List of United States senators from Colorado

Colorado was admitted to the Union on August 1, 1876 and elects U.S. senators to Senate class 2 and class 3.

Both of Colorados current U.S. senators are Democrats Michael Bennet (serving since 2009) and John Hickenlooper (serving since 2021). Colorado is one of fifteen states alongside Arizona, Florida, Georgia, Hawaii, Idaho, Indiana, Louisiana, Maine, Massachusetts, Minnesota, Missouri, Nevada, South Dakota and Utah to have a younger senior senator and an older junior senator.

Henry M. Teller was Colorado's longest-serving senator (1876–1882; 1885–1909).

List of senators

 * - style="height:2em"
 * colspan=3 | Vacant
 * Aug 1, 1876 – Nov 15, 1876
 * Colorado did not elect its senators until three months after statehood.
 * rowspan=2 | 1
 * rowspan=3 | 1
 * Colorado did not elect its senators until three months after statehood.
 * Aug 1, 1876 – Nov 15, 1876
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=4 | 1 ! rowspan=2 | 1
 * - style="height:2em"
 * rowspan=4 align=left | Henry Moore Teller c. 1902.jpg Henry M. Teller
 * rowspan=4 | Republican
 * rowspan=4 nowrap | Nov 15, 1876 – Apr 17, 1882
 * Elected in 1876.
 * rowspan=2 | Elected in 1876.Retired.
 * rowspan=2 nowrap | Nov 15, 1876 – Mar 3, 1879
 * rowspan=2 | Republican
 * rowspan=2 align=right | Jerome B. Chaffee - Brady-Handy.jpg Jerome B. Chaffee


 * - style="height:2em"
 * rowspan=3 | Elected to next term in 1876 or 1877.Resigned to become U.S. Secretary of the Interior.
 * rowspan=5 | 2

! rowspan=5 | 2
 * - style="height:2em"
 * rowspan=5 | 2
 * rowspan=5 | Elected in 1879.Lost re-nomination.
 * rowspan=5 nowrap | Mar 4, 1879 – Mar 3, 1885
 * rowspan=5 | Republican
 * rowspan=5 align=right | Nathaniel P. Hill - Brady-Handy.jpg Nathaniel P. Hill
 * rowspan=5 align=right | Nathaniel P. Hill - Brady-Handy.jpg Nathaniel P. Hill


 * - style="height:2em"
 * rowspan=3

! 2
 * - style="height:2em"
 * align=left | George M. Chilcott - Brady-Handy.jpg George M. Chilcott
 * | Republican
 * nowrap | Apr 17, 1882 – Jan 27, 1883
 * Appointed to continue Teller's term.Did not run to finish the term.

! 3
 * - style="height:2em"
 * align=left | Horace Austin Warner Tabor - Brady-Handy.jpg Horace Tabor
 * | Republican
 * nowrap | Jan 27, 1883 – Mar 3, 1883
 * Elected to finish Teller's term.Retired.

! rowspan=3 | 4
 * - style="height:2em"
 * rowspan=3 align=left | ThomasMBowen.jpg Thomas M. Bowen
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1883 – Mar 3, 1889
 * rowspan=3 | Election date unknown.Unknown if retired or lost re-election.
 * rowspan=3 | 3

! rowspan=12 | 3
 * - style="height:2em"
 * rowspan=3 | 3
 * rowspan=3 | Elected in 1885.
 * rowspan=12 nowrap | Mar 4, 1885 – Mar 3, 1909
 * rowspan=6 | Republican
 * rowspan=12 align=right | Henry Moore Teller c. 1902.jpg Henry M. Teller
 * rowspan=12 align=right | Henry Moore Teller c. 1902.jpg Henry M. Teller


 * - style="height:2em"

! rowspan=6 | 5
 * - style="height:2em"
 * rowspan=6 align=left | Edward Oliver Wolcott.jpg Edward O. Wolcott
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Mar 4, 1889 – Mar 3, 1901
 * rowspan=3 | Elected in 1889.
 * rowspan=3 | 4


 * - style="height:2em"
 * rowspan=3 | 4
 * rowspan=3 | Re-elected in 1891.
 * rowspan=3 | Re-elected in 1891.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1895.Lost re-election.
 * rowspan=3 | 5


 * - style="height:2em"
 * rowspan=3 | 5
 * rowspan=3 | Re-elected in 1897.
 * rowspan=3 | Silver Republican
 * rowspan=3 | Silver Republican


 * - style="height:2em"

! rowspan=3 | 6
 * - style="height:2em"
 * rowspan=3 align=left | Thomas MacDonald patterson.jpg Thomas M. Patterson
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Mar 4, 1901 – Mar 3, 1907
 * rowspan=3 | Elected in 1901.Retired.
 * rowspan=3 | 6


