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    NOVEMBER 15
1856 - Ephraim Willard Burr, elected mayor of San Francisco in San Francisco County, California (1856-October 3, 1859).

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1800 CALIFORNIA 1900

Updated November 15, 2008 - 576 TOPICS
1800

50 YEARS BEFORE CALIFORNIA'S RATIFICATION OF THE U.S. CONSTITUTION

  1. Joaquin Higuera, appointed alcalde of Los Angeles in Los Angeles County, California (1800-1802).
  2. January 16, Pedro de Alberni, appointed acting governor of California (1800-March 11, 1802).
1802
  1. Mariano Verdugo, appointed second-term alcalde of Los Angeles in Los Angeles County, California (1802-1809).
  2. March 11, José Joaquin de Arillaga, appointed second-term governor of California (1802-July 25, 1814).
1803
  1. San Diego's first mission 'Mission San Diego de Alcala', in San Diego County, California, destroyed by an earthquake.
  2. NOVEMBER 30 - LOUISIANA PURCHASE
1805
  1. Rio de los Santos Reyes (Kings River) in Kings County, California, discovered by an exploring expedition.
1806
  1. A Spanish expedition headed by Lt. Ruiz and Zalvidea passed through the Tehachapi area in Kern County, California, looking after Native Americans fugitives.
  2. José de la Guerra y Noriega, appointed acting commandant of San Diego in San Diego County, California (1806-1807).
  3. March 1, Luis Antonio Arguello, appointed commandant of San Francisco in San Francisco County, California (1806-March 27, 1830).
1807
  1. José Raimundo Carrillo, appointed commandant of San Diego in San Diego County, California (1807-1809).
1809
  1. Francisco Maria Ruiz, appointed acting commandant of San Diego in San Diego County, California (1809-1820).
1810
  1. Fontana part of the Rancho San Antonio land grant in San Bernardino County, California. Coordinates 34°06'N-117°26'W.
  2. Francisco Avila, appointed alcalde of Los Angeles in Los Angeles County, California (1810-1811).
  3. Ignacio de Corral appointed commandant of San Diego in San Diego County, California (1810-1820).
  4. May 20, Francisco Dumatz, a Franciscan missionary entered an area in California, today named San Bernardino County.
1811
  1. Manuel Gutiérrez, appointed alcalde of Los Angeles in Los Angeles County, California (1811-1812).
1812
  1. An early European settlement, La Purisima Mission in the Lompoc Valley, California, destroyed by an earthquake.

  2. Mission San Diego de Alcala in San Diego County, California, for the second time destroyed by an earthquake.
  3. Guillermo Soto, appointed commissioner of Los Angeles in Los Angeles County, California (1812-1816).
1813
  1. Restoring of the La Purisima Mission in the Lompoc Valley, now a California State Park, after being destroyed by an earthquake.
1814
  1. July 25, José Dario Arguello, appointed acting governor of California (1814-August 15, 1815).
1815
  1. The Grandos expedition visited the Tehachapi region in California to recapture Native Americans escaped from missions.
  2. August 15, Pablo Vicente Sola, appointed governor of California (1815-November 22, 1822).
1816
  1. Antonio Maria Lugo, appointed alcalde of Los Angeles in Los Angeles County, California (1816-1819).
1819
  1. Anastasio Avila, appointed alcalde of Los Angeles in Los Angeles County, California (1819-1822).
1820
  1. Berkeley in California, granted to the Peralta family, orginally part Rancho San Antonio.
  2. October 20, José Antonio Estudillo, appointed commandant of San Diego in San Diego County, California (1820-September 1821).
1821
  1. September, Francisco Maria Ruiz, appointed second-term commandant of San Diego in San Diego County, California (1821-1827).
1822
  1. Spanish land - in today's Tehachapi region in California - became part of the Republic of Mexico.
  2. Manuel Gutiérrez, appointed second-term alcalde of Los Angeles in Los Angeles County, California (1822-1824).
  3. Ignacio Martinez, appointed acting commandant of San Francisco in San Francisco County, California (1822-October 1825).
  4. 1822 - San Francisco born Luis Antonio Arguello, first native appointed governor, under Mexican Rule, of Alta California (1822-June 25, 1825).
