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|  | Aandahl, Fred George | R | ND | U.S. House | 1951 – 1953 |
| | Abbitt, Watkins Moorman | D | VA | U.S. House | 1948 – 1973 |
| | Abdnor, James | R | SD | U.S. Senate | 1973 – 1987 |
| | Abel, Hazel Hempel | R | NE | U.S. Senate | 1954 – 1954 |
| | Abele, Homer E. | R | OH | U.S. House | 1963 – 1965 |
| | Abercrombie, Neil | D | HI | U.S. House | 1986 – 2010 |
| | Abernethy, Thomas Gerstle | D | MS | U.S. House | 1945 – 1973 |
| | Abourezk, James George | D | SD | U.S. Senate | 1971 – 1983 |
| | Abraham, Ralph | R | LA | U.S. House | 2015 – 2021 |
| | Abraham, Spencer | R | MI | U.S. Senate | 1995 – 2001 |
| | Abzug, Bella Savitzky | D | NY | U.S. House | 1971 – 1977 |
| | Ackerman, Gary L. | D | NY | U.S. House | 1983 – 2013 |
| | Adair, Edwin Ross | R | IN | U.S. House | 1951 – 1972 |
| | Adams, Alma | D | NC | U.S. House | 2014 – 2025 |
| | Adams, Brockman (Brock) | D | WA | U.S. Senate | 1965 – 1993 |
| | Adams, Sandy | R | FL | U.S. House | 2011 – 2013 |
| | Adams, Sherman | R | NH | U.S. House | 1945 – 1947 |
| | Addabbo, Joseph Patrick | D | NY | U.S. House | 1961 – 1986 |
| | Addonizio, Hugh Joseph | D | NJ | U.S. House | 1949 – 1962 |
| | Aderholt, Robert | R | AL | U.S. House | 1997 – 2025 |
| | Adler, John | D | NJ | U.S. House | 2009 – 2011 |
| | Agnew, Spiro Theodore | R | | U.S. Senate | 1969 – 1973 |
| | Aguilar, Pete | D | CA | U.S. House | 2015 – 2025 |
| | Aiken, George David | R | VT | U.S. Senate | 1945 – 1979 |
| | Akaka, Daniel K. | D | HI | U.S. Senate | 1977 – 2013 |
| | Akin, Todd | R | MO | U.S. House | 2001 – 2013 |
| | Albert, Carl Bert | D | OK | U.S. House | 1947 – 1977 |
| | Albosta, Donald Joseph | D | MI | U.S. House | 1979 – 1985 |
| | Alexander, Hugh Quincy | D | NC | U.S. House | 1953 – 1963 |
| | Alexander, Lamar | R | TN | U.S. Senate | 2003 – 2021 |
| | Alexander, William Vollie, Jr. | D | AR | U.S. House | 1969 – 1993 |
| | Alford, Mark | R | MO | U.S. House | 2023 – 2025 |
| | Alford, Thomas Dale | D | AR | U.S. House | 1959 – 1963 |
| | Alger, Bruce Reynolds | R | TX | U.S. House | 1955 – 1965 |
| | Allard, Wayne | R | CO | U.S. Senate | 1991 – 2009 |
| | Allen, Asa Leonard | D | LA | U.S. House | 1945 – 1953 |
| | Allen, Clifford Robertson | D | TN | U.S. House | 1975 – 1979 |
| | Allen, George | R | VA | U.S. Senate | 1991 – 2007 |
| | Allen, James Browning | D | AL | U.S. Senate | 1969 – 1978 |
| | Allen, John Joseph, Jr. | R | CA | U.S. House | 1947 – 1959 |
| | Allen, Leo Elwood | R | IL | U.S. House | 1945 – 1961 |
| | Allen, Maryon Pittman | D | AL | U.S. Senate | 1978 – 1978 |
| | Allen, Rick | R | GA | U.S. House | 2015 – 2025 |
| | Allen, Tom | D | ME | U.S. House | 1997 – 2009 |
| | Allott, Gordon Llewellyn | R | CO | U.S. Senate | 1955 – 1973 |
| | Allred, Colin | D | TX | U.S. House | 2019 – 2023 |
| | Almond, James Lindsay, Jr. | D | VA | U.S. House | 1946 – 1948 |
| | Altmire, Jason | D | PA | U.S. House | 2007 – 2013 |
| | Amash, Justin | R | MI | U.S. House | 2011 – 2021 |
| | Ambro, Jerome Anthony, Jr. | D | NY | U.S. House | 1975 – 1981 |
| | Ammerman, Joseph Scofield | D | PA | U.S. House | 1977 – 1979 |
| | Amo, Gabe | D | RI | U.S. House | 2023 – 2025 |
| | Amodei, Mark | R | NV | U.S. House | 2011 – 2025 |
