The Contra Costa County History Center is operated by the County Historical Society. We welcome e-mail queries on your ancestors who may have lived in our county. We operate a primary source archive. Our holdings include our most recent acquisition, all of the Naturalization records from our Superior Court. This includes thousands of names of those who were naturalized while living in Contra Costa between 1850 and 1978. After 1893 the records are incredibly detailed. We will look up your ancestor at no cost and reproduce all of the pertinent pages for a small fee. For more about our holdings please visit our web site:
cocohistory.com or send e-mail to: cchistry@ix.netcom.com