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|  | Babin, Brian | R | TX | U.S. House | 2015 – 2025 |
| | Baca, Joe | D | CA | U.S. House | 1999 – 2013 |
| | Bacchus, James | D | FL | U.S. House | 1991 – 1995 |
| | Bachmann, Michele | R | MN | U.S. House | 2007 – 2015 |
| | Bachus, Spencer | R | AL | U.S. House | 1993 – 2015 |
| | Bacon, Don | R | NE | U.S. House | 2017 – 2025 |
| | Badham, Robert Edward | R | CA | U.S. House | 1977 – 1989 |
| | Badillo, Herman | D | NY | U.S. House | 1971 – 1979 |
| | Baesler, Scotty | D | KY | U.S. House | 1993 – 1999 |
| | Bafalis, Louis Arthur | R | FL | U.S. House | 1973 – 1983 |
| | Bailey, Cleveland Monroe | D | WV | U.S. House | 1945 – 1963 |
| | Bailey, Donald Allen | D | PA | U.S. House | 1979 – 1983 |
| | Bailey, Josiah William | D | NC | U.S. Senate | 1931 – 1946 |
| | Bailey, R. Wendell | R | MO | U.S. House | 1981 – 1983 |
| | Baird, Brian | D | WA | U.S. House | 1999 – 2011 |
| | Baird, Jim | R | IN | U.S. House | 2019 – 2025 |
| | Baker, Howard Henry, Jr. | R | TN | U.S. Senate | 1967 – 1985 |
| | Baker, Howard Henry | R | TN | U.S. House | 1951 – 1964 |
| | Baker, Irene Bailey | R | TN | U.S. House | 1964 – 1965 |
| | Baker, LaMar | R | TN | U.S. House | 1971 – 1975 |
| | Baker, Richard H. | R | LA | U.S. House | 1987 – 2008 |
| | Baker, William | R | CA | U.S. House | 1993 – 1997 |
| | Bakewell, Claude Ignatius | R | MO | U.S. House | 1947 – 1953 |
| | Baldacci, John Elias | D | ME | U.S. House | 1995 – 2003 |
| | Balderson, Troy | R | OH | U.S. House | 2018 – 2025 |
| | Baldus, Alvin James | D | WI | U.S. House | 1975 – 1981 |
| | Baldwin, Harry Streett | D | MD | U.S. House | 1945 – 1947 |
| | Baldwin, John Finley, Jr. | R | CA | U.S. House | 1955 – 1966 |
| | Baldwin, Joseph Clark | R | NY | U.S. House | 1941 – 1947 |
| | Baldwin, Raymond Earl | R | CT | U.S. Senate | 1947 – 1949 |
| | Baldwin, Tammy | D | WI | U.S. Senate | 1999 – 2025 |
| | Balint, Becca | D | VT | U.S. House | 2023 – 2025 |
| | Ball, Joseph Hurst | R | MN | U.S. Senate | 1943 – 1949 |
| | Ballance, Frank | D | NC | U.S. House | 2003 – 2005 |
| | Ballenger, Cass | R | NC | U.S. House | 1987 – 2005 |
| | Bandstra, Bert Andrew | D | IA | U.S. House | 1965 – 1967 |
| | Bankhead, John Hollis II | D | AL | U.S. Senate | 1945 – 1946 |
| | Banks, Jim | R | IN | U.S. House | 2017 – 2025 |
| | Banta, Parke Monroe | R | MO | U.S. House | 1947 – 1949 |
| | Barber, Ron | D | AZ | U.S. House | 2012 – 2015 |
| | Barca, Peter William | D | WI | U.S. House | 1993 – 1995 |
| | Barcia, James A. | D | MI | U.S. House | 1993 – 2003 |
| | Barden, Graham Arthur | D | NC | U.S. House | 1945 – 1961 |
| | Baring, Walter Stephan, Jr. | D | NV | U.S. House | 1949 – 1973 |
| | Barkley, Alben William | D | KY | U.S. Senate | 1913 – 1956 |
| | Barkley, Dean | I | MN | U.S. Senate | 2002 – 2003 |
| | Barletta, Lou | R | PA | U.S. House | 2011 – 2019 |
| | Barlow, Thomas J., III | D | KY | U.S. House | 1993 – 1995 |
