List of former United States representatives (O)

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

Number of years and terms the member 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.

2 years - 1 or 2 terms 4 years - 2 or 3 terms 6 years - 3 or 4 terms 8 years - 4 or 5 terms 10 years - 5 or 6 terms 12 years - 6 or 7 terms 14 years - 7 or 8 terms 16 years - 8 or 9 terms 18 years - 9 or 10 terms 20 years - 10 or 11 terms 22 years - 11 or 12 terms 24 years - 12 or 13 terms 26 years - 13 or 14 terms 28 years - 14 or 15 terms 30 years - 15 or 16 terms 32 years - 16 or 17 terms 34 years - 17 or 18 terms 36 years - 18 or 19 terms 38 years - 19 or 20 terms 40 years - 20 or 21 terms 42 years - 21 or 22 terms 44 years - 22 or 23 terms 46 years - 23 or 24 terms 48 years - 24 or 25 terms 50 years - 25 or 26 terms 52 years - 26 or 27 terms 54 years - 27 or 28 terms 56 years - 28 or 29 terms 58 years - 29 or 30 terms

NameTermState/TerritoryPartyLifespanMary Rose Oakar1977–1993OhioDemocratic1940–2025P. Davis Oakey1915–1917ConnecticutRepublican1861–1920Thomas Jackson Oakley1813–1815New YorkFederalist1783–18571827–1828DemocraticCharles G. Oakman1953–1955MichiganRepublican1903–1973William C. Oates1881–1894AlabamaDemocratic1835–1910Jim Oberstar1975–2011MinnesotaDemocratic-Farmer-Labor1934–2014Dave Obey1969–2011WisconsinDemocratic1938–presentCharles F.X. O'Brien1921–1925New JerseyDemocratic1879–1940George D. O'Brien1937–19391941–19471949–1955MichiganDemocratic1900–1957George M. O'Brien1973–1986IllinoisRepublican1917–1986James O'Brien1879–1881New YorkIndependent Democrat1841–1907James H. O'Brien1913–1915New YorkDemocratic1860–1924Jeremiah O'Brien1823–1825MaineDemocratic-Republican1778–18581825–1829National RepublicanJoseph J. O'Brien1939–1945New YorkRepublican1897–1953Leo W. O'Brien1952–1966New YorkDemocratic1900–1982Thomas J. O'Brien1933–19391943–1964IllinoisDemocratic1878–1964William J. O'Brien1873–1877MarylandDemocratic1836–1905William S. O'Brien1927–1929West VirginiaDemocratic1862–1948Pablo Ocampo1907–1909PhilippinesNone1853-1925Thomas P. Ochiltree1883–1885TexasIndependent1837–1902David J. O'Connell1919–19211923–1930New YorkDemocratic1868–1930Jeremiah E. O'Connell1923–19271929–1930Rhode IslandDemocratic1883–1964Jerry J. O'Connell1937–1939MontanaDemocratic1909–1956John Matthew O'Connell1933–1939Rhode IslandDemocratic1872–1941Joseph F. O'Connell1907–1911MassachusettsDemocratic1872–1942Charles O'Connor1929–1931OklahomaRepublican1878–1940James O'Connor1919–1931LouisianaDemocratic1870–1941James F. O'Connor1937–1945MontanaDemocratic1878–1945John J. O'Connor1923–1939New YorkDemocratic1885–1960Michael P. O'Connor1879–1881South CarolinaDemocratic1831–1881Caroline O'Day1935–1943New YorkDemocratic1875–1943Benjamin Barker Odell Jr.1895–1899New YorkRepublican1854–1926Moses F. Odell1861–1865New YorkDemocratic1818–1866N. Holmes Odell1875–1877New YorkDemocratic1828–1904James O'Donnell1885–1893MichiganRepublican1840–1915Charles T. O'Ferrall1884–1893VirginiaDemocratic1840–1905Charles F. Ogden1919–1923KentuckyRepublican1873–1933David A. Ogden1817–1819New YorkFederalist1770–1829Henry W. Ogden1894–1899LouisianaDemocratic1842–1905Alexander