 * - style="height:2em"
 * rowspan=3 | 6
 * rowspan=3 | Re-elected in 1903.Retired.
 * rowspan=3 | Democratic
 * rowspan=3 | Democratic


 * - style="height:2em"

! rowspan=5 | 7
 * - style="height:2em"
 * rowspan=5 align=left | Simon_Guggenheim_cph.3a02257.jpg Simon Guggenheim
 * rowspan=5 | Republican
 * rowspan=5 nowrap | Mar 4, 1907 – Mar 3, 1913
 * rowspan=5 | Elected in 1907.Retired.
 * rowspan=5 | 7

! 4
 * - style="height:2em"
 * rowspan=2
 * rowspan=5 | 7
 * Elected in 1909.Died.
 * nowrap | Mar 4, 1909 – Jan 11, 1911
 * | Democratic
 * align=right | CharlesJHughes.jpg Charles J. Hughes Jr.


 * - style="height:2em"
 * rowspan=2 |
 * rowspan=2 nowrap | Jan 11, 1911 – Jan 15, 1913
 * rowspan=2 colspan=3 | Vacant


 * - style="height:2em"
 * rowspan=2

! rowspan=5 | 5
 * - style="height:2em"
 * rowspan=2 | Elected to finish Hughes's term.
 * rowspan=5 nowrap | Jan 15, 1913 – Mar 3, 1921
 * rowspan=5 | Democratic
 * rowspan=5 align=right | Charles Spalding Thomas.jpg Charles S. Thomas

! rowspan=3 | 8
 * - style="height:2em"
 * rowspan=3 align=left | John Shafroth.gif John F. Shafroth
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Mar 4, 1913 – Mar 3, 1919
 * rowspan=3 | Elected in 1913.Lost re-election.
 * rowspan=3 | 8


 * - style="height:2em"
 * rowspan=3 | 8
 * rowspan=3 | Re-elected in 1914.Lost re-election.
 * rowspan=3 | Re-elected in 1914.Lost re-election.


 * - style="height:2em"

! rowspan=9 | 9
 * - style="height:2em"
 * rowspan=9 align=left | Lawrence Cowle Phipps2.jpg Lawrence C. Phipps
 * rowspan=9 | Republican
 * rowspan=9 nowrap | Mar 4, 1919 – Mar 3, 1931
 * rowspan=6 | Elected in 1918.
 * rowspan=6 | 9

! rowspan=2 | 6
 * - style="height:2em"
 * rowspan=6 | 9
 * rowspan=2 | Elected in 1920.Died.
 * rowspan=2 nowrap | Mar 4, 1921 – Mar 24, 1923
 * rowspan=2 | Republican
 * rowspan=2 align=right | Samuel Danford Nicholson.jpg Samuel D. Nicholson
 * rowspan=2 align=right | Samuel Danford Nicholson.jpg Samuel D. Nicholson


 * - style="height:2em"
 * rowspan=4


 * - style="height:2em"
 * nowrap | Mar 24, 1923 – May 17, 1923
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 7
 * - style="height:2em"
 * Appointed to continue Nicholson's term.Retired.
 * nowrap | May 17, 1923 – Nov 30, 1924
 * | Democratic
 * align=right | Alva Blanchard Adams 2.jpg Alva B. Adams

! rowspan=2 | 8
 * - style="height:2em"
 * rowspan=2 | Elected to finish Nicholson's term.Lost renomination.
 * rowspan=2 nowrap | Dec 1, 1924 – Mar 3, 1927
 * rowspan=2 | Republican
 * rowspan=2 align=right | Rice W. Means.jpg Rice W. Means


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1924.Retired.
 * rowspan=3 | 10

! rowspan=3 | 9
 * - style="height:2em"
 * rowspan=6 | 10
 * rowspan=3 | Elected in 1926.Died.
 * rowspan=3 nowrap | Mar 4, 1927 – Aug 27, 1932
 * rowspan=3 | Republican
 * rowspan=3 align=right | Charles Winfield Waterman.jpg Charles W. Waterman
 * rowspan=3 align=right | Charles Winfield Waterman.jpg Charles W. Waterman


 * - style="height:2em"

! rowspan=6 | 10
 * - style="height:2em"
 * rowspan=6 align=left | Senator_Edward_Prentiss_Costigan.jpg Edward P. Costigan
 * rowspan=6 | Democratic
 * rowspan=6 nowrap | Mar 4, 1931 – Jan 3, 1937
 * rowspan=6 | Elected in 1930.Retired.
 * rowspan=6 | 11
 * rowspan=4


 * - style="height:2em"
 * nowrap | Aug 27, 1932 – Sep 26, 1932
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! 10
 * - style="height:2em"
 * Appointed to continue Waterman's term.Lost election to finish Waterman's term.
 * nowrap | Sep 26, 1932 – Dec 6, 1932
 * | Democratic
 * align=right | Senator Walter Walker.jpg Walter Walker

