# List of United States senators from Wyoming

Wyoming was admitted to the Union on July 10, 1890, and elects United States senators to class 1 and class 2. Its current U.S. senators are Republicans John Barrasso (serving since 2007) and Cynthia Lummis (serving since 2021). 21 people have served as a United States senator from Wyoming. Francis E. Warren was Wyoming's longest serving senator (served 1890–1893; 1895–1929).

## List of senators

| Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | Class 1Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2008 (special election), 2012, 2018, and 2024. The next election will be in 2030. | C | 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. |
| # | Senator | Party | Dates in office | Electoral history | T | C | T | Electoral history | Dates in office | Party | Senator | # |
| Vacant | Vacant | Vacant | Jul 10, 1890 – Nov 18, 1890 | After joining the Union, Wyoming did not elect its senators for four months. | 1 | 51st | 1 | After joining the Union, Wyoming did not elect its senators for four months. | Jul 10, 1890 – Nov 15, 1890 | Vacant | Vacant | Vacant |
| 1 | Francis E. Warren | Republican | Nov 18, 1890 – Mar 3, 1893 | Elected in 1890.Lost re-election. | 1 | 51st | 1 | Elected in 1890.Lost re-election. | Nov 15, 1890 – Mar 3, 1895 | Republican | Joseph M. Carey | 1 |
| 1 | Francis E. Warren | Republican | Nov 18, 1890 – Mar 3, 1893 | Elected in 1890.Lost re-election. | 1 | 52nd | 1 | Elected in 1890.Lost re-election. | Nov 15, 1890 – Mar 3, 1895 | Republican | Joseph M. Carey | 1 |
| Vacant | Vacant | Vacant | Mar 4, 1893 – Jan 23, 1895 | | 2 | 53rd | 1 | Elected in 1890.Lost re-election. | Nov 15, 1890 – Mar 3, 1895 | Republican | Joseph M. Carey | 1 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Elected to finish vacant term. | 2 | 53rd | 1 | Elected in 1890.Lost re-election. | Nov 15, 1890 – Mar 3, 1895 | Republican | Joseph M. Carey | 1 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Elected to finish vacant term. | 2 | 54th | 2 | Elected in 1895. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Elected to finish vacant term. | 2 | 55th | 2 | Elected in 1895. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1899. | 3 | 56th | 2 | Elected in 1895. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1899. | 3 | 57th | 3 | Re-elected in 1901. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1899. | 3 | 58th | 3 | Re-elected in 1901. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1905. | 4 | 59th | 3 | Re-elected in 1901. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1905. | 4 | 60th | 4 | Re-elected in 1907. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1905. | 4 | 61st | 4 | Re-elected in 1907. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1911.Lost re-election. | 5 | 62nd | 4 | Re-elected in 1907. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1911.Lost re-election. | 5 | 63rd | 5 | Re-elected in 1913. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 2 | Clarence D. Clark | Republican | Jan 23, 1895 – Mar 3, 1917 | Re-elected in 1911.Lost re-election. | 5 | 64th | 5 | Re-elected in 1913. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Elected in 1916. | 6 | 65th | 5 | Re-elected in 1913. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Elected in 1916. | 6 | 66th | 6 | Re-elected in 1918. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Elected in 1916. | 6 | 67th | 6 | Re-elected in 1918. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1922. | 7 | 68th | 6 | Re-elected in 1918. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1922. | 7 | 69th | 7 | Re-elected in 1924.Died. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1922. | 7 | 70th | 7 | Re-elected in 1924.Died. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 71st | 7 | Re-elected in 1924.Died. | Mar 4, 1895 – Nov 24, 1929 | Republican | Francis E. Warren | 2 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 71st | 7 | | Nov 24, 1929 – Dec 5, 1929 | Vacant | Vacant | Vacant |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 71st | 7 | Appointed to continue Warren's term.Retired when successor elected. | Dec 5, 1929 – Nov 20, 1930 | Republican | Patrick J. Sullivan | 3 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 71st | 7 | | Nov 20, 1930 – Dec 1, 1930 | Vacant | Vacant | Vacant |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 71st | 7 | Elected to finish Warren's term. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 72nd | 8 | Elected to full term in 1930.Lost re-election. