Colorado's 4th congressional district
Interactive map of district boundaries since January 3, 2023
Representative	Lauren Boebert R–Windsor
Distribution	72.9% urban[1] 27.1% rural
Population (2024)	789,599[2]
Median household income	$120,070[3]
Ethnicity	75.8%White 13.6%Hispanic 4.5%Two or more races 3.5%Asian 1.7%Black 0.9% other
Cook PVI	R+9[4]

Colorado's 4th congressional district is acongressional district in theU.S. state ofColorado. Located in the eastern part of the state, the district encompasses most of the ruralEastern Plains, as well as portions of the ColoradoFront Range, includingLoveland,Highlands Ranch,Castle Rock, andParker.

The district is currently represented byRepublicanLauren Boebert. With aCook Partisan Voting Index rating of R+9, it is the most Republican district in Colorado.^[4] It is also the wealthiest congressional district in the state ofColorado.^[5]

Following the1990 U.S. census and associated realignment of Colorado congressional districts, the 4th congressional district consisted ofBaca,Bent,Cheyenne,Crowley,Elbert,Kiowa,Kit Carson,Larimer,Las Animas,Lincoln,Logan,Morgan,Otero,Phillips,Prowers,Sedgwick,Washington,Weld andYuma counties, as well as portions ofAdams andArapahoe counties.

Following the2000 U.S. census and associated realignment of Colorado congressional districts, the 4th congressional district consisted ofBaca,Bent,Cheyenne,Crowley,Kiowa,Kit Carson,Larimer,Lincoln,Logan,Morgan,Phillips,Prowers,Sedgwick,Washington,Weld andYuma counties, as well as portions ofBoulder, andOtero counties.

Following the2010 U.S. census and associated realignment of Colorado congressional districts, the 4th congressional district consisted of Baca, Bent, Cheyenne, Crowley, Elbert, Kiowa, Kit Carson, Las Animas, Lincoln, Logan, Morgan, Otero, Phillips, Prowers, Sedgwick, Washington, Weld and Yuma counties. The district also includes portions of Adams, Arapahoe, Boulder andDouglas counties and very little portions ofLarimer County.

This district consists mainly of the area of Colorado that is part of theGreat Plains region of the United States. It is largelyrural. The only large populated places in the district areLoveland,Highlands Ranch,Castle Rock, andParker. Until the 2010s redistricting,Fort Collins was the largest city in the district and provided a large Democratic base, making the district somewhat competitive: before the 2020 redistricting,Greeley was the largest city in the district but has since been moved to the8th district.

While the 4th takes in some suburbs of the Democratic-leaningDenver metropolitan area, the 4th takes inDouglas County, the most Republican region in the area. However, it is still far more friendly to the Democrats than the other counties in the district (especially in blue-leaningHighlands Ranch andLone Tree) and is the only area in the district with any Democratic support of real significance. On the other hand, the district takes in some of the most Republican counties in Colorado, such asWashington,Kit Carson, andLogan, where Democrats rarely exceed even 20 percent of the vote.

Historically, the district has been Republican-leaning, thoughMarilyn Musgrave won relatively narrow victories in 2004 and 2006 due to her Democratic opponents' strength in Fort Collins. Musgrave had to rely on strong performances in more conservative Greeley to hold onto her seat. In 2008, Musgrave lost reelection toBetsy Markey, who became the first Democrat to represent the district since the early 1970s. Markey was defeated in 2010 by RepublicanCory Gardner, and the district was made more Republican in redistricting due to the removal of Fort Collins.

George W. Bush received 58% of the vote in this district in 2004.John McCain narrowly carried the district in 2008 with 50% of the vote.

The current incumbent,RepublicanLauren Boebert, was elected to the seat on November 5, 2024, having previously represented Colorado's 3rd Congressional District. Boebert defeated Democratic nominee and formerAFL-CIO speechwriter Trisha Calvarese.^[6][7]

For the118th and successive Congresses (based on redistricting following the2020 census), the district contains all or portions of the following counties and communities:^[8]

AdamsCounty(3)

Bennett,Strasburg (shared with Arapahoe County),Watkins (shared with Arapahoe County)

ArapahoeCounty(7)

Brick Center,Byers,Comanche Creek,Deer Trail,Peoria,Strasburg (shared with Adams County),Watkins (shared with Adams County)

BacaCounty(6)

All 6 communities

BentCounty(3)

All 3 communities

CheyenneCounty(3)

All 3 communities

CrowleyCounty(4)

All 4 communities

DouglasCounty(22)

Acres Green,Castle Pines,Castle Pines Village,Castle Rock,Franktown,Grand View Estates,Highlands Ranch,Larkspur,Lone Tree,Louviers,Meridian,Meridian Village,Parker,Perry Park,Roxborough Park,Sedalia,Sierra Ridge,Stepping Stone,Sterling Ranch,Stonegate,The Pinery,Westcreek

