• Various Birth, Marriage, Death and Obituary databases for California that include San Mateo County
• San Mateo County Birth Records—FREE (by San Mateo County Genealogical Society)
• San Mateo County Death Records—FREE (by San Mateo County Genealogical Society)
• San Mateo County Marriages, 1853-1965—FREE (by San Mateo County Genealogical Society)

• Biographies—FREE (by Golden Nugget Library)
• San Mateo County Biographies—FREE (USGenWeb Archives)

• 1908-09 Attorneys and Bankers Directory—FREE (by Golden Nugget Library)

• 1860 Federal Census Transcription—FREE
• includes Belmont, Redwood City, Searsville, Woodside.
• 1870 Federal Census Transcription—FREE
• includes Belmont, Half Moon Bay, Menlo Park, Pescadero, Redwood City, San Mateo, School House Station, Searsville.
• U.S. Census Records (1860-1930)—FREE & $$$$

County-Wide
1918 San Mateo County Chapter American Red Cross Membership—FREE

Half Moon Bay
1882 Fremasons, Hayward Lodge—FREE

Menlo Park
Menlo Country Club, Officers & Members, 1924—FREE

Pescadero
1882 Freemasons, Pescadero Lodge—FREE

Redwood City
1882 Freemasons, San Mateo Lodge—FREE
Native Sons of the Golden West, Redwood Parlor No. 66, Officers & Members, 1935—FREE

San Mateo
Beresford Country Club (San Mateo), Officers and Members, 1924—FREE
 

• 1878 Patron's Directory from Moore & De Pue's Illustrated History of San Mateo County, California—FREE
• McKenney's Pacific Coast 1880-81 Directory - San Mateo County (Business Directory)—FREE (by Golden Nugget Library)
• 1889-1928 San Mateo County Officials from the California Blue Book/State Roster—FREE (by Golden Nugget Library)
• 1889 San Francisco Blue Book—FREE
• Includes Menlo Park, Redwood City and San Mateo.
• San Mateo County Social Directory, 1892—FREE
• Includes Menlo Park, Redwood City and San Mateo.
• Pacific Telephone and Telegraph Co., 1898 (March) (images)—FREE (by Golden Nugget Library)
• Includes locations in San Mateo County.
• 1911/12 City Directory (by San Mateo County CAGenWeb)—FREE
• Includes Belmont, Fair Oaks, Menlo Park, Redwood City and San Carlos.
• 1916 Telephone Directory (images)—FREE (by Golden Nugget Library)
• San Francisco Blue Book and Club Directory, 1924—FREE
• Includes Atherton, Burlingame, Hillsborough, Menlo Park, and San Mateo.
• San Francisco Social Register, 1927—FREE (by Golden Nugget Library)
• Includes San Mateo County listings.
• 1928 New Society Blue Book (images)—FREE (by InternetArchive.com)
• Includes Hillsborough, Burlingame, San Mateo, Redwood, Woodside, Atherton, and Menlo Park.
• 1940 Telephone Directory (images)—FREE (by Golden Nugget Library)
• 1941/42 Redwood City Directory (images)—FREE (by Golden Nugget Library)
• Includes Atherton, Belmont, Emerald Lake, Menlo Park, San Carlos, White Oaks and Woodside
• 1948 San Mateo County Telephone Directory (images)—FREE (by InternetArchive.com)
• 1948 San Mateo County Telephone Directory (images and searchable)—FREE (by Evendon.com)
• San Mateo County Telephone Book, 1973, 1977 (images)—$$$$ (for a fee by ancestry.com)
• Except Brisbane, Colma and Part of Daly City.

Belmont
Belmont Social Directory, 1899—FREE (by Golden Nugget Library)
see also San Mateo County Directories

Brisbane
1940-1941 Brisbane Telephone Directory—FREE
1940-1941 Brisbane Directory of Advertisers—FREE
see also San Mateo County Directories

Burlingame
Burlingame Country Club Former Officers, 1893 - 1981—FREE
Burlingame Social Directory, 1899—FREE (by Golden Nugget Library)
Burlingame Blue Book Directory, 1905—FREE
Burlingame Club Officers & Members, 1905—FREE
Burlingame City Directory, 1907—FREE
Burlingame Residents, 1921/1922 New Society Blue Book—FREE
Burlingame Blue Book Directory, 1924—FREE
Burlingame Country Club, Officers & Members 1924—FREE
Burlingame Blue Book, 1925—FREE (by Golden Nugget Library)
Burlingame City Directory 1925—FREE
Burlingame City Directory 1927 (images)—FREE (by Golden Nugget Library)
Burlingame City Directory 1929 (images)—FREE (by Golden Nugget Library)
Burlingame City Directory, 1930 (images)—FREE
1936 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1939 through 1948 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1940 Burlingame City Directory (images)—FREE (by Golden Nugget Library)
1942 Burlingame City Directory (images)—FREE (by Golden Nugget Library)
Burlingame City Directory, 1945—FREE (by Golden Nugget Library)
1949/1950 Burlingame City Directory—FREE (by Golden Nugget Library)
see also San Mateo County Directories

