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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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