# 2018 United States House of Representatives elections in Colorado

Elections in Colorado :
Federal government
Presidential elections
1876
1880
1884
1888
1892
1896
1900
1904
1908
1912
1916
1920
1924
1928
1932
1936
1940
1944
1948
1952
1956
1960
1964
1968
1972
1976
1980
1984
1988
1992
1996
2000
2004
2008
2012
2016
2020
2024
Presidential caucuses and primaries
Democratic
2000
2008
2012
2016
2020
2024
Republican
2008
2012
2016
2020
2024
U.S. Senate elections
1876
1879
1883 sp
1885
1889
1891
1895
1897
1901
1903
1907
1909
1913
1913 sp
1914
1918
1920
1924
1924 sp
1926
1930
1932
1932 sp
1936
1938
1942
1942 sp
1944
1948
1950
1954
1956
1960
1962
1966
1968
1972
1974
1978
1980
1984
1986
1990
1992
1996
1998
2002
2004
2008
2010
2014
2016
2020
2022
2026
2028
U.S. House of Representatives elections
1876
1878
1880
1882
1884
1886
1888
1890
1892
1894
1896
1898
1900
1902
1904
1906
1908
1910
1912
1914
1916
1918
1920
1922
1924
1926
1927
1st sp
1928
1930
1932
1934
1936
1938
1940
3rd sp
1941
4th sp
1942
1944
1st sp
1946
1948
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1983
6th sp
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
2006
2008
2010
2012
2014
2016
2018
2020
2022
2024
4th sp :
State government
General elections
2010
2014
2018
2020
2022
Gubernatorial elections
1876
1878
1880
1882
1884
1886
1888
1890
1894
1896
1898
1900
1902
1904
1906
1908
1910
1912
1914
1916
1918
1920
1922
1924
1926
1928
1930
1932
1934
1936
1938
1940
1942
1944
1946
1948
1950
1952
1954
1956
1958
1962
1966
1970
1974
1978
1982
1986
1990
1994
1998
2002
2006
2010
2014
2018
2022
2026
Secretary of State elections
2022
Attorney General elections
2014
2018
2022
Treasurer elections
2022
Colorado State Board of Regent elections
2016
Senate elections
2013 (recall)
2014
2016
2018
2020
2022
2024
House of Representatives elections
2018
2020
2022
2024 :
Ballot measures
List of Colorado ballot measures
1893
2
1972
8
1974
1
1982
1
1992
2
2000
20
2004
36
2006
38
41
42
43
44
E
F
G
H
I
J
K
2008
46
47
48
49
50
51
52
54
58
59
L
2010
62
2012
64
2018
A
2020
B
C
EE
113
114
2022
125
126
FF
2023
HH
II
2024
79
80
I
J
127
128
129
131 :
Colorado Springs
Local elections
2019
Mayoral elections
1995
1997 sp
1999
2003
2007
2011
2015
2019
2023 :
Denver
Mayoral elections
2003
2007
2011
2015
2019
2023 :
El Paso County
Local elections
2018 :
Pueblo
Mayoral elections
2023–24 :
vte :
The 2018 United States House of Representatives elections in Colorado were held on November 6, 2018, to elect the seven U.S. representatives from the state of Colorado, one from each of the state's seven congressional districts. The Republican and Democratic Party primaries in Colorado were held on June 26, 2018. The elections coincided with the gubernatorial election, as well as other elections to the House of Representatives, elections to the United States Senate, and various state and local elections.

## Overview
### Statewide

| Party | Party | Candidates | Votes | Votes | Seats | Seats | Seats |
| Party | Party | Candidates | No. | % | No. | +/– | % |
| | Democratic | 7 | 1,343,211 | 53.44 | 4 | 1 | 57.14 |
| | Republican | 7 | 1,079,772 | 42.96 | 3 | 1 | 42.95 |
| | Libertarian | 6 | 58,769 | 2.34 | 0 | | 0.0 |
| | Independent | 2 | 27,187 | 1.08 | 0 | | 0.0 |
| | Unity | 2 | 4,623 | 0.18 | 0 | | 0.0 |
| | Green | 5 | 207 | 0.01 | 0 | | 0.0 |
| | Write-in | 5 | 137 | 0.01 | 0 | | 0.0 |
| Total | Total | 34 | 2,513,906 | 100.0 | 7 | | 100.0 |
Popular vote
Democratic
53.43%
Republican
42.95%
Libertarian
2.34%
Other
1.28% :
House seats
Democratic
57.14%
Republican
42.86%
Libertarian
0.00%
Other
0.00% :