| | Barnard, Druie Douglas, Jr. | D | GA | U.S. House | 1977 – 1993 |
| | Barnes, Michael Darr | D | MD | U.S. House | 1979 – 1987 |
| | Barr, Andy | R | KY | U.S. House | 2013 – 2025 |
| | Barr, Bob | R | GA | U.S. House | 1995 – 2003 |
| | Barr, Joseph Walker | D | IN | U.S. House | 1959 – 1961 |
| | Barragan, Nanette | D | CA | U.S. House | 2017 – 2025 |
| | Barrasso, John | R | WY | U.S. Senate | 2007 – 2025 |
| | Barrett, Frank Aloysius | R | WY | U.S. Senate | 1943 – 1959 |
| | Barrett, J. Gresham | R | SC | U.S. House | 2003 – 2011 |
| | Barrett, Thomas M. | D | WI | U.S. House | 1993 – 2003 |
| | Barrett, William Aloysius | D | PA | U.S. House | 1945 – 1976 |
| | Barrett, William E. | R | NE | U.S. House | 1991 – 2001 |
| | Barrow, John | D | GA | U.S. House | 2005 – 2015 |
| | Barry, Robert Raymond | R | NY | U.S. House | 1959 – 1965 |
| | Barry, William Bernard | D | NY | U.S. House | 1935 – 1946 |
| | Bartlett, Dewey Follett | R | OK | U.S. Senate | 1973 – 1979 |
| | Bartlett, Edward Lewis (Bob) | D | AK | U.S. Senate | 1959 – 1968 |
| | Bartlett, Harry Stephen (Steve) | R | TX | U.S. House | 1983 – 1991 |
| | Bartlett, Roscoe G. | R | MD | U.S. House | 1993 – 2013 |
| | Barton, Joe L. | R | TX | U.S. House | 1985 – 2019 |
| | Bass, Charles | R | NH | U.S. House | 1995 – 2013 |
| | Bass, Karen | D | CA | U.S. House | 2011 – 2022 |
| | Bass, Perkins | R | NH | U.S. House | 1955 – 1963 |
| | Bass, Ross | D | TN | U.S. Senate | 1955 – 1967 |
| | Bateman, Herbert H. | R | VA | U.S. House | 1983 – 2001 |
| | Bates, George Joseph | R | MA | U.S. House | 1945 – 1949 |
| | Bates, Jim | D | CA | U.S. House | 1983 – 1991 |
| | Bates, Joseph Bengal | D | KY | U.S. House | 1945 – 1953 |
| | Bates, William Henry | R | MA | U.S. House | 1950 – 1969 |
| | Battin, James Franklin | R | MT | U.S. House | 1961 – 1969 |
| | Battle, Laurie Calvin | D | AL | U.S. House | 1947 – 1955 |
| | Baucus, Max | D | MT | U.S. Senate | 1975 – 2014 |
| | Bauman, Robert Edmund | R | MD | U.S. House | 1973 – 1981 |
| | Baumhart, Albert David, Jr. | R | OH | U.S. House | 1955 – 1961 |
| | Bayh, Birch Evan | D | IN | U.S. Senate | 1963 – 1981 |
| | Bayh, Evan | D | IN | U.S. Senate | 1999 – 2011 |
| | Beall, James Glenn | R | MD | U.S. Senate | 1943 – 1965 |
| | Beall, John Glenn, Jr. | R | MD | U.S. Senate | 1969 – 1977 |
| | Beamer, John Valentine | R | IN | U.S. House | 1951 – 1959 |
| | Bean, Aaron | R | FL | U.S. House | 2023 – 2025 |
| | Bean, Melissa | D | IL | U.S. House | 2005 – 2011 |
| | Beard, Edward Peter | D | RI | U.S. House | 1975 – 1981 |
| | Beard, Robin Leo, Jr. | R | TN | U.S. House | 1973 – 1983 |
| | Beatty, Joyce | D | OH | U.S. House | 2013 – 2025 |
| | Beauprez, Bob | R | CO | U.S. House | 2003 – 2007 |
| | Becerra, Xavier | D | CA | U.S. House | 1993 – 2017 |
| | Becker, Frank John | R | NY | U.S. House | 1953 – 1965 |
| | Beckworth, Lindley Garrison, Sr. | D | TX | U.S. House | 1945 – 1967 |
| | Bedell, Berkley Warren | D | IA | U.S. House | 1975 – 1987 |
