WISCONSIN SURNAMES: L
| SURNAME | COUNTY | RESEARCHER | WEBSITE |
| Laabs | Marathon, Milwaukee | Lowell and Sarah Froemming | |
| Labelle | Oshkosh, Langlade | Dale Miller Payne | |
| LaBerge | Rusk | Bob Heck | WEBSITE |
| LaBine | All | Jackie Behrmann | |
| Lacount | Manitowoc | Cheryl Ehlers | |
| Ladd | Bayfield | Cindy Andersen | |
| Ladd | Winnebago | Donna Bell Cross | |
| Laedtke | Shawano, Outagamie, Washington | Anne Taylor-Czaplewski | |
| Laedtke | Shawano | Victoria L. German | |
| Laeske/Leske | Milwaukee | Sally | WEBSITE |
| Lafler | Columbia, Wood | Lori A. Hanna | |
| LaFleur | Dunn, Barron | Gene Johnston | |
| LaFramboise | All | Dennis/Karen | |
| Lahm | Dodge, Jefferson | cmjacob@facstaff.wisc.edu | |
| La Londe | All | Martha A. Crosley Graham | |
| Lamb | Chippewa | Gene Johnston | |
| Lamb | Eau Claire, Dunn | Jocelyn Harvey | |
| Lamboi | Ozaukee | Paul Stamm | |
| Lambrecht/Lamprecht | Eau Claire | IverRoots@aol.com | |
| LaMoore | All | Gail E. Sparrow | |
| LaMotte | All | Dennis/Karen | |
| Lampe | LaFayette, Grant, Iowa | Sandra L. Everson | |
| Landgraf | Jefferson | Charles Smith | |
| Landsness | Dane | JRAM12@aol.com | |
| Landwehr | Brown | Darlene Wolff Harbick | |
| Lang | Portage, Wood | Rick Campen | |
| Lange | Portage, Wood | Rick Campen | |
| Lanners | Dodge, Fond du Lac | Dana Kellerman | |
| Lanphear | Adams, Rock | Terry Reisinger | |
| Lanzendorf | Columbia | Karolyn Roberts | WEBSITE |
| Laper | Fond du Lac, Green Lake | cmjacob@facstaff.wisc.edu | |
| Lapointe | Crawford | Phyllis Bonville | |
| Lapp | Sheboygan, Jackson | Laurie J. Kenville | WEBSITE |
| Lardinois | Door | Jeanne Reince Koller | |
| Largay | Winnebago | Kathy Lund | |
| Larkin | Washington | Patty Kaliher | |
| Larocque | All | Dennis/Karen | |
| Larrabee | Dunn, Dodge | Melissa Larrabee Titel | |
| Larsen | All | Steinar Best | WEBSITE |
| Larson | Dane | JRAM12@aol.com | |
| Larson | Dunn | Nancy Sabatke | |
| Larson | Dunn | Gene Johnston | |
| Larson | Green, Lafayette | Kelly Butler | |
| Larson | Kenosha | Peggy Larson | |
| Larson | LaCrosse | Etta Larson | |
| Larson | Shawano | Karolyn Roberts | WEBSITE |
| Larue | Monroe | norgni@gte.net | |
| Larzelere | Langlade | Jeanne Larzelere Bloom | |
| LaSart | Chippewa, Crawford | Karen Miller | |
| La Shay | Oconto, Fond du Lac, Brown | David La Shay Sr. | |
| Laske | Winnebago | Stacey Barton | |
| Laszewski | Portage | Betty Martz | |
| Lathers | Rock | Terry Reisinger | |
| Lathrop/Lothrop | Dodge | Charles C Young | |
| Latimer | Vernon | Joe Chase | |
| Lattin | Dodge, Green Lake | Linda Bischoff | |
| Lauby | Fond du Lac | Beverly J Oakley | |
| Lauer | Manitowoc, Brown, Milwaukee, Racine | dghaake@discover-net.net | |
| Lauersdorf | All | PpsychoSal@aol.com | |
| Lausted | Dunn | Clara Royer | |
| Lavelle | St. Croix | Molly Dean Woods | |
| Laverty | Iowa, others | Marcia Bastian | |
| Law | Brown | Victoria L. German | |
| Lawler/Lawlor | Winnebago, Fond du Lac, LaCrosse | Jeanne Downs Luebker | |
| Lazewski | Sheboygan, Winnebago | Ron Richter | |
| Lee | Eau Claire, Dunn | Jocelyn Harvey | |
| Leeman | Outagamie, Door | Nora Borts | |
| Legreid | Trempealeau | Laurie Nelson | WEBSITE |
| Leichtfuss, Lightfuss, Lightfoot | Waupaca | Debi | |
| Leigh/Lee | Racine | Don & Joan Johnson | |
| Leininger | Outagamie | Henriette Idestrup | WEBSITE |
| Leinwander | Outagamie, Wood | Lori Scheller | |
| Leisz | Barron | Kevin Wick | |
| Leland | Eau Claire | Vnvet95b@aol.com | |
| Lelo/Lello | Portage, Milwaukee | Shirley Patoka Allen | |
| LeMay | Oconto, Outagamie, Winnebago | Lynn Key | |
