County Population, California |
(2010 --- U.S. Census Bureau) Total, 38,332,521 - 2013 estimate |
County Seats cs |
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County Population |
(Largest to Smallest) |
| 1. Los Angeles 9,818,605 | 20. Monterey 415,057 | 40. Lake 64,665 |
| 2. San Diego 3,095,313 | 21. Solano 413,344 | 41. Tehama 63,463 |
| 3. Orange 3,010,232 | 22. Placer 348,432 | 42. San Benito 55,269 |
| 4. Riverside 2,189,641 | 23. San Luis Obispo 269,637 | 43. Tuolumne 55,365 |
| 5. San Bernardino 2,035,210 | 24. Santa Cruz 262,382 | 44. Calaveras 45,578 |
| 6. Santa Clara 1,781,642 | 25. Merced 255,793 | 45. Siskiyou 44,900 |
| 7. Alameda 1,510.271 | 26. Marin 252,409 | 46. Amador 38,091 |
| 8. Sacramento 1,418,788 | 27. Butte 220,000 | 47. Lassen 34,895 |
| 9. Contra Costa 1,049,025 | 28. Yolo 200,849 | 48. Del Norte 28,610 |
| 10. Fresno 930,450 | 29. El Dorado 181,058 | 49. Glenn 28,122 |
| 11. Kern 839,631 | 30. Shasta 177,223 | 50. Colusa 21,419 |
| 12. Ventura 823,318 | 31. Imperial 174,528 | 51. Plumas 20,007 |
| 13. San Francisco 805,235 | 32. Madera 150,865 | 52. Inyo 18,546 |
| 14. San Mateo 718,451 | 33. Kings 152,982 | 53. Mariposa 18,251 |
| 15. San Joaquin 685,306 | 34. Napa 136,484 | 54. Mono 14,202 |
| 16. Stanislaus 514,453 | 35. Humboldt 134,623 | 55. Trinity 13,786 |
| 17. Sonoma 483,878 | 36. Nevada 98,764 | 56. Modoc 9,686 |
| 18. Tulare 442,179 | 37. Sutter 94,737 | 57. Sierra 3,240 |
| 19. Santa Barbara 423,895 | 38. Mendocino 87,841 | 58. Alpine 1,175 |
| 39. Yuba 72,155 |
(Smallest to Largest) |
| 1. Alpine 1,175 | 20. Yuba 72,155 | 40. Santa Barbara 423,895 |
| 2. Sierra 3,240 | 21. Mendocino 87,841 | 41. Tulare 442,179 |
| 3. Modoc 9,686 | 22. Sutter 94,737 | 42. Sonoma 483,878 |
| 4. Trinity 13,786 | 23. Nevada 98,764 | 43. Stanislaus 514,453 |
| 5. Mono 14,202 | 24. Humboldt 134,623 | 44. San Joaquin 685,306 |
| 6. Mariposa 18,251 | 25. Napa 136,484 | 45. San Mateo 718,451 |
| 7. Inyo 18,546 | 26. Kings 152,982 | 46. San Francisco 805,235 |
| 8. Plumas 20,007 | 27. Madera 150,865 | 47. Ventura 823,318 |
| 9. Colusa 21,419 | 28. Imperial 174,528 | 48. Kern 839,631 |
| 10. Glenn 28,122 | 29. Shasta 177,223 | 49. Fresno 930,450 |
| 11. Del Norte 28,610 | 30. El Dorado 181,058 | 50. Contra Costa 1,049,025 |
| 12. Lassen 34,895 | 31. Yolo 200,849 | 51. Sacramento |
| 13. Amador 38,091 | 32. Butte 220,000 | 52. Alameda 1,510.271 |
| 14. Siskiyou 44,900 | 33. Marin 252,409 | 53. Santa Clara 1,781,642 |
| 15. Calaveras 45,578 | 34. Merced 255,793 | 54. San Bernardino 2,035,210 |
| 16. Tuolumne 55,365 | 35. Santa Cruz 262,382 | 55. Riverside 2,189,641 |
| 17. San Benito 55,269 | 36. San Luis Obispo 269,637 | 56. Orange 3,010,232 |
| 18. Tehama 63,463 | 37. Placer 348,432 | 57. San Diego 3,095,313 |
| 19. Lake 64,665 | 38. Solano 413,344 | 58. Los Angeles 9,818,605 |
| 39. Monterey 415,057 |
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