| | Beermann, Ralph Frederick | R | NE | U.S. House | 1961 – 1965 |
| | Begich, Mark | D | AK | U.S. Senate | 2009 – 2015 |
| | Begich, Nicholas Joseph | D | AK | U.S. House | 1971 – 1972 |
| | Beilenson, Anthony Charles | D | CA | U.S. House | 1977 – 1997 |
| | Belcher, Page Henry | R | OK | U.S. House | 1951 – 1973 |
| | Bell, Alphonzo | R | CA | U.S. House | 1961 – 1977 |
| | Bell, Charles Jasper | D | MO | U.S. House | 1945 – 1949 |
| | Bell, John Junior | D | TX | U.S. House | 1955 – 1957 |
| | Bell, R. | D | TX | U.S. House | 2003 – 2005 |
| | Bellmon, Henry Louis | R | OK | U.S. Senate | 1969 – 1981 |
| | Bender, George Harrison | R | OH | U.S. Senate | 1939 – 1957 |
| | Benedict, Cleveland Keith | R | WV | U.S. House | 1981 – 1983 |
| | Benishek, Dan | R | MI | U.S. House | 2011 – 2017 |
| | Benjamin, Adam, Jr. | D | IN | U.S. House | 1977 – 1982 |
| | Bennet, Augustus Witschief | R | NY | U.S. House | 1945 – 1947 |
| | Bennet, Michael | D | CO | U.S. Senate | 2009 – 2025 |
| | Bennett, Charles Edward | D | FL | U.S. House | 1949 – 1993 |
| | Bennett, John Bonifas | R | MI | U.S. House | 1947 – 1964 |
| | Bennett, Marion Tinsley | R | MO | U.S. House | 1945 – 1949 |
| | Bennett, Robert F. | R | UT | U.S. Senate | 1993 – 2011 |
| | Bennett, Wallace Foster | R | UT | U.S. Senate | 1951 – 1975 |
| | Bentivolio, Kerry | R | MI | U.S. House | 2013 – 2015 |
| | Bentley, Alvin Morell | R | MI | U.S. House | 1953 – 1961 |
| | Bentley, Helen Delich | R | MD | U.S. House | 1985 – 1995 |
| | Benton, William | D | CT | U.S. Senate | 1949 – 1953 |
| | Bentsen, Ken | D | TX | U.S. House | 1995 – 2003 |
| | Bentsen, Lloyd Millard, Jr. | D | TX | U.S. Senate | 1948 – 1993 |
| | Bentz, Cliff | R | OR | U.S. House | 2021 – 2025 |
| | Bera, Ami | D | CA | U.S. House | 2013 – 2025 |
| | Bereuter, Doug | R | NE | U.S. House | 1979 – 2005 |
| | Berg, Rick | R | ND | U.S. House | 2011 – 2013 |
| | Bergland, Robert Selmer | D | MN | U.S. House | 1971 – 1977 |
| | Bergman, Jack | R | MI | U.S. House | 2017 – 2025 |
| | Berkley, Shelley | D | NV | U.S. House | 1999 – 2013 |
| | Berman, Howard L. | D | CA | U.S. House | 1983 – 2013 |
| | Berry, Ellis Yarnal | R | SD | U.S. House | 1951 – 1972 |
| | Berry, Marion | D | AR | U.S. House | 1997 – 2011 |
| | Bethune, Edwin Ruthvin, Jr. | R | AR | U.S. House | 1979 – 1985 |
| | Betts, Jackson Edward | R | OH | U.S. House | 1951 – 1973 |
| | Bevill, Tom | D | AL | U.S. House | 1967 – 1997 |
| | Beyer, Donald | D | VA | U.S. House | 2015 – 2025 |
| | Biaggi, Mario | D | NY | U.S. House | 1969 – 1989 |
| | Bible, Alan Harvey | D | NV | U.S. Senate | 1954 – 1975 |
| | Bice, Stephanie | R | OK | U.S. House | 2021 – 2025 |
| | Biden, Joseph R. Jr. | D | | U.S. President | 1973 – 2025 |
| | Biemiller, Andrew John | D | WI | U.S. House | 1945 – 1951 |
| | Biester, Edward George, Jr. | R | PA | U.S. House | 1967 – 1977 |
| | Biggert, Judy | R | IL | U.S. House | 1999 – 2013 |
| | Biggs, Andy | R | AZ | U.S. House | 2017 – 2025 |
