The O'Brien Clan
California Chapter #1
The following is a list of all the Counties in California and volunteers agreeing to help individuals find information within those counties. You can go to the individual County and look for information or contact an O'Brien volunteer to help you with your research. Volunteers are always needed.
| Chapter # |
County | Date Formed |
Parent County | County Seat | Contact Name |
|---|---|---|---|---|---|
| Alameda | 1853 | Contra Costa, Santa Clara | Oakland | Shannon M. O'Brien | |
| Alpine | 1864 | Eldorado, Amador, Calaveras | Markleeville | (Volunteer Needed) | |
| Amador | 1854 | Calaveras | Jackson | (Volunteer Needed) | |
| Butte | 1850 | Original County | Oroville | (Volunteer Needed) | |
| Calaveras | 1850 | Original County | San Andreas | (Volunteer Needed) | |
| Colusa | 1850 | Original County | Colusa | (Volunteer Needed) | |
| Contra Costa | 1850 | Original County | Martinez | (Volunteer Needed) | |
| Del Norte | 1857 | Klamath | Crescent City | (Volunteer Needed) | |
| El Dorado | 1850 | Original County | Placerville | (Volunteer Needed) | |
| Fresno | 1856 | Merced, Mariposa | Fresno | (Volunteer Needed) | |
| Glenn | 1891 | Colusa | Willows | (Volunteer Needed) | |
| Humboldt | 1853 | Trinity | Eureka | (Volunteer Needed) | |
| Imperial | 1907 | San Diego | El Centro | (Volunteer Needed) | |
| Inyo | 1866 | Tulare | Independence | (Volunteer Needed) | |
| Kern | 1866 | Tulare, Los Angeles | Bakersfield | (Volunteer Needed) | |
| Kings | 1893 | Tulare, Fresno | Hanford | (Volunteer Needed) | |
| Lake | 1861 | Napa | Lakeport | (Volunteer Needed) | |
| Lassen | 1864 | Plumas, Shasta | Susanville | (Volunteer Needed) | |
| Los Angeles | 1850 | Original County | Los Angeles | (Volunteer Needed) | |
18 |
South Bay (L.A.) | Area south of LAX, including El Segundo, all the Beach cities and all cities within 30 min of Redondo Beach |
Los Angeles | James O'Neill O'Brien | |
| Madera | 1893 | Mariposa, Fresno | Madera | (Volunteer Needed) | |
| Marin | 1850 | Original County | San Rafael | (Volunteer Needed) | |
| Mariposa | 1850 | Original County | Mariposa | (Volunteer Needed) | |
| Mendocino | 1850 | Original County | Ukiah | (Volunteer Needed) | |
| Merced | 1855 | Mariposa | Merced | (Volunteer Needed) | |
| Modoc | 1874 | Siskiyou | Alturas | (Volunteer Needed) | |
| Mono | 1861 | Calaveras, Fresno | Bridgeport | (Volunteer Needed) | |
| Monterey | 1850 | Original County | Salinas | Mike O'Brien | |
| Napa | 1850 | Original County | Napa | (Volunteer Needed) | |
| Nevada | 1851 | Yuba | Nevada City | (Volunteer Needed) | |
| Orange | 1889 | Los Angeles | Santa Ana | Paul Brien | |
| Placer | 1851 | Yuba, Sutter | Auburn | (Volunteer Needed) | |
| Plumas | 1854 | Butte | Quincy | (Volunteer Needed) | |
| Riverside | 1893 | San Diego, San Bernardino | Riverside | Diana J. O'Brien | |
| Sacramento | 1850 | Original County | Sacramento | (Volunteer Needed) | |
| San Benito | 1874 | Monterey | Hollister | (Volunteer Needed) | |
| San Bernardino | 1853 | Los Angeles | San Bernardino | Bob & Ellie O'Brien | |
| San Diego | 1850 | Original County | San Diego | (Volunteer Needed) | |
| San Francisco | 1850 | Original County | San Francisco | (Volunteer Needed) | |
| San Joaquin | 1850 | Original County | Stockton | (Volunteer Needed) | |
| San Luis Obispo | 1850 | Original County | San Luis Obispo | (Volunteer Needed) | |
| San Mateo | 1856 | San Francisco | Redwood City | (Volunteer Needed) | |
| Santa Barbara | 1850 | Original County | Santa Barbara | (Volunteer Needed) | |
| Santa Clara | 1850 | Original County | San Jose | (Volunteer Needed) | |
| Santa Cruz | 1850 | Original County | Santa Cruz | (Volunteer Needed) | |
| Shasta | 1850 | Original County | Redding | (Volunteer Needed) | |
| Sierra | 1852 | Yuba | Downieville | (Volunteer Needed) | |
| Siskiyou | 1852 | Shasta, Klamath, Oregon | Yreka | (Volunteer Needed) | |
| Solano | 1850 | Original County | Fairfield | (Volunteer Needed) | |
| Sonoma | 1850 | Original County | Santa Rosa | Shannon L. O'Brien | |
| Stanislaus | 1854 | Tuolumne | Modesto | (Volunteer Needed) | |
| Sutter | 1850 | Original County | Yuba | (Volunteer Needed) | |
| Tehama | 1856 | Colusa, Butte, Shasta | Red Bluff | (Volunteer Needed) | |
| Trinity | 1850 | Original County | Weaverville | (Volunteer Needed) | |
| Tulare | 1852 | Mariposa | Visalia | (Volunteer Needed) | |
| Tuolumne | 1850 | Original County | Sonora | William Houston | |
| Ventura | 1872 | Santa Barbara | Ventura | Patricia O'Brien McCarley | |
| Yolo | 1850 | Original County | Woodland | (Volunteer Needed) | |
| Yuba | 1850 | Original County | Marysville | (Volunteer Needed) |
For links to California Genealogy and research, click here.
To send comments and suggestions for
improving this site or to add new information that may be useful to others, please drop me
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