County · Idaho
Cassia County, Idaho
Cassia County, Idaho. Cassia County had 26,397 residents in 2025 by the Census Bureau's estimate, up 6.9% since 2020, slower than Idaho (+10.4%). It holds 5 places (5 cities, villages and boroughs) and 6 census tracts. GEOID 16031.
Cassia County is one of the 2 counties of the Burley, ID micropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
26,397
Census Bureau estimate (no margin published)
2020 Census count: 24,655 · ACS 2020-2024: 25,483
Median household income
$70,830
±$5,163 (90% margin)
Idaho: $77,800
Median home value
$284,600
±$17,279 (90% margin)
Idaho: $418,600
Median gross rent
$1,000
±$64 (90% margin)
Idaho: $1,238
How many people live in Cassia County, and is it growing?
The 2020 Census counted 24,655 residents in Cassia County. The Census Bureau estimates 26,397 for July 1, 2025, up 6.9% since 2020, slower than Idaho (+10.4%). The 2020-2024 American Community Survey puts the population at 25,483 over 2,566 square miles of land.
| Measure | Cassia County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Total population | 25,483 | 1,934,262 | +1,793 |
| Households | 8,495±184 | 713,005 | +784 |
| Average household size | 2.95±0.06 | 2.64 | no clear change |
| Housing units | 9,096±29 | 795,014 | +349 |
Cassia County's population since 2000
From 21,416 in 2000 to 26,397 in 2025: up 23.3%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Cassia County?
Cassia County holds 5 places: 5 cities, villages and boroughs (incorporated places). The largest is Burley with 12,409 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Cassia County?
The median resident of Cassia County is 33.2 years old; 30.9% are under 18 and 14.5% are 65 or older. The largest group is non-Hispanic white residents at 64.4%, then Hispanic or Latino residents (of any race) at 30.1%. 10.3% of residents were born outside the United States.
| Measure | Cassia County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median age | 33.2±0.4 | 37.3 | no clear change |
| Under 18 years | 30.9%±0.1 pts | 24.1% | – |
| 65 years and over | 14.5%±0.1 pts | 17.0% | – |
| Hispanic or Latino (any race) | 30.1% | 13.6% | +2.9 pts |
| White alone, not Hispanic | 64.4%±1.3 pts | 78.6% | −5.4 pts |
| Black or African American alone, not Hispanic | 0.5%±0.1 pts | 0.7% | – |
| Asian alone, not Hispanic | 0.3%±0.2 pts | 1.3% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.2 pts | 0.7% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.1% | – |
| Two or more races, not Hispanic | 3.3%±1.0 pts | 4.2% | – |
| Some other race alone, not Hispanic | 1.4%±1.1 pts | 0.6% | – |
| Born outside the United States | 10.3%±1.5 pts | 5.9% | no clear change |
| Speak a language other than English at home (age 5+) | 22.3%±2.2 pts | 11.0% | – |
| Civilian veterans (age 18+) | 4.2%±1.0 pts | 8.0% | – |
| With a disability | 14.0%±1.8 pts | 14.1% | – |
| No health insurance coverage | 11.7%±2.0 pts | 9.1% | no clear change |
| High school graduate or higher (age 25+) | 85.4%±2.1 pts | 91.9% | – |
| Bachelor's degree or higher (age 25+) | 21.3%±2.6 pts | 31.8% | no clear change |
| Graduate or professional degree (age 25+) | 6.6%±1.2 pts | 10.5% | – |
| Moved from another state in the past year | 2.0%±0.8 pts | 4.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Cassia County earn?
Half of Cassia County's 8,495 households earn less than $70,830 a year (±$5,163), against $77,800 in Idaho. In 2015-2019 it was $65,147 in 2024 dollars; the margins of error cannot tell the two periods apart. 12.4% of residents live below the poverty line.
| Measure | Cassia County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $70,830±$5,163 | $77,800 | no clear change |
| Mean household income | $92,485±$8,908 | $102,747 | – |
| Per capita income | $32,041±$3,016 | $38,952 | +$5,351 |
| People below the poverty line | 12.4%±3.6 pts | 10.6% | no clear change |
| Children under 18 below the poverty line | 14.7%±5.3 pts | 12.4% | no clear change |
| Households receiving SNAP | 9.2%±2.1 pts | 7.6% | – |
| Households with a broadband subscription | 88.1%±2.1 pts | 91.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Cassia County?
Owners occupy 68.6% of Cassia County's occupied homes and renters 31.4%. The median owner-occupied home is valued at $284,600 by its owner (±$17,279). The median renter pays $1,000 a month including utilities, and 34.8% of renters pay 35% or more of their income on rent.
| Measure | Cassia County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $284,600±$17,279 | $418,600 | +$85,105 |
| Median gross rent | $1,000±$64 | $1,238 | +$204 |
| Renters paying 35% or more of income on rent | 34.8%±6.8 pts | 36.9% | +10.6 pts |
| Median monthly owner costs, with a mortgage | $1,331±$72 | $1,687 | – |
| Owner-occupied homes | 68.6%±3.0 pts | 72.1% | no clear change |
| Housing units | 9,096±29 | 795,014 | +349 |
| Homeowner vacancy rate | 0.0%±0.6 pts | 0.7% | – |
| Rental vacancy rate | 6.4%±4.3 pts | 3.9% | – |
| Single-family detached homes | 79.0%±2.4 pts | 73.8% | – |
| Mobile homes | 7.5%±1.7 pts | 6.9% | – |
| Built 2020 or later | 2.0%±1.1 pts | 3.9% | – |
| Built 1939 or earlier | 15.3%±2.5 pts | 7.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Cassia County building?
Builders took permits for 112 new housing units across Cassia County in 2025 (90 single-family), 4.2 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Cassia County get to work?
78.4% of Cassia County's workers drive alone and 8.9% work from home. The average trip to work takes 17.9 minutes. The unemployment rate in 2020-2024 averaged 2.4%.
| Measure | Cassia County | Idaho | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 63.7%±2.5 pts | 63.0% | – |
| Unemployment rate | 2.4%±1.1 pts | 3.7% | no clear change |
| Drove alone to work | 78.4%±3.3 pts | 72.7% | – |
| Carpooled | 9.3%±2.0 pts | 8.9% | – |
| Public transportation | 0.2%±0.2 pts | 0.5% | – |
| Walked | 1.4%±0.7 pts | 2.6% | – |
| Worked from home | 8.9%±2.1 pts | 13.3% | +4.6 pts |
| Mean travel time to work | 17.9 min±1.2 | 21.6 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Cassia County's census tracts?
Cassia County is divided into 6 census tracts. Among those with a reliable estimate, median household income runs from $37,708 (Tract 9504) to $92,667 (Tract 9506).
| Tract 950116031950100 | 3,553±656 | $67,589 |
|---|---|---|
| Tract 950216031950200 | 3,401±470 | $61,848 |
| Tract 950316031950300 | 5,754±454 | $80,489 |
| Tract 950416031950400 | 3,916±479 | $37,708 |
| Tract 950516031950500 | 6,314±605 | $84,292 |
| Tract 950616031950600 | 2,545±395 | $92,667 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Cassia County compare with Idaho's other counties?
| Measure | Rank |
|---|---|
| Population | 15th of 44 |
| Growth 2020-2025 | 26th of 44 |
| Residents per square mile | 21st of 44 |
| Median household income | 18th of 44 |
| Median home value | 30th of 44 |
| Median gross rent | 16th of 44 |
| Poverty rate | 16th of 43 |
| Bachelor's degree or higher | 28th of 44 |
| Median age | 39th of 44 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Cassia County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.