1824
  1. Guillermo Cota, appointed second-term alcalde of Los Angeles in Los Angeles County, California.
  2. Encarnacion Urquides, appointed alcalde of Los Angeles in Los Angeles County, California.
  3. October 14, California became Territory of Alta California.
1825
  1. José Maria Avila, appointed alcalde of Los Angeles in Los Angeles County, California.
  2. June 25 - José Maria de Echeandia, appointed governor of California (1825-January 31, 1831).
1826
  1. José Antonio Carrillo, appointed alcalde of Los Angeles in Los Angeles County, California.
  2. Claudio Lopez, appointed alcalde of Los Angeles in Los Angeles County, California (1826-1827).
1827
  1. The first American entering the Tehachapi area in California was trapper Jedediah Strong Smith.
  2. Guillermo Cota, appointed third-term alcalde of Los Angeles in Los Angeles County, California (1827-1828).
  3. José Antonio Estudillo, appointed second-term commandant of San Diego in San Diego County, California (1827-April 8, 1830).
1828
  1. José Antonio Carrillo, appointed second-term alcalde of Los Angeles in Los Angeles County, California (1828-1829).
  2. Ignacio Martinez, appointed second-term commandant of San Francisco in San Francisco County, California (1828-1831).
1829
  1. Guillermo Soto, appointed alcalde of Los Angeles in Los Angeles County, California (1829-1830)
1830
  1. Tiburcio Tapia, appointed alcalde of Los Angeles in Los Angeles County, California (1830-1831).
  2. April 8, Santiago Arguello, appointed commandant of San Diego in San Diego County, California (1830-1835).
1831
  1. Vicente Sanchez, appointed alcalde of Los Angeles in Los Angeles County, California (1831-1832).
  2. Mariano Guadalupe Vallejo, appointed commandant of San Francisco in San Francisco County, California (1831-1834).
  3. José Antonion Sanchez, appointed acting commandant of San Francisco in San Francisco County, California (1831-1833).
  4. January 31, Manuel Victoria, appointed governor of California (1831-December 6, 1832).
  5. December 6, José Maria de Echeandia, appointed second-term governor of California (1831-January 31, 1832).
1832
  1. Manuel Dominguez, appointed alcalde of Los Angeles in Los Angeles County, California (1832-1833).
  2. January 11, Pio de Jesus Pico, appointed governor of California (1832-January 31, 1832).
  3. January 11, José Maria de Echeandia appointed third-term governor (in opposition) of California (1832-January 31, 1832).