| | Bilbo, Theodore Gilmore | D | MS | U.S. Senate | 1945 – 1947 |
| | Bilbray, Brian P. | R | CA | U.S. House | 1995 – 2013 |
| | Bilbray, James Hubert | D | NV | U.S. House | 1987 – 1995 |
| | Bilirakis, Gus | R | FL | U.S. House | 2007 – 2025 |
| | Bilirakis, Michael | R | FL | U.S. House | 1983 – 2007 |
| | Bingaman, Jeff | D | NM | U.S. Senate | 1983 – 2013 |
| | Bingham, Jonathan Brewster | D | NY | U.S. House | 1965 – 1983 |
| | Bishop, Cecil William (Runt) | R | IL | U.S. House | 1941 – 1955 |
| | Bishop, Dan | R | NC | U.S. House | 2019 – 2025 |
| | Bishop, Mike | R | MI | U.S. House | 2015 – 2019 |
| | Bishop, Rob | R | UT | U.S. House | 2003 – 2021 |
| | Bishop, Sanford | D | GA | U.S. House | 1993 – 2025 |
| | Black, Diane | R | TN | U.S. House | 2011 – 2019 |
| | Blackburn, Benjamin Bentley | R | GA | U.S. House | 1967 – 1975 |
| | Blackburn, Marsha | R | TN | U.S. Senate | 2003 – 2025 |
| | Blackney, William Wallace | R | MI | U.S. House | 1945 – 1953 |
| | Blackwell, Lucien Edward | D | PA | U.S. House | 1991 – 1995 |
| | Blagojevich, Rod R. | D | IL | U.S. House | 1997 – 2003 |
| | Blakley, William Arvis | D | TX | U.S. Senate | 1957 – 1961 |
| | Blanchard, James Johnston | D | MI | U.S. House | 1975 – 1983 |
| | Bland, Schuyler Otis | D | VA | U.S. House | 1918 – 1950 |
| | Blanton, Leonard Ray | D | TN | U.S. House | 1967 – 1973 |
| | Blatnik, John Anton | D | MN | U.S. House | 1947 – 1975 |
| | Bliley, Thomas Jerome, Jr. | R | VA | U.S. House | 1981 – 2001 |
| | Blitch, Iris Faircloth | D | GA | U.S. House | 1955 – 1963 |
| | Bloom, Sol | D | NY | U.S. House | 1923 – 1949 |
| | Blouin, Michael Thomas | D | IA | U.S. House | 1975 – 1979 |
| | Blum, Rod | R | IA | U.S. House | 2015 – 2019 |
| | Blumenauer, Earl | D | OR | U.S. House | 1996 – 2025 |
| | Blumenthal, Richard | D | CT | U.S. Senate | 2011 – 2029 |
| | Blunt, Roy | R | MO | U.S. Senate | 1997 – 2023 |
| | Blute, Peter I. | R | MA | U.S. House | 1993 – 1997 |
| | Boccieri, John | D | OH | U.S. House | 2009 – 2011 |
| | Boebert, Lauren | R | CO | U.S. House | 2021 – 2025 |
| | Boehlert, Sherwood | R | NY | U.S. House | 1983 – 2007 |
| | Boehner, John A. | R | OH | U.S. House | 1991 – 2015 |
| | Boggs, Corinne Claiborne (Lindy) | D | LA | U.S. House | 1973 – 1991 |
| | Boggs, James Caleb | R | DE | U.S. Senate | 1947 – 1973 |
| | Boggs, Thomas Hale, Sr. | D | LA | U.S. House | 1947 – 1973 |
| | Boland, Edward Patrick | D | MA | U.S. House | 1953 – 1989 |
| | Bolling, Richard Walker | D | MO | U.S. House | 1949 – 1983 |
| | Bolton, Frances Payne | R | OH | U.S. House | 1945 – 1969 |
| | Bolton, Oliver Payne | R | OH | U.S. House | 1953 – 1965 |
| | Bolton, William P. | D | MD | U.S. House | 1949 – 1969 |
| | Bonamici, Suzanne | D | OR | U.S. House | 2012 – 2025 |
| | Bond, Christopher S. | R | MO | U.S. Senate | 1987 – 2011 |
| | Boner, William Hill | D | TN | U.S. House | 1979 – 1987 |
| | Bonilla, Henry | R | TX | U.S. House | 1993 – 2007 |
| | Bonin, Edward John | R | PA | U.S. House | 1953 – 1955 |
