- 1 Lonergan Building
- 3 Long Beach, California
- 3 Long Island, New York
- 1 Long Lane Inn
- 1 Long, Huey Pierce, Jr., 1893–1935
- 7 Longcase clocks
- 5 Longfellow, Henry Wadsworth, 1807-1882
- 1 Longinus, 1st cent.
- 2 Longman, Thomas, 1804-1879
- 5 Longshore Street
- 12 Longshoremen
- 1 Longstreet, James, 1821-1904
- 1 Lonsdale, Thomas Preston (1855-1900), Architect
- 2 Looms
- 4 Looney, Robert F.
- 1 Loose-leaf bindings
- 1 Lopez & Vaquez
- 1 Lord Aukland
- 1 Lord Leiscester's Hospital
- 1 Lord Mayor's Day
- 1 Lorenz Bros.
- 3 Loretto Avenue
- 1 Lorimer, John H.
- 2 Lorimer, William H. & Sons (Dyers)
- 1 Los Altos, California
- 1 Los Angeles County, California
- 15 Los Angeles, California
- 1 Los Salas, Mexico
- 8 Lots (land)
- 4 Louchheim, Stuart F. (Stuart Fleisher), 1892-1971
- 1 Loudon, J.C. (John Claudius)
- 1 Loudoun Park
- 1 Louis IX, King of France, 1214-1270
- 8 Louis Leon Marchand (Firm)
- 1 Louis Philippe, King of the French, 1773-1850
- 1 Louis Reigdoll Rig Co. Lager Beer (Firm)
- 1 Louis, Saint, Bishop of Toulouse, 1274-1297
- 28 Louisiana
- 2 Louisville Steam Lith. Co.
- 2 Louisville, Kentucky