  4. January 31, Augustin Vicente Zamorano, appointed governor in North California (1832-January 15, 1833).
  5. January 31, José Maria de Echeandia, appointed governor in South California ( 1832-January 15, 1833).
1833
  1. José Antonio Carrillo, appointed third-term alcalde of Los Angeles in Los Angeles County, California (1833-1834)
  2. Damaso Rodriguez, appointed acting commandant of San Francisco in San Francisco County, California (1833-1834).
  3. January 15, José Figueroa appointed governor of California (1833-September 29, 1835).
1834
  1. José Perez, appointed alcalde of Los Angeles in Los Angeles County, California (1834-1835).
  2. Francisco de Haro, appointed alcalde of San Francisco in San Francisco County, California (1834-1835).
1835
  1. Francisco Javier Alvarado, appointed alcalde of Los Angeles in Los Angeles County, California (1835-1836).
  2. José Joaquin Estudillo, appointed alcalde of San Francisco in San Francisco County, California (1835-1836).
  3. January 1, San Diego became San Diego Pueblo in San Diego County, California.
  4. January 1, Juan Maria Osuna, appointed alcalde of San Diego in San Diego County, California (1835-1836).
  5. August 29, José Castro, appointed acting governor of California (1835-January 2, 1836).
1836
  1. Manuel Requena, appointed alcalde of Los Angeles in Los Angeles County, California (1836-1837).
  2. Santiago Arguello, appointed alcalde of San Diego in San Diego County, California (1836-1837).
  3. Francisco Guerrero, appointed alcalde of San Francisco in San Francisco County, California (1836-1837).
  4. January 2, Nicolas Gutiérrez, appointed acting governor of California (1836-May 1, 1836).
  5. May 1, Mariano Chico, appointed governor of California (1836-July 30, 1836).
  6. May 30, Nicolas Gutiérrez, appointed second-term acting governor of California (1836-September 5, 1836).
  7. June 14, California became a department of Las Californias.
  8. September 5, Juan Bautista Alvarado, appointed governor of California (1836-December 30, 1842).
1837
  1. José Sepulveda, appointed alcalde of Los Angeles in Los Angeles County, California.
  2. José Antonio Estudillo, appointed alcalde of San Diego in San Diego County, California (1837-1839).
  3. Ignacio Martinez, appointed alcalde of San Francisco in San Francisco County, California (1837-1838).
1838
  1. Luis Arena, appointed alcalde of Los Angeles in Los Angeles County, California (1838-1839).
  2. Francisco de Haro, appointed second-term alcalde of San Francisco in San Francisco County, California (1838-1839).
1839
  1. José Sepulveda and Tiburcio Tapia, appointed joint alcaldes of Los Angeles in Los Angeles County, California (1839-1840).
  2. Juan Maria Marron, appointed alcalde of San Diego in San Diego County, California (1839-1841).
  3. Francisco Guerrero, appointed second-term alcalde of San Francisco in San Francisco County, California (1839-1842).
1841
  1. Azusa, part of El Susa Rancho given to Luis Arenas, as Mexican land grant, Los Angeles County, California.
  2. Ignacio Alvarado and Ignacio Palomares, appointed Justices of the Peace of Los Angeles in Los Angeles County, California.
  3. Rosario E. Aguilar, appointed alcalde of San Diego in San Diego County, California.
  4. Jésus Moreno, appointed substitute alcalde of San Diego in San Diego County, California.
1842
  1. The Lugo family was granted the Rancho San Bernardino, or the entire San Bernardino Valley in San Bernardino County, California.
  2. Manuel Dominguez and José Sepulveda, appointed Justices of the Peace of Los Angeles in Los Angeles County, California.
  3. José Antonio Congora, appointed alcalde of San Diego in San Diego County, California.
  4. José Maria Alvarado, appointed substitute alcalde of San Diego in San Diego County, California.
  5. December 30, José Manuel Micheltorena, appointed governor of California (1842-February 22, 1845).
  6. José de Jesus Noe, appointed alcalde of San Francisco in San Francisco County, California (1842-1843).
1843
  1. Antonio F. Coronel and Manuel Dominguez, appointed Justices of the Peace of Los Angeles in Los Angeles County, California.
  2. José Joaquin Ortega, appointed alcalde of San Diego in San Diego County, California (1843-May 1843).
  3. Francisco Sanchez, appointed alcalde of San Francisco in San Francisco County, California (1843-1844).
  4. May, José Antonio Congora, appointed second-term alcalde of San Diego in San Diego County, California.
  5. José Maria Orozco, appointed substitute alcalde of San Diego in San Diego County, California.
1844
  1. Lake Tahoe in California, first seen by explorer John C. Fremont, he named it Lake Bonpland, later it changed in Mountain Lake and Lake Bigler.
