# 2018 United States House of Representatives elections in Illinois

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The 2018 United States House of Representatives elections in Illinois were held on November 6, 2018, to elect U.S. representatives, one from each of the state's eighteen congressional districts.
The primaries for all parties were held on March 20, 2018. The state congressional delegation changed from an 11–7 Democratic majority to a 13–5 Democratic majority.

## Overview
### Statewide

Popular vote
Democratic
60.46%
Republican
38.65%
Other
0.89% :
House seats
Democratic
72.22%
Republican
27.78% :

### By district

Results of the 2018 United States House of Representatives elections in Illinois by district:
| District | Democratic | Democratic | Republican | Republican | Others | Others | Total | Total | Result |
| District | Votes | % | Votes | % | Votes | % | Votes | % | Result |
| District 1 | 189,560 | 73.51% | 50,960 | 19.76% | 17,365 | 6.73% | 257,885 | 100.0% | Democratic hold |
| District 2 | 190,684 | 81.06% | 44,567 | 18.94% | 0 | 0.00% | 235,251 | 100.0% | Democratic hold |
| District 3 | 163,053 | 73.01% | 57,885 | 25.92% | 2,396 | 1.07% | 223,334 | 100.0% | Democratic hold |
| District 4 | 143,895 | 86.59% | 22,294 | 13.41% | 0 | 0.00% | 166,189 | 100.0% | Democratic hold |
| District 5 | 213,992 | 76.66% | 65,134 | 23.34% | 5 | 0.00% | 279,131 | 100.0% | Democratic hold |
| District 6 | 169,001 | 53.58% | 146,445 | 46.42% | 0 | 0.00% | 315,446 | 100.0% | Democratic gain |
| District 7 | 215,746 | 87.62% | 30,497 | 12.38% | 0 | 0.00% | 246,243 | 100.0% | Democratic hold |
| District 8 | 130,054 | 65.97% | 67,073 | 34.03% | 0 | 0.00% | 197,127 | 100.0% | Democratic hold |
| District 9 | 213,368 | 73.49% | 76,983 | 26.51% | 0 | 0.00% | 290,351 | 100.0% | Democratic hold |
| District 10 | 156,540 | 65.59% | 82,124 | 34.41% | 0 | 0.00% | 238,664 | 100.0% | Democratic hold |
| District 11 | 145,407 | 63.84% | 82,358 | 36.16% | 0 | 0.00% | 227,765 | 100.0% | Democratic hold |
| District 12 | 118,724 | 45.39% | 134,884 | 51.57% | 7,935 | 3.03% | 261,543 | 100.0% | Republican hold |
| District 13 | 134,458 | 49.62% | 136,516 | 50.38% | 7 | 0.00% | 270,981 | 100.0% | Republican hold |
| District 14 | 156,035 | 52.50% | 141,164 | 47.50% | 0 | 0.00% | 297,199 | 100.0% | Democratic gain |
| District 15 | 74,309 | 29.07% | 181,294 | 70.93% | 5 | 0.00% | 255,608 | 100.0% | Republican hold |
| District 16 | 104,569 | 40.88% | 151,254 | 59.12% | 2 | 0.00% | 255,825 | 100.0% | Republican hold |
| District 17 | 142,659 | 62.09% | 87,090 | 37.91% | 0 | 0.00% | 229,749 | 100.0% | Democratic hold |
| District 18 | 95,486 | 32.77% | 195,927 | 67.23% | 0 | 0.00% | 291,413 | 100.0% | Republican hold |
| Total | 2,757,540 | 60.74% | 1,754,449 | 38.65% | 27,715 | 0.61% | 4,539,704 | 100.0% | |

## District 1

Incumbent Democrat Bobby Rush, who had represented the district since 1993, ran for re-election. He was re-elected with 74.1% of the vote in 2016. The district had a PVI of D+27.

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

* Bobby Rush, incumbent U.S. Representative

##### Withdrew

* Howard Brookins, Chicago alderman for the 21st Ward and candidate for this seat in 2016

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Bobby Rush (incumbent) | 104,114 | 100.0 |
| Total votes | Total votes | Total votes | 104,114 | 100.0 |

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

* Jimmy Lee Tillman, II, son of former Chicago alderman Dorothy Tillman, nominee for this seat in 2014 and candidate in 2016

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Jimmy Lee Tillman, II | 15,389 | 100.0 |
| Total votes | Total votes | Total votes | 15,389 | 100.0 |

### General election
#### Results

Illinois's 1st congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Bobby Rush (incumbent) | 189,560 | 73.5 |
| | Republican | Jimmy Lee Tillman, II | 50,960 | 19.8 |
| | Independent | Thomas Rudbeck | 17,365 | 6.7 |
| Total votes | Total votes | Total votes | 257,885 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 2

Incumbent Democrat Robin Kelly, who had represented the district since 2013, ran for re-election. She was re-elected with 79.8% of the vote in 2016. The district had a PVI of D+29.

