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I, Donna K. Clark, your AncestorSpy guide, will walk you through discovering the fascinating stories of your ancestors. As this site is upgraded you will find hints and step by step instructions to help you organize and discover great ancestral stories to share with your loved ones. Check the AncestorSpy How To Manual often for new articles and updates.
I love this free family tree because it helps me find my ancestors. I believe you will enjoy it too.
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Contra Costa County, California Genealogy
 Contra Costa County was created Feb. 18, 1850 as an original county.
Census - search by NAME Census - search each PAGE
1860 U.S. Census - online at Ancestry.com 1860 U.S. Census for Contra Costa County, California - online at Ancestry.com
1870 U.S. Census - online at Ancestry.com 1870 U.S. Census for Contra Costa County, California - online at Ancestry.com
1880 U. S. Census - online at Ancestry.com 1880 U.S. Census for Contra Costa County, California - online at Ancestry.com
1900 U.S. Census - online at Ancestry.com 1900 U.S. Census for Contra Costa County, California - online at Ancestry.com
1910 U.S. Census - online at Ancestry.com 1910 U.S. Census for Contra Costa County, California - online at Ancestry.com
1920 U.S. Census - online at Ancestry.com 1920 U.S. Census for Contra Costa County, California - online at Ancestry.com
1930 U.S. Census - online at Ancestry.com 1930 U.S. Census for Contra Costa County, California - online at Ancestry.com
History
pub. 1917 The History of Contra Costa County, California - online
pub. 1940 History of Contra Costa County - online
pub. 1974 History of Contra Costa County, California - online
Map
1895 Contra Costa County Map - free online

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