% ±1.2	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%.

Cassia County among the counties of Idaho

15th of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Cassia County in population, July 2025
County	July 2025	Change since 2020
Nez Perce County	42,905	+1.8%
Latah County	41,842	+5.6%
Jefferson County	35,297	+13.6%
Elmore County	29,465	+2.8%
Payette County	27,824	+8.8%
Cassia County	26,397	+6.6%
Jerome County	26,362	+8.6%
Blaine County	25,517	+4.8%
Minidoka County	22,911	+5.7%
Gem County	21,773	+13.0%
Idaho County	17,874	+7.7%

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