| | Bonior, David Edward | D | MI | U.S. House | 1977 – 2003 |
| | Bonker, Don Leroy | D | WA | U.S. House | 1975 – 1989 |
| | Bonner, Herbert Covington | D | NC | U.S. House | 1945 – 1965 |
| | Bonner, Jo | R | AL | U.S. House | 2003 – 2013 |
| | Bono Mack, Mary | R | CA | U.S. House | 1998 – 2013 |
| | Bono, Sonny | R | CA | U.S. House | 1995 – 1998 |
| | Booker, Cory | D | NJ | U.S. Senate | 2013 – 2027 |
| | Boozman, John | R | AR | U.S. Senate | 2001 – 2025 |
| | Boren, Dan | D | OK | U.S. House | 2005 – 2013 |
| | Boren, David Lyle | D | OK | U.S. Senate | 1979 – 1994 |
| | Boren, Lyle H. | D | OK | U.S. House | 1945 – 1947 |
| | Borski, Robert Anthony | D | PA | U.S. House | 1983 – 2003 |
| | Bosch, Albert Henry | R | NY | U.S. House | 1953 – 1960 |
| | Boschwitz, Rudolph Eli (Rudy) | R | MN | U.S. Senate | 1979 – 1995 |
| | Bosco, Douglas Harry | D | CA | U.S. House | 1983 – 1991 |
| | Bosone, Reva Zilpha Beck | D | UT | U.S. House | 1949 – 1953 |
| | Bost, Mike | R | IL | U.S. House | 2015 – 2025 |
| | Boswell, Leonard L. | D | IA | U.S. House | 1997 – 2013 |
| | Bottum, Joseph H | R | SD | U.S. Senate | 1962 – 1963 |
| | Boucher, Rick | D | VA | U.S. House | 1983 – 2011 |
| | Boulter, Eldon Beau | R | TX | U.S. House | 1985 – 1989 |
| | Bourdeaux, Carolyn | D | GA | U.S. House | 2021 – 2023 |
| | Boustany, Charles | R | LA | U.S. House | 2005 – 2017 |
| | Bow, Frank Townsend | R | OH | U.S. House | 1951 – 1973 |
| | Bowen, David Reece | D | MS | U.S. House | 1973 – 1983 |
| | Bowler, James Bernard | D | IL | U.S. House | 1953 – 1957 |
| | Bowles, Chester Bliss | D | CT | U.S. House | 1959 – 1961 |
| | Bowman, Jamaal | D | NY | U.S. House | 2021 – 2025 |
| | Bowring, Eva Kelly | R | NE | U.S. Senate | 1954 – 1954 |
| | Boxer, Barbara | D | CA | U.S. Senate | 1983 – 2017 |
| | Boyd, Allen | D | FL | U.S. House | 1997 – 2011 |
| | Boyda, Nancy | D | KS | U.S. House | 2007 – 2009 |
| | Boykin, Frank William | D | AL | U.S. House | 1945 – 1963 |
| | Boyle, Brendan | D | PA | U.S. House | 2015 – 2025 |
| | Boyle, Charles Augustus | D | IL | U.S. House | 1955 – 1959 |
| | Brademas, John | D | IN | U.S. House | 1959 – 1981 |
| | Bradley, Frederick Van Ness | R | MI | U.S. House | 1945 – 1947 |
| | Bradley, Jeb | R | NH | U.S. House | 2003 – 2007 |
| | Bradley, Michael Joseph | D | PA | U.S. House | 1945 – 1947 |
| | Bradley, William Warren | D | NJ | U.S. Senate | 1979 – 1997 |
| | Bradley, Willis Winter | R | CA | U.S. House | 1947 – 1949 |
| | Brady, Kevin | R | TX | U.S. House | 1997 – 2023 |
| | Brady, Nicholas Frederick | R | NJ | U.S. Senate | 1982 – 1982 |
| | Brady, Robert A. | D | PA | U.S. House | 1998 – 2019 |
| | Braley, Bruce | D | IA | U.S. House | 2007 – 2015 |
| | Bramblett, Ernest King | R | CA | U.S. House | 1947 – 1955 |
| | Brasco, Frank James | D | NY | U.S. House | 1967 – 1975 |
| | Brat, Dave | R | VA | U.S. House | 2014 – 2019 |
| | Braun, Mike | R | IN | U.S. Senate | 2019 – 2025 |
