- La Liberte
 - Laefer / Blattstein
- Family photographs and genealogy.
- Laing
- Lamkin / Lampkin
- Genealogical data for this surname and its variations.
- Lamont (4)
- Lampert
- A site dedicated to the descendants of Jacob Lampert who immigrated from Switzerland in 1846.
- Land, Weis, Wing, Merck, Ashford, Appleby, and more families
- Information relevant to Pensacola and panhandle history, including the mahogany boom of the 1900s.
- Landwer / Rieke
- Includes Aurand, Brommelkamp, Elfrink, Wilmer, Lageschulte, Schaefer, Homuth, Hobein, and more.
- Langford
- Genealogy for people who lived in and around Bandera, TX.
- Lathan
- Tracing the descendants of Robert Leathan, who immigrated to the U.S. from County Antrim, Northern Ireland in 1788. Features biographical data, photos, and more.
- Lauricella / Dornbirer
- Family history and genealogy.
- Laverty
- Dedicated to the preservation of the good Laverty name and the promotion of the ideals of the Laverty clan.
 Lawrence / Hicks / Mitchell / Dicker
- Lawson (1)
- Lebouc
- List of people whose family name is Lebouc or homonym.
- Ledwell
- Submit and find information on the Ledwell family name.
- Lee (2)
- Leedy / Lidi
- LeFevres
- History and genealogy of the descendants of Huguenot Isaac LeFevre of 1669.
 Leitrim-Roscommon Genealogy
- Specific to the Counties of Leitrim and Roscommon, providing a means for checking for surnames that are being researched in these two counties.- Lenhart
- History of the family.
- Lewis (2)
- Liddall
- History of the Liddall, Tomlinson, Ackerley, Boden and Pyke families from their beginnings to life in Tasmania and beyond.
- Liddle
- Tracing of the Liddles in America. List of Liddles looking for other Liddles.
- Lidstone
- Includes family tree, membership information, reunion details, and more.
- Liedtke
- Also includes descendant charts and information on the Meyers, Chatterton, and Waddoups families.
- Limjoco
- Family history.
- Lindsay (1)
- Linnells
- Contains resources relating to the family descended from English landscape painter John Linnell.
- Liston
- Lloyd
- Family tree of those descended from Hugh Lloyd of Baynham Hall. Includes maps, pictures, and links as well as information on individual family members.
- Locke (2)
- Lokker
- Includes historical documents, photographs, and related families.
- Lord
- Loughlin
- Compilation of genealogy research for names surnames including: Seller, Cudding, Mischka, Johnson, Carroll, McKinley, Schmitt, Corrigan and others.
- Lovelace / Loveless
- Access documentation for all known family of these surnames.
- Lowery
- Includes some of the following surnames: Lowery, Eye, Turner, Gray, Lash, Lisenbee, and more.
- Lozon
- Includes Lauzon, Lozen, and Lozo. Originally from Normandy.
- Luddington / Ludington
- Genealogy and family history page, including GenConnect surname boards and mailing list.
- Lücker
- Lugaila
- Lumpp
- Documenting the Lumpp and Manning families.
- Lynskey
- Includes family tree, photographs, and events.
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