Trinity County, California

Trinity County: County in northwestern California, United States


Trinity County is a county located in the U.S. state of California. As of the 2010 census, the population was 13,786 and a population density of 2 people per km². After 10 years in 2020 county had an estimated population of 12,216 inhabitants. Its county seat is Weaverville. The county was created 173 years ago in 1849.

Trinity County locator map
Location of Trinity County on California map.

Quick Facts about Trinity County

Population : 12,216 (2020)
Country : United States of America
State : California (United States)
Different from : Trinity County
Area : 8307 km2
Water as percent of area : 0.9%
Land as percent of area : 99.1%
Named for : Trinity River
Altitude : 2,799 feet / 853 meters
Capital : Weaverville
Establishment : January 01, 1850
Time Zone : America/Los_Angeles
Local time : 21:29:00 (9th December 2023)
Density : 1 Pop. per km² as of 2020
Population growth : -12.85% (2010-2020)
Weather : 28℉ Mostly Clear 7-days weather
Trinity dam us bor image
Trinity dam us bor
Trinity dam us bor image


Trinity County is located at 40°39'2"N 123°6'45"W (40.6506900, -123.1126300). It has 5 neighbors: Mendocino County, Humboldt County, Shasta County, Siskiyou County and Tehama County.

Trinity County map

Trinity County Populated Places

Cities, towns, neighborhoods & other populated places in Trinity County.

City Name Population Title
Weaverville 3,600 California
Hayfork 2,368 Census-designated place in Trinity County, California


Trinity County forecast: Mostly clear, with a low around 28. Northeast wind 1 to 7 mph. more

Trinity County has 5 neighbours.

  • Weaverville


According to census records, the population of Trinity County decreased by 12.85% in 10 years.

Year Population % Change Method
2010 13,786 - census
2011 13,685 -0.74% estimation process
2012 13,489 -1.45% estimation process
2013 13,427 -0.46% estimation process
2014 13,128 -2.28% estimation process
2015 13,094 -0.26% estimation process
2016 12,828 -2.07% estimation process
2017 12,726 -0.8% estimation process
2018 12,567 -1.27% estimation process
2019 12,285 -2.3% estimation process
2020 12,216 -0.56% estimation process

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People born in Trinity County (2)

People born in Trinity County, including Criminal, author, and recipient of Presidential pardon, from the U.S. state of Oregon. Stephen Arnold Douglas Puter, judge Jesse W. Carter, .


Other places with the same name (2)

California Other Counties (more counties)

County Name Population Title
Los Angeles County 9,943,046 County in California, United States of America
Los Angeles 3,970,219 The second most populous city in the United States and the center of the Los Angeles metropolitan area.
San Diego County 3,332,427 San Diego County, founded in 1850, is one of 58 counties in the US state of California.
Orange County 3,166,857 County in California, United States
Riverside County 2,489,188 County in California, United States
San Bernardino County 2,189,183 County in California, United States
Santa Clara County 1,907,105 County in California, United States
Alameda County 1,662,323 County in California, United States
Sacramento County 1,559,146 County in California, United States
San Diego 1,422,420 The eighth most populous city in the United States and the center of the San Diego metropolitan area.
Laguna 1,370,232 A city located in Orange County, California.
Contra Costa County 1,152,333 County in California, United States
San Jose 1,013,616 The tenth most populous city in the United States and the center of the San Jose metropolitan area.
Fresno County 1,000,918 County in California, United States
Kern County 901,362
San Francisco County 866,606 County, coextensive with the city of San Francisco, California, United States