| Member/Delegate |
Years |
Party |
District |
Notes |
| LeRoy H. Anderson |
January 3, 1957 – January 3, 1961 |
Democratic |
2nd |
Elected in 1956. Re-elected in 1958. Retired to run for U.S. senator. |
| Roy E. Ayers |
March 4, 1933 – January 3, 1937 |
Democratic |
2nd |
Elected in 1932. Re-elected in 1934. Retired to run for Governor of Montana. |
| James F. Battin |
January 3, 1961 – February 27, 1969 |
Republican |
2nd |
Elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Resigned to become judge of the U.S. District Court of Montana. |
| Max Baucus |
January 3, 1975 – December 14, 1978 |
Democratic |
1st |
Elected in 1974. Re-elected in 1976. Retired to run for U.S. senator and resigned when appointed to that seat. |
| Albert J. Campbell |
March 4, 1899 – March 3, 1901 |
Democratic |
At-large |
Elected in 1898. Retired. |
| Thomas Henry Carter |
March 4, 1889 – November 8, 1889 |
Republican |
Territory |
Elected in 1888. Position eliminated upon statehood. |
| November 8, 1889 – March 3, 1891 |
At-large |
Elected in 1889. Lost re-election to W.W. Dixon. |
| James M. Cavanaugh |
March 4, 1867 – March 3, 1871 |
Democratic |
Territory |
Elected in 1866. Re-elected in 1868. Lost renomination to Edwin W. Toole. |
| William H. Clagett |
March 4, 1871 – March 3, 1873 |
Republican |
Territory |
Elected in 1871. Lost re-election to Maginnis. |
| Wesley A. D'Ewart |
June 5, 1945 – January 3, 1955 |
Republican |
2nd |
Elected to finish O'Connor's term. Re-elected in 1946. Re-elected in 1948. Re-elected in 1950. Re-elected in 1952. Retired to run for U.S. senator. |
| Steve Daines |
January 3, 2013 – January 3, 2015 |
Republican |
At-large |
Elected in 2012. Retired to successfully run for U.S. Senate. |
| Joseph M. Dixon |
March 4, 1903 – March 3, 1907 |
Republican |
At-large |
Elected in 1902. Re-elected in 1904. Retired to run for U.S. Senate. |
| William W. Dixon |
March 4, 1891 – March 3, 1893 |
Democratic |
At-large |
Elected in 1890. Lost re-election to Hartman. |
| Troy Downing |
January 3, 2025 – present |
Republican |
2nd |
Elected in 2024. Incumbent. |
| Caldwell Edwards |
March 4, 1901 – March 3, 1903 |
Populist |
At-large |
Elected in 1900. Retired. |
| John M. Evans |
March 4, 1913 – March 3, 1919 |
Democratic |
At-large |
Elected in 1912. Re-elected in 1914. Re-elected in 1916. Redistricted to the 1st district. |
| March 4, 1919 – March 3, 1921 |
1st |
Redistricted from the at-large district and re-elected in 1918. Lost re-election to McCormick. |
| March 4, 1923 – March 3, 1933 |
Elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Lost renomination to Monaghan. |
| Orvin B. Fjare |
January 3, 1955 – January 3, 1957 |
Republican |
2nd |
Elected in 1954. Lost re-election to Anderson. |
| Greg Gianforte |
May 25, 2017 – January 3, 2021 |
Republican |
At-large |
Elected to finish Zinke's term. Re-elected in 2018. Retired to successfully run for Governor of Montana. |
| Charles S. Hartman |
March 4, 1893 – March 3, 1897 |
Republican |
At-large |
Elected in 1892. Re-elected in 1894. |
| March 4, 1897 – March 3, 1899 |
Silver Republican |
Re-elected in 1896 as a Silver Republican. Retired. |
| Rick Hill |
January 3, 1997 – January 3, 2001 |
Republican |
At-large |
Elected in 1996. Re-elected in 1998. Retired. |
| Scott Leavitt |
March 4, 1923 – March 3, 1933 |
Republican |
2nd |
Elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Lost re-election to Ayers. |
| Martin Maginnis |
March 4, 1873 – March 3, 1885 |
Democratic |
Territory |
Elected in 1872. Re-elected in 1874. Re-elected in 1876. Re-elected in 1878. Re-elected in 1880. Re-elected in 1882. Retired. |
| Mike Mansfield |
January 3, 1943 – January 3, 1953 |
