County Seal

County Info


  • Total 8,310 km2 (3,208 sq mi)
  • Land 8,230 km2 (3,179 sq mi)
  • Water 70 km2 (28 sq mi)

Population (April 1, 2010)[2]

  • Total 13,786
  • Estimate (2016)[3] 12,782
  • Density 1.7/km2 (4.3/sq mi)


The county takes its name from the Trinity River, named in 1845 by Major Pierson B. Reading, who was under the mistaken impression that the river emptied into Trinidad Bay. Trinity is the English translation of Trinidad.

Trinity County was one of the original counties of California, created in 1850 at the time of statehood. Parts of the county were given to Klamath County in 1852 and to Humboldt County in 1853.