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|  | Jackson, Donald Lester | R | CA | U.S. House | 1947 – 1961 |
| | Jackson, Henry Martin | D | WA | U.S. Senate | 1945 – 1983 |
| | Jackson, Jeff | D | NC | U.S. House | 2023 – 2025 |
| | Jackson, Jesse L., Jr. | D | IL | U.S. House | 1995 – 2012 |
| | Jackson, Jonathan L. | D | IL | U.S. House | 2023 – 2025 |
| | Jackson, Ronny | R | TX | U.S. House | 2021 – 2025 |
| | Jacobs, Andrew, Jr. | D | IN | U.S. House | 1965 – 1997 |
| | Jacobs, Andrew | D | IN | U.S. House | 1949 – 1952 |
| | Jacobs, Chris | R | NY | U.S. House | 2020 – 2023 |
| | Jacobs, Sara | D | CA | U.S. House | 2021 – 2025 |
| | James, Benjamin Franklin | R | PA | U.S. House | 1949 – 1959 |
| | James, Craig T. | R | FL | U.S. House | 1989 – 1993 |
| | James, John | R | MI | U.S. House | 2023 – 2025 |
| | Janklow, William | R | SD | U.S. House | 2003 – 2004 |
| | Jarman, John | R | OK | U.S. House | 1951 – 1977 |
| | Jarman, Peterson Bryant (Pete) | D | AL | U.S. House | 1945 – 1949 |
| | Javits, Jacob Koppel | R | NY | U.S. Senate | 1947 – 1981 |
| | Jayapal, Pramila | D | WA | U.S. House | 2017 – 2025 |
| | Jefferson, William J. | D | LA | U.S. House | 1991 – 2009 |
| | Jeffords, James M. | I | VT | U.S. Senate | 1975 – 2007 |
| | Jeffries, Hakeem | D | NY | U.S. House | 2013 – 2025 |
| | Jeffries, James Edmund | R | KS | U.S. House | 1979 – 1983 |
| | Jenison, Edward Halsey | R | IL | U.S. House | 1947 – 1953 |
| | Jenkins, Bill | R | TN | U.S. House | 1997 – 2007 |
| | Jenkins, Edgar Lanier | D | GA | U.S. House | 1977 – 1993 |
| | Jenkins, Evan | R | WV | U.S. House | 2015 – 2019 |
| | Jenkins, Lynn | R | KS | U.S. House | 2009 – 2019 |
| | Jenkins, Mitchell | R | PA | U.S. House | 1947 – 1949 |
| | Jenkins, Thomas Albert | R | OH | U.S. House | 1945 – 1959 |
| | Jenner, William Ezra | R | IN | U.S. Senate | 1947 – 1959 |
| | Jennings, Jonathan | R | TN | U.S. House | 1939 – 1952 |
| | Jennings, William Pat | D | VA | U.S. House | 1955 – 1967 |
| | Jenrette, John Wilson, Jr. | D | SC | U.S. House | 1975 – 1981 |
| | Jensen, Benton Franklin | R | IA | U.S. House | 1945 – 1965 |
| | Jepsen, Roger William | R | IA | U.S. Senate | 1979 – 1985 |
| | Jindal, Bobby | R | LA | U.S. House | 2005 – 2008 |
| | Joelson, Charles Samuel | D | NJ | U.S. House | 1961 – 1969 |
| | Johanns, Mike | R | NE | U.S. Senate | 2009 – 2015 |
| | Johansen, August Edgar | R | MI | U.S. House | 1955 – 1965 |
| | John, Chris | D | LA | U.S. House | 1997 – 2005 |
| | Johnson, Albert Walter | R | PA | U.S. House | 1963 – 1977 |
| | Johnson, Anton Joseph | R | IL | U.S. House | 1945 – 1949 |
| | Johnson, Bill | R | OH | U.S. House | 2011 – 2024 |
| | Johnson, Byron Lindberg | D | CO | U.S. House | 1959 – 1961 |
| | Johnson, Don | D | GA | U.S. House | 1993 – 1995 |
| | Johnson, Dusty | R | SD | U.S. House | 2019 – 2025 |
| | Johnson, Eddie | D | TX | U.S. House | 1993 – 2023 |
| | Johnson, Edwin Carl | D | CO | U.S. Senate | 1943 – 1955 |
| | Johnson, Glen Dale | D | OK | U.S. House | 1947 – 1949 |
| | Johnson, Hank | D | GA | U.S. House | 2007 – 2025 |