Ogle1817–1819PennsylvaniaDemocratic-Republican1766–1832Andrew Jackson Ogle1849–1851PennsylvaniaWhig1822–1852Charles Ogle1837–1841PennsylvaniaAnti-Masonic1798–18411841WhigWoodson R. Oglesby1913–1917New YorkDemocratic1867–1955James M. E. O'Grady1899–1901New YorkRepublican1863–1928Frank T. O'Hair1913–1915IllinoisDemocratic1870–1932Tom O'Halleran2017–2023ArizonaDemocratic1946–presentBarratt O'Hara1949–19511953–1969IllinoisDemocratic1882–1969James E. O'Hara1883–1887North CarolinaRepublican1844–1905James G. O'Hara1959–1977MichiganDemocratic1925–1989Joseph P. O'Hara1941–1959MinnesotaRepublican1895–1975Lewis P. Ohliger1892–1893OhioDemocratic1843–1923Alvin O'Konski1943–1973WisconsinRepublican1904–1987J. Van Vechten Olcott1905–1911New YorkRepublican1856–1940Pearl Peden Oldfield1929–1931ArkansasDemocratic1876–1962William Allan Oldfield1909–1928ArkansasDemocratic1874–1928Edson B. Olds1849–1855OhioDemocratic1802–1869Denis O'Leary1913–1914New YorkDemocratic1863–1943James A. O'Leary1935–1944New YorkDemocratic1889–1944Abram B. Olin1857–1863New YorkRepublican1808–1879Gideon Olin1803–1807VermontDemocratic-Republican1743–1823Henry Olin1824–1825VermontNational Republican1768–1837Jim Olin1983–1993VirginiaDemocratic1920–2006Andrew Oliver1853–1857New YorkDemocratic1815–1889Daniel C. Oliver1917–1919New YorkDemocratic1865–1924Frank A. Oliver1923–1934New YorkDemocratic1883–1968James C. Oliver1937–1943MaineRepublican1895–19861959–1961DemocraticMordecai Oliver1853–1855MissouriWhig1819–18981855–1857OppositionistS. Addison Oliver1875–1879IowaRepublican1833–1912William Bacon Oliver1915–1937AlabamaDemocratic1867–1948William M. Oliver1841–1843New YorkDemocratic1792–1863Marlin Edgar Olmsted1897–1913PennsylvaniaRepublican1847–1913Richard Olney II1915–1921MassachusettsDemocratic1871–1939Kathryn O'Loughlin McCarthy1933–1935KansasDemocratic1894-1952Archibald E. Olpp1921–1923New JerseyRepublican1882–1949Arnold Olsen1961–1971MontanaDemocratic1916–1990Alec G. Olson1963–1967MinnesotaDemocratic-Farmer-Labor1930–presentPete Olson2009–2021TexasRepublican1962–presentJohn Olver1991–2013MassachusettsDemocratic1936–2023Matthew Vincent O'Malley1931New YorkDemocratic1878–1931Thomas O'Malley1933–1939WisconsinDemocratic1903–1979Emmet O'Neal1935–1947KentuckyDemocratic1887–1967Maston E. O'Neal Jr.1965–1971GeorgiaDemocratic1907–1990John H. O'Neall1887–1891IndianaDemocratic1838–1907Joseph H. O'Neil1889–1895MassachusettsDemocratic1853–1935Charles O'Neill1863–18711873–1893PennsylvaniaRepublican1821–1893Edward L. O'Neill1937–1939New JerseyDemocratic1903–1948Harry P. O'Neill1949–1953PennsylvaniaDemocratic1889–1953John O'Neill1863–1865OhioDemocratic1822–1905John Joseph O'Neill1883–18891891–18931894–1895MissouriDemocratic1846–1898Tip O'Neill1953–1987MassachusettsDemocratic1912–1994Daniel O'Reilly1879–1881New YorkIndependent Democrat1838–1911Stephen Ormsby1811–18131813–1817KentuckyDemocratic-Republican1759–1844Beto O'Rourke2013–2019TexasDemocratic1972–presentAlexander D. Orr1792–1795KentuckyAnti-Administration1761–18351795–1797Democratic-RepublicanBenjamin Orr1817–1819MassachusettsFederalist1772–1828Jackson Orr1871–1875IowaRepublican1832–1926James Lawrence Orr1849–1859South