! 11
 * - style="height:2em"
 * Elected to finish Waterman's term.Lost election to next term.
 * nowrap | Dec 7, 1932 – Mar 3, 1933
 * | Republican
 * align=right | Karl C Schuyler.jpg Karl C. Schuyler

! rowspan=5 | 12
 * - style="height:2em"
 * rowspan=3 | 11
 * rowspan=3 | Elected in 1932.
 * rowspan=5 nowrap | Mar 4, 1933 – Dec 1, 1941
 * rowspan=5 | Democratic
 * rowspan=5 align=right | Alva Blanchard Adams 2.jpg Alva B. Adams
 * rowspan=5 align=right | Alva Blanchard Adams 2.jpg Alva B. Adams


 * - style="height:2em"

! rowspan=11 | 11
 * - style="height:2em"
 * rowspan=11 align=left | Edwin Johnson.jpg Edwin C. Johnson
 * rowspan=11 | Democratic
 * rowspan=11 nowrap | Jan 3, 1937 – Jan 3, 1955
 * rowspan=5 | Elected in 1936.
 * rowspan=5 | 12


 * - style="height:2em"
 * rowspan=5 | 12
 * rowspan=2 | Re-elected in 1938.Died.
 * rowspan=2 | Re-elected in 1938.Died.


 * - style="height:2em"
 * rowspan=3


 * - style="height:2em"
 * nowrap | Dec 1, 1941 – Dec 20, 1941
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=8 | 13
 * - style="height:2em"
 * rowspan=2 | Appointed to continue Adams's term.Elected in 1942 to finish Adams's term.
 * rowspan=8 nowrap | Dec 20, 1941 – Jan 3, 1957
 * rowspan=8 | Republican
 * rowspan=8 align=right | Eugene Millikin.jpg Eugene Millikin


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1942.
 * rowspan=3 | 13


 * - style="height:2em"
 * rowspan=3 | 13
 * rowspan=3 | Re-elected in 1944.
 * rowspan=3 | Re-elected in 1944.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1948.Retired to run for Governor.
 * rowspan=3 | 14


 * - style="height:2em"
 * rowspan=3 | 14
 * rowspan=3 | Re-elected in 1950.Retired
 * rowspan=3 | Re-elected in 1950.Retired


 * - style="height:2em"

! rowspan=9 | 12
 * - style="height:2em"
 * rowspan=9 align=left | Gordon L Allott.jpg Gordon Allott
 * rowspan=9 | Republican
 * rowspan=9 nowrap | Jan 3, 1955 – Jan 3, 1973
 * rowspan=3 | Elected in 1954.
 * rowspan=3 | 15

! rowspan=3 | 14
 * - style="height:2em"
 * rowspan=3 | 15
 * rowspan=3 | Elected in 1956.Lost re-election.
 * rowspan=3 nowrap | Jan 3, 1957 – Jan 3, 1963
 * rowspan=3 | Democratic
 * rowspan=3 align=right | JohnACarroll.jpg John A. Carroll
 * rowspan=3 align=right | JohnACarroll.jpg John A. Carroll


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1960.
 * rowspan=3 | 16

! rowspan=6 | 15
 * - style="height:2em"
 * rowspan=3 | 16
 * rowspan=3 | Elected in 1962.
 * rowspan=6 nowrap | Jan 3, 1963 – Jan 3, 1975
 * rowspan=6 | Republican
 * rowspan=6 align=right | PHDominick.jpg Peter H. Dominick
 * rowspan=6 align=right | PHDominick.jpg Peter H. Dominick


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1966.Lost re-election.
 * rowspan=3 | 17


 * - style="height:2em"
 * rowspan=3 | 17
 * rowspan=3 | Re-elected in 1968.Lost re-election.
 * rowspan=3 | Re-elected in 1968.Lost re-election.


 * - style="height:2em"

! rowspan=3 | 13
 * - style="height:2em"
 * rowspan=3 align=left | FloydHaskell.jpg Floyd Haskell
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Jan 3, 1973 – Jan 3, 1979
 * rowspan=3 | Elected in 1972.Lost re-election.
 * rowspan=3 | 18

! rowspan=6 | 16
 * - style="height:2em"
 * rowspan=3 | 18
 * rowspan=3 | Elected in 1974.
 * rowspan=6 nowrap | Jan 3, 1975 – Jan 3, 1987
 * rowspan=6 | Democratic
 * rowspan=6 align=right | Gary hart.jpg Gary Hart
 * rowspan=6 align=right | Gary hart.jpg Gary Hart


 * - style="height:2em"

! rowspan=6 | 14
 * - style="height:2em"
 * rowspan=6 align=left | Sen William L Armstrong.jpg William L. Armstrong
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Jan 3, 1979 – Jan 3, 1991
 * rowspan=3 | Elected in 1978.
 * rowspan=3 | 19


