Genealogy Trails Contra Costa County California Genealogy Trails
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Welcome To Genealogy Trails for Contra Costa County, California!

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This county website is in need of a permanent host.
If you are interested joining our group as webmaster for this website, or any of our websites, view our
Volunteer Information page and Email Kim. A desire to transcribe data and know-how to make a basic webpage is required. We are a independent group of volunteers dedicated to free genealogy. Real Data and not just a bunch of links.



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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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Updated 4/26/2011
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