Colorado's congressional delegations

Since Colorado became a U.S. state in 1876, it has sent congressional delegations to the United States Senate and United States House of Representatives, beginning with the 44th United States Congress. Prior to statehood, the Colorado Territory sent non-voting delegates to the House of Representatives from 1861 to 1876. Each state elects two senators to serve for six years, and members of the House to two-year terms. Each state elects two senators to serve for six years in general elections, with their re-election staggered. Prior to the ratification of the Seventeenth Amendment in 1913, senators were elected by the Colorado General Assembly. Each state elects a varying number of, but at least one, member of the House, depending on population, to two-year terms. Colorado has sent eight members to the House in each congressional delegation since the 2020 United States Census.

A total of 83 people have served Colorado in the House and 37 have served Colorado in the Senate. The first of seven women to serve Colorado in Congress was Pat Schroeder, who served in the House from 1973 to 1996. The first and only African-American to have served Colorado in Congress is Joe Neguse.

The current dean, or longest-serving member, of the Colorado delegation is Representative Diana DeGette of the , who has served in the House since 1997. She is the second-longest serving member of Congress in Colorado history, only behind Edward T. Taylor, who served in the House from 1909 to 1941. DeGette lost the 2026 Democratic primary in her district; after her term ends on January 20, 2027, senior senator Michael Bennet will become the Colorado delegation's dean. Henry M. Teller, who served more than 30 years in the Senate, is the longest-serving senator in Colorado history.

Current delegation Colorado's current congressional delegation to the consists of two senators, both of whom are Democrats, and eight representatives comprising four Democrats and four Republicans.

The state of Colorado gained an beginning in 2023. The current dean of the Colorado delegation is Representative Diana DeGette of the , who has served in the House since 1997.

The Cook Partisan Voting Index (CPVI) is a measure of how strongly partisan a state is. It measures the party leaning (Democratic or Republican) and the number of percentage points more partisan than the national average. For instance, R+4 would mean the state voted four percentage points more Republican than the national average. As of 2025, the CPVI ranked Colorado's 1st, 2nd, 6th, and 7th districts as leaning Democratic, and the 3rd, 4th, and 5th districts as leaning Republican. The 8th district is ranked as even. As a state, Colorado is ranked as leaning Democratic, with a score of D+6.

+ Current U.S. senators from Colorado CPVI : Class II senator Class III senator John Hickenlooper(Junior senator) Michael Bennet(Senior senator) Party Incumbent since January 3, 2021 January 21, 2009

United States Senate

Two senators from Colorado, Henry M. Teller and Ken Salazar, have also served as the United States Secretary of the Interior, under the Arthur administration and Obama administration respectively. Salazar is currently serving as the United States ambassador to Mexico under the Biden administration. Many senators from Colorado, including John F. Shafroth and Edwin C. Johnson, also served as the governor of Colorado. Some have also been at the forefront of national politics during their careers, including Eugene Millikin, who served as the chairman of the Senate Republican Conference, and Gary Hart, who finished second in the 1984 Democratic Party presidential primaries and was considered a frontrunner in the 1988 Democratic Party presidential primaries.

Senators are elected every six years depending on their class, with each senator serving a six-year term, and elections for senators occurring every two years, rotating through each class such that each election, around one-third of the seats in the Senate are up for election. Colorado's senators are elected in classes II and III. Currently, Colorado is represented in the Senate by Michael Bennet and John Hickenlooper.

