California, United States Genealogy

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Guide to California ancestry, family history, and genealogy birth records, marriage records, death records, census records, family history, and military records.

California Information

California became the thirty-first state admitted to the Union in September 9, 1850. California was created from part of unorganized territory called Mexican Cession (Mexico ceded the land to the U. S. in the Treaty of Guadalupe Hildago in 1848) and is located in the southwest region of the United States.[1] Sacramento is the capital and there are 58 counties in California. [2]

Getting Started

Getting Started with California Research

Links to articles on getting started with California research.

California Research Tools

Links to articles and websites that assist in California research.

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California Clickable Map

Many genealogy records are kept on the county level in the United States. Click on a county below to go to the county Wiki article listing more information.

Del NorteSiskiyou CountyModoc CountyHumboldt CountyTrinity CountyShasta CountyLassen County, CaliforniaMendocino CountyTehama CountyPlumas CountyGlenn CountyButte CountyLake CountySierra CountyColusa CountyYuba CountySutter CountyNevada CountySonoma CountyNapa CountyYolo CountyPlacer CountyEl Dorado CountySacramento CountySolano CountyMarin CountyContra Costa CountySan Joaquin CountyAmador CountyAlpine CountySan Francisco CountySan Mateo CountyAlameda CountyCalaveras CountyTuolumne CountyStanislaus CountySanta Clara CountyMono CountySanta Cruz CountyMerced CountyMariposa CountyMadera CountyFresno CountySan Benito CountyMonterey CountyKings CountyTulare CountyInyo CountySan Luis Obispo CountySanta Barbara CountyKern CountyVentura CountyLos Angeles CountySan Bernardino CountyOrange CountyRiverside CountySan Diego CountyImperial CountyCalifornia-county-map.gif


Extinct or Renamed Counties:  Branciforte · Klamath · Lake (Nevada) · Pautah · Roop · Nataqua Territory

California Migration Routes


FamilySearch Resources

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Below are FamilySearch resources that can assist you in resourcing your family.

Additional Resources


  1. Wikipedia contributors, "California" in Wikipedia: the Free Encyclopedia at (accessed 15 March 2016).
  2. Wikipedia contributors, "List of US States by Date of Admission," in Wikipedia: the Free Encyclopedia,, accessed 1 Nov 2016.
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