| | Bray, William Gilmer | R | IN | U.S. House | 1951 – 1975 |
| | Brecheen, Josh | R | OK | U.S. House | 2023 – 2025 |
| | Breckinridge, John Bayne | D | KY | U.S. House | 1973 – 1979 |
| | Breeding, James Floyd | D | KS | U.S. House | 1957 – 1963 |
| | Breen, Edward Grimes | D | OH | U.S. House | 1949 – 1951 |
| | Brehm, Walter Ellsworth | R | OH | U.S. House | 1945 – 1953 |
| | Brennan, Joseph Edward | D | ME | U.S. House | 1987 – 1991 |
| | Brewster, Daniel Baugh | D | MD | U.S. Senate | 1959 – 1969 |
| | Brewster, Ralph Owen | R | ME | U.S. Senate | 1945 – 1953 |
| | Brewster, William K. | D | OK | U.S. House | 1991 – 1997 |
| | Bricker, John William | R | OH | U.S. Senate | 1947 – 1959 |
| | Bridenstine, Jim | R | OK | U.S. House | 2013 – 2018 |
| | Bridges, Henry Styles | R | NH | U.S. Senate | 1943 – 1961 |
| | Briggs, Frank Parks | D | MO | U.S. Senate | 1945 – 1947 |
| | Bright, Bobby | D | AL | U.S. House | 2009 – 2011 |
| | Brindisi, Anthony | D | NY | U.S. House | 2019 – 2021 |
| | Brinkley, Jack Thomas | D | GA | U.S. House | 1967 – 1983 |
| | Britt, Charles Robin | D | NC | U.S. House | 1983 – 1985 |
| | Britt, Katie | R | AL | U.S. Senate | 2023 – 2029 |
| | Brock, Lawrence | D | NE | U.S. House | 1959 – 1961 |
| | Brock, William Emerson, III | R | TN | U.S. Senate | 1963 – 1977 |
| | Brodhead, William McNulty | D | MI | U.S. House | 1975 – 1983 |
| | Bromwell, James Edward | R | IA | U.S. House | 1961 – 1965 |
| | Brooke, Edward William, III | R | MA | U.S. Senate | 1967 – 1979 |
| | Brooks, Charles Wayland | R | IL | U.S. Senate | 1940 – 1949 |
| | Brooks, Jack Bascom | D | TX | U.S. House | 1953 – 1995 |
| | Brooks, Mo | R | AL | U.S. House | 2011 – 2023 |
| | Brooks, Overton | D | LA | U.S. House | 1945 – 1961 |
| | Brooks, Susan W. | R | IN | U.S. House | 2013 – 2021 |
| | Broomfield, William S. | R | MI | U.S. House | 1957 – 1993 |
| | Brophy, John Charles | R | WI | U.S. House | 1947 – 1949 |
| | Brotzman, Donald Glenn | R | CO | U.S. House | 1963 – 1975 |
| | Broughton, Joseph Melville | D | NC | U.S. Senate | 1948 – 1949 |
| | Broun, Paul | R | GA | U.S. House | 2007 – 2015 |
| | Browder, John Glen | D | AL | U.S. House | 1989 – 1997 |
| | Brown, Anthony | D | MD | U.S. House | 2017 – 2023 |
| | Brown, Charles Harrison | D | MO | U.S. House | 1957 – 1961 |
| | Brown, Clarence J., Jr. | R | OH | U.S. House | 1966 – 1983 |
| | Brown, Clarence J. | R | OH | U.S. House | 1945 – 1965 |
| | Brown, Corrine | D | FL | U.S. House | 1993 – 2017 |
| | Brown, Ernest S | R | NV | U.S. Senate | 1954 – 1955 |
| | Brown, Garry Eldridge | R | MI | U.S. House | 1967 – 1979 |
| | Brown, George Edward, Jr. | D | CA | U.S. House | 1963 – 1999 |
| | Brown, George | R | CO | U.S. Senate | 1981 – 1997 |
| | Brown, Henry E. Jr. | R | SC | U.S. House | 2001 – 2011 |
| | Brown, Paul | D | GA | U.S. House | 1945 – 1961 |
| | Brown, Scott P. | R | MA | U.S. Senate | 2010 – 2013 |
| | Brown, Sherrod | D | OH | U.S. Senate | 1993 – 2025 |