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| 3 | John B. Kendrick | Democratic | Mar 4, 1917 – Nov 3, 1933 | Re-elected in 1928.Died. | 8 | 73rd | 8 | Elected to full term in 1930.Lost re-election. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| Vacant | Vacant | Vacant | Nov 3, 1933 – Dec 18, 1933 | | 8 | 73rd | 8 | Elected to full term in 1930.Lost re-election. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Appointed to continue Kendrick's term.Elected in 1934 to finish Kendrick's term. | 8 | 73rd | 8 | Elected to full term in 1930.Lost re-election. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Elected in 1934. | 9 | 74th | 8 | Elected to full term in 1930.Lost re-election. | Dec 1, 1930 – Jan 3, 1937 | Republican | Robert D. Carey | 4 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Elected in 1934. | 9 | 75th | 9 | Elected in 1936.Lost re-election. | Jan 3, 1937 – Jan 3, 1943 | Democratic | Harry Schwartz | 5 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Elected in 1934. | 9 | 76th | 9 | Elected in 1936.Lost re-election. | Jan 3, 1937 – Jan 3, 1943 | Democratic | Harry Schwartz | 5 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1940. | 10 | 77th | 9 | Elected in 1936.Lost re-election. | Jan 3, 1937 – Jan 3, 1943 | Democratic | Harry Schwartz | 5 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1940. | 10 | 78th | 10 | Elected in 1942.Lost re-election. | Jan 3, 1943 – Jan 3, 1949 | Republican | Edward V. Robertson | 6 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1940. | 10 | 79th | 10 | Elected in 1942.Lost re-election. | Jan 3, 1943 – Jan 3, 1949 | Republican | Edward V. Robertson | 6 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1946.Lost re-election. | 11 | 80th | 10 | Elected in 1942.Lost re-election. | Jan 3, 1943 – Jan 3, 1949 | Republican | Edward V. Robertson | 6 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1946.Lost re-election. | 11 | 81st | 11 | Elected in 1948.Died. | Jan 3, 1949 – Jun 19, 1954 | Democratic | Lester C. Hunt | 7 |
| 4 | Joseph C. O'Mahoney | Democratic | Dec 18, 1933 – Jan 3, 1953 | Re-elected in 1946.Lost re-election. | 11 | 82nd | 11 | Elected in 1948.Died. | Jan 3, 1949 – Jun 19, 1954 | Democratic | Lester C. Hunt | 7 |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 83rd | 11 | Elected in 1948.Died. | Jan 3, 1949 – Jun 19, 1954 | Democratic | Lester C. Hunt | 7 |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 83rd | 11 | | Jun 19, 1954 – Jun 24, 1954 | Vacant | Vacant | Vacant |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 83rd | 11 | Appointed to continue Hunt's term.Retired when successor elected. | Jun 24, 1954 – Nov 28, 1954 | Republican | Edward D. Crippa | 8 |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 83rd | 11 | Elected in 1954 to finish Hunt's term. | Nov 29, 1954 – Jan 3, 1961 | Democratic | Joseph C. O'Mahoney | 9 |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 84th | 12 | Elected to full term in 1954.Retired. | Nov 29, 1954 – Jan 3, 1961 | Democratic | Joseph C. O'Mahoney | 9 |
| 5 | Frank A. Barrett | Republican | Jan 3, 1953 – Jan 3, 1959 | Elected in 1952.Lost re-election. | 12 | 85th | 12 | Elected to full term in 1954.Retired. | Nov 29, 1954 – Jan 3, 1961 | Democratic | Joseph C. O'Mahoney | 9 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Elected in 1958. | 13 | 86th | 12 | Elected to full term in 1954.Retired. | Nov 29, 1954 – Jan 3, 1961 | Democratic | Joseph C. O'Mahoney | 9 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Elected in 1958. | 13 | 87th | 13 | Appointed to begin the term of Keith Thomson (R), who was elected in 1960 but died before the Congress began.Lost election to finish Thomson's term. | Jan 3, 1961 – Nov 6, 1962 | Democratic | Joe Hickey | 10 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Elected in 1958. | 13 | 87th | 13 | Elected to finish Thomson's term.Retired. | Nov 7, 1962 – Jan 3, 1967 | Republican | Milward Simpson | 11 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Elected in 1958. | 13 | 88th | 13 | Elected to finish Thomson's term.Retired. | Nov 7, 1962 – Jan 3, 1967 | Republican | Milward Simpson | 11 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1964. | 14 | 89th | 13 | Elected to finish Thomson's term.Retired. | Nov 7, 1962 – Jan 3, 1967 | Republican | Milward Simpson | 11 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1964. | 14 | 90th | 14 | Elected in 1966. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1964. | 14 | 91st | 14 | Elected in 1966. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1970.Lost re-election. | 15 | 92nd | 14 | Elected in 1966. