| Name: | First Elected or Appointed: |
| Kadien, Thomas C., Jr. | November 6, 1934 |
| Kahn, Lawrence E. | November 6, 1979 |
| Kahn, Marcy L. | November 8, 1994 |
| Kalina, Abraham I. | November 3, 1970 |
| Kamins, Barry | November 6, 2012 |
| Kane, Anthony T. | November 7, 1995 |
| Kane, James L. | November 8, 1977 |
| Kane, James B., Jr. | November 4, 1975 |
| Kane, T. Paul | February 26, 1964 |
| Kapelman, William | November 4, 1969 |
| Kaplan, Deborah A. | November 8, 2011 |
| Kapnick, Barbara | November 6, 2001 |
| Kapper, Isaac M. | November 2, 1909 |
| Karalunas, Deborah H. | November 5, 2002 |
| Kartell, Irving P. | November 3, 1970 |
| Kasler, Theodore S. | November 5, 1974 |
| Kassal, Bentley | November 4, 1975 |
| Kassoff, Edwin | November 6, 1973 |
| Katz, Bertram | November 3, 1992 |
| Katz, Stanley B. | November 3, 1987 |
| Kavanagh, E. Michael | November 3, 1998 |
| Keane, Lyne Wessel | November 7, 2017 |
| Keegan, Thomas W. | November 5, 1991 |
| Kehoe, L. Paul | November 3, 1992 |
| Kelby, Charles H. | November 7, 1911 |
| Kellam, Leroy B. | November 2, 1982 |
| Kellogg, Abraham L. | November 6, 1917 |
| Kellogg, Henry T. | June 16, 1903 |
| Kellogg, John M. | November 3, 1903 |
| Kellogg, S. Alonzo | November 4, 1890 |
| Kelly, Harold P. | November 5, 1963 |
| Kelly, Paul J. | February 13, 1973 |
| Kelly, Peter Joseph | November 5, 2002 |
| Kelly, Shawn T. | November 5, 2019 |
| Kelly, Theodore A. | November 6, 1973 |
| Kelly, William A. | November 8, 2005 |
| Kelly, William J. | November 3, 1903 |
| Kenefick, Daniel J. | November 7, 1899 |
| Keniry, William H. | November 5, 1985 |
| Kennedy, George N. | November 5, 1878 |
| Kennedy, Robert P. | May 2, 1973 |
| Kennedy, Tanya R. | November 3, 2015 |
| Kent, Dorothy E. | November 4, 1975 |
| Kent, James | February 6, 1798 |
| Kent, William J., III | November 2, 1999 |
| Kenyon, Benn | November 4, 1930 |
| Keogh, J. Vincent | November 7, 1950 |
| Keogh, Martin J. | November 5, 1895 |
| Kern, Cynthia S. | November 2, 2010 |
| Kern, Michael | November 5, 1968 |
| Kerrigan, Kevin | November 7, 2006 |
| Kerrigan, Kevin J. | November 3, 2020 |
| Kevins, Linda J. | November 7, 2017 |
| Kiley, Michael H. | November 5, 1912 |
| Kimball, Henry J. | November 8, 1938 |
| King, Gilbert H. | November 6, 1962 |
| King, Kathy | November 4, 2014 |
| Kings, James G., Jr. | January 14, 1851 |
| Kingsley, Jesse E. | November 2, 1937 |
| Kingston, John E. | November 8, 1994 |
| Kirschenbaum, Irving | February 8, 1972 |
| Kitzes, Orin R. | November 8, 1994 |
| Klein, Aaron E. | November 2, 1976 |
| Klein, Arthur G. | November 6, 1956 |
| Kleinfeld, Philip M. | January 13, 1941 |
| Knapp, Clyde W. | November 6, 1928 |
| Knipel, Lawrence S. | November 4, 1997 |
| Knobel, Gary F. | November 3, 2020 |
| Knopf, Stephen A. | November 8, 2005 |
| Knopf, Stephen A. | November 5, 2019 |
| Knowles, Raymond A. | November 4, 1947 |
| Knox, Addison T. | November 8, 1859 |
| Koch, Edward R. | April 10, 1933 |
| Kohm, Robert C. | November 3, 1992 |
| Kohn, Gabriel S. | November 4, 1997 |
| Kooper, Sybil Hart | November 4, 1975 |
| Koota, Aaron E. | November 5, 1968 |
| Koreman, Harold E. | November 5, 1963 |
| Korn, Hyman | September 1, 1962 |
| Kornreich, Shirley Werner | November 4, 2008 |
| Koshian, Jacqueline M. | November 4, 1986 |
| Kotler, Lynn R. | November 6, 2018 |
| Kramer, Alfred M. | November 5, 1957 |
| Kramer, Barry D. | November 3, 2009 |
| Kramer, Herbert | November 7, 1989 |
| Krausman, Gabriel M. | November 2, 1982 |
| Kreindler, Robert S. | March 5, 1997 |
| Krogmann, David B. | November 4, 2003 |
| Kronenberg, Frank J. | November 6, 1962 |
| Kruse, Frederick W. | December 31, 1899 |
| Kuffner, Charles A., Jr. | November 2, 1982 |
| Kuhnen, Richard F. | November 7, 1972 |
| Kunzeman, Joseph J. | November 2, 1971 |
| Kupferman, Theodore R. | November 4, 1969 |
| Kurtz, Donald Scott | November 8, 2005 |
| Kurtz, Donald Scott | November 5, 2019 |
| Kusnetz, David | November 8, 1955 |
| Kuszynski, Joseph P. | November 2, 1965 |
| Kutner, Harry H. | November 2, 1982 |