Oregon was admitted to the Union on February 14, 1859. Its current U.S. senators are Democrats Ron Wyden (serving since 1996) and Jeff Merkley (serving since 2009). Wyden is Oregon's longest-serving senator.
Before 1906, U.S. senators were elected by the Oregon Legislative Assembly. In 1904, Oregon voters passed a ballot measure that required U.S. senators to be selected by a popular vote and then endorsed by the state legislature. Beginning in 1914, U.S. senators were directly elected by popular vote based on the 17th Amendment to the United States Constitution.
|- style="height:2em" ! 1 | align=left | <br/>Delazon Smith | | Democratic | nowrap | Feb 14, 1859 âÂÂ<br/>Mar 3, 1859 | Elected in 1859.Lost re-election. | 1 | | rowspan=3 | 1 | rowspan=3 | Elected in 1859.Retired. | rowspan=3 nowrap | Feb 14, 1859 âÂÂ<br/>Mar 3, 1861 | rowspan=3 | Democratic | rowspan=3 align=right | <br/>Joseph Lane ! rowspan=3 | 1
|- style="height:2em" | colspan=3 | Vacant | nowrap | Mar 3, 1859 âÂÂ<br/>Oct 1, 1860 | Legislature failed to elect. | rowspan=7 | 2 | rowspan=2
|- style="height:2em" ! rowspan=2 | 2 | rowspan=2 align=left | <br/>Edward D. Baker | rowspan=2 | Republican | rowspan=2 nowrap | Oct 1, 1860 âÂÂ<br/>Oct 21, 1861 | rowspan=2 | Elected late in 1860.Died.
|- style="height:2em" | rowspan=4 | rowspan=6 | 2 | rowspan=6 | Election year unknown.Lost re-election. | rowspan=6 nowrap | Mar 4, 1861 âÂÂ<br/>Mar 3, 1867 | rowspan=6 | Democratic | rowspan=6 align=right | <br/>James Nesmith ! rowspan=6 | 2
|- style="height:2em" | colspan=3 | Vacant | nowrap | Oct 21, 1861 âÂÂ<br/>Feb 27, 1862 |
|- style="height:2em" ! 3 | align=left | <br/>Benjamin Stark | | Democratic | nowrap | Feb 27, 1862 âÂÂ<br/> Sep 12, 1862 | Appointed to continue Baker's term.Retired when successor elected.
|- style="height:2em" ! rowspan=2 | 4 | rowspan=2 align=left | <br/>Benjamin F. Harding | rowspan=2 | Union | rowspan=2 nowrap | Sep 12, 1862 âÂÂ<br/>Mar 3, 1865 | rowspan=2 | Elected to finish Baker's term.Retired.
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 5 | rowspan=3 align=left | <br/>George H. Williams | rowspan=3 | Republican | rowspan=3 nowrap | Mar 4, 1865 âÂÂ<br/>Mar 3, 1871 | rowspan=3 | Elected in 1864.Lost re-election. | rowspan=3 | 3 |
|- style="height:2em" | | rowspan=3 | 3 | rowspan=3 | Election year unknown.Retired. | rowspan=3 nowrap | Mar 4, 1867 âÂÂ<br/>Mar 3, 1873 | rowspan=3 | Republican | rowspan=3 align=right | <br/>Henry W. Corbett ! rowspan=3 | 3
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 6 | rowspan=3 align=left | <br/>James K. Kelly | rowspan=3 | Democratic | rowspan=3 nowrap | Mar 4, 1871 âÂÂ<br/>Mar 3, 1877 | rowspan=3 | Elected in 1870.Retired. | rowspan=3 | 4 |
|- style="height:2em" | | rowspan=3 | 4 | rowspan=3 | Elected in 1872.Lost re-election. | rowspan=3 nowrap | Mar 4, 1873 âÂÂ<br/>Mar 3, 1879 | rowspan=3 | Republican | rowspan=3 align=right | <br/>John H. Mitchell ! rowspan=3 | 4
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 7 | rowspan=3 align=left | <br/>La Fayette Grover | rowspan=3 | Democratic | rowspan=3 nowrap | Mar 4, 1877 âÂÂ<br/>Mar 3, 1883 | rowspan=3 | Election year unknown.Retired. | rowspan=3 | 5 |
|- style="height:2em" | | rowspan=3 | 5 | rowspan=3 | Election year unknown.Retired. | rowspan=3 nowrap | Mar 4, 1879 âÂÂ<br/>Mar 3, 1885 | rowspan=3 | Democratic | rowspan=3 align=right | <br/>James H. Slater ! rowspan=3 | 5
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|- style="height:2em" ! rowspan=7 | 8 | rowspan=7 align=left | <br/>Joseph N. Dolph | rowspan=7 | Republican | rowspan=7 nowrap | Mar 4, 1883 âÂÂ<br/>Mar 3, 1895 | rowspan=4 | Elected in 1882. | rowspan=4 | 6 |
|- style="height:2em" | rowspan=2 | rowspan=4 | 6 | | nowrap | Mar 3, 1885 âÂÂ<br/>Nov 18, 1885 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected late in 1885. | rowspan=6 nowrap | Nov 18, 1885 âÂÂ<br/>Mar 3, 1897 | rowspan=6 | Republican | rowspan=6 align=right | <br/>John H. Mitchell ! rowspan=6 | 6
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1888.Lost re-election. | rowspan=3 | 7 |
|- style="height:2em" | | rowspan=3 | 7 | rowspan=3 | Re-elected in 1890.Lost re-election.