| | Brown, Shontel | D | OH | U.S. House | 2021 – 2025 |
| | Brown-Waite, Ginny | R | FL | U.S. House | 2003 – 2011 |
| | Brownback, Sam | R | KS | U.S. Senate | 1995 – 2011 |
| | Brownley, Julia | D | CA | U.S. House | 2013 – 2025 |
| | Brownson, Charles Bruce | R | IN | U.S. House | 1951 – 1959 |
| | Broyhill, James Thomas | R | NC | U.S. House | 1963 – 1986 |
| | Broyhill, Joel Thomas | R | VA | U.S. House | 1953 – 1975 |
| | Bruce, Donald Cogley | R | IN | U.S. House | 1961 – 1965 |
| | Bruce, Terry Lee | D | IL | U.S. House | 1985 – 1993 |
| | Brumbaugh, David Emmert | R | PA | U.S. House | 1945 – 1947 |
| | Brunsdale, Clarence Norman | R | ND | U.S. Senate | 1960 – 1961 |
| | Bryan, Richard H. | D | NV | U.S. Senate | 1989 – 2001 |
| | Bryant, Edward G. | R | TN | U.S. House | 1995 – 2003 |
| | Bryant, John Wiley | D | TX | U.S. House | 1983 – 1997 |
| | Bryson, Joseph Raleigh | D | SC | U.S. House | 1945 – 1953 |
| | Buchanan, Frank | D | PA | U.S. House | 1946 – 1951 |
| | Buchanan, John Hall, Jr. | R | AL | U.S. House | 1965 – 1981 |
| | Buchanan, Vera Daerr | D | PA | U.S. House | 1951 – 1955 |
| | Buchanan, Vern | R | FL | U.S. House | 2007 – 2025 |
| | Buck, Clayton Douglass | R | DE | U.S. Senate | 1943 – 1949 |
| | Buck, Ellsworth Brewer | R | NY | U.S. House | 1945 – 1949 |
| | Buck, Ken | R | CO | U.S. House | 2015 – 2025 |
| | Buckley, Charles Anthony | D | NY | U.S. House | 1935 – 1965 |
| | Buckley, James Lane | C | NY | U.S. Senate | 1971 – 1977 |
| | Buckley, James Vincent | D | IL | U.S. House | 1949 – 1952 |
| | Bucshon, Larry | R | IN | U.S. House | 2011 – 2025 |
| | Budd, Ted | R | NC | U.S. House | 2017 – 2029 |
| | Budge, Hamer Harold | R | ID | U.S. House | 1951 – 1961 |
| | Budzinski, Nikki | D | IL | U.S. House | 2023 – 2025 |
| | Buechner, John William (Jack) | R | MO | U.S. House | 1987 – 1991 |
| | Buerkle, Ann Marie | R | NY | U.S. House | 2011 – 2013 |
| | Buffett, Howard Homan | R | NE | U.S. House | 1945 – 1953 |
| | Bulwinkle, Alfred Lee | D | NC | U.S. House | 1945 – 1950 |
| | Bumpers, Dale L. | D | AR | U.S. Senate | 1975 – 1999 |
| | Bunker, Berkeley Lloyd | D | NV | U.S. House | 1940 – 1947 |
| | Bunn, Jim | R | OR | U.S. House | 1995 – 1997 |
| | Bunning, Jim | R | KY | U.S. Senate | 1987 – 2011 |
| | Burch, Thomas Granville | D | VA | U.S. House | 1931 – 1946 |
| | Burchett, Tim | R | TN | U.S. House | 2019 – 2025 |
| | Burdick, Jocelyn Birch | D | ND | U.S. Senate | 1992 – 1992 |
| | Burdick, Quentin Northrop | D | ND | U.S. Senate | 1959 – 1997 |
| | Burdick, Usher Lloyd | R | ND | U.S. House | 1949 – 1959 |
| | Burgener, Clair Walter | R | CA | U.S. House | 1973 – 1983 |
| | Burgess, Michael | R | TX | U.S. House | 2003 – 2025 |
| | Burgin, William Olin | D | NC | U.S. House | 1945 – 1946 |
| | Burke, Frank Welsh | D | KY | U.S. House | 1959 – 1963 |
| | Burke, J. Herbert | R | FL | U.S. House | 1967 – 1979 |
| | Burke, James Anthony | D | MA | U.S. House | 1959 – 1979 |
| | Burke, Raymond Hugh | R | OH | U.S. House | 1947 – 1949 |