 * - style="height:2em"
 * rowspan=3 | 19
 * rowspan=3 | Re-elected in 1980.Retired.
 * rowspan=3 | Re-elected in 1980.Retired.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1984.Retired.
 * rowspan=3 | 20

! rowspan=3 | 17
 * - style="height:2em"
 * rowspan=3 | 20
 * rowspan=3 | Elected in 1986.Retired.
 * rowspan=3 nowrap | Jan 3, 1987 – Jan 3, 1993
 * rowspan=3 | Democratic
 * rowspan=3 align=right | Tim Wirth (1).jpg Tim Wirth
 * rowspan=3 align=right | Tim Wirth (1).jpg Tim Wirth


 * - style="height:2em"

! rowspan=4 | 15
 * - style="height:2em"
 * rowspan=4 align=left | HankBrown.jpg Hank Brown
 * rowspan=4 | Republican
 * rowspan=4 nowrap | Jan 3, 1991 – Jan 3, 1997
 * rowspan=4 | Elected in 1990.Retired.
 * rowspan=4 | 21

! rowspan=7 | 18
 * - style="height:2em"
 * rowspan=4 | 21
 * rowspan=4 | Elected in 1992.Changed parties on March 3, 1995.
 * rowspan=7 nowrap | Jan 3, 1993 – Jan 3, 2005
 * rowspan=2 | Democratic
 * rowspan=7 align=right | BenNCampbell.jpg Ben Nighthorse Campbell
 * rowspan=7 align=right | BenNCampbell.jpg Ben Nighthorse Campbell


 * - style="height:2em"
 * rowspan=2


 * - style="height:2em"
 * rowspan=5 | Republican

! rowspan=6 | 16
 * - style="height:2em"
 * rowspan=6 align=left | Wayne Allard official portrait.jpg Wayne Allard
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Jan 3, 1997 – Jan 3, 2009
 * rowspan=3 | Elected in 1996.
 * rowspan=3 | 22


 * - style="height:2em"
 * rowspan=3 | 22
 * rowspan=3 | Re-elected in 1998.Retired.
 * rowspan=3 | Re-elected in 1998.Retired.


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2002.Retired.
 * rowspan=3 | 23

! rowspan=3 | 19
 * - style="height:2em"
 * rowspan=4 | 23
 * rowspan=3 | Elected in 2004.Resigned to become U.S. Secretary of the Interior.
 * rowspan=3 nowrap | Jan 3, 2005 – Jan 20, 2009
 * rowspan=3 | Democratic
 * rowspan=3 align=right | Kensalazar.jpg Ken Salazar
 * rowspan=3 align=right | Kensalazar.jpg Ken Salazar


 * - style="height:2em"

! rowspan=4 | 17
 * - style="height:2em"
 * rowspan=4 align=left | MarkUdall-Senate Portrait.jpg Mark Udall
 * rowspan=4 | Democratic
 * rowspan=4 nowrap | Jan 3, 2009 – Jan 3, 2015
 * rowspan=4 | Elected in 2008.Lost re-election.
 * rowspan=4 | 24
 * rowspan=2

! rowspan=10 | 20
 * - style="height:2em"
 * Appointed to finish Salazar's term.
 * rowspan=10 nowrap | Jan 21, 2009 – present
 * rowspan=10 | Democratic
 * rowspan=10 align=right | MichaelBennetofficialphoto.jpg Michael Bennet


 * - style="height:2em"
 * rowspan=3 | 24
 * rowspan=3 | Elected to a full term in 2010.
 * rowspan=3 | Elected to a full term in 2010.


 * - style="height:2em"

! rowspan=3 | 18
 * - style="height:2em"
 * rowspan=3 align=left | Cory Gardner official Senate portrait.jpeg Cory Gardner
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Jan 3, 2015 – Jan 3, 2021
 * rowspan=3 | Elected in 2014.Lost re-election.
 * rowspan=3 | 25


 * - style="height:2em"
 * rowspan=3 | 25
 * rowspan=3 | Re-elected in 2016.
 * rowspan=3 | Re-elected in 2016.


 * - style="height:2em"

! rowspan=3 | 19
 * - style="height:2em"
 * rowspan=3 align=left | John Hickenlooper, official portrait, 117th Congress.jpeg John Hickenlooper
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Jan 3, 2021 – present
 * rowspan=3 | Elected in 2020.
 * rowspan=3 | 26


 * - style="height:2em"
 * rowspan=3 |26
 * rowspan=3 | Re-elected in 2022.
 * 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 | 27


 * - style="height:2em"
 * 27
 * colspan=5 | To be determined in the 2028 election.
 * colspan=5 | To be determined in the 2028 election.