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Contra Costa County California Genealogy Trails

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Welcome to Contra Costa County, California Genealogy Trails!



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County Seat: Martinez
Year Organized: 1850
Square Miles: 802.15

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.

Birdseye View of Pittsburg, CA

circa about 1921




TOWNS

Antioch * Lafayette * Pleasant Hill * Brentwood * Martinez * Richmond * Clayton
Moraga
* San Pablo * Concord * Oakley * San Ramon * Danville * Orinda * Walnut Creek
El Cerrito * Pinole * Hercules * Pittsburg

NEIGHBORING COUNTIES

Alameda County, CA - Marin County, CA - Solano County, CA

Sacramento County, CA - San Joaquin County, CA - San Francisco County, CA

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