### By district

Results of the 2018 United States House of Representatives elections in Colorado by district:
| District | Democratic | Democratic | Republican | Republican | Others | Others | Total | Total | Result |
| District | Votes | % | Votes | % | Votes | % | Votes | % | Result |
| District 1 | 272,886 | 73.81% | 85,207 | 23.05% | 11,622 | 3.14% | 369,715 | 100.0% | Democratic hold |
| District 2 | 259,608 | 60.27% | 144,901 | 33.64% | 26,256 | 6.09% | 430,765 | 100.0% | Democratic hold |
| District 3 | 146,426 | 43.55% | 173,205 | 51.52% | 16,570 | 4.93% | 336,201 | 100.0% | Republican hold |
| District 4 | 145,544 | 39.38% | 224,038 | 60.61% | 38 | 0.01% | 369,620 | 100.0% | Republican hold |
| District 5 | 126,848 | 39.30% | 184,002 | 57.02% | 11,866 | 3.68% | 322,716 | 100.0% | Republican hold |
| District 6 | 187,639 | 54.10% | 148,685 | 42.87% | 10,498 | 3.03% | 346,822 | 100.0% | Democratic gain |
| District 7 | 204,260 | 60.42% | 119,734 | 35.42% | 14,073 | 4.16% | 338,067 | 100.0% | Democratic hold |
| Total | 1,343,211 | 53.43% | 1,079,772 | 42.95% | 90,924 | 3.62% | 2,513,907 | 100.0% | |

## District 1

The 1st district is located in Central Colorado and includes most of the city of Denver. Incumbent Democrat Diana DeGette, who had represented the district since 1997, ran for re-election. She was re-elected with 68% of the vote in 2016. The district had a PVI of D+21.

### Democratic primary
#### Candidates
##### Nominee

* Diana DeGette, incumbent U.S. representative

##### Eliminated in primary

* Saira Rao, political activist, author, publisher, former Wall Street lawyer and television producer

##### Eliminated at convention

* David Sedbrook, self-employed travel industry worker (endorsed DeGette)

#### Endorsements
##### Labor unions

* AFL-CIO

##### Organizations

* NARAL Pro-Choice America

##### State legislators

* Joe Salazar, state representative and candidate for attorney general in 2018

##### Organizations

* Justice Democrats

##### Local officials

* Rafel Espinoza, Denver City Council member
* Susan-Barnes Gelt, Denver City Council member
* Debbie Ortega, Denver City Council member
* Chaz Tedesco, Adams County Commissioner

##### Individuals

* Tay Anderson, former candidate for Denver Public School Board of Education
* Denis Berckefeldt, former secretary of the Colorado Democratic Party and nominee for the 3rd district in 2002
* Buie Seawell, former Colorado Democratic Party chair
* Gary Shteyngart, author
* Andrew Yang, founder of Venture for America and 2020 US presidential candidate

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Diana DeGette (incumbent) | 91,102 | 68.2 |
| | Democratic | Saira Rao | 42,398 | 31.8 |
| Total votes | Total votes | Total votes | 133,500 | 100.0 |

### Republican primary
#### Candidates
##### Nominee

* Casper Stockham, Uber driver and nominee for this seat in 2016

##### Withdrawn

* John Field
* Jeremiah Vialpando

#### Results

Republican primary results, October 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Casper Stockham | 29,933 | 100.0 |
| Total votes | Total votes | Total votes | 29,933 | 100.0 |

### Libertarian primary
#### Candidates
##### Nominee

* Raymon Doane, tax examiner

### General election
#### Results

Colorado's 1st congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Diana DeGette (incumbent) | 272,886 | 73.8 |
| | Republican | Casper Stockham | 85,207 | 23.1 |
| | Libertarian | Raymon Doane | 11,600 | 3.1 |
| | Write-in | Write-in | 22 | 0.0 |
| Total votes | Total votes | Total votes | 369,715 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 2

The 2nd district is located in Northern Colorado and encompasses seven counties. Incumbent Democrat Jared Polis, who had represented the district since 2009, did not run re-election, instead running for Governor. He was re-elected with 57% of the vote in 2016. The district had a PVI of D+9.