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1970.Lost re-election. | 15 | 93rd | 15 | Re-elected in 1972.Retired and resigned early to give successor preferential seniority. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 6 | Gale W. McGee | Democratic | Jan 3, 1959 – Jan 3, 1977 | Re-elected in 1970.Lost re-election. | 15 | 94th | 15 | Re-elected in 1972.Retired and resigned early to give successor preferential seniority. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Elected in 1976. | 16 | 95th | 15 | Re-elected in 1972.Retired and resigned early to give successor preferential seniority. | Jan 3, 1967 – Dec 31, 1978 | Republican | Clifford Hansen | 12 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Elected in 1976. | 16 | 95th | 15 | Appointed to finish Hansen's term, having already been elected to the next term. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Elected in 1976. | 16 | 96th | 16 | Elected in 1978. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Elected in 1976. | 16 | 97th | 16 | Elected in 1978. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1982. | 17 | 98th | 16 | Elected in 1978. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1982. | 17 | 99th | 17 | Re-elected in 1984. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1982. | 17 | 100th | 17 | Re-elected in 1984. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1988.Retired. | 18 | 101st | 17 | Re-elected in 1984. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1988.Retired. | 18 | 102nd | 18 | Re-elected in 1990.Retired. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 7 | Malcolm Wallop | Republican | Jan 3, 1977 – Jan 3, 1995 | Re-elected in 1988.Retired. | 18 | 103rd | 18 | Re-elected in 1990.Retired. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Elected in 1994. | 19 | 104th | 18 | Re-elected in 1990.Retired. | Jan 1, 1979 – Jan 3, 1997 | Republican | Alan Simpson | 13 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Elected in 1994. | 19 | 105th | 19 | Elected in 1996. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Elected in 1994. | 19 | 106th | 19 | Elected in 1996. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Re-elected in 2000. | 20 | 107th | 19 | Elected in 1996. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Re-elected in 2000. | 20 | 108th | 20 | Re-elected in 2002. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Re-elected in 2000. | 20 | 109th | 20 | Re-elected in 2002. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 8 | Craig Thomas | Republican | Jan 3, 1995 – Jun 4, 2007 | Re-elected in 2006.Died. | 21 | 110th | 20 | Re-elected in 2002. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| Vacant | Vacant | Vacant | Jun 4, 2007 – Jun 22, 2007 | | 21 | 110th | 20 | Re-elected in 2002. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Appointed to continue Thomas's term.Elected in 2008 to finish Thomas's term. | 21 | 110th | 20 | Re-elected in 2002. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Appointed to continue Thomas's term.Elected in 2008 to finish Thomas's term. | 21 | 111th | 21 | Re-elected in 2008. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Appointed to continue Thomas's term.Elected in 2008 to finish Thomas's term. | 21 | 112th | 21 | Re-elected in 2008. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2012. | 22 | 113th | 21 | Re-elected in 2008. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2012. | 22 | 114th | 22 | Re-elected in 2014.Retired. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2012. | 22 | 115th | 22 | Re-elected in 2014.Retired. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2018. | 23 | 116th | 22 | Re-elected in 2014.Retired. | Jan 3, 1997 – Jan 3, 2021 | Republican | Mike Enzi | 14 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2018. | 23 | 117th | 23 | Elected in 2020. | Jan 3, 2021 – present | Republican | Cynthia Lummis | 15 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2018. | 23 | 118th | 23 | Elected in 2020. | Jan 3, 2021 – present | Republican | Cynthia Lummis | 15 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2024. | 24 | 119th | 23 | Elected in 2020. | Jan 3, 2021 – present | Republican | Cynthia Lummis | 15 |
| 9 | John Barrasso | Republican | Jun 22, 2007 – present | Re-elected in 2024. | 24 | 120th | 24 | 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. |
| # | Senator | Party | Years in office | Electoral history | T | C | T | Electoral history | Years in office | Party | Senator | # |
| Class 1 | Class 1 | Class 1 | Class 1 | Class 1 | Class 1 | C | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 | Class 2 |