|- style="height:2em" |
|- style="height:2em" ! rowspan=4 | 9 | rowspan=4 align=left | <br/>George W. McBride | rowspan=4 | Republican | rowspan=4 nowrap | Mar 4, 1895 âÂÂ<br/>Mar 3, 1901 | rowspan=4 | Elected in 1895.Lost renomination. | rowspan=4 | 8 |
|- style="height:2em" | rowspan=2 | rowspan=4 | 8 | | nowrap | Mar 3, 1897 âÂÂ<br/>Oct 7, 1898 | colspan=3 | Vacant
|- style="height:2em" | rowspan=3 | Elected late in 1898.Retired. | rowspan=3 nowrap | Oct 7, 1898 âÂÂ<br/>Mar 3, 1903 | rowspan=3 | Republican | rowspan=3 align=right | <br/>Joseph Simon ! rowspan=3 | 7
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 10 | rowspan=3 align=left | <br/>John H. Mitchell | rowspan=3 | Republican | rowspan=3 nowrap | Mar 4, 1901 âÂÂ<br/>Dec 8, 1905 | rowspan=3 | Elected in 1901.Died. | rowspan=6 | 9 |
|- style="height:2em" | | rowspan=6 | 9 | rowspan=6 | Elected in 1903.Lost re-election. | rowspan=6 nowrap | Mar 4, 1903 âÂÂ<br/>Mar 3, 1909 | rowspan=6 | Republican | rowspan=6 align=right | <br/>Charles W. Fulton ! rowspan=6 | 8
|- style="height:2em" | rowspan=4
|- style="height:2em" | colspan=3 | Vacant | nowrap | Dec 8, 1905 âÂÂ<br/>Dec 21, 1905 |
|- style="height:2em" ! 11 | align=left | <br/>John M. Gearin | | Democratic | nowrap | Dec 21, 1905 âÂÂ<br/>Jan 23, 1907 | Appointed to continue Mitchell's term.Retired when successor elected.
|- style="height:2em" ! 12 | align=left | <br/>Frederick W. Mulkey | | Republican | nowrap | Jan 23, 1907 âÂÂ<br/>Mar 3, 1907 | Elected to finish Mitchell's term.Retired.
|- style="height:2em" ! rowspan=3 | 13 | rowspan=3 align=left | <br/>Jonathan Bourne Jr. | rowspan=3 | Republican | rowspan=3 nowrap | Mar 4, 1907 âÂÂ<br/>Mar 3, 1913 | rowspan=3 | Elected in 1907.Lost renomination. | rowspan=3 | 10 |
|- style="height:2em" | | rowspan=3 | 10 | rowspan=3 | Elected in 1909. | rowspan=10 nowrap | Mar 4, 1909 âÂÂ<br/>Mar 3, 1921 | rowspan=10 | Democratic | rowspan=10 align=right | <br/>George E. Chamberlain ! rowspan=10 | 9
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 14 | rowspan=3 align=left | <br/>Harry Lane | rowspan=3 | Democratic | rowspan=3 nowrap | Mar 4, 1913 âÂÂ<br/>May 23, 1917 | rowspan=3 | Elected in 1913.Died. | rowspan=7 | 11 |
|- style="height:2em" | | rowspan=7 | 11 | rowspan=7 | Re-elected in 1914.Lost re-election.
|- style="height:2em" | rowspan=5
|- style="height:2em" | colspan=3 | Vacant | nowrap | May 23, 1917 âÂÂ<br/>May 29, 1917 |
|- style="height:2em" ! 15 | align=left | <br/>Charles L. McNary | | Republican | nowrap | May 29, 1917 âÂÂ<br/>Nov 5, 1918 | Appointed to continue Lane's term.Not elected to finish Lane's term.