  2. Manuel Requena, appointed first alcalde of Los Angeles in Los Angeles County, California (1844-1845).
  3. Tiburcio Tapia, appointed second alcalde of Los Angeles in Los Angeles County, California (1844-1845).
  4. Juan Maria Marron, appointed second-term alcalde of San Diego in San Diego County, California.
  5. Thomas Wrightington, appointed substitute alcalde of San Diego in San Diego County, California.
  6. William Sturgis Hinckley, appointed alcalde of San Francisco in San Francisco County, California (1844-1845).
1845
  1. Vicente Sanchez, appointed first alcalde of Los Angeles in Los Angeles County, California (1845-1846).
  2. Juan Sepulveda, appointed second alcalde of Los Angeles in Los Angeles County, California (1745-1846).
  3. Francisco Maria Alvarado, appointed alcalde of San Diego in San Diego County, California.
  4. José Antonio Estudillo, appointed second-term temporary alcalde of San Diego in San Diego County, California.
  5. José Ramon Arguello, appointed substitute alcalde of San Diego in San Diego County, California.
  6. Juan Nepomuceno Padilla, appointed alcalde of San Francisco in San Francisco County, California.
  7. José de la Cruz Sanchez, appointed alcalde of San Francisco in San Francisco County, California (1845-1846).
  8. February 22, Pio de Jesus Pico, appointed second-term governor of California (1845-July 7, 1846).
1846
  1. Catalina Island, land grant awarded to Thomas Robiins by Governor Pio Pico, in Los Angeles County, California.
  2. Juan Gallardo, appointed first alcalde of Los Angeles in Los Angeles County, California (1846-1847).
  3. José L. Sepulveda, appointed second alcalde of Los Angeles in Los Angeles County, California (1846-1847).
  4. José Antonio Estudillo, appointed third-term alcalde of San Diego in San Diego County, California.
  5. Miguel Pedrorena, appointed alcalde of San Diego in San Diego County, California.
  6. José de Jesus Noe, appointed second-term alcalde of San Francisco in San Francisco County, California.
  7. Battle of San Pasqual fought between California forces and U.S. troops near Escondido in San Diego County, California.
  8. June 14, California proclaimed California Republic.
  9. June 14, William Brown Ide, appointed president of California (1846-July 9, 1846).
  10. July, Washington Allon Bartlett, appointed alcalde of San Francisco in San Francisco County, California (1846-February 1847).
  11. July 7, California under United States occupation.
  12. July 7, John Drake Sloat, appointed military governor ofd California (1846-July 29, 1846).
  13. July 29, Robert Field Stockton, appointed military governor of California (1846-January 19, 1847).
  14. August, José Joaquin Ortega, appointed second-term alcalde of San Diego in San Diego County, California.
  15. August, Henry D. Fitch, appointed substitute alcalde of San Diego in San Diego County, California (1846-June 1847).
  16. October 31, José Maria Flores, appointed governor (in opposition) of California (1846-January 11, 1847).
1847
  1. José Salazar, appointed first alcalde of Los Angeles in Los Angeles County, California (1847-1848).
  2. Enrique Avila, appointed second alcalde of Los Angeles in Los Angeles County, California (1847-1848).
  3. Philip Crosthwaite, appointed substitute alcalde of San Diego in San Diego County, California.
  4. Thomas Wrightington, appointed second-term substitute alcalde of San Diego in San Diego County, California (1847-March 1848).
  5. January 9, United States takes possession of Los Angeles in Los Angeles County, California.
  6. January 11, Andrés Pico, appointed governor (in opposition) of California (1847-January 13, 1847).
  7. January 19, John Charles Fremont, appointed military governor of California (1847-March 1, 1847).
  8. February 22, Edwin Bryant, appointed alcalde of San Francisco in San Francisco County, California (1847-June 1847).
  9. March 1, Stephen Watts Kearny, appointed military governor of California (1847-May 31, 1847).
  10. May 31, Richard Barnes Mason, appointed acting military governor of California (1847-February 28, 1849).
  11. June, Robert Clift, appointed alcalde of San Diego in San Diego County, California.
  12. June, George Hyde, appointed alcalde of San Francisco in San Francisco County, California (1847-April 1848).
1848
  1. Angels Camp, founded by Henry Angel a Rhode Island shopkeeper, located in Calaveras County, California.
  2. Jose Maria Amador and several Native Americans, established a gold mining camp near Amador in Amador County, California.
  3. Mokelumne Hill (Moke Hill) founded, located in Calaveras County, California.
  4. Stephen C. Foster, appointed mayor of Los Angeles in Los Angeles County, California (1848-July 1, 1850).
  5. Ignacis Palomores, appointed first alcalde of Los Angeles in Los Angeles County, California.
  6. José Sepulveda, appointed second alcalde of Los Angeles in Los Angeles County, California.
  7. E.L. Brown, appointed alcalde of San Diego in San Diego County, California.
  8. January, gold discovered at Coloma in El Dorado, California, by James W. Marshall.
  9. February 2, California ceded to the U.S. by Mexico by the Guadeloupe Hidalgo Treaty.
  10. March 29, Juan Bandini, appointed alcalde of San Diego in San Diego County, California (1848-September 27, 1848).
  11. April, John Townsend, appointed alcalde of San Francisco in San Francisco County, California (1848-September 1848).
  12. May 16, gold discovered by Claude Chana in Auburn Ravine, Placer County, California.
  13. October, Thaddeus M. Leavenworth, appointed alcalde of San Francisco in San Francisco County, California (1848-August 1849).
