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Renamed Counties:
Branciforte - formed 18 Feb 1850 from California lands, renamed Santa Cruz 19 Apr 1850
Klamath - formed 18 Feb 1850, reorganized to form Siskiyou 22 Mar 1852
Mann - no further information other than from 1 of 7 sources used by Ronald V. Jackson. Apparently never was formally organized.

State
CA0001 = American biography and genealogy, California edition (1910) 399 biographies

Counties:
  1. Alameda - 25 Mar 1853
  2. Amador - 1 May 1854
  3. Butte - 18 Feb 1850
  4. Calaveras - 18 Feb 1850
  5. Colusa - 18 Feb 1850
  6. Contra Costa - 18 Feb 1850
  7. Del Norte - 2 Mar 1857
  8. El Dorado - 18 Feb 1850
  9. Fresno - 19 Apr 1856
  10. Glenn - 11 Mar 1881
  11. Humboldt - 12 May 1853
  12. Imperial - 6 Aug 1907
  13. Inyo - 22 Mar 186
  14. Kern - 2 Apr 1866
  15. Kings - 22 Mar 1893
  16. Lake - 20 May 1861
  17. Lassen - 1 Apr 1864
  18. Los Angeles - 18 Feb 1850
  19. Madera - 11 Mar 1893
  20. Marin - 18 Feb 1850
  21. Mariposa - 18 Feb 18502
  22. Mendocino - 18 Feb 1850
  23. Merced - 19 Apr 1855
  24. Modoc - 17 Feb 1874
  25. Mono - 24 Apr 1864
  26. Monterey - 18 Feb 1850
  27. Napa - 18 Feb 1850
  28. Nevada- 25 Apr 1851
  29. Orange - 11 Mar 1889
  30. Placer - 25 Apr 1851
  31. Plumas - 18 Mar 1854
  32. Riverside - 11 Mar 1893
  33. Sacramento - 18 Feb 1850
  34. San Benito - 12 Feb 1874
  35. San Bernardino - 26 Apr 1853
  36. San Diego - 18 Feb 1850
  37. San Francisco - 18 Feb 1850
  38. San Joaquin - 18 Feb 1850
  39. San Luis Obispo - 18 Feb 1850
  40. San Mateo - 18 Feb 185
  41. Santa Barbara - 19 Apr 1850
  42. Santa Clara - 18 Feb 1850
  43. Santa Cruz - 18 Feb 1850
  44. Shasta - 18 Feb 1850
  45. Sierra - 16 Feb 1852 from Yuba
  46. Siskiyou - 22 Mar 1852
  47. Solano - 18 Feb 1850
  48. Sonoma - 18 Feb 1850
  49. Stanislaus - 1 Apr 1854
  50. Sutter - 18 Feb 1850
  51. Tehama - 9 Apr 1856
  52. Trinity - 18 Feb 1850
  53. Tulare - 20 Apr 1852
  54. Tuolumne - 18 Feb 1850
  55. Ventura - 22 Mar 1872
  56. Yolo - 18 Feb 1850
  57. Yuba - 18 Feb 1850
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