### Democratic primary
#### Candidates
##### Nominee

* Joe Neguse, former regent for the University of Colorado, former executive director of the Colorado Department of Regulatory Agencies, and nominee for Secretary of State of Colorado in 2014

##### Eliminated in primary

* Mark Williams, businessman and former chair of the Boulder County Democratic Party

##### Withdrawn

* Howard Dotson, pastor and candidate for Loveland City Council in 2017
* Kristopher Larsen, mayor of Nederland
* Kenneth Toltz, businessman and nominee for the 6th district in 2000

##### Declined

* Kerry Donovan, state senator for the 5th District (running for re-election)
* Steve Fenberg, state senator
* Dan Gibbs, Summit County Commissioner and former state senator
* Elise Jones, Boulder County Commissioner
* Betsy Markey, former U.S. representative and nominee for state treasurer in 2014
* Shaun McGrath, former mayor of Boulder
* Shannon Watts, founder of Moms Demand Action

#### Endorsements
##### U.S. executive branch officials

* Joe Biden, former U.S. vice president
* Ray Mabus, former U.S. Secretary of the Navy
* Ken Salazar, former U.S. senator, Colorado Attorney General and U.S. Secretary of the Interior

##### U.S. senators

* Kamala Harris, U.S. senator from California

##### U.S. representatives

* Jim Clyburn, U.S. representative from South Carolina
* Marcia Fudge, U.S. representative from Ohio
* Gabby Giffords, former U.S. representative from Arizona
* Barbara Lee, U.S. representative from California
* Betsy Markey, former U.S. representative from Colorado
* Gregory Meeks, U.S. representative from New York
* Cedric Richmond, U.S. representative from Louisiana
* Terri Sewell, former U.S. representative from Alabama

##### Statewide officials

* Bernie Buescher, former Secretary of State of Colorado

##### State senators

* Polly Baca, former
* Bob Bacon, former
* Jeff Bridges
* Steve Fenberg, also co-founder of New Era Colorado with Neguse
* Rhonda Fields
* Joan Fitz-Gerald, former Senate president
* Leroy Garcia
* Lucia Guzman, minority leader
* Rollie Heath, former
* Matt Jones, also candidate for Boulder County commissioner, D3
* John Kefalas
* Andy Kerr
* Dominick Moreno
* Jeanne Nicholson, former
* Dan Pabon
* Dorothy Rupert, former
* Nancy Todd
* Angela Williams

##### State representatives

* Jeni Arndt
* KC Becker, house majority leader
* Janet Buckner
* Diane Mitsch Bush, also candidate for US Congress, D3
* James Coleman
* Daneya Esgar
* Mark Ferrandino, former speaker
* Mike Foote, candidate for District Attorney
* Alec Garnett
* Joann Ginal
* Matt Gray
* Millie Hamner
* Chris Hansen
* Leslie Herod
* Edie Hooton
* Dickey Lee Hullinghorst, former speaker
* Chris Kennedy
* Tracy Kraft-Tharp
* Claire Levy, former
* Alice Madden, former majority leader and candidate for CU Regent
* Jovan Melton
* Angie Paccione, former
* Brittany Pettersen
* Tom Plant, former
* Joe Rice, former
* Todd Saliman, former
* Jonathan Singer
* Wilma Webb, former state representative
* Faith Winter
* Ruth Wright, former

##### Labor unions

* AFL-CIO
* American Federation of Teachers
* Colorado Education Association
* Colorado Professional Fire Fighters
* Pipefitters #208
* Pipefitters #301
* Southwest Regional Council of Carpenters

##### Organizations

* Blue Rising PAC
* Congressional Progressive Caucus
* Council for a Livable World
* Democracy for America
* End Citizens United
* Giffords
* Humane Society of the United States
* League of Conservation Voters
* NARAL Pro-Choice America
* Planned Parenthood Action Fund

