Demographics of Twin Falls County, Idaho

Twin Falls County, Idaho had 97,539 people on July 1, 2025, by the Census Bureau’s estimate: +7,174 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.

Twin Falls County, in four figures

97,539
Population: July 1, 2025, Vintage 2025 estimate.; +7.9%
Change since July 2020: +7,174 people.; 36.1 ±0.3
Median age: ACS 2020–⁠2024.; $67,409 ±$3,701
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.

Twin Falls County, Idaho's population grew 7.9% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Twin Falls 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).

Source: The Census Bureau

About this chart

The figures

Twin Falls County, Idaho's population grew 7.9% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Twin Falls 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	90,365	100.0	100.0
2021	92,382	102.2	100.2
2022	93,890	103.9	100.7
2023	95,392	105.6	101.6
2024	96,467	106.8	102.5
2025	97,539	107.9	103.1

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Population of Twin Falls 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	90,365	+315	+49	+3	+265
2021	92,382	+2,017	+119	+37	+1,923
2022	93,890	+1,508	+21	+255	+1,214
2023	95,392	+1,502	+213	+388	+895
2024	96,467	+1,075	+221	+457	+397
2025	97,539	+1,072	+252	+127	+689

Age, 2020–2024

The median age is 36.1 ±0.3: for men 35.6 ±0.3 and for women 36.6 ±0.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Twin Falls County by age, ACS 2020–2024
Age	People	Share	Idaho	United States
Under 5	5,903 ±109	6.3% ±0.1	5.9% ±<0.1	5.6% ±<0.1
5 to 17	18,769 ±772	20.0% ±0.8	18.2% ±0.2	16.3% ±<0.1
18 to 24	8,170 ±590	8.7% ±0.6	9.8% ±0.1	9.1% ±<0.1
25 to 44	24,831 ±664	26.5% ±0.7	26.1% ±0.2	26.9% ±<0.1
45 to 64	20,513 ±723	21.9% ±0.8	23.0% ±0.2	24.8% ±<0.1
65 and over	15,548 ±796	16.6% ±0.8	17.0% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $67,409 ±$3,701, and income per person $35,344 ±$1,840, 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 Twin Falls County by income, ACS 2020–2024
Household income	Households	Share	Idaho	United States
Under $25,000	4,982 ±615	14.3% ±1.8	12.5% ±0.3	14.6% ±<0.1
$25,000 to $49,999	7,750 ±785	22.3% ±2.2	17.6% ±0.4	16.7% ±<0.1
$50,000 to $74,999	6,372 ±673	18.3% ±1.9	18.1% ±0.4	15.5% ±<0.1
$75,000 to $99,999	4,328 ±510	12.5% ±1.5	14.7% ±0.4	12.6% ±<0.1
$100,000 to $149,999	6,729 ±650	19.4% ±1.9	19.3% ±0.4	17.5% ±<0.1
$150,000 to $199,999	2,222 ±359	6.4% ±1.0	8.7% ±0.3	9.6% ±<0.1
$200,000 or more	2,371 ±347	6.8% ±1.0	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 Twin Falls County by age, ACS 2020–2024
Age	Below poverty	Rate	Idaho	United States
All ages	10,603 ±1,393	11.5% ±1.5	10.6% ±0.3	12.5% ±0.1
Under 18	4,060 ±607	16.5% ±2.4	12.4% ±0.5	16.1% ±0.1
18 to 59	4,679 ±700	9.9% ±1.5	10.4% ±0.3	11.6% ±0.1
60 and over	1,864 ±362	9.1% ±1.7	9.1% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Twin Falls County, ACS 2020–2024
Measure	Twin Falls County	Idaho	United States
Housing units	36,429 ±72	795,014 ±223	143,775,355 ±10,234
Occupied	95.4% ±1.0	89.7% ±0.3	89.9% ±0.1
Vacant	4.6% ±0.9	10.3% ±0.3	10.1% ±0.1
Owner occupied	70.5% ±2.0	72.1% ±0.4	65.2% ±0.3
Renter occupied	29.5% ±1.9	27.9% ±0.4	34.8% ±0.1
Median home value	$337,900 ±$8,873	$418,600 ±$2,550	$332,700 ±$236
Median gross rent	$1,089 ±$35	$1,238 ±$16	$1,413 ±$2
Median year built	1982 ±3	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 Twin Falls County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Idaho	United States
Hispanic or Latino	16,912 ±0	18.0% ±<0.1	13.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	70,557 ±667	75.3% ±0.7	78.6% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	766 ±228	0.8% ±0.2	0.7% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	1,060 ±217	1.1% ±0.2	1.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	254 ±106	0.3% ±0.1	0.7% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	293 ±38	0.3% ±<0.1	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	102 to 744	0.1% to 0.8%	0.6% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	3,469 ±616	3.7% ±0.7	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 Twin Falls County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Idaho	United States
Born in the state	49,415 ±1,763	52.7% ±1.9	43.9% ±0.3	57.3% ±<0.1
Born in another state	35,664 ±1,676	38.0% ±1.8	49.1% ±0.3	26.9% ±<0.1
Born a citizen outside the states	682 ±213	0.7% ±0.2	1.0% ±0.1	1.7% ±<0.1
Born abroad	7,973 ±870	8.5% ±0.9	5.9% ±0.2	14.1% ±<0.1
Naturalized citizens	3,821 ±764	4.1% ±0.8	2.7% ±0.1	7.4% ±<0.1
Not citizens	4,152 ±630	4.4% ±0.7	3.2% ±0.2	6.8% ±<0.1

Twin Falls County among the counties of Idaho

5th of 44 by population, July 2025. Every one is listed on the Idaho page.

Counties of Idaho near Twin Falls County in population, July 2025
County	July 2025	Change since 2020
Ada County	546,141	+9.6%
Canyon County	275,123	+18.1%
Kootenai County	191,864	+11.0%
Bonneville County	135,771	+8.9%
Twin Falls County	97,539	+7.9%
Bannock County	91,591	+4.9%
Madison County	55,172	+4.2%
Bonner County	54,420	+14.8%
Bingham County	51,153	+6.4%
Nez Perce County	42,905	+1.8%

Elsewhere on the site

Rankings this appears in

No. 5 Counties by population in Idaho
No. 22 Counties by population growth in Idaho

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

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026