- Jerde, E.A.2
- Johnson and Ward2
- Judd, Philu E.2
- Justus Perthes (Firm : Gotha, Germany)2
- Kanamaru, Hikogorō2
- Kane, Elisha Kent, 1820-18572
- Kashihara, Yoshinaga2
- Keefer, Thomas C., 1821-19152
- Kelley, John A., C.E., cartographer.2
- Kelly, B. W. (Soil surveyor)2
- Kents Restaurant2
- Kentucky Geological Survey2
- Krause, Frank (Civil engineer)2
- L.J. Richards & Co.2
- La Caille, Nicolas Louis de, 1713-17622
- La Pérouse, Jean-François de Galaup, comte de, 1741-17882
- Lane, Alfred C. (Alfred Church), 1863-19482
- Langwith Publishing Company (Minneapolis, Minn.)2
- Lapie, M. (Pierre), 1779-18502
- Laurie, Richard Holmes2