##### Mayors

* Christine Berg, mayor of Lafayette
* Kevin Burns, mayor of Dillon
* Leslie Durgen, former mayor of Boulder
* Suzanne Jones, mayor of Boulder
* Susan Kirkpatrick, former mayor of Fort Collins
* Kris Larsen, mayor of Nederland
* Jacki Marsh, mayor of Loveland
* Bob Muckle, mayor of Louisville
* Susan Osbourne, former mayor of Boulder
* Connie Sullivan, mayor of Lyons
* Will Toor, former mayor of Boulder
* Wellington Webb, former mayor of Denver

##### City councilors (Boulder)

* Robin Bohanan, former
* Jan Burton, former
* Macon Cowles, former
* Angelique Espinoza, former
* Jill Grano
* Sally Martin, former
* Francois Poinsatte, former
* Andrew Schoemaker, former
* Andy Schultehsis, former
* Sam Weaver
* Ken Wilson, former
* Bob Yates

##### City councilors (other)

* Richard Ball, Loveland
* Guyleen Castriota, Broomfield
* Bette Erickson, Broomfield
* Jamie Harkins, Lafayette
* Stan Jezierski, Broomfield
* Leah Johnson, Loveland
* Bob Overbeck, Fort Collins
* Deven Shaff, Broomfield
* Kristi Stephens, Fort Collins, former
* Sharron Tessier, Broomfield

##### County officials (Boulder)

* Joel Davidow, former Boulder County Democratic Party chair
* Cindy Domenico, commissioner
* Deb Gardner, commissioner
* Stan Garnett, former District Attorney
* Dan Gould, former Boulder County Democratic Party chair
* Josie Heath, former commissioner
* Bob Hullinghorst, former treasurer
* Elise Jones, commissioner
* Bean Pearlman, former commissioner
* Joe Pelle, sheriff
* Laura Spicer, former Boulder County Democratic Party vice chair
* Paul Weissman, treasurer

##### County officials (others)

* Beverly Breakstone, Summit County assessor
* Sandy Briggs, former Summit County Democratic Party chair
* Bruce Brown, district attorney, D5
* Thomas Davidson, Summit County commissioner
* Judy Enderle, former Broomfield County Democratic Party chair
* Dan Gibbs, Summit County commissioner
* Tim Mauch, Clear Creek County commissioner
* Tom Mehling, former Broomfield County Democratic Party chair
* Kathy Plomer, Adams 12 school board member
* Jill Ryan, Eagle County commissioner
* Karn Stiegelmeiser, Summit County commissioner
* Randy Wheelock, former Clear Creek county commissioner

##### Others

* Suzy Ageton, former Boulder deputy mayor
* Aaron Brocket, Boulder mayor pro tem
* Noah Finkelsteni, director of Colorado Center for STEM Learning
* Val Flores, state board of education member
* Mark Lacis, Superior Town trustee
* Neal Lurie, president of Center for Resource Conservation
* Sean Maher, former executive director of Boulder Small Business Development Center
* Nikhi Mankekar, deputy chairperson of Boulder Human Relations Commission
* Rich Pelletier, former deputy campaign manager for Bernie Sanders
* JoyAnn Ruscha, former Colorado political director for Bernie Sanders for president

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Neguse | 76,829 | 65.7 |
| | Democratic | Mark Williams | 40,044 | 34.3 |
| Total votes | Total votes | Total votes | 116,873 | 100.0 |

### Republican primary
#### Candidates
##### Nominee

* Peter Yu, businessman

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Peter Yu | 45,970 | 100.0 |
| Total votes | Total votes | Total votes | 45,970 | 100.0 |

### Libertarian primary
#### Candidates
##### Nominee

* Roger Barris

##### Withdrawn

* Todd Mitchem

### Independents
#### Candidates

* Nick Thomas

### General election
#### Results

Colorado's 2nd congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Joe Neguse | 259,608 | 60.3 |
| | Republican | Peter Yu | 144,901 | 33.6 |
| | Independent | Nick Thomas | 16,356 | 3.8 |
| | Libertarian | Roger Barris | 9,749 | 2.3 |
| | Green | Kevin Alumbaugh (write-in) | 151 | 0.0 |
| Total votes | Total votes | Total votes | 430,765 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 3

The 3rd district is located in Western and Southern Colorado and includes a large number of sparsely populated counties and the city of Grand Junction. Incumbent Republican Scott Tipton, who had represented the district since 2011, ran for re-election. He was re-elected with 55% of the vote in 2016. The district had a PVI of R+6.