| Lemberger | Manitowoc | Ed Wenzel | |
| Lemke | Outagamie | Mel and Joan Frahm | |
| Lemont | Green Lake | Vicki Welsh-Genrich | |
| Lenke | Dunn | Clara Royer | |
| Lenneville | Manitowoc, Lafayette, Grant & Iowa | Rich Lenneville | |
| Lenneville | Manitowoc, Marathon, Iowa, Grant, Lafayette, LaCrosse | Bob Lenneville | |
| Lenssen | Outagamie, Winnebago | Janice Shaw | |
| Lepak/Lepack | All | Marlene Trader Molisee | |
| Lesselyong/Losselyong | Outagamie, Wood | Lori Scheller | |
| Leszczynski | Milwaukee | Tom Leszczynski | |
| Letsom | Kenosha, Racine | Stephen Peck | |
| Levi | St. Croix | Kathy | |
| Levisee | All | Bob Heck | WEBSITE |
| Lewandoske | Sheboygan | Ron Richter | |
| Lewis | Green | Catross@aol.com | |
| Lewis | Juneau | Marilyn Jones | |
| Lex | All | Donna Hance | |
| Lhost | Brown, Kewaunee | Joan Borman | |
| Liebel | Kewaunee | Ernest Liebel | |
| Liermann | Dodge | Beverly J Oakley | |
| Liesch | Outagamie, Winnebago | Janice Shaw | |
| Lieurance | Vernon, Lafayette, Iowa | Elissa Cramer | |
| Lillie | Marathon | Iris Lillie | |
| Limpert | LaCrosse | Roland Limpert | |
| Lincoln | Monroe | Bonnie Gilson | WEBSITE |
| Linden | Iowa | Wayne Kuebler | |
| Lindenthaler | Eau Claire, Dane | Laurie Nelson | WEBSITE |
| Lindig | Crawford, Grant | Phyllis Bonville | |
| Lindner | Jackson | Etta Larson | |
| Lindsay | Sheboygan | Kay R | |
| Lindstedt | Taylor, Clark | Beth Sternhagen | |
| Linsley | Jefferson | Iris Lillie | |
| Lipke | Dodge, Manitowoc, Washington | Margaret Robe Summitt | |
| Lisakowski | All | PpsychoSal@aol.com | |
| Lisiecki | Portage | Betty Martz | |
| Liska | All | PpsychoSal@aol.com | |
| Liska | Milwaukee | Sally | WEBSITE |
| Liska | Vernon, Bad Axe, Richland, Crawford | Nita Liska | |
| Little | Langlade, Oneida | Cindy Bergeron Scherwinski | |
| Lockwood | Adams | Loretta Craig | |
| Loechelt | Fond du Lac, Green Lake | cmjacob@facstaff.wisc.edu | |
| Loeffel | Marathon | Mary Haugland | |
| Lofy | Washington, Milwaukee | Mary | |
| Logue | Grant, Richland | Packrena@aol.com | |
| Lohf | Door, Brown, Kewaunee | SaunderaL@aol.com | |
| Lohmiller | Dodge, Fond du Lac, other | Patricia Bartelmey | |
| Lohrey | Waukesha, Kewaunee | Linda C Stephens Grass | |
| Lonski | All | PpsychoSal@aol.com | |
| Loomis | St. Croix | Kathy | |
| Looze | Wood, Kewaunee | Jeanne Reince Koller | |
| Lorbiecki | Portage | Betty Martz | |
| Lord | Eau Claire | MLSLIFER@aol.com | |
| Lord | Richland, Grant, Sauk | Ann Juette | |
| Lorge | Kewaunee | Jeanne Reince Koller | |
| Lorig | All | Dave Hinz | |
| Loritz | Door, Brown | SaunderaL@aol.com | |
| Lotharius | All | Marvin Dellinger | |
| Lott | Jackson, Iowa | Sharon Foree | |
| Lott | Chippewa, Eau Claire, Milwaukee | Stangern@aol.com | |
| Louden | Dodge | Jean | WEBSITE |
| Loughlin | Vernon | Joni | |
| Loughney | Sauk | Jocelyn Harvey | |
| Love | Chippewa | Dayton Love | |
| Lowe | Dunn | Sue Langus | |
| Lower | Racine, Winnebago, Vernon, & Monroe | Linda Lower | |
| Luber | Jefferson | Dana Kellerman | |
| Lucantelly | Rock | Darci | |
| Lukaszewski | All | Bonnie Haugen | |
| Lucht | Waupaca | Sandra Lucht | |
| Luckow | Outagamie, Milwaukee | Pat Oesterreich Gerbig | |
| Luebben | All | Howard Felkey | |
| Luffman | Calumet | Ron Richter | |
| Luffman | Fond du Lac | Ron Richter | |
| Lukowitz | All | PpsychoSal@aol.com | |
| Luksic | Milwaukee | Marcia Bastian | |
| Lumbar/Lombard/Lumbard/ Lumber/Lambert | All | Larry Friend | |
| Lunda | Ashland | Nancy | |
| Lunger | Pierce | bootz396@texomaonline.com | |
| Luther | Fond du Lac | Betty Martin | |
| Lyne | Lafayette | Paul Lyne |