Colma
see also San Mateo County Directories

Daly City
see also San Mateo County Directories

East Palo Alto
East Palo Alto Telephone Directory, 1951—FREE (byGolden Nugget Library)
see also San Mateo County Directories

Foster City
see also San Mateo County Directories

Half Moon Bay
see also San Mateo County Directories

Homestead
Homestead Directory, 1907—FREE
see also San Mateo County Directories

Hillsborough
Hillsborough Residents, 1921/1922 New Society Blue Book—FREE
Hillsborough Blue Book Directory, 1924—FREE
Hillsborough Blue Book, 1925—FREE (by Golden Nugget Library)
Hillsborough City Directory 1927 (images)—FREE (by Golden Nugget Library)
Hillsborough City Directory 1929 (images)—FREE (by Golden Nugget Library)
1930 Hillsborough City Directory (images)—FREE
1936 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1939 through 1948 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1940 Hillsborough City Directory (images)—FREE (by Golden Nugget Library)
1942 Hillsborough City Directory (images)—FREE (by Golden Nugget Library)
Hillsborough City Directory, 1945—FREE (by Golden Nugget Library)
1949/1950 Hillsborough City Directory—FREE (by Golden Nugget Library)
see also San Mateo County Directories

Menlo Park
Menlo Park Social Directory, 1892—FREE
Menlo Park Social Directory, 1899—FREE (by Golden Nugget Library)
Menlo Park Blue Book Directory, 1905—FREE
Menlo Park Residents, 1921/1922 New Society Blue Book—FREE
Menlo Park Blue Book Directory, 1924—FREE
Menlo Park Blue Book, 1925—FREE (by Golden Nugget Library)
Polk's Menlo Park Directory, 1926 (text)—FREE
Polk's Menlo Park Directory, 1926 (images)—FREE
1939, 1940 Menlo Park City Directory—$$$$ (Ancestry.com)
Menlo Park Telephone Directory, 1951—FREE (by Golden Nugget Library)
see also San Mateo County Directories

Millbrae
1942 Millbrae City Directory (images)—FREE (by Golden Nugget Library)
Millbrae Directory, 1945—FREE (by Golden Nugget Library)
1949/1950 Millbrae City Directory—FREE (by Golden Nugget Library)
see also San Mateo County Directories

Pacifica
see also San Mateo County Directories

Pescadero
see also San Mateo County Directories

Portola Valley
see also San Mateo County Directories

Redwood City
Redwood City Social Directory, 1892—FREE
Redwood City Social Directory, 1899—FREE (by Golden Nugget Library)
Redwood City Blue Book Directory, 1905—FREE
Redwood City Directory, 1907—FREE
Redwood City Residents, 1921/1922 New Society Blue Book—FREE
Redwood City Blue Book Directory, 1924—FREE
Redwood City Blue Book, 1925—FREE (by Golden Nugget Library)
1937, 1939, 1941-42 Redwood City Directory—$$$$ (Ancestry.com)
Redwood City Directory, 1941-42—FREE (by Golden Nugget Library)
see also San Mateo County Directories

San Bruno
1929/30 San Bruno City Directory (searchable database--not browsable)—FREE (by rootsweb)
see also San Mateo County Directories

San Carlos
San Carlos Social Directory, 1899—FREE(by Golden Nugget Library)
see also San Mateo County Directories

San Mateo
San Mateo Social Directory, 1892—FREE
San Mateo Social Directory, 1899—FREE (by Golden Nugget Library)
San Mateo Blue Book Directory, 1905—FREE
San Mateo Society Blue Book, 1921/22—FREE
San Mateo Blue Book Directory, 1922—FREE
San Mateo City Directory 1925—FREE
San Mateo Blue Book, 1925—FREE (by Golden Nugget Library)
San Mateo City Directory 1927 (images)—FREE (by Golden Nugget Library)
San Mateo City Directory 1929 (images)—FREE (by Golden Nugget Library)
1930 San Mateo City Directory (images)—FREE
1936 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1939 through 1948 Burlingame, Hillsborough, San Mateo City Directory—$$$$ (Ancestry.com)
1940 San Mateo City Directory (images)—FREE (by Golden Nugget Library)
1942 San Mateo City Directory (images)—FREE (by Golden Nugget Library)
San Mateo Directory, 1945—FREE (by Golden Nugget Library)
1949/1950 San Mateo City Directory—FREE (by Golden Nugget Library)
see also San Mateo County Directories