### Republican primary
#### Candidates
##### Nominee

* Scott Tipton, incumbent U.S. representative

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Scott Tipton (incumbent) | 66,854 | 100.0 |
| Total votes | Total votes | Total votes | 66,854 | 100.0 |

### Democratic primary

This was one of 80 Republican-held House districts targeted by the Democratic Congressional Campaign Committee in 2018.

#### Candidates
##### Nominee

* Diane Mitsch Bush, former state representative

##### Eliminated in primary

* Karl Hanlon, Glenwood Springs city attorney
* Arn Menconi, former Eagle County commissioner

##### Withdrawn

* Chris Kennedy, Grand Junction city councilman

##### Declined

* Kerry Donovan, state senator for the 5th District (running for re-election)

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Diane Mitsch Bush | 44,809 | 64.1 |
| | Democratic | Karl Hanlon | 19,368 | 27.7 |
| | Democratic | Arn Menconi | 5,754 | 8.2 |
| Total votes | Total votes | Total votes | 69,931 | 100.0 |

### General election
#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Scott Tipton (R) | Diane Mitsch Bush (D) | Other | Undecided |
| JMC Analytics/Bold Blue Campaigns | October 27 – November 2, 2018 | 500 | ± 4.5% | 46% | 41% | 5% | 7% |
| Change Research (D) | October 27–29, 2018 | 485 | – | 53% | 38% | – | 9% |

#### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Likely R | November 5, 2018 |
| Inside Elections | Safe R | November 5, 2018 |
| Sabato's Crystal Ball | Lean R | November 5, 2018 |
| RCP | Likely R | November 5, 2018 |
| Daily Kos | Likely R | November 5, 2018 |
| 538 | Likely R | November 7, 2018 |
| CNN | Safe R | October 31, 2018 |
| Politico | Likely R | November 4, 2018 |

#### Results

Colorado's 3rd congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Scott Tipton (incumbent) | 173,205 | 51.5 |
| | Democratic | Diane Mitsch Bush | 146,426 | 43.6 |
| | Independent | Mary Malarsie | 10,831 | 3.2 |
| | Libertarian | Gaylon Kent | 5,727 | 1.7 |
| | Green | Gary Swing (write-in) | 9 | 0.0 |
| | Write-in | Write-in | 3 | 0.0 |
| Total votes | Total votes | Total votes | 336,201 | 100 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 4

The 4th district is located in Eastern Colorado and includes numerous sparsely populated counties. Incumbent Republican Ken Buck, who had represented the district since 2015, ran for re-election. He was re-elected with 64% of the vote in 2016. The district had a PVI of R+13.

### Republican primary
#### Candidates
##### Nominee

* Ken Buck, incumbent U.S. representative

##### Eliminated at convention

* Jim Gunning, former mayor of Lone Tree

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Ken Buck (incumbent) | 85,290 | 100.0 |
| Total votes | Total votes | Total votes | 85,290 | 100.0 |

### Democratic primary
#### Candidates
##### Nominee

* Karen McCormick, veterinarian

##### Eliminated in primary

* Chase Kohne, veteran, veterinarian and small business owner

##### Eliminated at convention

* Larry Germanson
* Richard Weil

#### Endorsements
##### Organizations

* Blue Rising PAC

##### Newspapers

* Greeley Tribune

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Karen McCormick | 37,120 | 64.7 |
| | Democratic | Chase Kohne | 20,269 | 35.3 |
| Total votes | Total votes | Total votes | 57,389 | 100.0 |

### General election
#### Results

Colorado's 4th congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Ken Buck (incumbent) | 224,038 | 60.6 |
| | Democratic | Karen McCormick | 145,544 | 39.4 |
| | Green | John Vigil (write-in) | 26 | 0.0 |
| | Write-in | Write-in | 12 | 0.0 |
| Total votes | Total votes | Total votes | 369,620 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 5

The 5th district is located in Central Colorado and includes Fremont, El Paso, Teller and Chaffee counties and the city of Colorado Springs. Incumbent Republican Doug Lamborn, who had represented the district since 2007, ran for re-election. He was re-elected with 62% of the vote in 2016. The district had a PVI of R+14.