  14. October 3, Juan Maria Marron, appointed alcalde of San Diego in San Diego County, California ( 1848-1849).
  15. December, Sacramento founded in Sacramento County, California.
1849
  1. Antioch, founded as Smith's Landing in Contra Costa County, California. Located on the San Joaquin River. Coordinates 38°01'N-121°49'W.
  2. Auburn Ravine, a gold mining camp, officially named Auburn in Placer County, California.
  3. Gold rush in Central Valley(Great Valley), California.
  4. A.M. Winn, appointed mayor of Sacramento in Sacramento County, California.
  5. Dennis Gahagan, appointed alcalde of San Diego in San Diego County, California (1849-1850).
  6. February 28, Persifor Frazer Smith, appointed military governor of California (1849-April 12, 1849).
  7. April 12, Bennett Riley, appointed military governor of California (1849-December 20, 1849).
  8. August, John White Geary, appointed alcalde of San Francisco in San Francisco County, California (1849-March 1, 1850).
  9. August 1, Sacramento local government organized in Sacramento County, California.
  10. December 3, request from the Territory of California, to be admitted to the Union with a constitution prohibiting slavery (Compromise of 1850).
  11. December 20, Peter Hardeman Burnett, appointed governor of California (1849-January 9, 1851).
1850
  1. California population 92,597 residents.
  2. September 9, California CA, 31st state admitted to the Union
    California Today : capital Sacramento, area 163,707 sq.mi.(424.001km²) 3rd largest state. Counties 58 : Alameda, Alpine, Amador, Butte, Calaveras, Colusa, Contra Costa, Del Norte, El Dorado, Fresno, Glenn, Humboldt, Imperial, Inyo, Kern, Kings, Lake, Lassen, Los Angeles, Madera, Marin, Mariposa, Mendocino, Merced, Modoc, Mono, Monterey, Napa, Nevada, Orange, Placer, Plumas, Riverside, Sacramento, San Benito, San Bernardino, San Diego, San Francisco, San Joaquin, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Stanislaus, Sutter, Tehama, Trinity, Tulare, Tuolumne, Ventura, Yolo, Yuba. Attractions & Recreation : Afton Canyon, Aqua Caliente Cultural Museum, Alabama Hills Recreation Management Area, Alcatraz Island, Alturas Recreation Area, American River North Middle South Forks, Angeles National Forest, Antioch Dunes National Wildlife Refuge, Arcata Recreation Management Area, Autry Museum of Western Heritage, Bakersfield Recreation Sites, Barstow Field Recreation Site, Big Morongo Canyon Preserve, Bishop Field Ofiice Recreation Sites, Bitter Creek National Wildlife Refuge, Bizz Johnson Trail, Black Butte Lake, Blackhawk Museum, Blue Ridge National Wildlife Refuge, Boca Reservoir, Bradshaw Trail, Brea Dam, Butte Sink Wildlife Management Area, Cabrillo National Monument, Cache Creek Recreation Area, Cachuma Lake, California Coastal National Monument, California Desert Conservation Area, California Science Center, Carbon Canyon Dam, Carrizo Plain National Monument, Carson Pass Information Station, Cerritos Library, Chabot Space & Science Center, Channel Islands National Marine Sanctuary, Chappie/Chasta Off-Highway Vehicle Recreation Area, Chilao Visitor Center, Cleveland National Forest, Coleman National Fish Hatchery, Contra Loma Reservoir, Cordell Bank National Marine Sanctuary, Cosumnes River Preserve, Cow Mountain Recreation Management Area, Dave Moore Nature Area, Death Valley National Park, Devils Postpile National Monument, Don Edwards San Francisco Bay National Wildlife Refuge, Dos Palmas Preserve, Dumont Dunes, East Park Reservoir, Eastman Lake, El Mirage Recreation Management Area, Eldorado National Forest, Elkhorn Slough National Estuarine Research Reserve, Eugene O'Neil National Historic Site, Fish Slough Area of Critical Environmental Concern, Folsom Dam, Folsom Lake, Folsom Recreation Management Area, Folsom S. Canal Recreation Trail, Fort Ord, Fort Point National Historic Site, Fullerton Dam, Golden Gate National Recreation Area, Grassy Hollow Visitor Center, Guadalupe-Nipomo Dunes National Wildlife Refuge, Gulf of the Farallones National Marine Sanctuary, Hansen Dam, Harry