- (AU) Liddall
 - History of the Liddall, Tomlinson, Ackerley, Boden and Pyke families from their beginnings to life in Tasmania and beyond. - La Liberte
- Labadie
- Information about the settlement of Detroit and the Labadie family in the 18th century.
- Lacy
- 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.
- Landers (1)
- Landwer / Rieke
- Includes Aurand, Brommelkamp, Elfrink, Wilmer, Lageschulte, Schaefer, Homuth, Hobein, and more.
- Langford
- Genealogy for people who lived in and around Bandera, TX.
- Lantz
- History and genealogy of the Amish branch of this surname.
- 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 (3)
- Leedy / Lidi
- LeFevres
- History and genealogy of the descendants of Huguenot Isaac LeFevre of 1669.
- Legg
- Genealogy page with family surnames: Legg, Myers, Smith, Lewis, Townsend, Maynes, Wilkie, plus many more.
- Leibenguth / Livengood
- Includes vital stats, wills, photos, etc.
- Lenhart
- History of the family.
- Leong
- Family tree.
- Lewing
- Pictures of the Lewing family and a short history on the beginning. Read at your own risk.
- Lewis (2)
- Leys
- Descendants of Joseph Leys (1876-1963) of Scotland as well as information on the following surnames: Lang, Tinsley, Hudson, Wood, Cunningham, and Demeter.
- 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.
- Lillard
- From France in 1600's to Virginia to Georgia, and Texas.
- Limaverde
- Brazilian family genealogy; (in Portuguese).
- Limjoco
- Family history.
- Lincoln (1)
- Lindsay (2)
- Lingrosso
- Descendant info for Lingross, Elgin, Morgan, Norton, & Flowers families, including documentation and sources.
- Linnells
- Contains resources relating to the family descended from English landscape painter John Linnell.
- Liston
- Littlefield (1)
- 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 (3)
- Lokker
- Includes historical documents, photographs, and related families.
- Longwell
- An attempt to record all Longwell, Longwill, Langwell, and related families.
- Loop
- Other surnames include Hooker, Cook, Palmeter, Frey, Frost, McGrew, and others.
- 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.
- Lovering / Lovrien
- Genweb database with info on over 2,000 people. Also includes associated families Bartels, Benedict, Haskins, Gregory, Hoyt, Lockwood, Rhine, Shelgren, and Yount.
- 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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