ElbertCounty(6)

All 6 communities

El PasoCounty(2)

Calhan,Ramah

KiowaCounty(5)

All 5 communities

Kit CarsonCounty(6)

All 6 communities

LarimerCounty(3)

Loveland,Wellington,Windsor (shared with Weld County)

LincolnCounty(4)

All 4 communities

LincolnCounty(4)

All 4 communities

LoganCounty(8)

All 8 communities

MorganCounty(13)

All 13 communities

PhillipsCounty(4)

All 4 communities

ProwersCounty(5)

All 5 communities

SedgwickCounty(3)

All 3 communities

WashingtonCounty(3)

All 3 communities

WeldCounty(11)

Ault,Briggsdale,Eaton,Grover,Hudson,Keenesburg,Nunn,Pierce,Raymer,Severance,Windsor (shared Larimer County)

Member	Party	Term duration	Cong ress(es)	Electoral history	District location
District created March 4, 1915
Edward T. Taylor (Glenwood Springs)	Democratic	March 4, 1915 – September 3, 1941	64th 65th 66th 67th 68th 69th 70th 71st 72nd 73rd 74th 75th 76th 77th	Redistricted from theat-large district andre-elected in 1914. Re-elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Re-elected in 1924. Re-elected in 1926. Re-elected in 1928. Re-elected in 1930. Re-elected in 1932. Re-elected in 1934. Re-elected in 1936. Re-elected in 1938. Re-elected in 1940. Died.
Vacant		September 3, 1941 – December 9, 1941	77th
Robert F. Rockwell (Paonia)	Republican	December 9, 1941 – January 3, 1949	77th 78th 79th 80th	Elected to finish Taylor's term. Re-elected in 1942. Re-elected in 1944. Re-elected in 1946. Lost re-election.
Wayne N. Aspinall (Palisade)	Democratic	January 3, 1949 – January 3, 1973	81st 82nd 83rd 84th 85th 86th 87th 88th 89th 90th 91st 92nd	Elected in 1948. Re-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. Re-elected in 1970. Lost renomination.
James Paul Johnson (Fort Collins)	Republican	January 3, 1973 – January 3, 1981	93rd 94th 95th 96th	Elected in 1972. Re-elected in 1974. Re-elected in 1976. Re-elected in 1978. Retired.
Hank Brown (Greeley)	Republican	January 3, 1981 – January 3, 1991	97th 98th 99th 100th 101st	Elected in 1980. Re-elected in 1982. Re-elected in 1984. Re-elected in 1986. Re-elected in 1988. Retired torun for U.S. Senator.
Wayne Allard (Loveland)	Republican	January 3, 1991 – January 3, 1997	102nd 103rd 104th	Elected in 1990. Re-elected in 1992. Re-elected in 1994. Retired torun for U.S. Senator.
Bob Schaffer (Fort Collins)	Republican	January 3, 1997 – January 3, 2003	105th 106th 107th	Elected in 1996. Re-elected in 1998. Re-elected in 2000. Retired.
Marilyn Musgrave (Fort Morgan)	Republican	January 3, 2003 – January 3, 2009	108th 109th 110th	Elected in 2002. Re-elected in 2004. Re-elected in 2006. Lost re-election.	2003–2013
Betsy Markey (Fort Collins)	Democratic	January 3, 2009 – January 3, 2011	111th	Elected in 2008. Lost re-election.
Cory Gardner (Yuma)	Republican	January 3, 2011 – January 3, 2015	112th 113th	Elected in 2010. Re-elected in 2012. Retired torun for U.S. Senator.
					2013–2023
Ken Buck (Windsor)	Republican	January 3, 2015 – March 22, 2024	114th 115th 116th 117th 118th	Elected in 2014. Re-elected in 2016. Re-elected in 2018. Re-elected in 2020. Re-elected in 2022. Resigned.
					2023–present
Vacant		March 22, 2024 – July 8, 2024	118th
Greg Lopez (Elizabeth)	Republican	July 8, 2024 – January 3, 2025		Elected to finish Buck's term. Retired.
Lauren Boebert (Windsor)	Republican	January 3, 2025 – present	119th	Moved from the3rd district andre-elected in 2024.

• Colorado's congressional districts
• List of United States congressional districts

• Martis, Kenneth C. (1989).The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982).The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–presentArchived April 23, 2010, at theWayback Machine

• Interactive map of Colorado's 4th Congressional District

39°04′15″N103°24′50″W / 39.07083°N 103.41389°W /39.07083; -103.41389

• Congressional districts of Colorado
• 1915 establishments in Colorado

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