South San Francisco
see also San Mateo County Directories

Woodside
Woodside Residents, 1921/1922 New Society Blue Book—FREE
Woodside Blue Book Directory, 1924—FREE
Woodside Blue Book, 1925—FREE (by Golden Nugget Library)
see also San Mateo County Directories

• Layng & Tinney Mortuary Index—FREE & $$$$ (by San Mateo County Genealogical Society)

• San Mateo County Poorfarm & Hospital—FREE
• San Mateo County & Township Officers (CA State Government), 1870—FREE (by Peggy B. Perazzo)
• San Mateo County Coroner's Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Professional Ledgers Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Sheriff's Office Booking Registers—FREE (by San Mateo County Genealogical Society)
• Index for Volumes 7 and 8 covering the years 1924 to 1931

• San Mateo County Deeds Index—FREE (by San Mateo County Genealogical Society | Mary Lou Grunigen)
• San Mateo County Mortgage Books 1 & 2 Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Patent Book One Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Patent Books (One to Three) Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Miscellaneous Land Records Index—FREE (by San Mateo County Genealogical Society)
• San Mateo County Deed Book 4 Index—FREE (by San Mateo County Genealogical Society)
• BLM Land Patent Records List (for San Mateo County)—FREE

World War II Honor List of Dead and Missing (1946)—FREE

• 1930 California Academy of Medicine Members—FREE
• Notaries Public—lists of SM Notaries Public from California Blue Books, various years 1886-1909—FREE (by Golden Nugget Library)
• Clipping File Name and Subject Index—miscellaneous index of clippings—FREE & $$$$ (by San Mateo County Genealogical Society)
• Schellens Collection Index—miscellaneous index of research names, places and subjects—FREE & $$$$ (by San Mateo County Genealogical Society)

Daly City
Signers to the Petition for the Incorporation of Daly City, 1910—FREE

Millbrae
Millbrae Highlands Brochure circa 1939—FREE
Millbrae American Legion Officers 1958—FREE

• Camp Fremont Naturalization Index, 1918-1919 (PDF)
• Hosted by permission of the San Mateo County Genealogical Society.
• San Mateo County Naturalization Index To Sept 25, 1906 (PDF)
• Hosted by permission of the San Mateo County Genealogical Society.
• San Mateo County Naturalization Index, 1907-1925 (PDF)
• Hosted by permission of the San Mateo County Genealogical Society.
• San Mateo County Naturalization Index, 1926-1945 (PDF)
• Hosted by permission of the San Mateo County Genealogical Society.
• San Mateo County Naturalization Index, 1946-1983 (PDF)
• Hosted by permission of the San Mateo County Genealogical Society.

• San Mateo County Gazette—transcriptions from 1859—FREE (by Chris Havnar)
• San Mateo County Obituary Index—FREE & $$$$ (by San Mateo County Genealogical Society)
• San Mateo Times Gazette Index—FREE (by San Mateo County Genealogical Society | Mary Lou Grunigen)
• Newspaper Abstracts Project —FREE
• An all-volunteer project with a searchable collection of newspaper abstracts and extracts from pre-1930 newspapers all over the U.S.
• Obit Central—FREE
• Notices from the Alamanac News from 1998 to current
• Obituary Daily Times—FREE
• Includes current notices from San Mateo Timesand Pacifica Tribune
• San Mateo Times from 1925 to 1978
• Images and text search—$$$$ (for a fee by NewspaperArchive.com)

• Vitalsearch-San Mateo County-1933—FREE

• 1873 San Mateo County Great Register (images)—FREE
• 1888 San Mateo County Great Register (images)—FREE
• includes Belmont, Colma, La Honda, Laguna, Menlo Park, Pescadero, Redwood City, San Bruno, San Gregorio, Searsville, Spanishtown, Woodside.
• 1890 San Bruno Great Register of Voters—FREE
• 1890 Searsville Great Register of Voters—FREE
• 1908 San Bruno Precinct Register—FREE
• California Voter Registrations (San Mateo County)—$$$$ (Ancestry.com)
• 1900-1944 (most years)

• U.S. IRS Tax Assessment Lists, 1863-1866—$$$$ (Ancestry.com)
 San Francisco, San Mateo Monthly, Annual and Special Lists