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  • Alameda County News & Information Update 11/20/20 November 20, 2020
    News & Information Update November 20, 2020 Limited Stay at Home Order The State recently moved Alameda County to the purple tier and has announced a limited Stay at Home Order for counties in the purple tier. The order generally requires that non-essential work, movement, and gatherings stop between 10 p.m. and 5 a.m. PST. […]
  • Alameda County News & Information Update 11/18/20 November 18, 2020
    News & Information Update November 18, 2020 Alameda County Moved to Purple Tier The State has moved Alameda County back to the purple tier. Updated Alameda County Health Officer orders and other COVID-19 information is available on our COVID-19 website. Learn more about the shelter-in-place order and the reopening plan. LEARN MORE 2020 Women's Hall of Fame The […]
  • Alameda County News & Information Update 11/4/20 November 4, 2020
    News & Information Update November 4, 2020 Alameda County Election Results Results from the November 3 General election are available on our website. VIEW RESULTS 2020 Women's Hall of Fame Virtual Event The Women's Hall of Fame recognizes outstanding women for their achievements and contributions to Alameda County and its residents. The program honors women […]

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History of Almeda

The county was formed on March 25, 1853, from a large portion of Contra Costa County and a smaller portion of Santa Clara County.

The county seat at the time of the county’s formation was located at Alvarado, now part of Union City. In 1856, it was moved to San Leandro, where the county courthouse was destroyed by the devastating 1868 quake on the Hayward Fault. The county seat was then re-established in the town of Brooklyn from 1872-1875. Brooklyn is now part of Oakland, which has been the county seat since 1873.

Much of what is now considered an intensively urban region, with major cities, was developed as a trolley car suburb of San Francisco in the late 19th and early 20th centuries. The historical progression from Native American tribal lands to Spanish, then Mexican ranches, then to farms, ranches, and orchards, then to multiple city centers and suburbs, is shared with the adjacent and closely associated Contra Costa County.

 

County Seal

County Flag

Land Area

Area

  • Total 821 sq mi (2,130 km2)
  • Land 739 sq mi (1,910 km2)
  • Water 82 sq mi (210 km2)

Highest elevation[2]    3,843 ft (1,171 m)

Population (April 1, 2010)[3]

  • Total 1,510,271
  • Estimate (2017)[4] 1,663,190
  • Density 1,800/sq mi (710/km2)

Population History

Historical population
Census Pop.
1860 8,927
1870 24,237 171.5%
1880 62,976 159.8%
1890 93,864 49.0%
1900 130,197 38.7%
1910 246,131 89.0%
1920 344,177 39.8%
1930 474,883 38.0%
1940 513,011 8.0%
1950 740,315 44.3%
1960 908,209 22.7%
1970 1,073,184 18.2%
1980 1,105,379 3.0%
1990 1,279,182 15.7%
2000 1,443,741 12.9%
2010 1,510,271 4.6%
Est. 2017 1,663,190 [4] 10.1%