# List of United States senators from Idaho

Below is a chronological listing of the United States senators from Idaho. The state was admitted to the Union on July 3, 1890, and its U.S. senators belong to class 2 and class 3. Idaho's current U.S. Senators are Republicans Mike Crapo (serving since 1999) and Jim Risch (serving since 2009). William Borah was Idaho's longest-serving senator (1907–1940). Idaho is one of fourteen states alongside California, Colorado, Georgia, Hawaii, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Nevada, Pennsylvania, South Dakota and Utah to have a younger senior senator and an older junior senator.

## List of senators

| Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | Class 2Class 2 U.S. senators belong to the electoral cycle that has recently been contested in 2002, 2008, 2014, and 2020. The next election will be in 2026. | C | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. | Class 3Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. |
| # | Senator | Party | Dates in office | Electoral history | T | C | T | Electoral history | Dates in office | Party | Senator | # |
| Vacant | Vacant | Vacant | Jul 3, 1890 – Dec 18, 1890 | After joining the Union, Idaho did not elect its senators for six months. | 1 | 51st | 1 | After joining the Union, Idaho did not elect its senators for six months. | Jul 3, 1890 – Dec 18, 1890 | Vacant | Vacant | Vacant |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Elected in 1890. | 1 | 51st | 1 | Elected in 1890.Retired. | Dec 18, 1890 – Mar 3, 1891 | Republican | William McConnell | 1 |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Elected in 1890. | 1 | 52nd | 2 | Elected in 1890.Lost re-election as a Silver Republican. | Mar 4, 1891 – Mar 3, 1897 | Republican | Fred Dubois | 2 |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Elected in 1890. | 1 | 53rd | 2 | Elected in 1890.Lost re-election as a Silver Republican. | Mar 4, 1891 – Mar 3, 1897 | Republican | Fred Dubois | 2 |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Re-elected in 1895.Lost re-election. | 2 | 54th | 2 | Elected in 1890.Lost re-election as a Silver Republican. | Mar 4, 1891 – Mar 3, 1897 | Republican | Fred Dubois | 2 |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Re-elected in 1895.Lost re-election. | 2 | 55th | 3 | Elected in 1897.Retired. | Mar 4, 1897 – Mar 3, 1903 | Populist | Henry Heitfeld | 3 |
| 1 | George Shoup | Republican | Dec 18, 1890 – Mar 3, 1901 | Re-elected in 1895.Lost re-election. | 2 | 56th | 3 | Elected in 1897.Retired. | Mar 4, 1897 – Mar 3, 1903 | Populist | Henry Heitfeld | 3 |
| 2 | Fred Dubois | Silver Republican | Mar 4, 1901 – Mar 3, 1907 | Elected in 1901 as a Silver Republican, but changed party to Democratic.Lost re-election. | 3 | 57th | 3 | Elected in 1897.Retired. | Mar 4, 1897 – Mar 3, 1903 | Populist | Henry Heitfeld | 3 |
| 2 | Fred Dubois | Democratic | Mar 4, 1901 – Mar 3, 1907 | Elected in 1901 as a Silver Republican, but changed party to Democratic.Lost re-election. | 3 | 57th | 3 | Elected in 1897.Retired. | Mar 4, 1897 – Mar 3, 1903 | Populist | Henry Heitfeld | 3 |
| 2 | Fred Dubois | Democratic | Mar 4, 1901 – Mar 3, 1907 | Elected in 1901 as a Silver Republican, but changed party to Democratic.Lost re-election. | 3 | 58th | 4 | Elected in 1903. | Mar 4, 1903 – Oct 17, 1912 | Republican | Weldon Heyburn | 4 |
| 2 | Fred Dubois | Democratic | Mar 4, 1901 – Mar 3, 1907 | Elected in 1901 as a Silver Republican, but changed party to Democratic.Lost re-election. | 3 | 59th | 4 | Elected in 1903. | Mar 4, 1903 – Oct 17, 1912 | Republican | Weldon Heyburn | 4 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 60th | 4 | Elected in 1903. | Mar 4, 1903 – Oct 17, 1912 | Republican | Weldon Heyburn | 4 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 61st | 5 | Re-elected in 1909.Died. | Mar 4, 1903 – Oct 17, 1912 | Republican | Weldon Heyburn | 4 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 62nd | 5 | Re-elected in 1909.Died. | Mar 4, 1903 – Oct 17, 1912 | Republican | Weldon Heyburn | 4 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 62nd | 5 | | Oct 17, 1912 – Nov 18, 1912 | Vacant | Vacant | Vacant |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 62nd | 5 | Appointed to continue Heyburn's term.Lost election to finish Heyburn's term. | Nov 18, 1912 – Feb 6, 1913 | Democratic | Kirtland Perky | 5 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Elected in 1907. | 4 | 62nd | 5 | Elected in 1913 to finish Heyburn's term. | Feb 6, 1913 – Jan 13, 1918 | Republican | James Brady | 6 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1913. | 5 | 63rd | 5 | Elected in 1913 to finish Heyburn's term. | Feb 6, 1913 – Jan 13, 1918 | Republican | James Brady | 6 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1913. | 5 | 64th | 6 | Re-elected in 1914.Died. | Feb 6, 1913 – Jan 13, 1918 | Republican | James Brady | 6 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1913. | 5 | 65th | 6 | Re-elected in 1914.Died. | Feb 6, 1913 – Jan 13, 1918 | Republican | James Brady | 6 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1913. | 5 | 65th | 6 | | Jan 13, 1918 – Jan 22, 1918 | Vacant | Vacant | Vacant |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1913. | 5 | 65th | 6 | Appointed to continue Brady's term.Elected in 1918 to finish Brady's term.Resigned to become a Federal Trade Commissioner, having lost election to a full term. | Jan 22, 1918 – Jan 14, 1921 | Democratic | John F. Nugent | 7 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1918 | 6 | 66th | 6 | Appointed to continue Brady's term.Elected in 1918 to finish Brady's term.Resigned to become a Federal Trade Commissioner, having lost election to a full term. | Jan 22, 1918 – Jan 14, 1921 | Democratic | John F. Nugent | 7 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1918 | 6 | 66th | 6 | Appointed to finish Brady's term, having been elected to the next term. | Jan 15, 1921 – Jun 24, 1928 | Republican | Frank Gooding | 8 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1918 | 6 | 67th | 7 | Elected to full term in 1920. | Jan 15, 1921 – Jun 24, 1928 | Republican | Frank Gooding | 8 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1918 | 6 | 68th | 7 | Elected to full term in 1920. | Jan 15, 1921 – Jun 24, 1928 | Republican | Frank Gooding | 8 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1924. | 7 | 69th | 7 | Elected to full term in 1920. | Jan 15, 1921 – Jun 24, 1928 | Republican | Frank Gooding | 8 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1924. | 7 | 70th | 8 | Re-elected in 1926.Died. | Jan 15, 1921 – Jun 24, 1928 | Republican | Frank Gooding | 8 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1924. | 7 | 70th | 8 | | Jun 24, 1928 – Jun 30, 1928 | Vacant | Vacant | Vacant |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1924. | 7 | 70th | 8 | Appointed to continue Gooding's term.Elected in 1928 to finish Gooding's term.Lost re-election. | Jun 30, 1928 – Mar 3, 1933 | Republican | John Thomas | 9 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1924. | 7 | 71st | 8 | Appointed to continue Gooding's term.Elected in 1928 to finish Gooding's term.Lost re-election. | Jun 30, 1928 – Mar 3, 1933 | Republican | John Thomas | 9 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1930. | 8 | 72nd | 8 | Appointed to continue Gooding's term.Elected in 1928 to finish Gooding's term.Lost re-election. | Jun 30, 1928 – Mar 3, 1933 | Republican | John Thomas | 9 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1930. | 8 | 73rd | 9 | Elected in 1932.Lost renomination. | Mar 4, 1933 – Jan 3, 1939 | Democratic | James P. Pope | 10 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1930. | 8 | 74th | 9 | Elected in 1932.Lost renomination. | Mar 4, 1933 – Jan 3, 1939 | Democratic | James P. Pope | 10 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1936.Died. | 9 | 75th | 9 | Elected in 1932.Lost renomination. | Mar 4, 1933 – Jan 3, 1939 | Democratic | James P. Pope | 10 |
| 3 | William Borah | Republican | Mar 4, 1907 – Jan 19, 1940 | Re-elected in 1936.Died. | 9 | 76th | 10 | Elected in 1938.Lost renomination. | Jan 3, 1939 – Jan 3, 1945 | Democratic | D. Worth Clark | 11 |