L. Englebright Lake, Havasu National Wildlife Refuge, Hensley Lake, High Rock Canyon, Hopper Mountain National Wildlife Refuge, Imperial Reservoir Area-Picahco State Recreation Area, Inyo National Forest, Japanese American National Museum, Jawbone/Butterbredt Recreation Management Area, John Muir National Historic Site, Johnson Valley Off-Highway Vehicle Recreation Area, Joshua Tree National Park, Juan Bautista de Anza National Historic Trail, Juniper Flats, Kern National Wildlife Refuge, Keswick Reservoir, King Range National Conservation Area, Klamath National Forest, Lake Berryessa, Lake Cahuilla, Lake Casitas, Lake Kaweah, Lake Mendocino, Lake Natoma, Lake Solano, Lake Sonoma, Lake Tahoe Basin Management Unit, Lake Woollomes, Lassen National Forest, Lassen Volcanic National Park, Lava Beds National Monument, Lewiston National Recreation Area, Little Panoche Dam, Livingston Stone National Fish Hatchery, Los Banos Reservoir, Los Padres National Forest, Manzanar National Historic Site, Martis Creek Lake, Mendocino National Forest, Merced National Wildlife Refuge, Merced River Recreation Management Area, Millard Sheets Gallery, Millerton Lake, Modoc National Forest, Mojave National Preserve, Mojave River Dam, Molina Ghost Run Trail, Mono Basin Scenic Area Visitor Center, Monterey Bay National Marine Sanctuary, Mt. Baldy Schoolhouse Visitor Center, Muir Woods National Monument, Museum of Latin American Art,
  3. Alcatraz Island in San Francisco Bay, California, reserved by the U.S. government for military purposes. Coordinates 37°94'N-122°26'W.
  4. Gold discovered in Angels Camp, Calaveras County, California.
  5. Douglas Ottinger and Hans Buhne entered a bay in Humboldt County CA, and named it Humboldt Bay for explorer, Baron Alexander von Humboldt.

  6. Belmont settled as stagecoach station in San Mateo County, California. Coordinates 37°31'N-122°17'W.
  7. Eureka laid out in Humboldt County, California.
  8. A stagecoach stop established in Gilroy, Santa Clara County, California.
  9. Marin County established in California, seat San Rafael.
  10. Mariposa County established in California, seat Mariposa.
  11. Mendocino County established in California, seat Ukiah.
  12. Monterey County established in California, seat Salinas.
  13. Napa County established in California, seat Napa.
  14. Sacramento County established in California, seat Sacramento.
  15. San Diego established in California, seat San Diego.
  16. San Francisco County established in California, seat San Francisco.
  17. San Joaquin County established in California, seat Stockton.
  18. San Luis bispo County established in California, seat San Luis Obispo.
  19. Santa Barbara County established in California, seat Santa Barbara.
  20. Santa Clara County established in California, seat San Jose. Municipalities : Alviso, Blossom Valley, Campbell, Castro Center, Coyote, Cupertino, Gilroy, Holy City, Los Altos, Los Altos Hills, Los Gatos, Milpitas, Moffett Field, Monte Sereno, Monte Vista, Morgan Hill, Mountain View, Mount Hamilton, New Almaden, Onizuka AFB, Palo Alto, Permanente, Redwood Estates, San Jose, Santa Clara, San Martin, Saratoga, Stanford, Sunnyvale.
  21. Santa Cruz County established in California, seat Santa Cruz.
  22. Shasta County established in California, seat Redding.
  23. Solano County established in California, seat Fairfield.
  24. Sonoma County established in California, seat Santa Rosa.
  25. Sutter County established in California, seat Yuba City.
  26. Trinity County established in California, seat Weaverville.
  27. Tuolumne County established in California, seat Sonora.
  28. Yolo County established in California, seat Woodland.
  29. Yuba County established in California, seat Marysville.
  30. Hardin Bigelow, appointed mayor of Sacramento in Sacramento County, California.
  31. Horace Smith , appointed mayor of Sacramento in Sacramento County, California.
  32. February 18, Butte County created in California, county seat Oroville. Butte County Today : Cities : Biggs, Chico, Gridley, Oroville, Paradise.
