List of former United States representatives (O)

Last updated

This is a complete list of former United States representatives whose last names begin with the letter O.

Number of years/terms representative/delegate has served

The number of years the representative/delegate has served in Congress indicates the number of terms the representative/delegate has. Note the representative/delegate can also serve non-consecutive terms if the representative/delegate loses election and wins re-election to the House.

Representative/DelegateYearsState/TerritoryPartyLifespan
Mary Rose Oakar 1977–1993OhioDemocratic1940–2025
P. Davis Oakey 1915–1917ConnecticutRepublican1861–1920
Thomas Jackson Oakley 1813–1815New YorkFederalist1783–1857
1827–1828Democratic
Charles G. Oakman 1953–1955MichiganRepublican1903–1973
William C. Oates 1881–1894AlabamaDemocratic1835–1910
Jim Oberstar 1975–2011MinnesotaDemocratic-Farmer-Labor1934–2014
Dave Obey 1969–2011WisconsinDemocratic1938–present
Charles F.X. O'Brien 1921–1925New JerseyDemocratic1879–1940
George D. O'Brien 1937–1939
1941–1947
1949–1955		MichiganDemocratic1900–1957
George M. O'Brien 1973–1986IllinoisRepublican1917–1986
James O'Brien 1879–1881New YorkIndependent Democrat1841–1907
James H. O'Brien 1913–1915New YorkDemocratic1860–1924
Jeremiah O'Brien 1823–1825MaineDemocratic-Republican1778–1858
1825–1829National Republican
Joseph J. O'Brien 1939–1945New YorkRepublican1897–1953
Leo W. O'Brien 1952–1966New YorkDemocratic1900–1982
Thomas J. O'Brien 1933–1939
1943–1964		IllinoisDemocratic1878–1964
William J. O'Brien 1873–1877MarylandDemocratic1836–1905
William S. O'Brien 1927–1929West VirginiaDemocratic1862–1948
Pablo Ocampo 1907–1909PhilippinesNone1853-1925
Thomas P. Ochiltree 1883–1885TexasIndependent1837–1902
David J. O'Connell 1919–1921
1923–1930		New YorkDemocratic1868–1930
Jeremiah E. O'Connell 1923–1927
1929–1930		Rhode IslandDemocratic1883–1964
Jerry J. O'Connell 1937–1939MontanaDemocratic1909–1956
John Matthew O'Connell 1933–1939Rhode IslandDemocratic1872–1941
Joseph F. O'Connell 1907–1911MassachusettsDemocratic1872–1942
Charles O'Connor 1929–1931OklahomaRepublican1878–1940
James O'Connor 1919–1931LouisianaDemocratic1870–1941
James F. O'Connor 1937–1945MontanaDemocratic1878–1945
John J. O'Connor 1923–1939New YorkDemocratic1885–1960
Michael P. O'Connor 1879–1881South CarolinaDemocratic1831–1881
Caroline O'Day 1935–1943New YorkDemocratic1875–1943
Benjamin Barker Odell Jr. 1895–1899New YorkRepublican1854–1926
Moses F. Odell 1861–1865New YorkDemocratic1818–1866
N. Holmes Odell 1875–1877New YorkDemocratic1828–1904
James O'Donnell 1885–1893MichiganRepublican1840–1915
Charles T. O'Ferrall 1884–1893VirginiaDemocratic1840–1905
Charles F. Ogden 1919–1923KentuckyRepublican1873–1933
David A. Ogden 1817–1819New YorkFederalist1770–1829
Henry W. Ogden 1894–1899LouisianaDemocratic1842–1905
Alexander Ogle 1817–1819PennsylvaniaDemocratic-Republican1766–1832
Andrew Jackson Ogle 1849–1851PennsylvaniaWhig1822–1852
Charles Ogle 1837–1841PennsylvaniaAnti-Masonic1798–1841
1841Whig
Woodson R. Oglesby 1913–1917New YorkDemocratic1867–1955
James M. E. O'Grady 1899–1901New YorkRepublican1863–1928