| Vacant | Vacant | Vacant | Jan 19, 1940 – Jan 27, 1940 | | 9 | 76th | 10 | Elected in 1938.Lost renomination. | Jan 3, 1939 – Jan 3, 1945 | Democratic | D. Worth Clark | 11 |
| 4 | John Thomas | Republican | Jan 27, 1940 – Nov 10, 1945 | Appointed to continue Borah's term.Elected in 1940 to finish Borah's term. | 9 | 76th | 10 | Elected in 1938.Lost renomination. | Jan 3, 1939 – Jan 3, 1945 | Democratic | D. Worth Clark | 11 |
| 4 | John Thomas | Republican | Jan 27, 1940 – Nov 10, 1945 | Appointed to continue Borah's term.Elected in 1940 to finish Borah's term. | 9 | 77th | 10 | Elected in 1938.Lost renomination. | Jan 3, 1939 – Jan 3, 1945 | Democratic | D. Worth Clark | 11 |
| 4 | John Thomas | Republican | Jan 27, 1940 – Nov 10, 1945 | Re-elected in 1942.Died. | 10 | 78th | 10 | Elected in 1938.Lost renomination. | Jan 3, 1939 – Jan 3, 1945 | Democratic | D. Worth Clark | 11 |
| 4 | John Thomas | Republican | Jan 27, 1940 – Nov 10, 1945 | Re-elected in 1942.Died. | 10 | 79th | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| Vacant | Vacant | Vacant | Nov 10, 1945 – Nov 17, 1945 | | 10 | 79th | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 5 | Charles C. Gossett | Democratic | Nov 17, 1945 – Nov 5, 1946 | Appointed to continue Thomas's term.Lost nomination to finish Thomas's term. | 10 | 79th | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 6 | Henry Dworshak | Republican | Nov 6, 1946 – Jan 3, 1949 | Elected in 1946 to finish Thomas's term.Lost re-election. | 10 | 79th | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 6 | Henry Dworshak | Republican | Nov 6, 1946 – Jan 3, 1949 | Elected in 1946 to finish Thomas's term.Lost re-election. | 10 | 80th | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 7 | Bert H. Miller | Democratic | Jan 3, 1949 – Oct 8, 1949 | Elected in 1948.Died. | 11 | 81st | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| Vacant | Vacant | Vacant | Oct 8, 1949 – Oct 14, 1949 | | 11 | 81st | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Appointed to continue Miller's term.Elected in 1950 to finish Miller's term. | 11 | 81st | 11 | Elected in 1944.Lost renomination. | Jan 3, 1945 – Jan 3, 1951 | Democratic | Glen H. Taylor | 12 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Appointed to continue Miller's term.Elected in 1950 to finish Miller's term. | 11 | 82nd | 12 | Elected in 1950.Lost re-election. | Jan 3, 1951 – Jan 3, 1957 | Republican | Herman Welker | 13 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Appointed to continue Miller's term.Elected in 1950 to finish Miller's term. | 11 | 83rd | 12 | Elected in 1950.Lost re-election. | Jan 3, 1951 – Jan 3, 1957 | Republican | Herman Welker | 13 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Re-elected in 1954 | 12 | 84th | 12 | Elected in 1950.Lost re-election. | Jan 3, 1951 – Jan 3, 1957 | Republican | Herman Welker | 13 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Re-elected in 1954 | 12 | 85th | 13 | Elected in 1956. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Re-elected in 1954 | 12 | 86th | 13 | Elected in 1956. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 8 | Henry Dworshak | Republican | Oct 14, 1949 – Jul 23, 1962 | Re-elected in 1960.Died. | 13 | 87th | 13 | Elected in 1956. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| Vacant | Vacant | Vacant | Jul 23, 1962 – Aug 6, 1962 | | 13 | 87th | 13 | Elected in 1956. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Appointed to continue Dworshak's term.Elected in 1962 to finish Dworshak's term. | 13 | 87th | 13 | Elected in 1956. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Appointed to continue Dworshak's term.Elected in 1962 to finish Dworshak's term. | 13 | 88th | 14 | Re-elected in 1962. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Appointed to continue Dworshak's term.Elected in 1962 to finish Dworshak's term. | 13 | 89th | 14 | Re-elected in 1962. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Re-elected in 1966.Retired. | 14 | 90th | 14 | Re-elected in 1962. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Re-elected in 1966.Retired. | 14 | 91st | 15 | Re-elected in 1968. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 9 | Len Jordan | Republican | Aug 6, 1962 – Jan 3, 1973 | Re-elected in 1966.Retired. | 14 | 92nd | 15 | Re-elected in 1968. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Elected in 1972. | 15 | 93rd | 15 | Re-elected in 1968. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Elected in 1972. | 15 | 94th | 16 | Re-elected in 1974.Lost re-election. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Elected in 1972. | 15 | 95th | 16 | Re-elected in 1974.Lost re-election. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1978. | 16 | 96th | 16 | Re-elected in 1974.Lost re-election. | Jan 3, 1957 – Jan 3, 1981 | Democratic | Frank Church | 14 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1978. | 16 | 97th | 17 | Elected in 1980. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1978. | 16 | 98th | 17 | Elected in 1980. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1984.Retired. | 17 | 99th | 17 | Elected in 1980. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1984.Retired. | 17 | 100th | 18 | Re-elected in 1986.Retired. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 10 | Jim McClure | Republican | Jan 3, 1973 – Jan 3, 1991 | Re-elected in 1984.Retired. | 17 | 101st | 18 | Re-elected in 1986.Retired. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Elected in 1990. | 18 | 102nd | 18 | Re-elected in 1986.Retired. | Jan 3, 1981 – Jan 3, 1993 | Republican | Steve Symms | 15 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Elected in 1990. | 18 | 103rd | 19 | Elected in 1992.Retired to run for Governor of Idaho. | Jan 3, 1993 – Jan 3, 1999 | Republican | Dirk Kempthorne | 16 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Elected in 1990. | 18 | 104th | 19 | Elected in 1992.Retired to run for Governor of Idaho. | Jan 3, 1993 – Jan 3, 1999 | Republican | Dirk Kempthorne | 16 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 1996. | 19 | 105th | 19 | Elected in 1992.Retired to run for Governor of Idaho. | Jan 3, 1993 – Jan 3, 1999 | Republican | Dirk Kempthorne | 16 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 1996. | 19 | 106th | 20 | Elected in 1998. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 1996. | 19 | 107th | 20 | Elected in 1998. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 2002.Retired. | 20 | 108th | 20 | Elected in 1998. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 2002.Retired. | 20 | 109th | 21 | Re-elected in 2004. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 11 | Larry Craig | Republican | Jan 3, 1991 – Jan 3, 2009 | Re-elected in 2002.Retired. | 20 | 110th | 21 | Re-elected in 2004. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Elected in 2008. | 21 | 111th | 21 | Re-elected in 2004. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Elected in 2008. | 21 | 112th | 22 | Re-elected in 2010. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Elected in 2008. | 21 | 113th | 22 | Re-elected in 2010. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2014. | 22 | 114th | 22 | Re-elected in 2010. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2014. | 22 | 115th | 23 | Re-elected in 2016. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2014. | 22 | 116th | 23 | Re-elected in 2016. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2020. | 23 | 117th | 23 | Re-elected in 2016. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2020. | 23 | 118th | 24 | Re-elected in 2022. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| 12 | Jim Risch | Republican | Jan 3, 2009 – present | Re-elected in 2020. | 23 | 119th | 24 | Re-elected in 2022. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | 24 | 120th | 24 | Re-elected in 2022. | Jan 3, 1999 – present | Republican | Mike Crapo | 17 |
| To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | To be determined in the 2026 election. | 24 | 121st | 25 | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. | To be determined in the 2028 election. |
| # | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
| Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | C | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 | Class 3 |