Democratic |
1st |
Elected in 1942. Re-elected in 1944. Re-elected in 1946. Re-elected in 1948. Re-elected in 1950. Retired to run for U.S. senator. |
| Ron Marlenee |
January 3, 1977 – January 3, 1993 |
Republican |
2nd |
Elected in 1976. Re-elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the at-large district and lost re-election to Williams. |
| Washington J. McCormick |
March 4, 1921 – March 3, 1923 |
Republican |
1st |
Elected in 1920. Lost re-election to Evans. |
| Samuel McLean |
January 6, 1865 – March 3, 1867 |
Democratic |
Territory |
Elected in 1864. Re-elected in 1865. Retired. |
| John Melcher |
June 24, 1969 – January 3, 1977 |
Democratic |
2nd |
Elected to finish Battin's term. Re-elected in 1970. Re-elected in 1972. Re-elected in 1974. Retired to run for U.S. senator. |
| Lee Metcalf |
January 3, 1953 – January 3, 1961 |
Democratic |
1st |
Elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Retired to run for U.S. senator. |
| Joseph P. Monaghan |
March 4, 1933 – January 3, 1937 |
Democratic |
1st |
Elected in 1932. Re-elected in 1934. Retired to run for U.S. senator. |
| Jerry J. O'Connell |
January 3, 1937 – January 3, 1939 |
Democratic |
1st |
Elected in 1936. Lost re-election to Thorkelson. |
| James F. O'Connor |
January 3, 1937 – January 15, 1945 |
Democratic |
2nd |
Elected in 1936. Re-elected in 1938. Re-elected in 1940. Re-elected in 1942. Re-elected in 1944. Died. |
| Arnold Olsen |
January 3, 1961 – January 3, 1971 |
Democratic |
1st |
Elected in 1960. Re-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Lost re-election to Shoup. |
| Charles Nelson Pray |
March 4, 1907 – March 3, 1913 |
Republican |
At-large |
Elected in 1906. Re-elected in 1908. Re-elected in 1910. Lost re-election to Evans. |
| Jeannette Rankin |
March 4, 1917 – March 3, 1919 |
Republican |
At-large |
Elected in 1916. Retired to run for U.S. Senator. |
| January 3, 1941 – January 3, 1943 |
1st |
Elected in 1940. Retired. |
| Denny Rehberg |
January 3, 2001 – January 3, 2013 |
Republican |
At-large |
Elected in 2000. Re-elected in 2002. Re-elected in 2004. Re-elected in 2006. Re-elected in 2008. Re-elected in 2010. Retired to run for U.S. Senator. |
| Carl W. Riddick |
March 4, 1919 – March 3, 1923 |
Republican |
2nd |
Elected in 1918. Re-elected in 1920. Retired to run for U.S. senator. |
| Matt Rosendale |
January 3, 2021 – January 3, 2023 |
Republican |
At-large |
Elected in 2020. Redistricted to the 2nd district. |
| January 3, 2023 – January 3, 2025 |
2nd |
Redistricted from the at-large district and re-elected in 2022. Retired. |
| Richard G. Shoup |
January 3, 1971 – January 3, 1975 |
Republican |
1st |
Elected in 1970. Re-elected in 1972. Lost re-election to Baucus. |
| Tom Stout |
March 4, 1913 – March 3, 1917 |
Democratic |
At-large |
Elected in 1912. Re-elected in 1914. Retired. |
| Jacob Thorkelson |
January 3, 1939 – January 3, 1941 |
Republican |
1st |
Elected in 1938. Lost renomination to Rankin. |
| Joseph Toole |
March 4, 1885 – March 3, 1889 |
Democratic |
Territory |
Elected in 1884. Re-elected in 1886. Retired. |
| Pat Williams |
January 3, 1979 – January 3, 1993 |
Democratic |
1st |
Elected in 1978. Re-elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Re-elected in 1990. Redistricted to the at-large seat. |
| January 3, 1993 – January 3, 1997 |
At-large |
Redistricted from the 1st district. and Re-elected in 1992. Re-elected in 1994. Retired. |
| Ryan Zinke |
January 3, 2015 – March 1, 2017 |
Republican |
At-large |
Elected in 2014. Re-elected in 2016. Resigned to become U.S. Secretary of the Interior. |
| January 3, 2023 – present |
1st |
Elected in 2022. Incumbent. |