| | Burke, Thomas Henry | D | OH | U.S. House | 1949 – 1952 |
| | Burke, Thomas | D | OH | U.S. Senate | 1954 – 1954 |
| | Burke, Yvonne Brathwaite | D | CA | U.S. House | 1973 – 1979 |
| | Burkhalter, Everett Glen | D | CA | U.S. House | 1963 – 1965 |
| | Burleson, Omar Truman | D | TX | U.S. House | 1947 – 1979 |
| | Burlison, Eric | R | MO | U.S. House | 2023 – 2025 |
| | Burlison, William Dean | D | MO | U.S. House | 1969 – 1981 |
| | Burns, Conrad | R | MT | U.S. Senate | 1989 – 2007 |
| | Burns, O. | R | GA | U.S. House | 2003 – 2005 |
| | Burnside, Maurice Gwinn | D | WV | U.S. House | 1949 – 1957 |
| | Burr, Richard | R | NC | U.S. Senate | 1995 – 2025 |
| | Burris, Roland W. | D | IL | U.S. Senate | 2009 – 2011 |
| | Burton, Clarence Godber | D | VA | U.S. House | 1948 – 1953 |
| | Burton, Dan | R | IN | U.S. House | 1983 – 2013 |
| | Burton, Harold Hitz | R | OH | U.S. Senate | 1945 – 1945 |
| | Burton, John Lowell | D | CA | U.S. House | 1974 – 1983 |
| | Burton, Laurence Junior | R | UT | U.S. House | 1963 – 1972 |
| | Burton, Phillip | D | CA | U.S. House | 1964 – 1983 |
| | Burton, Sala Galante | D | CA | U.S. House | 1983 – 1987 |
| | Busbey, Fred Ernst | R | IL | U.S. House | 1947 – 1955 |
| | Bush, Alvin Ray | R | PA | U.S. House | 1951 – 1959 |
| | Bush, Cori | D | MO | U.S. House | 2021 – 2025 |
| | Bush, George Herbert Walker | R | | U.S. President | 1967 – 1992 |
| | Bush, Prescott Sheldon | R | CT | U.S. Senate | 1953 – 1963 |
| | Bushfield, Harlan John | R | SD | U.S. Senate | 1943 – 1948 |
| | Bushfield, Vera Cahalan | R | SD | U.S. Senate | 1948 – 1948 |
| | Bustamante, Albert Garza | D | TX | U.S. House | 1985 – 1993 |
| | Bustos, Cheri | D | IL | U.S. House | 2013 – 2023 |
| | Butler, Hugh Alfred | R | NE | U.S. Senate | 1945 – 1954 |
| | Butler, John Cornelius | R | NY | U.S. House | 1945 – 1953 |
| | Butler, John Marshall | R | MD | U.S. Senate | 1951 – 1963 |
| | Butler, Laphonza | D | CA | U.S. Senate | 2023 – 2025 |
| | Butler, Manley Caldwell | R | VA | U.S. House | 1973 – 1983 |
| | Butterfield, G.K. | D | NC | U.S. House | 2004 – 2022 |
| | Button, Daniel Evan | R | NY | U.S. House | 1967 – 1972 |
| | Buyer, Steve | R | IN | U.S. House | 1993 – 2011 |
| | Byrd, Harry Flood, Jr. | I | VA | U.S. Senate | 1965 – 1983 |
| | Byrd, Harry Flood | D | VA | U.S. Senate | 1933 – 1965 |
| | Byrd, Robert C. | D | WV | U.S. Senate | 1953 – 2010 |
| | Byrne, Bradley | R | AL | U.S. House | 2014 – 2021 |
| | Byrne, Emmet Francis | R | IL | U.S. House | 1957 – 1959 |
| | Byrne, James Aloysius | D | PA | U.S. House | 1953 – 1973 |
| | Byrne, Leslie Larkin | D | VA | U.S. House | 1993 – 1995 |
| | Byrne, William Thomas | D | NY | U.S. House | 1945 – 1952 |
| | Byrnes, John William | R | WI | U.S. House | 1945 – 1973 |
| | Byron, Beverly Barton Butcher | D | MD | U.S. House | 1979 – 1993 |
| | Byron, Goodloe Edgar | D | MD | U.S. House | 1971 – 1979 |
| | Rochester, Lisa Blunt | D | DE | U.S. House | 2017 – 2025 |