|- style="height:2em" ! 16 | align=left | <br/>Frederick W. Mulkey | | Republican | nowrap | Nov 6, 1918 âÂÂ<br/>Dec 17, 1918 | Elected to finish Lane's term.Resigned early to give successor preferential seniority.
|- style="height:2em" ! rowspan=17 | 17 | rowspan=17 align=left | <br/>Charles L. McNary | rowspan=17 | Republican | rowspan=17 nowrap | Dec 18, 1918 âÂÂ<br/>Feb 25, 1944 | Appointed to finish Lane's term, having already been elected to the next term.
|- style="height:2em" | rowspan=3 | Elected in 1918. | rowspan=3 | 12 |
|- style="height:2em" | | rowspan=3 | 12 | rowspan=3 | Elected in 1920.Lost re-election. | rowspan=3 nowrap | Mar 4, 1921 âÂÂ<br/>Mar 3, 1927 | rowspan=3 | Republican | rowspan=3 align=right | <br/>Robert N. Stanfield ! rowspan=3 | 10
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1924. | rowspan=3 | 13 |
|- style="height:2em" | | rowspan=3 | 13 | rowspan=3 | Elected in 1926. | rowspan=6 nowrap | Mar 4, 1927 âÂÂ<br/>Jan 31, 1938 | rowspan=6 | Republican | rowspan=6 align=right | <br/>Frederick Steiwer ! rowspan=6 | 11
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1930. | rowspan=3 | 14 |
|- style="height:2em" | | rowspan=6 | 14 | rowspan=3 | Re-elected in 1932.Resigned.
|- style="height:2em" |
|- style="height:2em" | rowspan=6 | Re-elected in 1936. | rowspan=6 | 15 | rowspan=4
|- style="height:2em" | | nowrap | Jan 31, 1938 âÂÂ<br/>Feb 1, 1938 | colspan=3 | Vacant
|- style="height:2em" | Appointed to continue Steiwer's term.Retired when successor elected. | nowrap | Feb 1, 1938 âÂÂ<br/>Nov 8, 1938 | | Democratic | align=right | <br/>Alfred Reames ! 12
|- style="height:2em" | Elected to finish Steiwer's term.Retired. | nowrap | Nov 9, 1938 âÂÂ<br/>Jan 3, 1939 | | Republican | align=right | <br/>Alexander Barry ! 13
|- style="height:2em" | | rowspan=5 | 15 | rowspan=5 | Elected in 1938.Lost renomination. | rowspan=5 nowrap | Jan 3, 1939 âÂÂ<br/>Jan 3, 1945 | rowspan=5 | Republican | rowspan=5 align=right | <br/>Rufus C. Holman ! rowspan=5 | 14
|- style="height:2em" |
|- style="height:2em" | Re-elected in 1942.Died. | rowspan=5 | 16 | rowspan=3
|- style="height:2em" | colspan=3 | Vacant | nowrap | Feb 25, 1944 âÂÂ<br/>Mar 13, 1944 |
|- style="height:2em" ! rowspan=7 | 18 | rowspan=7 align=left | <br/>Guy Cordon | rowspan=7 | Republican | rowspan=7 nowrap | Mar 13, 1944 âÂÂ<br/>Jan 3, 1955 | rowspan=3 | Appointed to continue McNary's term.Elected in 1944 to finish McNary's term.
|- style="height:2em" | | rowspan=3 | 16 | rowspan=3 | Elected in 1944. | rowspan=17 nowrap | Jan 3, 1945 âÂÂ<br/>Jan 3, 1969 | rowspan=4 | Republican | rowspan=17 align=right | <br/>Wayne Morse ! rowspan=17 | 15
|- style="height:2em" |
|- style="height:2em" | rowspan=4 | Re-elected in 1948.Lost re-election. | rowspan=4 | 17 |
|- style="height:2em" | rowspan=2 | rowspan=4 | 17 | rowspan=4 | Re-elected in 1950.
|- style="height:2em" | rowspan=2 | Independent
|- style="height:2em" |
|- style="height:2em" ! rowspan=3 | 19 | rowspan=3 align=left | <br/>Richard L. Neuberger | rowspan=3 | Democratic | rowspan=3 nowrap | Jan 3, 1955 âÂÂ<br/>Mar 9, 1960 | rowspan=3 | Elected in 1954.Died. | rowspan=6 | 18 | | rowspan=11 | Democratic
|- style="height:2em" | | rowspan=6 | 18 | rowspan=6 | Re-elected in 1956.
