Colorado's 1st congressional district

Colorado's 1st congressional district is a congressional district in the U.S. state of Colorado, based primarily in the City and County of Denver in the central part of the state. The district includes almost all of the City and County of Denver, and the Denver enclaves of Glendale and Holly Hills. A small portion of the City and County of Denver near Four Square Mile is located in Colorado's 6th congressional district.

The district has been represented by Democrat Diana DeGette since 1997. In 2026, DeGette lost the Democratic Primary to Democratic Socialist Melat Kiros. An urban and diverse district based in the heart of Metropolitan Denver, and with a Cook Partisan Voting Index rating of D+29, it is the most Democratic district in both Colorado and the Mountain West. Only two Republicans have been elected to the seat since the Great Depression: Dean M. Gillespie was the district's representative from 1944 to 1947; and Mike McKevitt from 1971 to 1973, winning thanks to an ideological split among Denver Democrats. No Republican has even notched 30% of the vote in the district after 1998.

History

1990s Following the 1990 United States census and consequential redrawing of Colorado's congressional districts, the 1st congressional district consisted of all of the City and County of Denver and parts of Adams, Arapahoe, and Jefferson counties.

2000s Following the 2000 United States census and consequential redistricting of Colorado's congressional districts, the 1st congressional district consisted of all of the City and County of Denver and parts of Arapahoe County, including parts or all of the cities of Englewood, Cherry Hills Village, Sheridan, Aurora, and Glendale.

2010s

Following the 2010 United States census and consequential redistricting of Colorado's congressional districts, the 1st congressional district consisted of all of the City and County of Denver and parts of Arapahoe County including parts or all of the cities of Englewood, Cherry Hills Village, Sheridan, Aurora, and Glendale. The 1st district also took in additional area in the southwestern suburbs which included parts of Jefferson County and the CDPs of Columbine and Ken Caryl.

2020s

Following the 2020 United States census and consequential redistricting of Colorado's congressional districts, the 1st congressional district consisted of all of the City and County of Denver and parts of Arapahoe County that are enclaves within the Denver city borders such as Glendale and Holly Hills: the Jefferson County portions were moved to the 7th District, while the southern Arapahoe County suburbs were moved to the Aurora-based 6th District.

Composition For the 118th and successive Congresses (based on redistricting following the 2020 census), the district contains all or portions of the following counties and communities:

Arapahoe County (2) Glendale, Holly Hills

Denver County (1)

Denver (part; also 6th)

Recent election results from statewide races Year Office Results2008 PresidentObama 75% - 23% SenateUdall 73% - 23%2010 SenateBennet 71% - 24% GovernorHickenlooper 74% - 4% Secretary of StateBuescher 68% - 27% TreasurerKennedy 73% - 27% Attorney GeneralGarnett 67% - 33%2012 PresidentObama 75% - 25%2014 SenateUdall 70% - 25%2016 PresidentClinton 74% - 19% SenateBennet 73% - 22%2018 GovernorPolis 77% - 20% Attorney GeneralWeiser 76% - 21%2020 PresidentBiden 80% - 18% SenateHickenlooper 78% - 20%2022 SenateBennet 80% - 18% GovernorPolis 82% - 16% Secretary of StateGriswold 78% - 19% TreasurerYoung 77% - 20% Attorney GeneralWeiser 79% - 19%2024 PresidentHarris 77% - 21%

List of members representing the district Member Party Years Congress(es) Electoral history District location District created March 4, 1893 Lafayette Pence Populist March 4, 1893 –March 3, 1895 Elected in 1892.Lost re-election. 1893–1915Adams, Arapahoe, Boulder, Denver, Jackson, Jefferson, Lake, Larimer, Logan, Morgan, Park, Phillips, Sedgwick, Washington, Weld, and Yuma John F. Shafroth Republican March 4, 1895 –March 3, 1897 Elected in 1894.Changed parties and re-elected in 1896.Re-elected in 1898.Re-elected in 1900.Changed parties and re-elected in 1902.Resigned amid election contest. Silver Republican March 4, 1897 –March 3, 1903 Democratic March 4, 1903 –February 15, 1904 Robert W. Bonynge Republican February 16, 1904 –March 3, 1909 Won election contest.Re-elected in 1904.Re-elected in 1906.Lost re-election. Atterson W. Rucker Democratic March 4, 1909 –March 3, 1913 Elected in 1908.Re-elected in 1910.Lost renomination. George Kindel Democratic March 4, 1913 –March 3, 1915 Elected in 1912.Retired to run for U.S. senator. Benjamin Hilliard Democratic March 4, 1915 –March 3, 1919 Elected in 1914.Re-elected in 1916.Lost re-election. 1915–1923 William Vaile Republican March 4, 1919 –July 2, 1927 Elected in 1918.Re-elected in 1920.Re-elected in 1922.Re-elected in 1924.Re-elected in 1926.Died. 1923–1965 Vacant July 2, 1927 –November 15, 1927 S. Harrison White Democratic November 15, 1927 –March 3, 1929 Elected to finish Vaile's term.Lost re-election. William R. Eaton Republican March 4, 1929 –March 3, 1933 Elected in 1928.Re-elected in 1930.Lost re-election. Lawrence Lewis Democratic March 4, 1933 –December 9, 1943 Elected in 1932.Re-elected in 1934.Re-elected in 1936.Re-elected in 1938.Re-elected in 1940.Re-elected in 1942.Died. Vacant December 9, 1943 –March 7, 1944 Dean M. Gillespie Republican March 7, 1944 –January 3, 1947 Elected to finish Lewis's term.Re-elected later in 1944.Lost re-election. John A. Carroll Democratic January 3, 1947 –January 3, 1951 Elected in 1946.Re-elected in 1948.Retired to run for U.S. senator. Byron Rogers Democratic January 3, 1951 –January 3, 1971 Elected in 1950.Re-elected in 1952.Re-elected in 1954.Re-elected in 1956.Re-elected in 1958.Re-elected in 1960.Re-elected in 1962.Re-elected in 1964.Re-elected in 1966.Re-elected in 1968.Lost renomination. 1965–1973 Mike McKevitt Republican January 3, 1971 –January 3, 1973 Elected in 1970.Lost re-election. Pat Schroeder Democratic January 3, 1973 –January 3, 1997 Elected in 1972.Re-elected in 1974.Re-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.Re-elected in 1992.Re-elected in 1994.Retired. 1973–1983Parts of Arapahoe and Denver 1983–1993Parts of Arapahoe and Denver 1993–2003Denver; parts of Adams and Arapahoe Diana DeGette Democratic January 3, 1997 –present Elected in 1996.Re-elected in 1998.Re-elected in 2000.Re-elected in 2002.Re-elected in 2004.Re-elected in 2006.Re-elected in 2008.Re-elected in 2010.Re-elected in 2012.Re-elected in 2014.Re-elected in 2016.Re-elected in 2018.Re-elected in 2020.Re-elected in 2022.Re-elected in 2024. Lost renomination. 2003–2013Denver; parts of Arapahoe 2013–2023Denver; parts of Arapahoe and Jefferson 2023–presentParts of Denver; parts of Arapahoe (enclaves only)

Election results

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2022–2032 2022

2024

Historical district boundaries

Colorado's 1st congressional district

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