| | Andersen, Herman Carl | R | MN | U.S. House | 1945 – 1963 |
| | Anderson, Clinton Presba | D | NM | U.S. Senate | 1941 – 1973 |
| | Anderson, Glenn Malcolm | D | CA | U.S. House | 1969 – 1993 |
| | Anderson, John Bayard | R | IL | U.S. House | 1961 – 1981 |
| | Anderson, John Zuinglius | R | CA | U.S. House | 1945 – 1953 |
| | Anderson, LeRoy Hagen | D | MT | U.S. House | 1957 – 1961 |
| | Anderson, Wendell Richard | D | MN | U.S. Senate | 1976 – 1978 |
| | Anderson, William Robert | D | TN | U.S. House | 1965 – 1973 |
| | Andresen, August Herman | R | MN | U.S. House | 1945 – 1958 |
| | Andrews, Arthur Glenn | R | AL | U.S. House | 1965 – 1967 |
| | Andrews, Charles | D | FL | U.S. Senate | 1936 – 1946 |
| | Andrews, Elizabeth Bullock | D | AL | U.S. House | 1972 – 1973 |
| | Andrews, George William | D | AL | U.S. House | 1944 – 1971 |
| | Andrews, Ike Franklin | D | NC | U.S. House | 1973 – 1985 |
| | Andrews, Mark | R | ND | U.S. Senate | 1963 – 1991 |
| | Andrews, Michael Allen | D | TX | U.S. House | 1983 – 1995 |
| | Andrews, Robert E. | D | NJ | U.S. House | 1991 – 2014 |
| | Andrews, Thomas Hiram | D | ME | U.S. House | 1991 – 1995 |
| | Andrews, Walter Gresham | R | NY | U.S. House | 1945 – 1949 |
| | Anfuso, Victor L'Episcopo | D | NY | U.S. House | 1951 – 1963 |
| | Angell, Homer Daniel | R | OR | U.S. House | 1945 – 1955 |
| | Annunzio, Frank | D | IL | U.S. House | 1965 – 1993 |
| | Anthony, Beryl Franklin, Jr. | D | AR | U.S. House | 1979 – 1993 |
| | Applegate, Douglas Earl | D | OH | U.S. House | 1977 – 1995 |
| | Archer, William Reynolds | R | TX | U.S. House | 1971 – 2003 |
| | Arcuri, Michael | D | NY | U.S. House | 2007 – 2011 |
| | Arends, Leslie Cornelius | R | IL | U.S. House | 1945 – 1975 |
| | Armey, Richard Keith | R | TX | U.S. House | 1985 – 2003 |
| | Armstrong, Kelly | R | ND | U.S. House | 2019 – 2025 |
| | Armstrong, Orland Kay | R | MO | U.S. House | 1951 – 1953 |
| | Armstrong, William Lester | R | CO | U.S. Senate | 1973 – 1993 |
| | Arnold, Samuel Washington | R | MO | U.S. House | 1945 – 1949 |
| | Arrington, Jodey | R | TX | U.S. House | 2017 – 2025 |
| | Ashbrook, Jean Spencer | R | OH | U.S. House | 1982 – 1983 |
| | Ashbrook, John Milan | R | OH | U.S. House | 1961 – 1982 |
| | Ashcroft, John | R | MO | U.S. Senate | 1995 – 2001 |
| | Ashford, Brad | D | NE | U.S. House | 2015 – 2017 |
| | Ashley, Thomas William Ludlow | D | OH | U.S. House | 1955 – 1981 |
| | Ashmore, Robert Thomas | D | SC | U.S. House | 1953 – 1969 |
| | Aspin, Les | D | WI | U.S. House | 1971 – 1993 |
| | Aspinall, Wayne Norviel | D | CO | U.S. House | 1949 – 1973 |
| | Atkins, Chester Greenough | D | MA | U.S. House | 1985 – 1993 |
| | Atkinson, Eugene Vincent | D | PA | U.S. House | 1979 – 1983 |
| | Auchincloss, Jake | D | MA | U.S. House | 2021 – 2025 |
| | Auchincloss, James Coats | R | NJ | U.S. House | 1945 – 1965 |
| | Aucoin, Les | D | OR | U.S. House | 1975 – 1993 |
| | Austin, Warren Robinson | R | VT | U.S. Senate | 1945 – 1946 |
| | Austria, Steve | R | OH | U.S. House | 2009 – 2013 |
| | Avery, William Henry | R | KS | U.S. House | 1955 – 1965 |
| | Axne, Cindy | D | IA | U.S. House | 2019 – 2023 |
| | Ayotte, Kelly | R | NH | U.S. Senate | 2011 – 2017 |
| | Ayres, William Hanes | R | OH | U.S. House | 1951 – 1972 |