  33. February 18, Calaveras County created in California. Named to the Calaveras River, county seat San Andreas. Cities : Angels Camp.
  34. February 18, Colusa County created in California, county seat Colusa. Cities: Colusa, Williams.
  35. February 18, Contra Costa County created in California, county seat Martinez. Cities : Antioch, Brentwood, Clayton, Concord, Danville, El Cerrito, Hercules, Lafayette, Martinez, Moraga, Oakley, Morinda, Pinole, Pittsburg, Pleasant Hill, Richmond, San Pablo, San Ramon, Walnut Creek.
  36. February 18, Eldorado County in California incorporated, county seat Placerville. Spanish name 'the gilded one'. Cities : Placerville, South Lake Tahoe
  37. February 18, Los Angeles County established. One of California's original 27 counties and one of the largest counties in the USA 4,084 sq/mi.(10.578 km²), and a 75 mi. (121 km) long coastline, county seat Los Angeles. Cities/Municipalities : Agoura Hills, Alhambra, Arcadia, Artesia, Avalon, Azusa, Baldwin Park, Bell, Bell Gardens, Bellflower, Beverly Hills, Bradbury, Burbank, Calabasas, Carson, Cerritos, Claremont, Compton, Covina, Cudahy, Culver City, Diamond Bar, Downey, Duarte, El Monte, El Segundo, Gardena, Glendale, Hawaiian Gardens, Hawthorne, Hermosa Beach, Hidden Hills, Huntington Park, Industry, Inglewood, Irwindale, La Canada-Flintridge, La Habra Heights, Lakewood, La Mirada, Lancaster, La Puente, La Verne, Lawndale, Lomita, Long Beach, Los Angeles, Lynwood, Malibu, Manhattan Beach, Maywood, Monrovia, Montebello, Monterey Park, Norwalk, Palmdale, Palos Verdes Estates, Paramount, Pasadena, Pico Rivera, Pomona, Rancho Palos Verdes, Redondo Beach, Rolling Hills, Rolling Hills Estates, Rosemead, San Dimas, San Fernando, San Gabriel, San Marino, Santa Clarita, Santa Fe Springs, Santa Monica, Sierra Madre, Signal Hill, South El Monte, South Gate, South Pasadena, Temple City, Torrance, Vernon, Walnut, West Covina, West Hollywood, Westlake Village, Whittier.
  38. February 27, Sacramento city incorporated in Sacramento County, California.
  39. Joshua Bean, appointed mayor of San Diego in San Diego County, California (1850-1851).
  40. March, Thomas W. Sutherland appointed acting alcalde of San Diego in San Diego County, California.
  41. March 1, John White Geary appointed mayor of San Francisco in San Francisco County, California (1850-May 5, 1851).
  42. March 21, San Diego city incorporated in San Diego County, California.
  43. March 27, San Jose incorporated in Santa Clara County, California.
  44. April 4, Los Angeles incorporated in Los Angeles County, California.
  45. April 8, Josiah Belden, elected mayor of San José in Santa Clara County, California (1850-1851).
  46. April 15, San Francisco city charter granted, San Francisco County, California.
  47. July 1, Alpheus P. Hodges, appointed mayor of Los Angeles in Los Angeles County, California (1850-May 7, 1851).
  48. September 9, San José in Santa Clara County, appointed capital of California.
  49. September 16, settlers arrived in the Antioch area, Contra Costa County, California.
1851
  1. Amador County in California settled, named for Jose Maria Amador, a wealthy rancher.
  2. Auburn, appointed seat of Placer County in California.
  3. The Mormon Colony purchased the Rancho San Bernardino (the entire San Bernardino Valley) from the Lugo family in San Bernardino County, California.
