List of former members of the United States House of Representatives (K) Number of years/terms representative/delegate has served Number of years/terms representative/delegate has served

| Representative | Years | State_ | Party | Lifespan_ |
|---|---|---|---|---|
| Frank Le Blond Kloeb | 1933–1937 | Ohio | Democratic | 1890–1976 |
| Robert Klotz | 1879–1883 | Pennsylvania | Democratic | 1819–1895 |
| John C. Kluczynski | 1951–1975 | Illinois | Democratic | 1896–1975 |
| Scott L. Klug | 1991–1999 | Wisconsin | Republican | 1953– |
| Theodore F. Kluttz | 1899–1905 | North Carolina | Democratic | 1848–1918 |
| Anthony L. Knapp | 1861–1865 | Illinois | Democratic | 1828–1881 |
| Charles Knapp | 1869–1871 | New York | Republican | 1797–1880 |
| Charles J. Knapp | 1889–1891 | New York | Republican | 1845–1916 |
| Charles L. Knapp | 1901–1911 | New York | Republican | 1847–1929 |
| Chauncey L. Knapp | 1855–1857 | Massachusetts | American | 1809–1898 |
| Chauncey L. Knapp | 1857–1859 | Massachusetts | Republican | 1809–1898 |
| Robert M. Knapp | 1873–1875 , 1877–1879 | Illinois | Democratic | 1831–1889 |
| Herman Knickerbocker | 1809–1811 | New York | Federalist | 1779–1855 |
| Frank C. Kniffin | 1931–1939 | Ohio | Democratic | 1894–1968 |