Washington County, Idaho Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Washington 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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C
Health Below averageAmong the 3 least healthy counties in Idaho
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D
Income Well below averageLess wealthy than 81% of counties in Idaho
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D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Population | 11,141 | 1,929,983 | 337,468,954 |
| Population density (per sq mi) | 7.6 | 23.1 | 86.4 |
| Population growth (%/yr) | 1.32% | 2.12% | 0.59% |
| Median age | 45.1 | 38.7 | 37.3 |
| Households | 4,202 | 712,816 | 130,235,071 |
Population in Washington County grew by 11.3% from 2009 to 2024, reaching 11,141 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Washington County is Boomers, aged 61–79, at 24.9% of residents. That is 8.9 points above Idaho as a whole.
- Gen Z 13–28 1,890 17.0% -5.9 pts
- Millennials 29–44 1,927 17.3% -3.4 pts
- Gen X 45–60 2,078 18.7% -0.6 pts
- Boomers 61–79 2,776 24.9% +8.9 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 50.5% of the people living in Washington County and men 49.5%.
- Women 50.5% Idaho 49.6%
- Men 49.5% Idaho 50.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Washington County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Washington County has a the economy index of D, which means it is barely prosperous.
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median household income | $53,270 | $78,141 | $80,455 |
| Income growth (%/yr) | 4.58% | 5.97% | 4.80% |
| Unemployment rate | 5.2% | 3.7% | 5.2% |
The median household income in Washington County is about 32% lower than in Idaho.
Housing
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Median home price | $237,870 | $394,140 | $248,835 |
| Median rent | $937 | $1,236 | $1,407 |
| Homeownership rate | 74.6% | 72.3% | 65.2% |
The median home price in Washington County is about 21.1 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $937 per month for that long.
Commute Time & Mobility
Commuters in Washington County spend about 26 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 107 hours, about 4.5 full days, spent commuting.
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 12.8 | 18.0 | 22.4 |
| Round-trip commute (min) | 25.6 | 35.9 | 44.8 |
| Yearly time spent (hours) | 107 | 150 | 187 |
| Estimated yearly cost | $3,311 | $4,641 | $5,790 |
| Work from home | 8.3% | 13.3% | 15.0% |
| Highway traffic (vehicles/day) | 3,348 | 4,714 | 8,813 |
| Local road traffic (vehicles/day) | 425 | 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 Washington County is 13 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
Washington County has a education index of D, which means it is barely educated.
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 16.2% | 27.1% | 31.6% |
| Average household size | 2.61 | 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
Washington County has a health index of C, which means it is somewhat healthy.
| Metric | Washington County | Idaho Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 78.5 | 79.5 | 78.3 |
| Self-rated poor health | 18.8% | 15.6% | 16.3% |
| Smokers | 18.3% | 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).
Washington County, ID Compared With Nearby Counties
Washington County, ID is the smallest of the 4 counties compared here, 11,141 residents against a local median of 26,771. Washington County, ID's commute, at 12.8 min, runs 45% below the 23.2 min typical of the counties around it. That is the better end of the local range on this measure.
Median home price tells the same story from another angle: $237,870 against a local median of $354,910, 33% below it. The picture is mixed rather than uniform: commute runs ahead of the neighbourhood while median household income runs behind it, so Washington County, ID is trading one against the other rather than simply out-performing what surrounds it. The counties themselves spread 12.5 min on commute, so Washington County, ID sits at one end of an already wide local range rather than apart from it. Washington County, ID has the lowest commute of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Washington County, ID | 11,141 | $53,270 #4/4 | $237,870 #3/4 | 12.8 min #1/4 |
| Payette County, ID | 26,771 | $67,405 | $354,910 | 17.7 min |
| Gem County, ID | 20,614 | $65,574 | $112,500 | 30.3 min |
| Canyon County, ID | 250,790 | $76,988 | $362,701 | 23.2 min |
Frequently Asked Questions
Common questions about Washington County, Idaho.
What is the population of Washington County, Idaho?
About 11,141 people live in Washington County, Idaho, in 4,202 households of 2.6 people on average. The median age is 45.1, so residents are older than the U.S. median of 37.3 by about 8 years.
How densely populated is Washington County, Idaho?
Averaged over its land area, Washington County, Idaho has 8 people per square mile, a density typical of rural areas. That is about 9% of the U.S. average of 86.
Is Washington County, Idaho an affordable place to live?
The median home costs 4.5 times the median household income ($237,870 against $53,270), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $937 a month takes about 21% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
How common is a college degree in Washington County, Idaho?
16.2% of adults in Washington County, Idaho hold a bachelor's degree or higher (about 1 in 6), well below the U.S. share of 31.6%.
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