| Surname | Township |
| Lacewell | Union |
| Lache? | Ward 3 |
| Lackner | Ward 1 |
| Lacy | Mainshore, Ward 3 |
| Laden | Clarke |
| Lake | Union |
| Lakey | Shady Grove |
| Lamanquitz | Jones |
| Lamb | Bryan, Cache, Clarke, Lake, Mainshore, Salem |
| Lamb | Shady Grove, Union, Ward 2, Ward 3 |
| Lambert | Clarke, St. Francis |
| Lamberth | Ward 3 |
| Lancaster | Mainshore, St. Francis, Union, Ward 3 |
| Land | Clarke |
| Landerman | Ward 2 |
| Landfair | St. Francis |
| Landrum | Clarke, Hurricane, Spring Grove, Ward 2 |
| Lands | Cache |
| Lane | St. Francis, Union, Ward 2 |
| Lang | Bryan, Ward 3 |
| Langdon | Hurricane |
| Langley | Lake, St. Francis |
| Langly | Ward 3 |
| Langston | Ward 2 |
| Langton | Poland |
| Lanie | Mainshore |
| Larkin | Union |
| Lashley | Clarke |
| Lasley | Lake |
| Laswell | Ward 2, Ward 3 |
| Lauchstaedt | Union |
| Laughlin | Spring Grove |
| Lavall | Jones |
| Lawless | Clarke |
| Lawrence | Mainshore, Union, Ward 2, Ward 3 |
| Lawson | Ward 2 |
| Lax ? | Friendship |
| Layman | Union |
| Layton | Poland, Ward 1 |
| Lear | Mainshore |
| Leatherman | Mainshore |
| Leaverman | Mainshore |
| Leddell | Ward 3 |
| Lee | Shady Grove, Ward 1, Ward 3 |
| Leeper | Jones |
| Leggett | Hurricane |
| Lelaman ? | Mainshore |
| Leland | Clarke |
| Lemarr | Jones |
| Lemmons | Poland |
| Lenderman | Cache, Poland |
| Lentz | Union |
| Lephart? | Lake |
| Lepold | Hurricane |
| Leroy | Hurricane |
| LeRoy | Union |
| Lester | Friendship, Hurricane |
| Letbetter | Hurricane, Union |
| Letherman | Mainshore |
| Letner | Hurricane |
| Levins | Poland |
| Lewis | Clarke, Hurricane, Lake, Union Ward 1, Ward 2, Ward 3 |
| Liddell | Bryan, Friendship, Hurricane |
| Liffer | Jones |
| Light | Bryan, Cache, Ward 2 |
| Ligon | Ward 2 |
| Like | Crowley, Hurricane |
| Linch | Friendship |
| Linder | Ward 1 |
| Lindsey | Ward 3 |
| Lineberger | Ward 1 |
| Linn | Shady Grove |
| Linsey | Hurricane |
| Lintnell | Ward 2 |
| Linzie | Ward 2 |
| Little | Clarke, Poland, Salem, Spring Grove |
| Litton | Union |
| Livengood | Ward 2 |
| Livesay | Union |
| Livesy | Lake |
| Lloyd | St. Francis, Ward 1 |
| Lockhart | Jones, Union |
| Lockyear | Ward 2 |
| Loefer | Bryan |
| Logan | Ward 3 |
| Lomire | Union |
| Lone | Lake |
| Long | Hurricane, Ward 1 |
| Loomas | Ward 1 |
| Looney | Union |
| Loretz | Ward 1 |
| Lottie | Poland |
| Lovelace | Ward 1 |
| Lovelady | Union |
| Lovie? | Lake |
| Lowe | Salem, Ward 1 |
| Lowery | Spring Grove, St. Francis |
| Loyd | Crowley |
| Lumpkin | Jones |
| Lumpkins | Clarke |
| Luna | Ward 2 |
| L---Y? | Salem |
| Lynch | Lake |
| Lytle | Ward 1, Ward 2, Ward 3 |
| Lyttle | Ward 2 |
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