+ Senators from Colorado Class II senator Congress Class III senator Henry M. Teller (R) (1875–1877) Jerome B. Chaffee (R) (1877–1879) (1879–1881) Nathaniel P. Hill (R) (1881–1883) George M. Chilcott (R) Horace Tabor (R) Thomas M. Bowen (R) (1883–1885) (1885–1887) Henry M. Teller (R) (1887–1889) Edward O. Wolcott (R) (1889–1891) (1891–1893) (1893–1895) (1895–1897) (1897–1899) Henry M. Teller (SvR) (1899–1901) Thomas M. Patterson (D) (1901–1903) (1903–1905) Henry M. Teller (D) (1905–1907) Simon Guggenheim (R) (1907–1909) (1909–1911) Charles J. Hughes Jr. (D) (1911–1913) Charles S. Thomas (D) John F. Shafroth (D) (1913–1915) (1915–1917) (1917–1919) Lawrence C. Phipps (R) (1919–1921) (1921–1923) Samuel D. Nicholson (R) (1923–1925) Alva B. Adams (D) Rice W. Means (R) (1925–1927) (1927–1929) Charles W. Waterman (R) (1929–1931) Edward P. Costigan (D) (1931–1933) Walter Walker (D) Karl C. Schuyler (R) (1933–1935) Alva B. Adams (D) (1935–1937) Edwin C. Johnson (D) (1937–1939) (1939–1941) (1941–1943) Eugene Millikin (R) (1943–1945) (1945–1947) (1947–1949) (1949–1951) (1951–1953) (1953–1955) Gordon Allott (R) (1955–1957) (1957–1959) John A. Carroll (D) (1959–1961) (1961–1963) (1963–1965) Peter H. Dominick (R) (1965–1967) (1967–1969) (1969–1971) (1971–1973) Floyd Haskell (D) (1973–1975) (1975–1977) Gary Hart (D) (1977–1979) William L. Armstrong (R) (1979–1981) (1981–1983) (1983–1985) (1985–1987) (1987–1989) Tim Wirth (D) (1989–1991) Hank Brown (R) (1991–1993) (1993–1995) Ben Nighthorse Campbell (D) (1995–1997) Ben Nighthorse Campbell (R) Wayne Allard (R) (1997–1999) (1999–2001) (2001–2003) (2003–2005) (2005–2007) Ken Salazar (D) (2007–2009) Mark Udall (D) (2009–2011) Michael Bennet (D) (2011–2013) (2013–2015) Cory Gardner (R) (2015–2017) (2017–2019) (2019–2021)John Hickenlooper (D) (2021–2023) (2023–2025) (2025–2027)

United States House of Representatives

Many representatives from Colorado have played important roles in the House of Representatives, including by chairing congressional committees. For instance, Wayne N. Aspinall chaired the United States House Committee on Natural Resources from 1959 to 1973, and Edward T. Taylor chaired the United States House Committee on Appropriations for more than three terms. Taylor was also influential in the passing of the Taylor Grazing Act of 1934, which is named after him. Others took on important roles later in their careers, such as John F. Shafroth, who later became the governor of Colorado and a senator from Colorado known for his influence over the passing of the Federal Reserve Act of 1913. Seven women have served Colorado in the House, the first being Pat Schroeder, and the first and only African-American to have served Colorado in the House is Joe Neguse.

Each district uses a popular vote to elect a member of Colorado's delegation in the House of Representatives. Districts are redrawn every ten years, after data from the US Census is collected. From 1861 to 1876, Colorado sent a non-voting delegate to the House of Representatives; when it became a state in 1876, it had one seat in the House. Since then, its representation in the House has grown along with its population. Since 2023, Colorado has had eight congressional districts drawn according to the results of the 2020 United States Census.

1861–1876: 1 non-voting delegate Starting on August 19, 1861, the Territory of Colorado sent a non-voting delegate to the House.

+ Delegates to the House of Representatives from Colorado from 1861 to 1877 Congress Delegate from 37th (1861–1863) Hiram Pitt Bennet (Cons. R) 38th (1863–1865) 39th (1865–1867) Allen Alexander Bradford (R) 40th (1867–1869) George M. Chilcott (R) 41st (1869–1871) Allen Alexander Bradford (R) 42nd (1871–1873) Jerome B. Chaffee (R) 43rd (1873–1875) 44th (1875–1877) Thomas M. Patterson (D)

1876–1893: 1 seat Following statehood on August 1, 1876, the state of Colorado was apportioned one seat in the House.

+ Members of the House of Representatives from Colorado from 1876 to 1893 Congress 44th James B. Belford (R) 45th Thomas M. Patterson (D) 46th James B. Belford (R) 47th 48th 49th George G. Symes (R) 50th 51st Hosea Townsend (R) 52nd

1893–1903: 2 seats Following the 1890 census, Colorado was apportioned two seats.

+ Members of the House of Representatives from Colorado from 1893 to 1903 Congress District 53rd Lafe Pence (Pop) John Calhoun Bell (Pop) 54th John F. Shafroth (R) 55th John F. Shafroth (Sv) 56th 57th

1903–1913: 3 seats Following the 1900 census, Colorado was apportioned three seats.