Frank T. O'Hair 1913–1915IllinoisDemocratic1870–1932
Tom O'Halleran 2017–2023ArizonaDemocratic1946–present
Barratt O'Hara 1949–1951
1953–1969		IllinoisDemocratic1882–1969
James E. O'Hara 1883–1887North CarolinaRepublican1844–1905
James G. O'Hara 1959–1977MichiganDemocratic1925–1989
Joseph P. O'Hara 1941–1959MinnesotaRepublican1895–1975
Lewis P. Ohliger 1892–1893OhioDemocratic1843–1923
Alvin O'Konski 1943–1973WisconsinRepublican1904–1987
J. Van Vechten Olcott 1905–1911New YorkRepublican1856–1940
Pearl Peden Oldfield 1929–1931ArkansasDemocratic1876–1962
William Allan Oldfield 1909–1928ArkansasDemocratic1874–1928
Edson B. Olds 1849–1855OhioDemocratic1802–1869
Denis O'Leary 1913–1914New YorkDemocratic1863–1943
James A. O'Leary 1935–1944New YorkDemocratic1889–1944
Abram B. Olin 1857–1863New YorkRepublican1808–1879
Gideon Olin 1803–1807VermontDemocratic-Republican1743–1823
Henry Olin 1824–1825VermontNational Republican1768–1837
Jim Olin 1983–1993VirginiaDemocratic1920–2006
Andrew Oliver 1853–1857New YorkDemocratic1815–1889
Daniel C. Oliver 1917–1919New YorkDemocratic1865–1924
Frank A. Oliver 1923–1934New YorkDemocratic1883–1968
James C. Oliver 1937–1943MaineRepublican1895–1986
1959–1961Democratic
Mordecai Oliver 1853–1855MissouriWhig1819–1898
1855–1857Oppositionist
S. Addison Oliver 1875–1879IowaRepublican1833–1912
William Bacon Oliver 1915–1937AlabamaDemocratic1867–1948
William M. Oliver 1841–1843New YorkDemocratic1792–1863
Marlin Edgar Olmsted 1897–1913PennsylvaniaRepublican1847–1913
Richard Olney II 1915–1921MassachusettsDemocratic1871–1939
Kathryn O'Loughlin McCarthy 1933–1935KansasDemocratic1894-1952
Archibald E. Olpp 1921–1923New JerseyRepublican1882–1949
Arnold Olsen 1961–1971MontanaDemocratic1916–1990
Alec G. Olson 1963–1967MinnesotaDemocratic-Farmer-Labor1930–present
Pete Olson 2009–2021TexasRepublican1962–present
John Olver 1991–2013MassachusettsDemocratic1936–2023
Matthew Vincent O'Malley 1931New YorkDemocratic1878–1931
Thomas O'Malley 1933–1939WisconsinDemocratic1903–1979
Emmet O'Neal 1935–1947KentuckyDemocratic1887–1967
Maston E. O'Neal Jr. 1965–1971GeorgiaDemocratic1907–1990
John H. O'Neall 1887–1891IndianaDemocratic1838–1907
Joseph H. O'Neil 1889–1895MassachusettsDemocratic1853–1935
Charles O'Neill 1863–1871
1873–1893		PennsylvaniaRepublican1821–1893
Edward L. O'Neill 1937–1939New JerseyDemocratic1903–1948
Harry P. O'Neill 1949–1953PennsylvaniaDemocratic1889–1953
John O'Neill 1863–1865OhioDemocratic1822–1905
John Joseph O'Neill 1883–1889
1891–1893
1894–1895		MissouriDemocratic1846–1898
Tip O'Neill 1953–1987MassachusettsDemocratic1912–1994
Daniel O'Reilly 1879–1881New YorkIndependent Democrat1838–1911
Stephen Ormsby 1811–1813
1813–1817		KentuckyDemocratic-Republican1759–1844
Beto O'Rourke 2013–2019TexasDemocratic1972–present
Alexander D. Orr 1792–1795KentuckyAnti-Administration1761–1835
1795–1797Democratic-Republican
Benjamin Orr 1817–1819MassachusettsFederalist1772–1828
Jackson Orr 1871–1875IowaRepublican1832–1926
James Lawrence Orr 1849–1859South CarolinaDemocratic1822–1873
Robert Orr Jr. 1825–1829PennsylvaniaDemocratic1786–1876
Godlove Stein Orth 1863–1871
1873–1875
1879–1882		IndianaRepublican1817–1882