### Republican primary
#### Candidates
##### Nominee

* Doug Lamborn, incumbent U.S. representative

##### Eliminated in primary

* Darryl Glenn, El Paso County Commissioner and nominee for the U.S. Senate in 2016
* Owen Hill, state senator
* Bill Rhea, retired Texas judge
* Tyler Stevens, former Green Mountain Falls mayor

#### Withdrawn

* Tom Strand, Colorado Springs City Council member

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Darryl Glenn | Owen Hill | Doug Lamborn | Bill Rhea | Tyler Stevens | Undecided |
| Magellan Strategies | May 20–21, 2018 | 519 | ± 4.3% | 27% | 10% | 37% | 2% | 3% | 21% |

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug Lamborn (incumbent) | 54,974 | 52.2 |
| | Republican | Darryl Glenn | 21,479 | 20.4 |
| | Republican | Owen Hill | 19,141 | 18.2 |
| | Republican | Bill Rhea | 6,167 | 5.9 |
| | Republican | Tyler Stevens | 3,643 | 3.5 |
| Total votes | Total votes | Total votes | 105,404 | 100.0 |

### Democratic primary
#### Candidates
##### Nominee

* Stephany Rose Spaulding, activist, public commentator, pastor of Ebenezer Baptist Church in Colorado Springs, and associate professor of Women's and Ethnic Studies at the University of Colorado Colorado Springs

##### Eliminated in primary

* Marcus Murphy (write-in)

##### Eliminated at convention

* Betty Field, social worker and former executive director for the Black Hills Center for Equality
* Lori Furstenberg
* Kimberly Sugarmen

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Stephany Rose Spaulding | 45,466 | 99.9 |
| | Write-in | Write-in | 38 | 0.1 |
| Total votes | Total votes | Total votes | 45,504 | 100.0 |

### Libertarian primary
#### Candidates
##### Nominee

* Douglas Randall

### General election
#### Results

Colorado's 5th congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Doug Lamborn (incumbent) | 184,002 | 57.0 |
| | Democratic | Stephany Rose Spaulding | 126,848 | 39.3 |
| | Libertarian | Douglas Randall | 11,795 | 3.7 |
| | Unity | John Croom (write-in) | 16 | 0.0 |
| | Write-in | Write-in | 55 | 0.0 |
| Total votes | Total votes | Total votes | 322,716 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 6

The 6th district is located in Central Colorado and surrounds the city of Denver from the east, including the city of Aurora. Incumbent Republican Mike Coffman, who had represented the district since 2009, ran for re-election. He was re-elected with 51% of the vote in 2016. The district had a PVI of D+2.

### Republican primary
#### Candidates
##### Nominee

* Mike Coffman, incumbent U.S. representative

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Coffman (incumbent) | 56,703 | 100.0 |
| Total votes | Total votes | Total votes | 56,703 | 100.0 |

### Democratic primary

This was one of 80 Republican-held House districts targeted by the Democratic Congressional Campaign Committee in 2018.

#### Candidates
##### Nominee

* Jason Crow, attorney

##### Eliminated in primary

* Levi Tillemann, businessman

##### Withdrawn

* David Aarestad, attorney and former candidate for the Cherry Creek School District
* Gabriel McArthur, Bernie Sanders delegate to the 2016 Democratic National Convention (endorsed Tillemann)

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jason Crow | 49,851 | 65.9 |
| | Democratic | Levi Tillemann | 25,757 | 34.1 |
| Total votes | Total votes | Total votes | 75,608 | 100.0 |