|- style="height:2em" | rowspan=4
|- style="height:2em" | colspan=3 | Vacant | nowrap | Mar 9, 1960 âÂÂ<br/>Mar 23, 1960 |
|- style="height:2em" ! 20 | align=left | <br/>Hall S. Lusk | | Democratic | nowrap | Mar 23, 1960 âÂÂ<br/>Nov 9, 1960 | Appointed to continue Neuberger's term.Retired when successor elected.
|- style="height:2em" ! rowspan=4 | 21 | rowspan=4 align=left | <br/>Maurine Neuberger | rowspan=4 | Democratic | rowspan=4 nowrap | Nov 9, 1960 âÂÂ<br/>Jan 3, 1967 | Elected to finish her husband's term.
|- style="height:2em" | rowspan=3 | Elected to full term in 1960.Retired. | rowspan=3 | 19 |
|- style="height:2em" | | rowspan=4 | 19 | rowspan=4 | Re-elected in 1962.Lost re-election.
|- style="height:2em" |
|- style="height:2em" | colspan=3 | Vacant | nowrap | Jan 3, 1967 âÂÂ<br/>Jan 10, 1967 | | rowspan=4 | 20 | rowspan=2
|- style="height:2em" ! rowspan=17 | 22 | rowspan=17 align=left | <br/>Mark Hatfield | rowspan=17 | Republican | rowspan=17 nowrap | Jan 10, 1967 âÂÂ<br/>Jan 3, 1997 | rowspan=3 | Elected in 1966.Seated late in order to finish his term as Governor of Oregon.
|- style="height:2em" | | rowspan=3 | 20 | rowspan=3 | Elected in 1968. | rowspan=14 nowrap | Jan 3, 1969 âÂÂ<br/>Oct 1, 1995 | rowspan=14 | Republican | rowspan=14 align=right | <br/>Bob Packwood ! rowspan=14 | 16
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1972. | rowspan=3 | 21 |
|- style="height:2em" | | rowspan=3 | 21 | rowspan=3 | Re-elected in 1974.
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1978. | rowspan=3 | 22 |
|- style="height:2em" | | rowspan=3 | 22 | rowspan=3 | Re-elected in 1980.
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 1984. | rowspan=3 | 23 |
|- style="height:2em" | | rowspan=3 | 23 | rowspan=3 | Re-elected in 1986.
|- style="height:2em" |
|- style="height:2em" | rowspan=5 | Re-elected in 1990.Retired. | rowspan=5 | 24 |
|- style="height:2em" | | rowspan=5 | 24 | rowspan=2 | Re-elected in 1992.Resigned.
|- style="height:2em" | rowspan=3
|- style="height:2em" | | nowrap | Oct 1, 1995 âÂÂ<br/>Feb 6, 1996 | colspan=3 | Vacant
|- style="height:2em" | rowspan=2 | Elected in 1996 to finish Packwood's term. | rowspan=17 nowrap | Feb 6, 1996 âÂÂ<br/>present | rowspan=17 | Democratic | rowspan=17 align=right | <br/>Ron Wyden ! rowspan=17 | 17
|- style="height:2em" ! rowspan=6 | 23 | rowspan=6 align=left | <br/>Gordon Smith | rowspan=6 | Republican | rowspan=6 nowrap | Jan 3, 1997 âÂÂ<br/>Jan 3, 2009 | rowspan=3 | Elected in 1996. | rowspan=3 | 25 |
|- style="height:2em" | | rowspan=3 | 25 | rowspan=3 | Re-elected in 1998.
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 2002.Lost re-election. | rowspan=3 | 26 |
|- style="height:2em" | | rowspan=3 | 26 | rowspan=3 | Re-elected in 2004.
|- style="height:2em" |
|- style="height:2em" ! rowspan=9 | 24 | rowspan=9 align=left | <br/>Jeff Merkley | rowspan=9 | Democratic | rowspan=9 nowrap | Jan 3, 2009 âÂÂ<br/>present | rowspan=3 | Elected in 2008. | rowspan=3 | 27 |
|- style="height:2em" | | rowspan=3 | 27 | rowspan=3 | Re-elected in 2010.
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 2014. | rowspan=3 | 28 |
|- style="height:2em" | | rowspan=3 | 28 | rowspan=3 | Re-elected in 2016.
|- style="height:2em" |
|- style="height:2em" | rowspan=3 | Re-elected in 2020. | rowspan=3 | 29 |
|- style="height:2em" | | rowspan=3|29 | rowspan=3| Re-elected in 2022.
|- style="height:2em" |
|- style="height:2em" | rowspan=2 colspan=5 | To be determined in the 2026 election. | rowspan=2|30 |
|- style="height:2em" | | 30 | colspan=5 | To be determined in the 2028 election.