Demographics of Trinity County, California

Trinity County, California had 15,720 people on July 1, 2025, by the Census Bureau’s estimate: −379 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.

Trinity County, in four figures

15,720
Population: July 1, 2025, Vintage 2025 estimate.; −2.4%
Change since July 2020: −379 people.; 54.9 ±1.2
Median age: ACS 2020–⁠2024.; $53,002 ±$8,924
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.

Trinity County, California's population shrank 2.4% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Trinity County, California'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).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Trinity County, California's population shrank 2.4% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Trinity County, California'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	16,099	100.0	100.0
2021	16,110	100.1	100.2
2022	15,813	98.2	100.7
2023	15,690	97.5	101.6
2024	15,697	97.5	102.5
2025	15,720	97.6	103.1

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Population of Trinity County, California on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	16,099	−17	−16	0	−3
2021	16,110	+11	−54	−2	+75
2022	15,813	−297	−97	−5	−192
2023	15,690	−123	−86	−3	−33
2024	15,697	+7	−68	0	+79
2025	15,720	+23	−71	−1	+97

Age, 2020–2024

The median age is 54.9 ±1.2: for men 55.0 ±0.5 and for women 54.1 ±3.0. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Trinity County by age, ACS 2020–2024
Age	People	Share	California	United States
Under 5	608 ±117	3.8% ±0.7	5.5% ±<0.1	5.6% ±<0.1
5 to 17	2,119 ±328	13.4% ±2.1	16.5% ±<0.1	16.3% ±<0.1
18 to 24	672 ±245	4.2% ±1.5	9.1% ±<0.1	9.1% ±<0.1
25 to 44	3,198 ±517	20.2% ±3.3	28.7% ±<0.1	26.9% ±<0.1
45 to 64	4,468 ±656	28.2% ±4.1	24.6% ±<0.1	24.8% ±<0.1
65 and over	4,795 ±569	30.2% ±3.6	15.7% ±<0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $53,002 ±$8,924, and income per person $31,301 ±$3,345, in 2024 dollars. The median is $99,122 ±$310 in California and $80,734 ±$166 in the United States.

Households by income

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Households in Trinity County by income, ACS 2020–2024
Household income	Households	Share	California	United States
Under $25,000	1,421 ±361	25.4% ±6.3	12.5% ±0.1	14.6% ±<0.1
$25,000 to $49,999	1,323 ±294	23.7% ±5.2	13.3% ±0.1	16.7% ±<0.1
$50,000 to $74,999	751 ±250	13.4% ±4.4	13.0% ±0.1	15.5% ±<0.1
$75,000 to $99,999	864 ±273	15.5% ±4.8	11.6% ±0.1	12.6% ±<0.1
$100,000 to $149,999	568 ±221	10.2% ±3.9	17.8% ±0.1	17.5% ±<0.1
$150,000 to $199,999	234 ±90	4.2% ±1.6	11.3% ±0.1	9.6% ±<0.1
$200,000 or more	424 ±199	7.6% ±3.5	20.5% ±0.1	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 Trinity County by age, ACS 2020–2024
Age	Below poverty	Rate	California	United States
All ages	3,257 ±758	20.7% ±4.8	12.0% ±0.1	12.5% ±0.1
Under 18	593 ±203	21.8% ±6.7	15.0% ±0.1	16.1% ±0.1
18 to 59	1,377 ±373	20.9% ±5.2	11.0% ±0.1	11.6% ±0.1
60 and over	1,287 ±513	20.1% ±7.6	11.5% ±0.1	11.0% ±<0.1

Housing, 2020–2024

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Housing in Trinity County, ACS 2020–2024
Measure	Trinity County	California	United States
Housing units	8,112 ±20	14,644,735 ±1,665	143,775,355 ±10,234
Occupied	68.8% ±3.3	92.5% ±0.1	89.9% ±0.1
Vacant	31.2% ±3.3	7.5% ±0.1	10.1% ±0.1
Owner occupied	71.7% ±6.3	55.9% ±0.3	65.2% ±0.3
Renter occupied	28.3% ±6.0	44.1% ±0.2	34.8% ±0.1
Median home value	$325,800 ±$23,401	$734,700 ±$1,307	$332,700 ±$236
Median gross rent	$1,073 ±$210	$2,036 ±$5	$1,413 ±$2
Median year built	1977 ±2	1976 ±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 Trinity County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	California	United States
Hispanic or Latino	973 ±0	6.1% ±<0.1	40.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	12,274 ±406	77.4% ±2.6	33.8% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	52 to 294	0.3% to 1.9%	5.2% ±<0.1	11.9% ±<0.1
Asian alone, not Hispanic	13 to 181	0.1% to 1.1%	15.3% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	253 to 925	1.6% to 5.8%	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 198	0% to 1.2%	0.3% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	137 to 991	0.9% to 6.2%	0.6% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,095 ±394	6.9% ±2.5	4.4% ±<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 Trinity County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	California	United States
Born in the state	12,277 ±617	77.4% ±3.9	56.5% ±0.1	57.3% ±<0.1
Born in another state	2,808 ±493	17.7% ±3.1	15.0% ±0.1	26.9% ±<0.1
Born a citizen outside the states	0 to 25	0% to 0.2%	1.5% ±<0.1	1.7% ±<0.1
Born abroad	379 to 1,147	2.4% to 7.2%	27.0% ±0.1	14.1% ±<0.1
Naturalized citizens	185 to 907	1.2% to 5.7%	14.7% ±0.1	7.4% ±<0.1
Not citizens	68 to 366	0.4% to 2.3%	12.3% ±0.1	6.8% ±<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%.

Trinity County among the counties of California

54th of 58 by population, July 2025. Every one is listed on the California page.

Counties of California near Trinity County in population, July 2025
County	July 2025	Change since 2020
Del Norte County	26,410	−4.4%
Colusa County	21,836	−0.1%
Plumas County	18,583	−5.9%
Inyo County	18,158	−4.4%
Mariposa County	16,918	−1.2%
Trinity County	15,720	−2.4%
Mono County	12,505	−5.4%
Modoc County	8,426	−2.9%
Sierra County	3,098	−4.0%
Alpine County	1,043	−11.6%

Elsewhere on the site

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

Data retrieved September 25, 2026