CarolinaDemocratic1822–1873Robert Orr Jr.1825–1829PennsylvaniaDemocratic1786–1876Godlove Stein Orth1863–18711873–18751879–1882IndianaRepublican1817–1882Solomon Ortiz1983–2011TexasDemocratic1937–presentBill Orton1991–1997UtahDemocratic1948–2009Edwin Sylvanus Osborne1885–1891PennsylvaniaRepublican1839–1900Henry Z. Osborne1917–1923CaliforniaRepublican1848–1923John Eugene Osborne1897–1899WyomingDemocratic1858–1943Thomas Burr Osborne1839–1843ConnecticutWhig1798–1869Tom Osborne2001–2007NebraskaRepublican1937–presentDoug Ose1999–2005CaliforniaRepublican1955–presentGayton P. Osgood1833–1835MassachusettsDemocratic1797–1861George F. O'Shaunessy1911–1919Rhode IslandDemocratic1868–1934Camilo Osías1929–1935PhilippinesNone1889–1976James H. Osmer1879–1881PennsylvaniaRepublican1832–1912Frank C. Osmers Jr.1939–19431951–1965New JerseyRepublican1907–1977Harold C. Ostertag1951–1965New YorkRepublican1896–1985Eugene D. O'Sullivan1949–1951NebraskaDemocratic1883–1968Patrick B. O'Sullivan1923–1925ConnecticutDemocratic1887–1978Mariano S. Otero1879–1881New MexicoRepublican1844-1904Miguel Antonio Otero1856–1861New MexicoDemocratic1829-1882Peter J. Otey1895–1902VirginiaDemocratic1840–1902Harrison Gray Otis1797–1801MassachusettsFederalist1765–1848John Otis1849–1851MaineWhig1801–1856John G. Otis1891–1893KansasPopulist1838–1916Norton P. Otis1903–1905New YorkRepublican1840–1905Theobald Otjen1895–1907WisconsinRepublican1851–1924Donald L. O'Toole1937–1953New YorkDemocratic1902–1964Butch Otter2001–2007IdahoRepublican1942–presentRichard Ottinger1965–19711975–1985New YorkDemocratic1929–2026Granville H. Oury1881–1885ArizonaDemocratic1825-1891Joseph H. Outhwaite1885–1895OhioDemocratic1841–1907George E. Outland1943–1947CaliforniaDemocratic1906–1981David Outlaw1847–1853North CarolinaWhig1806–1868George Outlaw1825North CarolinaDemocratic-Republican1771–1825Arthur W. Overmyer1915–1919OhioDemocratic1879–1952James Overstreet1819–1822South CarolinaDemocratic-Republican1773–1822James W. Overstreet1906–19071917–1923GeorgiaDemocratic1866–1938Jesse Overstreet1895–1909IndianaRepublican1859–1910Edward Overton Jr.1877–1881PennsylvaniaRepublican1836–1903John H. Overton1931–1933LouisianaDemocratic1875–1948Walter Hampden Overton1829–1831LouisianaDemocratic1788–1845Allen Ferdinand Owen1849–1851GeorgiaWhig1816–1865Emmett Marshall Owen1933–1939GeorgiaDemocratic1877–1939George Washington Owen1823–1825AlabamaDemocratic-Republican1796–18371825–1829DemocraticJames Owen1817–1819North CarolinaDemocratic-Republican1784–1865Robert Dale Owen1843–1847IndianaDemocratic1801–1877Ruth Bryan Owen1929–1933FloridaDemocratic1885–1954William D. Owen1885–1891IndianaRepublican1846–19??Bill Owens2009–2015New YorkDemocratic1949–presentGeorge Welshman Owens1835–1839GeorgiaDemocratic1786–1856James W. Owens1889–1893OhioDemocratic1837–1900Major Owens1983–2007New YorkDemocratic1936–2013Thomas L. Owens1947–1948IllinoisRepublican1897–1948Wayne Owens1973–19751987–1993UtahDemocratic1937–2002William Claiborne Owens1895–1896KentuckyDemocratic1849–19251896–1897RepublicanBryan Owsley1841–1843KentuckyWhig1798–1849Mike Oxley1981–2007OhioRepublican1944–2016

External links Congressional Biographical Directory