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FamilySearch Wiki - San_Mateo County, California.

Free online genealogical research guide for San_Mateo County, California.

Genealogy Inc. - San Mateo County, California Facts, Genealogy, Records & Links

Linkpendium - San Mateo County, California

NACo (National Association of Counties) - County Explorer

San Mateo County, California (USGenWeb)

USGenWeb Archives