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Welcome To Genealogy Trails for Contra Costa County, California!

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Contra Costa County was one of the original counties of
California created in 1850 at time California made statehood. The
was originally named Mt. Diablo County, The name was changed prior
to its incorporation as a county. The county's name means in Spanish
language opposite coast, on account of it's location opposite of San
Francisco, in an easterly direction, on the San Francisco By.
Southern parts of the county's territory, including all of the
bayside area opposite San Francisco, and Northern portions of Santa
Clara County were given up in 1853 to form Alameda county.
Land titles in Contra Costa County may be traced to multiple
subdivisions of a few original Spanish land grants from the King of
Spain. Some of the towns, Martinez, Pacheco and Moraga claiming
their names from the Spanish people who settled here. Borges Ranch
has been preserved at a working demonstration ranch.
Much history to the beginning of the State of California can be
found in this county.
Contra Costa County is divided into three sections. West County,
Central County, and East County. This came about due to suburban
development, industrial development, bay area of shipping.
Contra County is the home of Mt. Diablo which has
a very interesting beginnings, or Indian story attached to it.County
Seat : Martinez
Incorporated : 1850
Square Miles: 802

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