### General election
#### Endorsements
##### Organizations

* Citizens for Responsible Energy Solutions

##### Newspapers

* The Denver Post

##### Organizations

* Democratic Congressional Campaign Committee "Red to Blue" Program

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Mike Coffman (R) | Jason Crow (D) | Undecided |
| NYT Upshot/Siena College | October 13–17, 2018 | 506 | ± 4.5% | 38% | 47% | 9% |
| Normington, Petts & Associates (D) | September 18–23, 2018 | 400 | ± 4.9% | 38% | 49% | 13% |
| NYT Upshot/Siena College | September 12–14, 2018 | 500 | ± 4.8% | 40% | 51% | 9% |
| The Tarrance Group (R-Coffman) | September 11–13, 2018 | 400 | ± 4.9% | 45% | 46% | 9% |
| IMGE Insights (R) | July 9–12, 2018 | 400 | – | 45% | 45% | 10% |
| Global Strategy Group (D-Crow) | July 11–17, 2018 | 506 | ± 4.4% | 45% | 47% | 8% |
| Normington, Petts & Associates (D) | July 9–11, 2018 | 400 | – | 44% | 41% | 15% |
| Public Policy Polling (D) | February 15–18, 2018 | 751 | ± 3.6% | 39% | 44% | 17% |
| Public Policy Polling (D) | October 5–8, 2017 | 742 | ± 3.6% | 43% | 36% | 21% |

#### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Lean D (flip) | November 5, 2018 |
| Inside Elections | Tilt D (flip) | November 5, 2018 |
| Sabato's Crystal Ball | Lean D (flip) | November 5, 2018 |
| RCP | Lean D (flip) | November 5, 2018 |
| Daily Kos | Lean D (flip) | November 5, 2018 |
| 538 | Likely D (flip) | November 7, 2018 |
| CNN | Lean D (flip) | October 31, 2018 |
| Politico | Lean D (flip) | November 4, 2018 |

#### Results

Colorado's 6th congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jason Crow | 187,639 | 54.1 |
| | Republican | Mike Coffman (incumbent) | 148,685 | 42.9 |
| | Libertarian | Kat Martin | 5,886 | 1.7 |
| | Unity | Dan Chapin | 4,607 | 1.3 |
| | Green | Christopher Allen (write-in) | 5 | 0.0 |
| Total votes | Total votes | Total votes | 346,822 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

## District 7

The 7th district is located in Central Colorado, to the north and west of Denver and includes the cities of Thornton and Westminster and most of Lakewood. Incumbent Democrat Ed Perlmutter, who had represented the district since 2007, ran for re-election. He was re-elected with 55% of the vote in 2016. The district had a PVI of D+6.

### Democratic primary

Perlmutter announced a run for governor, but later withdrew from that race. He later announced that he would not run for re-election. However, on August 21, 2017, he announced that he had changed his mind.

#### Candidates
##### Nominee

* Ed Perlmutter, incumbent U.S. representative

##### Withdrawn

* Daniel Baer, former U.S. ambassador to the Organization for Security and Co-operation in Europe
* Andy Kerr, state senator
* Dominick Moreno, state senator
* Brittany Pettersen, state representative

#### Results

Democratic primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ed Perlmutter (incumbent) | 81,991 | 100.0 |
| Total votes | Total votes | Total votes | 81,991 | 100.0 |

### Republican primary

Colorado's 7th district was included on the initial list of Democratic-held seats being targeted by the National Republican Congressional Committee in 2018.

#### Candidates
##### Nominee

* Mark Barrington, Lakewood businessman

##### Declined

* Don Ytterberg, former chair of the Jefferson County Republican Party, former vice chair of the Colorado Republican Party and nominee for this seat in 2014

#### Results

Republican primary results, Colorado 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Mark Barrington | 46,028 | 100.0 |
| Total votes | Total votes | Total votes | 46,028 | 100.0 |

### Independents
#### Candidates

* Nathan Clay

### General election
#### Results

Colorado's 7th congressional district results, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Ed Perlmutter (incumbent) | 204,260 | 60.4 |
| | Republican | Mark Barrington | 119,734 | 35.4 |
| | Libertarian | Jennifer Nackerud | 14,012 | 4.1 |
| | Green | Michael Haughey (write-in) | 16 | 0.0 |
| | Write-in | Write-in | 45 | 0.0 |
| Total votes | Total votes | Total votes | 338,067 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |