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Past officeholders — O
166 people whose surname begins with O and whose last term has ended in the record. Anybody still serving is on Who holds office.
- Aaron OgdenU.S. Senator · New JerseyParty: Federalistlast term ended 1803
- Abram OlinU.S. Representative · New York's 13th districtParty: Republicanlast term ended 1863
- Alec OlsonU.S. Representative · Minnesota's 6th districtParty: Democraticlast term ended 1967
- Alexander OgleU.S. Representative · Pennsylvania's 8th districtParty: Republicanlast term ended 1819
- Alexander OrrU.S. Representative · Kentucky's 2nd districtParty: Republicanlast term ended 1797
- Allen OwenU.S. Representative · Georgia's 3rd districtParty: Whiglast term ended 1851
- Alvin O’KonskiU.S. Representative · Wisconsin's 10th districtParty: Republicanlast term ended 1973
- Andrew OgleU.S. Representative · Pennsylvania's 18th districtParty: Whiglast term ended 1851
- Andrew OliverU.S. Representative · New York's 26th districtParty: Democraticlast term ended 1857
- Archibald OlppU.S. Representative · New Jersey's 11th districtParty: Republicanlast term ended 1923
- Arnold OlsenU.S. Representative · Montana's 1st districtParty: Democraticlast term ended 1971
- Arthur OvermyerU.S. Representative · Ohio's 13th districtParty: Democraticlast term ended 1919
- Barack ObamaU.S. Senator · IllinoisParty: Democraticlast term ended 2008
- Barratt O’HaraU.S. Representative · Illinois's 2nd districtParty: Democraticlast term ended 1969
- Benjamin OdellU.S. Representative · New York's 17th districtParty: Republicanlast term ended 1899
- Benjamin OrrU.S. Representative · Massachusetts's 16th districtParty: Federalistlast term ended 1819
- Beto O’RourkeU.S. Representative · Texas's 16th districtParty: Democraticlast term ended 2019
- Bryan OwsleyU.S. Representative · Kentucky's 4th districtParty: Whiglast term ended 1843
- C.L. OtterU.S. Representative · Idaho's 1st districtParty: Republicanlast term ended 2007
- Camilo OsiasU.S. Representative · PIParty: not on filelast term ended 1935
- Caroline O’DayU.S. Representative · New YorkParty: Democraticlast term ended 1943
- Charles OakmanU.S. Representative · Michigan's 17th districtParty: Republicanlast term ended 1955
- Charles OgdenU.S. Representative · Kentucky's 5th districtParty: Republicanlast term ended 1923
- Charles OgleU.S. Representative · Pennsylvania's 18th districtParty: Whiglast term ended 1843
- Charles O’BrienU.S. Representative · New Jersey's 12th districtParty: Democraticlast term ended 1925
- Charles O’ConnorU.S. Representative · Oklahoma's 1st districtParty: Republicanlast term ended 1931
- Charles O’FerrallU.S. Representative · Virginia's 7th districtParty: Democraticlast term ended 1895
- Charles O’NeillU.S. Representative · Pennsylvania's 2nd districtParty: Republicanlast term ended 1895
- Daniel OliverU.S. Representative · New York's 23rd districtParty: Democraticlast term ended 1919
- Daniel O’ReillyU.S. Representative · New York's 2nd districtParty: Ind. Democratlast term ended 1881
- David ObeyU.S. Representative · Wisconsin's 7th districtParty: Democraticlast term ended 2011
- David OgdenU.S. Representative · New York's 18th districtParty: Federalistlast term ended 1819
- David OutlawU.S. Representative · North Carolina's 9th districtParty: Whiglast term ended 1853
- David O’ConnellU.S. Representative · New York's 9th districtParty: Democraticlast term ended 1931
- Denis O’LearyU.S. Representative · New York's 2nd districtParty: Democraticlast term ended 1915
- Donald O’TooleU.S. Representative · New York's 13th districtParty: Democraticlast term ended 1953
- Doug OseU.S. Representative · California's 3rd districtParty: Republicanlast term ended 2005
- Douglas OwensU.S. Representative · Utah's 2nd districtParty: Democraticlast term ended 1993
- Edson OldsU.S. Representative · Ohio's 12th districtParty: Democraticlast term ended 1855
- Edward OvertonU.S. Representative · Pennsylvania's 15th districtParty: Republicanlast term ended 1881
- Edward O’NeillU.S. Representative · New Jersey's 11th districtParty: Democraticlast term ended 1939
- Edwin OsborneU.S. Representative · Pennsylvania's 12th districtParty: Republicanlast term ended 1891
- Emmet O’NealU.S. Representative · Kentucky's 3rd districtParty: Democraticlast term ended 1947
- Emmett OwenU.S. Representative · Georgia's 4th districtParty: Democraticlast term ended 1941
- Eugene O’SullivanU.S. Representative · Nebraska's 2nd districtParty: Democraticlast term ended 1951
- Frank OliverU.S. Representative · New York's 23rd districtParty: Democraticlast term ended 1935
- Frank OsmersU.S. Representative · New Jersey's 9th districtParty: Republicanlast term ended 1965
- Frank O’HairU.S. Representative · Illinois's 18th districtParty: Democraticlast term ended 1915
- Gayton OsgoodU.S. Representative · Massachusetts's 3rd districtParty: Jacksonlast term ended 1835
- George OliverU.S. Senator · PennsylvaniaParty: Republicanlast term ended 1917
- George OutlandU.S. Representative · California's 11th districtParty: Democraticlast term ended 1947
- George OutlawU.S. Representative · North Carolina's 2nd districtParty: not on filelast term ended 1825
- George OwenU.S. Representative · Alabama's 3rd districtParty: Jacksonlast term ended 1829
- George OwensU.S. Representative · GeorgiaParty: Democraticlast term ended 1839
- George O’BrienU.S. Representative · Michigan's 13th districtParty: Democraticlast term ended 1955
- George O’BrienU.S. Representative · Illinois's 4th districtParty: Republicanlast term ended 1987
- George O’ShaunessyU.S. Representative · Rhode Island's 1st districtParty: Democraticlast term ended 1919
- Gideon OlinU.S. Representative · Vermont's 1st districtParty: Republicanlast term ended 1807
- Godlove OrthU.S. Representative · Indiana's 9th districtParty: Republicanlast term ended 1883
- Granville OuryU.S. Representative · ArizonaParty: Democraticlast term ended 1885
- Harold OstertagU.S. Representative · New York's 37th districtParty: Republicanlast term ended 1965
- Harrison OtisU.S. Senator · MassachusettsParty: Federalistlast term ended 1823
- Harry O’NeillU.S. Representative · Pennsylvania's 10th districtParty: Democraticlast term ended 1953
- Henry OgdenU.S. Representative · Louisiana's 4th districtParty: Democraticlast term ended 1899
- Henry OlinU.S. Representative · Vermont's 3rd districtParty: not on filelast term ended 1825
- Henry OsborneU.S. Representative · CaliforniaParty: Republicanlast term ended 1925
- Herbert O’ConorU.S. Senator · MarylandParty: Democraticlast term ended 1953
- Jackson OrrU.S. Representative · Iowa's 9th districtParty: Republicanlast term ended 1875
- Jacob OlcottU.S. Representative · New York's 15th districtParty: Republicanlast term ended 1911
- James OberstarU.S. Representative · Minnesota's 8th districtParty: Democraticlast term ended 2011
- James OlinU.S. Representative · Virginia's 6th districtParty: Democraticlast term ended 1993
- James OliverU.S. Representative · Maine's 1st districtParty: Democraticlast term ended 1961
- James OrrU.S. Representative · South Carolina's 5th districtParty: Democraticlast term ended 1859
- James OsmerU.S. Representative · Pennsylvania's 27th districtParty: Republicanlast term ended 1881
- James OverstreetU.S. Representative · South Carolina's 4th districtParty: Republicanlast term ended 1823
- James OverstreetU.S. Representative · Georgia's 1st districtParty: Democraticlast term ended 1923
- James OwenU.S. Representative · North Carolina's 5th districtParty: Republicanlast term ended 1819
- James OwensU.S. Representative · Ohio's 14th districtParty: Democraticlast term ended 1893
- James O’BrienU.S. Representative · New York's 10th districtParty: Ind. Democratlast term ended 1881
- James O’BrienU.S. Representative · New York's 9th districtParty: Democraticlast term ended 1915
- James O’ConnorU.S. Representative · Louisiana's 1st districtParty: Democraticlast term ended 1931
- James O’ConnorU.S. Representative · Montana's 2nd districtParty: Democraticlast term ended 1947
- James O’DonnellU.S. Representative · Michigan's 3rd districtParty: Republicanlast term ended 1893
- James O’GormanU.S. Senator · New YorkParty: Democraticlast term ended 1917
- James O’GradyU.S. Representative · New York's 31st districtParty: Republicanlast term ended 1901
- James O’HaraU.S. Representative · North Carolina's 2nd districtParty: Republicanlast term ended 1887
- James O’HaraU.S. Representative · Michigan's 12th districtParty: Democraticlast term ended 1977
- James O’LearyU.S. Representative · New York's 11th districtParty: Democraticlast term ended 1945
- Jeremiah O’BrienU.S. Representative · Maine's 6th districtParty: Adamslast term ended 1829
- Jeremiah O’ConnellU.S. Representative · Rhode Island's 3rd districtParty: Democraticlast term ended 1931
- Jerry O’ConnellU.S. Representative · Montana's 1st districtParty: Democraticlast term ended 1939
- Jesse OverstreetU.S. Representative · Indiana's 7th districtParty: Republicanlast term ended 1909
- John OsborneU.S. Representative · WyomingParty: Democraticlast term ended 1899
- John OtisU.S. Representative · Maine's 3rd districtParty: Whiglast term ended 1851
- John OtisU.S. Representative · Kansas's 4th districtParty: Populistlast term ended 1893
- John OvertonU.S. Senator · LouisianaParty: Democraticlast term ended 1948
- John O’ConnellU.S. Representative · Rhode Island's 2nd districtParty: Democraticlast term ended 1939
- John O’ConnorU.S. Representative · New York's 16th districtParty: Democraticlast term ended 1939
- John O’NeallU.S. Representative · Indiana's 2nd districtParty: Democraticlast term ended 1891
- John O’NeillU.S. Representative · Ohio's 13th districtParty: Democraticlast term ended 1865
- John O’NeillU.S. Representative · Missouri's 11th districtParty: Democraticlast term ended 1895
- John W. OlverU.S. Representative · Massachusetts's 1st districtParty: Democraticlast term ended 2013
- Joseph OuthwaiteU.S. Representative · Ohio's 12th districtParty: Democraticlast term ended 1895
- Joseph O’BrienU.S. Representative · New York's 38th districtParty: Republicanlast term ended 1945
- Joseph O’ConnellU.S. Representative · Massachusetts's 10th districtParty: Democraticlast term ended 1911
- Joseph O’HaraU.S. Representative · Minnesota's 2nd districtParty: Republicanlast term ended 1959
- Joseph O’MahoneyU.S. Senator · WyomingParty: Democraticlast term ended 1961
- Joseph O’NeilU.S. Representative · Massachusetts's 9th districtParty: Democraticlast term ended 1895
- Lee OvermanU.S. Senator · North CarolinaParty: Democraticlast term ended 1930
- Leo O’BrienU.S. Representative · New York's 29th districtParty: Democraticlast term ended 1967
- Lewis OhligerU.S. Representative · Ohio's 16th districtParty: Democraticlast term ended 1893
- Major OwensU.S. Representative · New York's 11th districtParty: Democraticlast term ended 2007
- Mariano OteroU.S. Representative · New MexicoParty: Republicanlast term ended 1881
- Marlin OlmstedU.S. Representative · Pennsylvania's 18th districtParty: Republicanlast term ended 1913
- Mary OakarU.S. Representative · Ohio's 20th districtParty: Democraticlast term ended 1993
- Maston O’NealU.S. Representative · Georgia's 2nd districtParty: Democraticlast term ended 1971
- Michael OxleyU.S. Representative · Ohio's 4th districtParty: Republicanlast term ended 2007
- Michael O’ConnorU.S. Representative · South Carolina's 2nd districtParty: Democraticlast term ended 1883
- Miguel OteroU.S. Representative · New MexicoParty: Democraticlast term ended 1861
- Mordecai OliverU.S. Representative · Missouri's 4th districtParty: Ind. Republican-Democratlast term ended 1857
- Moses OdellU.S. Representative · New York's 3rd districtParty: Democraticlast term ended 1865
- Nathaniel OdellU.S. Representative · New York's 12th districtParty: Democraticlast term ended 1877
- Norton OtisU.S. Representative · New York's 19th districtParty: Republicanlast term ended 1905
- Pablo OcampoU.S. Representative · PIParty: not on filelast term ended 1911