+ Members of the House of Representatives from Colorado from 1903 to 1913 Congress District 58th John F. Shafroth (D) Herschel M. Hogg (R) Franklin E. Brooks (R) Robert W. Bonynge (R) 59th 60th Warren A. Haggott (R) George W. Cook (R) 61st Atterson W. Rucker (D) John Andrew Martin (D) Edward T. Taylor (D) 62nd

1913–1973: 4 seats Following the 1910 census, Colorado was apportioned four seats.

+ Members of the House of Representatives from Colorado from 1913 to 1973 Congress District Seat A Seat B 63rd George John Kindel (D) Harry H. Seldomridge (D) Edward Keating (D) Edward T. Taylor (D) 64th Benjamin Hilliard (D) Charles B. Timberlake (R) Edward Keating (D) Edward T. Taylor (D) 65th 66th William N. Vaile (R) Guy U. Hardy (R) 67th 68th 69th 70th S. Harrison White (D) 71st William R. Eaton (R) 72nd 73rd Lawrence Lewis (D) Fred N. Cummings (D) John Andrew Martin (D) 74th 75th 76th William E. Burney (D) 77th William S. Hill (R) John Chenoweth (R) Robert F. Rockwell (R) 78th Dean M. Gillespie (R) 79th 80th John A. Carroll (D) 81st John H. Marsalis (D) Wayne N. Aspinall (D) 82nd Byron G. Rogers (D) John Chenoweth (R) 83rd 84th 85th 86th Byron L. Johnson (D) 87th Peter H. Dominick (R) 88th Donald G. Brotzman (R) 89th Roy H. McVicker (D) Frank Evans (D) 90th Donald G. Brotzman (R) 91st 92nd Mike McKevitt (R) Congress District

1973–1983: 5 seats Following the 1970 census, Colorado was apportioned five seats.

+ Members of the House of Representatives from Colorado from 1973 to 1983 Congress District 93rd Pat Schroeder (D)Donald G. Brotzman (R) Frank Evans (D) James Johnson (R) William L. Armstrong (R) 94th Tim Wirth (D) 95th 96th Ray Kogovsek (D) Ken Kramer (R) 97th Hank Brown (R)

1983–2003: 6 seats Following the 1980 census, Colorado was apportioned six seats.

+ Members of the House of Representatives from Colorado from 1983 to 2003 Congress District 98th Pat Schroeder (D) Tim Wirth (D)Ray Kogovsek (D) Hank Brown (R) Ken Kramer (R) Daniel Schaefer (R) 99th Mike Strang (R) 100th David Skaggs (D) Ben NighthorseCampbell (D) Joel Hefley (R) 101st 102nd Wayne Allard (R) 103rd Scott McInnis (R) 104th 105th Diana DeGette (D) Bob Schaffer (R) 106th Mark Udall (D) Tom Tancredo (R) 107th

2003–2023: 7 seats Following the 2000 census, Colorado was apportioned seven seats.

+ Members of the House of Representatives from Colorado from 2003 to 2023 Congress District 108th Diana DeGette(D) Mark Udall (D) Scott McInnis (R) MarilynMusgrave (R) Joel Hefley (R) Tom Tancredo(R) Bob Beauprez(R) 109th John Salazar (D) 110th Doug Lamborn(R) Ed Perlmutter(D) 111th Jared Polis (D) Betsy Markey (D) Mike Coffman(R) 112th Scott Tipton (R) Cory Gardner (R) 113th 114th Ken Buck (R) 115th 116th Joe Neguse (D) Jason Crow (D) 117th Lauren Boebert (R)

2023–present: 8 seats Since the 2020 census, Colorado has been apportioned eight seats.

+ Members of the House of Representatives from Colorado from 2023 to present Congress District 118th Diana DeGette (D) Joe Neguse (D) Lauren Boebert (R) Ken Buck (R) Doug Lamborn (R) Jason Crow (D) Brittany Pettersen (D) Yadira Caraveo (D) Greg Lopez (R) 119th Jeff Hurd (R) Lauren Boebert (R) Jeff Crank (R) Gabe Evans (R)

See also

List of United States congressional districts