Solomon Ortiz 1983–2011TexasDemocratic1937–present
Bill Orton 1991–1997UtahDemocratic1948–2009
Edwin Sylvanus Osborne 1885–1891PennsylvaniaRepublican1839–1900
Henry Z. Osborne 1917–1923CaliforniaRepublican1848–1923
John Eugene Osborne 1897–1899WyomingDemocratic1858–1943
Thomas Burr Osborne 1839–1843ConnecticutWhig1798–1869
Tom Osborne 2001–2007NebraskaRepublican1937–present
Doug Ose 1999–2005CaliforniaRepublican1955–present
Gayton P. Osgood 1833–1835MassachusettsDemocratic1797–1861
George F. O'Shaunessy 1911–1919Rhode IslandDemocratic1868–1934
Camilo Osías 1929–1935PhilippinesNone1889–1976
James H. Osmer 1879–1881PennsylvaniaRepublican1832–1912
Frank C. Osmers Jr. 1939–1943
1951–1965		New JerseyRepublican1907–1977
Harold C. Ostertag 1951–1965New YorkRepublican1896–1985
Eugene D. O'Sullivan 1949–1951NebraskaDemocratic1883–1968
Patrick B. O'Sullivan 1923–1925ConnecticutDemocratic1887–1978
Mariano S. Otero 1879–1881New MexicoRepublican1844-1904
Miguel Antonio Otero 1856–1861New MexicoDemocratic1829-1882
Peter J. Otey 1895–1902VirginiaDemocratic1840–1902
Harrison Gray Otis 1797–1801MassachusettsFederalist1765–1848
John Otis 1849–1851MaineWhig1801–1856
John G. Otis 1891–1893KansasPopulist1838–1916
Norton P. Otis 1903–1905New YorkRepublican1840–1905
Theobald Otjen 1895–1907WisconsinRepublican1851–1924
Donald L. O'Toole 1937–1953New YorkDemocratic1902–1964
Butch Otter 2001–2007IdahoRepublican1942–present
Richard Ottinger 1965–1971
1975–1985		New YorkDemocratic1929–present
Granville H. Oury 1881–1885ArizonaDemocratic1825-1891
Joseph H. Outhwaite 1885–1895OhioDemocratic1841–1907
George E. Outland 1943–1947CaliforniaDemocratic1906–1981
David Outlaw 1847–1853North CarolinaWhig1806–1868
George Outlaw 1825North CarolinaDemocratic-Republican1771–1825
Arthur W. Overmyer 1915–1919OhioDemocratic1879–1952
James Overstreet 1819–1822South CarolinaDemocratic-Republican1773–1822
James W. Overstreet 1906–1907
1917–1923		GeorgiaDemocratic1866–1938
Jesse Overstreet 1895–1909IndianaRepublican1859–1910
Edward Overton Jr. 1877–1881PennsylvaniaRepublican1836–1903
John H. Overton 1931–1933LouisianaDemocratic1875–1948
Walter Hampden Overton 1829–1831LouisianaDemocratic1788–1845
Allen Ferdinand Owen 1849–1851GeorgiaWhig1816–1865
Emmett Marshall Owen 1933–1939GeorgiaDemocratic1877–1939
George Washington Owen 1823–1825AlabamaDemocratic-Republican1796–1837
1825–1829Democratic
James Owen 1817–1819North CarolinaDemocratic-Republican1784–1865
Robert Dale Owen 1843–1847IndianaDemocratic1801–1877
Ruth Bryan Owen 1929–1933FloridaDemocratic1885–1954
William D. Owen 1885–1891IndianaRepublican1846–19??
Bill Owens 2009–2015New YorkDemocratic1949–present
George Welshman Owens 1835–1839GeorgiaDemocratic1786–1856
James W. Owens 1889–1893OhioDemocratic1837–1900
Major Owens 1983–2007New YorkDemocratic1936–2013
Thomas L. Owens 1947–1948IllinoisRepublican1897–1948
Wayne Owens 1973–1975
1987–1993		UtahDemocratic1937–2002
William Claiborne Owens 1895–1896KentuckyDemocratic1849–1925
1896–1897Republican
Bryan Owsley 1841–1843KentuckyWhig1798–1849
Mike Oxley 1981–2007OhioRepublican1944–2016
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