Brief
History:
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 to 1875.
Brooklyn is now part of Oakland, which has
been the
county seat since 1873.
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