Cassia County, Idaho Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Cassia County, ID Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
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B
Health Around average
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C
Income Below average
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D
Education Well below averageLess educated than 74% of counties in Idaho
Source: Map AI Methodology
Population: density and quick facts
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Population | 25,479 | 1,929,983 | 337,468,954 |
| Population density (per sq mi) | 9.9 | 23.1 | 86.4 |
| Population growth (%/yr) | 1.05% | 2.12% | 0.59% |
| Median age | 31.0 | 38.7 | 37.3 |
| Households | 8,494 | 712,816 | 130,235,071 |
Population in Cassia County grew by 20.4% from 2009 to 2024, reaching 25,479 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Cassia County is Gen Z, aged 13–28, at 23.4% of residents. That is 0.5 points above Idaho as a whole.
- Gen Z 13–28 5,953 23.4% +0.5 pts
- Millennials 29–44 5,039 19.8% -1.0 pts
- Gen X 45–60 4,270 16.8% -2.5 pts
- Boomers 61–79 3,780 14.8% -1.2 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Idaho, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 48.8% of the people living in Cassia County and men 51.2%.
- Women 48.8% Idaho 49.6%
- Men 51.2% Idaho 50.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Cassia County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Cassia County has a the economy index of C, which means it is somewhat prosperous.
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median household income | $71,744 | $78,141 | $80,455 |
| Income growth (%/yr) | 5.67% | 5.97% | 4.80% |
| Unemployment rate | 2.4% | 3.7% | 5.2% |
The median household income in Cassia County is about 8% lower than in Idaho.
Housing
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median home price | $179,861 | $394,140 | $248,835 |
| Median rent | $1,000 | $1,236 | $1,407 |
| Homeownership rate | 68.6% | 72.3% | 65.2% |
The median home price in Cassia County is about 15.0 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,000 per month for that long.
Commute Time & Mobility
Commuters in Cassia County spend about 28 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 116 hours, about 4.8 full days, spent commuting.
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 13.9 | 18.0 | 22.4 |
| Round-trip commute (min) | 27.8 | 35.9 | 44.8 |
| Yearly time spent (hours) | 116 | 150 | 187 |
| Estimated yearly cost | $3,586 | $4,641 | $5,790 |
| Work from home | 8.9% | 13.3% | 15.0% |
| Highway traffic (vehicles/day) | 3,629 | 4,714 | 8,813 |
| Local road traffic (vehicles/day) | 543 | 865 | 1,355 |
Fastest commutes among counties in
Idaho:
Custer County (8.9 min), Lemhi County (11.6 min), Madison County (12.0 min).
Slowest:
Camas County (49.5 min), Boise County (38.0 min), Lincoln County (32.0 min).
The average commute time in Cassia County is 14 minutes, shorter than the 18 minutes in Idaho.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
Cassia County has a education index of D, which means it is barely educated.
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 18.2% | 27.1% | 31.6% |
| Average household size | 2.95 | 2.64 | 2.53 |
Highest education index among counties in
Idaho:
Latah County (0.4), Teton County (0.3), Ada County (0.3).
Lowest:
Clark County (0.1), Owyhee County (0.2), Lincoln County (0.2).
Health
Cassia County has a health index of B, which means it is quite healthy.
| Metric | Cassia County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 78.7 | 79.5 | 78.3 |
| Self-rated poor health | 16.5% | 15.6% | 16.3% |
| Smokers | 16.9% | 17.6% | 19.0% |
Highest health index among counties in
Idaho:
Madison County (0.8), Latah County (0.8), Ada County (0.8).
Lowest:
Shoshone County (0.8), Washington County (0.8), Lincoln County (0.8).
Cassia County, ID Compared With Nearby Counties
Cassia County, ID is typical in size for this group, 25,479 residents against a local median of 25,173, so the measures below are close to a like for like comparison. Cassia County, ID's median home price, at $179,861, runs 200% above the $59,999 typical of the counties around it.
Commute tells the same story from another angle: 13.9 min against a local median of 18.1 min, 23% below it. The one measure here that carries a verdict is commute, and at 23% below the local median it puts Cassia County, ID at the better end of the local range. The counties themselves spread $226,253 on median home price, so Cassia County, ID sits at one end of an already wide local range rather than apart from it. Cassia County, ID has the 2nd highest median home price of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Cassia County, ID | 25,479 | $71,744 #2/4 | $179,861 #2/4 | 13.9 min #1/4 |
| Minidoka County, ID | 22,208 | $69,748 | $48,747 | 16.4 min |
| Jerome County, ID | 25,173 | $71,652 | $275,000 | 18.1 min |
| Box Elder County, UT | 61,231 | $84,650 | $59,999 | 18.5 min |
Frequently Asked Questions
Common questions about Cassia County, Idaho.
What is the population of Cassia County, Idaho?
About 25,479 people live in Cassia County, Idaho, in 8,494 households of 2.9 people on average. The median age is 31.0, so residents are younger than the U.S. median of 37.3 by about 6 years.
Is Cassia County, Idaho mostly urban or rural?
Averaged over its land area, Cassia County, Idaho has 10 people per square mile, a density typical of rural areas. That is about 11% of the U.S. average of 86.
Is Cassia County, Idaho an affordable place to live?
The median home costs 2.5 times the median household income ($179,861 against $71,744), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $1,000 a month takes about 17% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
Is it hard to find a job in Cassia County, Idaho?
Unemployment in Cassia County, Idaho is only 2.4%, well below the U.S. rate of 5.2%, a sign of a tight labor market where employers compete for workers.
How educated are people in Cassia County, Idaho?
18.2% of adults in Cassia County, Idaho hold a bachelor's degree or higher (about 1 in 5), well below the U.S. share of 31.6%.
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