Trinity County, California

Trinity County population, land area and income

Trinity County had 15,642 residents in the Census Vintage 2024 estimate, on 3,179.3 square miles of land. It ranks 54th of 58 in California by population and 18th by land area. That works out to 4.9 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in California has 187,274 residents, so Trinity County has 8% of the typical county's population.

Its SAIPE 2023 median household income of $52,079 is in the bottom quarter among 3,143 counties with an estimate.

How Trinity County's population changed since 2020

Trinity County lost 453 residents between the July 2020 and July 2024 estimates, a drop of 2.8%. That ranks 49th of 58 in California for growth. The median California county changed by -0.6%, and the state as a whole by -0.2%.

Since the April 2020 estimates base, Trinity County recorded 432 births and 786 deaths, a natural change of -354. Net international migration added -3 and net domestic migration, people moving to or from other US counties, came to -100. The largest single component was natural change, which removed 354 people.

Where Trinity County is

The Census internal point of Trinity County is at 40.647900, -123.114700. It sits in UTM zone 10N. The map shades California's 58 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Trinity County outlined. Dots are towns of 1,000+ people with residents in it.

Towns in Trinity County

No incorporated place of 1,000 or more people has residents in Trinity County. Its 15,642 residents live in smaller towns, census-designated places, or unincorporated land, which the subcounty estimates do not list at this size.

Counties bordering Trinity County

The Census 2024 county adjacency file lists 5 neighbors for Trinity County. The most populous is Shasta County, CA, with 181,121 residents. Distances run between Census internal points in a straight line.

• Shasta County

  181,121 people

  57 mi E

• Humboldt County

  132,380 people

  43 mi W

• Mendocino County

  89,175 people

  86 mi SSW

• Tehama County

  64,451 people

  59 mi SE

• Siskiyou County

  42,498 people

  72 mi NNE

Distance to Sacramento and the nearest big city

Sacramento is 167.1 miles SSE of Trinity County's internal point in a straight line. The nearest place of 100,000 or more is Chico, CA (population 102,911), 92.0 miles away. The nearest place of 10,000 or more is Shasta Lake, CA (population 10,244), 38.5 miles away.

Trinity County FIPS code

The FIPS code of Trinity County is 06105: state code 06 for California plus county code 105. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $52,079.