- Patrick O’SullivanU.S. Representative · Connecticut's 5th districtParty: Democraticlast term ended 1925
- Pearl OldfieldU.S. Representative · Arkansas's 2nd districtParty: Democraticlast term ended 1931
- Pete OlsonU.S. Representative · Texas's 22nd districtParty: Republicanlast term ended 2021
- Peter OakeyU.S. Representative · Connecticut's 1st districtParty: Republicanlast term ended 1917
- Peter OteyU.S. Representative · Virginia's 6th districtParty: Democraticlast term ended 1902
- Richard OglesbyU.S. Senator · IllinoisParty: Republicanlast term ended 1879
- Richard OlneyU.S. Representative · Massachusetts's 14th districtParty: Democraticlast term ended 1921
- Richard OttingerU.S. Representative · New York's 20th districtParty: Democraticlast term ended 1985
- Robert OrrU.S. Representative · Pennsylvania's 16th districtParty: Jacksonlast term ended 1829
- Robert OwenU.S. Representative · Indiana's 1st districtParty: Democraticlast term ended 1847
- Robert OwenU.S. Senator · OklahomaParty: Democraticlast term ended 1925
- Ruth OwenU.S. Representative · Florida's 4th districtParty: Democraticlast term ended 1933
- Samuel OliverU.S. Representative · Iowa's 9th districtParty: Republicanlast term ended 1879
- Simeon OlcottU.S. Senator · New HampshireParty: Federalistlast term ended 1805
- Solomon OrtizU.S. Representative · Texas's 27th districtParty: Democraticlast term ended 2011
- Stephen OrmsbyU.S. Representative · Kentucky's 8th districtParty: Republicanlast term ended 1817
- Tasker OddieU.S. Senator · NevadaParty: Republicanlast term ended 1933
- Theobald OtjenU.S. Representative · Wisconsin's 4th districtParty: Republicanlast term ended 1907
- Thomas OakleyU.S. Representative · New York's 5th districtParty: Jacksonlast term ended 1829
- Thomas OchiltreeU.S. Representative · Texas's 7th districtParty: Independentlast term ended 1885
- Thomas OsbornU.S. Senator · FloridaParty: Republicanlast term ended 1873
- Thomas OsborneU.S. Representative · Connecticut's 4th districtParty: Whiglast term ended 1843
- Thomas OsborneU.S. Representative · Nebraska's 3rd districtParty: Republicanlast term ended 2007
- Thomas OwensU.S. Representative · Illinois's 7th districtParty: Republicanlast term ended 1949
- Thomas O’BrienU.S. Representative · Illinois's 6th districtParty: Democraticlast term ended 1965
- Thomas O’MalleyU.S. Representative · Wisconsin's 5th districtParty: Democraticlast term ended 1939
- Thomas O’NeillU.S. Representative · Massachusetts's 8th districtParty: Democraticlast term ended 1987
- Tom O’HalleranU.S. Representative · Arizona's 1st districtParty: Democraticlast term ended 2023
- Walter OvertonU.S. Representative · Louisiana's 3rd districtParty: Jacksonlast term ended 1831
- Wilbert O’DanielU.S. Senator · TexasParty: Democraticlast term ended 1949
- William L. OwensU.S. Representative · New York's 21st districtParty: Democraticlast term ended 2015
- William OatesU.S. Representative · Alabama's 3rd districtParty: Democraticlast term ended 1895
- William OldfieldU.S. Representative · Arkansas's 2nd districtParty: Democraticlast term ended 1929
- William OliverU.S. Representative · New York's 27th districtParty: Democraticlast term ended 1843
- William OliverU.S. Representative · Alabama's 6th districtParty: Democraticlast term ended 1937
- William OrtonU.S. Representative · Utah's 3rd districtParty: Democraticlast term ended 1997
- William OwenU.S. Representative · Indiana's 10th districtParty: Republicanlast term ended 1891
- William OwensU.S. Representative · Kentucky's 7th districtParty: Democraticlast term ended 1897
- William O’BrienU.S. Representative · Maryland's 3rd districtParty: Democraticlast term ended 1877
- William O’BrienU.S. Representative · West Virginia's 3rd districtParty: Democraticlast term ended 1929
- William St. OngeU.S. Representative · Connecticut's 2nd districtParty: Democraticlast term ended 1971
- Woodson OglesbyU.S. Representative · New York's 24th districtParty: Democraticlast term ended 1917