| | Johnson, Harold Terry | D | CA | U.S. House | 1959 – 1981 |
| | Johnson, Hiram Warren | R | CA | U.S. Senate | 1917 – 1945 |
| | Johnson, James Paul | R | CO | U.S. House | 1973 – 1981 |
| | Johnson, Jay W. | D | WI | U.S. House | 1997 – 1999 |
| | Johnson, Jed Joseph, Jr. | D | OK | U.S. House | 1965 – 1967 |
| | Johnson, Jed Joseph | D | OK | U.S. House | 1927 – 1947 |
| | Johnson, Justin Leroy | R | CA | U.S. House | 1945 – 1957 |
| | Johnson, Lester Roland | D | WI | U.S. House | 1954 – 1965 |
| | Johnson, Luther Alexander | D | TX | U.S. House | 1945 – 1946 |
| | Johnson, Lyndon Baines | D | | U.S. President | 1937 – 1969 |
| | Johnson, Mike | R | LA | U.S. House | 2017 – 2025 |
| | Johnson, Nancy L. | R | CT | U.S. House | 1983 – 2007 |
| | Johnson, Noble Jacob | R | IN | U.S. House | 1945 – 1949 |
| | Johnson, Ron | R | WI | U.S. Senate | 2011 – 2029 |
| | Johnson, Sam | R | TX | U.S. House | 1991 – 2019 |
| | Johnson, Thomas Francis | D | MD | U.S. House | 1959 – 1963 |
| | Johnson, Timothy V. | R | IL | U.S. House | 2001 – 2013 |
| | Johnston, Harry A., II | D | FL | U.S. House | 1989 – 1997 |
| | Johnston, John Bennett, Jr | D | LA | U.S. Senate | 1973 – 1997 |
| | Johnston, Olin DeWitt Talmadge | D | SC | U.S. Senate | 1945 – 1965 |
| | Johnston, Walter Eugene, III | R | NC | U.S. House | 1981 – 1983 |
| | Jolly, David | R | FL | U.S. House | 2014 – 2017 |
| | Jonas, Charles Raper | R | NC | U.S. House | 1953 – 1973 |
| | Jonas, Edgar Allan | R | IL | U.S. House | 1949 – 1955 |
| | Jones, Ben | D | GA | U.S. House | 1989 – 1993 |
| | Jones, Brenda | D | MI | U.S. House | 2018 – 2019 |
| | Jones, Doug | D | AL | U.S. Senate | 2018 – 2021 |
| | Jones, Ed | D | TN | U.S. House | 1969 – 1989 |
| | Jones, Hamilton Chamberlain | D | NC | U.S. House | 1947 – 1953 |
| | Jones, Homer Raymond | R | WA | U.S. House | 1947 – 1949 |
| | Jones, James Robert | D | OK | U.S. House | 1973 – 1987 |
| | Jones, Mondaire | D | NY | U.S. House | 2021 – 2023 |
| | Jones, Paul Caruthers | D | MO | U.S. House | 1948 – 1969 |
| | Jones, Robert Emmett, Jr. | D | AL | U.S. House | 1947 – 1977 |
| | Jones, Robert Franklin | R | OH | U.S. House | 1945 – 1947 |
| | Jones, Stephanie Tubbs | D | OH | U.S. House | 1999 – 2008 |
| | Jones, Walter B. | R | NC | U.S. House | 1995 – 2019 |
| | Jones, Walter Beaman, Sr. | D | NC | U.S. House | 1966 – 1993 |
| | Jones, Woodrow Wilson | D | NC | U.S. House | 1950 – 1957 |
| | Jonkman, Bartel John | R | MI | U.S. House | 1945 – 1949 |
| | Jontz, James Prather | D | IN | U.S. House | 1987 – 1993 |
| | Jordan, Barbara Charline | D | TX | U.S. House | 1973 – 1979 |
| | Jordan, Benjamin Everett | D | NC | U.S. Senate | 1958 – 1973 |
| | Jordan, Jim | R | OH | U.S. House | 2007 – 2025 |
| | Jordan, Leonard Beck | R | ID | U.S. Senate | 1962 – 1973 |
| | Joyce, David | R | OH | U.S. House | 2013 – 2025 |
| | Joyce, John | R | PA | U.S. House | 2019 – 2025 |
| | Judd, Walter Henry | R | MN | U.S. House | 1945 – 1963 |
| | Lee, Sheila Jackson | D | TX | U.S. House | 1995 – 2025 |