Trinity County, California Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Trinity County, CA 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 averageLess healthy than 86% of counties in California
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D
Income Well below averageLess wealthy than 86% of counties in California
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D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| Population | 15,860 | 39,245,658 | 337,468,954 |
| Population density (per sq mi) | 4.9 | 239.4 | 86.4 |
| Population growth (%/yr) | 2.68% | 0.19% | 0.59% |
| Median age | 53.8 | 35.5 | 37.3 |
| Households | 5,585 | 13,531,619 | 130,235,071 |
Population in Trinity County grew by 13.9% from 2009 to 2024, reaching 15,860 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Trinity County is Boomers, aged 61–79, at 28.4% of residents. That is 13.1 points above California as a whole.
- Gen Z 13–28 2,274 14.3% -7.4 pts
- Millennials 29–44 2,537 16.0% -7.7 pts
- Gen X 45–60 3,714 23.4% +3.6 pts
- Boomers 61–79 4,497 28.4% +13.1 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 California, 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 49.2% of the people living in Trinity County and men 50.8%.
- Women 49.2% California 49.9%
- Men 50.8% California 50.1%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in Trinity County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
Trinity County has a the economy index of D, which means it is barely prosperous.
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| Median household income | $51,690 | $99,161 | $80,455 |
| Income growth (%/yr) | 4.99% | 5.57% | 4.80% |
| Unemployment rate | 8.3% | 6.6% | 5.2% |
The median household income in Trinity County is about 48% lower than in California.
Housing
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| Median home price | $329,687 | $650,794 | $248,835 |
| Median rent | $1,073 | $2,036 | $1,407 |
| Homeownership rate | 71.7% | 55.9% | 65.2% |
The median home price in Trinity County is about 25.6 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $1,073 per month for that long.
Commute Time & Mobility
Commuters in Trinity County spend about 35 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 148 hours, about 6.2 full days, spent commuting.
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 17.7 | 23.5 | 22.4 |
| Round-trip commute (min) | 35.5 | 47.0 | 44.8 |
| Yearly time spent (hours) | 148 | 196 | 187 |
| Estimated yearly cost | $4,582 | $6,065 | $5,790 |
| Work from home | 21.3% | 17.2% | 15.0% |
| Highway traffic (vehicles/day) | 4,075 | 16,509 | 8,813 |
| Local road traffic (vehicles/day) | 65 | 2,449 | 1,355 |
Fastest commutes among counties in
California:
Inyo County (11.1 min), Mono County (12.0 min), Del Norte County (12.1 min).
Slowest:
Alpine County (31.3 min), San Benito County (31.2 min), Contra Costa County (31.0 min).
The average commute time in Trinity County is 18 minutes, shorter than the 23 minutes in California.
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
Trinity County has a education index of D, which means it is barely educated.
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 18.4% | 33.0% | 31.6% |
| Average household size | 2.79 | 2.84 | 2.53 |
Highest education index among counties in
California:
Marin County (0.5), San Francisco County (0.4), Santa Clara County (0.4).
Lowest:
Colusa County (0.2), Merced County (0.2), Glenn County (0.2).
Health
Trinity County has a health index of B, which means it is quite healthy.
| Metric | Trinity County | California Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 80.9 | 79.6 | 78.3 |
| Self-rated poor health | 19.6% | 16.4% | 16.3% |
| Smokers | 17.6% | 13.9% | 19.0% |
Highest health index among counties in
California:
San Francisco County (0.8), San Mateo County (0.8), Santa Clara County (0.8).
Lowest:
Lake County (0.8), Imperial County (0.8), Tulare County (0.8).
Trinity County, CA Compared With Nearby Counties
Trinity County, CA is the smallest of the 6 counties compared here, 15,860 residents against a local median of 90,240. Trinity County, CA's median household income, at $51,690, runs 20% below the $64,453 typical of the counties around it. That is the weaker end of the local range on this measure.
The counties themselves spread $13,561 on median household income, so Trinity County, CA sits at one end of an already wide local range rather than apart from it. Trinity County, CA has the 6th highest median household income of the 6 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| Trinity County, CA | 15,860 | $51,690 #6/6 | $329,687 #3/6 | 17.7 min #5/6 |
| Humboldt County, CA | 134,541 | $61,643 | $397,296 | 15.9 min |
| Tehama County, CA | 65,167 | $64,453 | $233,391 | 18.4 min |
| Shasta County, CA | 181,436 | $72,982 | $299,218 | 16.4 min |
| Siskiyou County, CA | 43,469 | $59,421 | $196,249 | 16.2 min |
| Mendocino County, CA | 90,240 | $68,620 | $513,099 | 15.1 min |
Frequently Asked Questions
Common questions about Trinity County, California.
How big is Trinity County, California by population?
About 15,860 people live in Trinity County, California, in 5,585 households of 2.8 people on average. The median age is 53.8, so residents are older than the U.S. median of 37.3 by about 17 years.
How densely populated is Trinity County, California?
Averaged over its land area, Trinity County, California has 5 people per square mile, a density typical of rural areas. That is about 6% of the U.S. average of 86.
Can a typical household afford a home in Trinity County, California?
The median home costs 6.4 times the median household income ($329,687 against $51,690), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $1,073 a month takes about 25% 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 Trinity County, California?
Unemployment in Trinity County, California is 8.3%, well above the U.S. rate of 5.2%, so job seekers may face more competition than elsewhere.
What share of adults in Trinity County, California have a college degree?
18.4% of adults in Trinity County, California hold a bachelor's degree or higher (about 1 in 5), well below the U.S. share of 31.6%.
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