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- Knabl, Joseph
- Knapp, Albert
- Knapp, Georg Christian
- Knapp, Jacob
- Knapp, Ludwig Friedrich
- Knapp, Samuel Lorenzo
- Knaus, Ludwig
- Knebel, Karl Ludwig von
- Kneeland, Samuel
- Körner, Karl Theodor
- Krummacher, Friedrich Adolf
- Lachmann, Karl
- Lachner, Franz
- Ladrone Islands
- Lake, Gerard
- Lake, Henry Atwell
- Lake Dwellings
- Lake of the Woods
- Lalande, Joseph Jérôme Le Français de
- Lansing
- Lansingburgh
- Laramie (county)
- Laramie (city)
- Launitz
- Lawrence (Massachusetts)
- Lawrence (Kansas)
- Lawrence, Amos
- Lawrence, Henry Montgomery
- Lawrence, James
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- Lead
- Leathes, Stanley
- Leavenworth (county)
- Leavenworth (city)
- Leavitt, Joshua
- Lebanon (county)
- Lebanon (borough, village and towns)
- Lee, Ann
- Lee, Mrs. R. Bowdich
- Lee, Robert Edward
- Lee, Samuel
- Lee, Sophia
- Leech
- Leipsic
- Leisler, Jacob
- Leith
- Lewiston (Maine)
- Lewiston (New York)
- Lexington (county)
- Lexington (Massachusetts)
- Lexington (Virginia)
- Lexington (Kentucky)
- Lexington (Missouri)
- Library
- Lieber, Francis
- Lincoln (Nebraska)
- Lincoln, Abraham
- Linnæa
- Linnæus, Carl von
- Little Rock
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- Lokman
- Lola Montez
- Longfellow, Henry Wadsworth
- Long Island
- Long Island City
- Long Island Sound
- Lortzing, Albert Gustav
- Lory
- Los Angeles (county)
- Los Angeles (city)
- Louisburg
- Louis d'Or
- Louisiana
- Louisville
- Löwe, Sophie
- Lowell (city)
- Lowell (family)
- Luke, Saint
- Lully, Jean Baptiste
- Luna
- Luna, Pedro de
- Lunacy
- Lunalilo, William Charles
- Luzon
- McClintock, John
- Macready, William Charles
- Madison (Wisconsin)
- Madison (Indiana)
- Madison (post village)
- Madison, James
- Mädler, Johann Heinrich
- Mælar
- Maelstrom
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