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Members of Congress By Last Name

Browse Members by Congress
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   Member Name Sort ascending alphabetically Sort descending alphabetically Party Sort by party State Sort ascending Sort descending Chamber Sort by chamber Term Sort ascending Sort descending
O'Brien, George DonoghueDMIU.S. House1937 – 1955
O'Brien, George MillerRILU.S. House1973 – 1986
O'Brien, Leo WilliamDNYU.S. House1952 – 1967
O'Brien, Thomas JosephDILU.S. House1945 – 1965
O'Connor, James FrancisDMTU.S. House1945 – 1945
O'Conor, Herbert RomulusDMDU.S. Senate1947 – 1953
O'Daniel, Wilbert Lee (Pappy)DTXU.S. Senate1943 – 1949
O'Halleran, TomDAZU.S. House2017 – 2023
O'Hara, BarrattDILU.S. House1949 – 1969
O'Hara, James GrantDMIU.S. House1959 – 1977
O'Hara, Joseph PatrickRMNU.S. House1945 – 1959
O'Konski, Alvin EdwardRWIU.S. House1945 – 1973
O'Mahoney, Joseph ChristopherDWYU.S. Senate1945 – 1961
O'Neal, EmmetDKYU.S. House1945 – 1947
O'Neal, Maston Emmett, Jr.DGAU.S. House1965 – 1972
O'Neill, Harry PatrickDPAU.S. House1949 – 1953
O'Neill, Thomas Phillip, Jr. (Tip)DMAU.S. House1953 – 1987
O'Rourke, BetoDTXU.S. House2013 – 2019
O'Sullivan, Eugene DanielDNEU.S. House1949 – 1952
O'Toole, Donald LawrenceDNYU.S. House1945 – 1953
Oakar, Mary RoseDOHU.S. House1977 – 1993
Oakman, Charles GibbRMIU.S. House1953 – 1955
Obama, BarackDU.S. President2005 – 2017
Obernolte, JayRCAU.S. House2021 – 2025
Oberstar, James L.DMNU.S. House1975 – 2011
Obey, David R.DWIU.S. House1969 – 2011
Ocasio-Cortez, AlexandriaDNYU.S. House2019 – 2025
Ogles, AndyRTNU.S. House2023 – 2025
Olin, James R.DVAU.S. House1983 – 1993
Oliver, James ChurchillDMEU.S. House1959 – 1961
Olsen, ArnoldDMTU.S. House1961 – 1973
Olson, Alec GehardDMNU.S. House1963 – 1967
Olson, PeteRTXU.S. House2009 – 2021
Olver, John W.DMAU.S. House1991 – 2013
Omar, IlhanDMNU.S. House2019 – 2025
Ortiz, Solomon P.DTXU.S. House1983 – 2011
Orton, WilliamDUTU.S. House1991 – 1997
Osborne, TomRNEU.S. House2001 – 2007
Ose, DougRCAU.S. House1999 – 2005
Osmers, Frank Charles, Jr.RNJU.S. House1952 – 1965
Ossoff, JonDGAU.S. Senate2021 – 2027
Ostertag, Harold CharlesRNYU.S. House1951 – 1965
Otter, C. L.RIDU.S. House2001 – 2007
Ottinger, Richard LawrenceDNYU.S. House1965 – 1985
Outland, George ElmerDCAU.S. House1945 – 1947
Overton, John HolmesDLAU.S. Senate1933 – 1948
Owens, BillDNYU.S. House2009 – 2015
Owens, BurgessRUTU.S. House2021 – 2025
Owens, Douglas WayneDUTU.S. House1973 – 1993
Owens, Major R.DNYU.S. House1983 – 2007
Owens, Thomas LeonardRILU.S. House1947 – 1949
Oxley, Michael G.ROHU.S. House1981 – 2007