  4. Nevada County established in California, seat Nevada City.
  5. Placer County established in California, seat Auburn.
  6. Smith's Landing in Contra Costa County, California, renamed into Antioch.
  7. James R. Hardenberg, elected mayor of Sacramento in Sacramento County, California.
  8. David B. Kurtz, elected mayor of San Diego in San Diego County, California (1851-1852).
  9. Thomas White, elected mayor of San José in Santa Clara County, California (1851-1854).
  10. January 9, John McDougal, appointed acting governor of California (1851-January 8, 1852).
  11. May 5, Charles James Brenham, elected mayor of San Francisco in San Francisco County, California (1851-January 1, 1852).
  12. May 7, Benjamin David Wilson, elected mayor of Los Angeles in Los Angeles County, California (1851-May 4, 1852).
1852
  1. The first Sierra redwoood giant sequoia the 'Discovery Tree' noted in North Grove by Augustus T. Dowd in Calaveras County, California.
  2. First school established in the San Ysidro District, the Gilroy area in Santa Clara County, California.
  3. Sierra County established in California, seat Downieville.
  4. Siskiyou County established in California, seat Yreka.
  5. Tulare County established in California, seat Visalia.
  6. C.I. Hutchinson, elected mayor of Sacramento in Sacramento County, California.
  7. George P. Tebbetts, elected mayor of San Diego in San Diego County, California.
  8. Charles P. Noell, elected president of the Board of Trustees of San Diego in San Diego County, California
  9. Jales W. Robinson, elected president of the Board of Trustees of San Diego in San Diego County, California (1852-1853).
  10. January 1, Stephen Randall Harris, elected mayor of San Francisco in San Francisco County, California (1852-November 10, 1852).
  11. January 8, John Bigler, elected governor of California (1852-January 9, 1856).
  12. May 4, John Gregg Nichols, elected mayor of Los Angeles in Los Angeles County, California (1852-May 3, 1853).
  13. May 4, Oakland incorporated as town in Alameda County, California.
  14. November 10, Charles James Brenham, elected second-term mayor of San Francisco in San Francisco County, California (1852-October 3, 1853).
1853
  1. Andrew Broder, elected first Sheriff of Alameda County in California.
  2. College of California founded in Oakland, California.
  3. Ocean View(Berkeley) settled in Alameda County, California.
  4. The Keystone, a highly productive gold mine organized in Amador County, California.
  5. James R. Hardenberg, elected second-term mayor of Sacramento in Sacramento County, California
  6. Louis Rose, elected president of the Board of Trustees of San Diego in San Diego County, California (1853-1855).
  7. Public school opened in Gilroy, Santa Clara County, California.
  8. Benjamin D. Wilson, elected Los Angeles County Supervisor, in California.
  9. March 25, Alameda County created in California, seat Oakland. Cities : Alameda, Albany, Ashland, Berkeley, Castro Valley, Cherryland, Dublin, Emeryville, Fremont, Hayward, Livermore, Newark, Oakland, Piedmont, Pleasanton, San Leandro, San Lorenzo, Sunol, Union City.
  10. April 26, San Bernardino County created in California, from parts of Los Angeles, Mariposa and San Diego counties, seat San Bernardino. Cities : Adelanto, Apple Valley, Barstow, Big Bear Lake, Chino, Chino Hills, Colton, Crestline, Fontana, Grand Terrace, Hesperia, Highland, Joshua Tree, Lake Arrowhead, Loma Linda, Lucerne Valley, Montclair, Needles, Ontario, Rancho Cucamonga, Redlands, Rialto, Running Springs, San Bernardino, Twentynine Palms, Upland, Victorville, Wrightwood, Yermo, Yucaipa, Yucca Valley.
  11. May 3, Antonio F. Coronel, elected mayor of Los Angeles in Los Angeles County, California (1853-May 4, 1854).
  12. May 12, Humboldt County in California, incorporated, county seat Eureka. Named after Humboldt Bay. Cities: Arcata, Blue Lake, Eureka, Ferndale, Fortuna, Rio Dell, Trinidad.
  13. July 25, David Belasco born in San Francisco, San Francisco County, California. Actor, playwright and theatrical producer.
  14. October 3, Cornelius Kingsland Garrison, elected mayor of San Francisco in San Francisco County, California (1853-October 2, 1854).
1854
  1. Alameda city incorporated in Alameda County, California. Coordinates 37°46'N-112°16'W, located on an island in San Francisco Bay.
  2. Gold discovered in the Azusa valley, Los Angeles County, California.
  3. Colusi County in Cali