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

* Robin Kelly, incumbent U.S. Representative

##### Eliminated in primary

* Marcus Lewis, postal worker, independent candidate for this seat in 2012 & 2013 and Democratic candidate in 2014 & 2016

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Robin Kelly (incumbent) | 80,659 | 82.1 |
| | Democratic | Marcus Lewis | 17,640 | 17.9 |
| Total votes | Total votes | Total votes | 98,299 | 100.0 |

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

* David Merkle

##### Eliminated in primary

* Patrick Harmon
* John Morrow, nominee for this seat in 2016

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | David Merkle | 4,963 | 36.6 |
| | Republican | Patrick Harmon | 4,810 | 35.5 |
| | Republican | John Morrow | 3,790 | 27.9 |
| Total votes | Total votes | Total votes | 13,563 | 100.0 |

### General election
#### Results

Illinois's 2nd congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Robin Kelly (incumbent) | 190,684 | 81.1 |
| | Republican | David Merkle | 44,567 | 18.9 |
| Total votes | Total votes | Total votes | 235,251 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 3

Incumbent Democrat Dan Lipinski, who had represented the district since 2005, ran for re-election. He was re-elected with 100.0% of the vote in 2016. The district had a PVI of D+6.

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

* Dan Lipinski, incumbent U.S. Representative

##### Eliminated in primary

* Marie Newman, businesswoman and activist

#### Endorsements

U.S. senators
* Ted Cruz, U.S. Senator from Texas (Republican)
State legislators
* Steven Landek, state senator
Labor unions
* International Association of Fire Fighters
* International Association of Machinists and Aerospace Workers
* International Association of Sheet Metal, Air, Rail and Transportation Workers
* International Brotherhood of Boilermakers
* Transport Workers Union of America
* United Steelworkers
Organizations
* Susan B. Anthony List
Newspapers
* Chicago Sun-Times
* Chicago Tribune
Local officials
* Jeff Tobolski, member of the Cook County Board of Commissioners from the 16th district.
U.S. senators
* Kirsten Gillibrand, United States Senator from New York
* Bernie Sanders, Independent United States Senator from Vermont, 2016 presidential candidate
U.S. representatives
* Raúl Grijalva, Representative from Arizona's 3rd congressional district
* Luis Gutiérrez, Representative from Illinois's 4th congressional district
* Pramila Jayapal, Representative from Washington's 7th congressional district
* Ro Khanna, Representative from California's 17th congressional district
* Mark Pocan, Representative from Wisconsin's 2nd congressional district
* Jan Schakowsky, Representative from Illinois's 9th congressional district
State legislators
* Toi Hutchinson (D-Olympia Fields), State Senator
* Laura Fine (D-Glenview), Representative
* Theresa Mah, (D-Chicago), Representative
* Ann Williams (D-Chicago), Representative
Labor unions
* American Postal Workers Union local #6266
* Illinois Federation of Teachers
* National Nurses United
* Service Employees International Union of Illinois
Organizations
* Citizen Action/Illinois
* Daily Kos
* Democracy for America
* EMILY's List
* Feminist Majority
* Human Rights Campaign
* Indivisible Brookfield
* Indivisible Chicago – South Side
* Indivisible LG/LGP
* Indivisible Western Springs
* J Street PAC
* Justice Democrats
* LPAC
* MoveOn.org
* NARAL Pro-Choice America
* National Association of Social Workers
* National Organization for Women
* National Women's Political Caucus
* Northside Democracy for America
* Our Revolution
* Our Revolution Illinois
* Planned Parenthood Action Fund
* Progressive Change Campaign Committee
Local officials
* Ameya Pawar, Chicago Alderman for the 47th ward, former gubernatorial candidate
* Toni Preckwinkle, President of the Cook County Board
Individuals
* Gloria Steinem, feminist activist

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Dan Lipinski | Marie Newman | Undecided |
| Public Policy Polling (D) | February 27–28, 2018 | 648 | ± 3.9% | 43% | 41% | 15% |
| Normington, Petts & Associates (D) | October 16–19, 2017 | 400 | ± 4.9% | 49% | 18% | 33% |

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dan Lipinski (incumbent) | 48,675 | 51.1 |
| | Democratic | Marie Newman | 46,530 | 48.9 |
| Total votes | Total votes | Total votes | 95,205 | 100.0 |

### Republican primary

Jewish Republicans called for Cook County Republican chairman Sean Morrison to resign for failing to recruit any candidate to oppose Art Jones, a self-professed Nazi, Holocaust denier, white nationalist, and white supremacist who became the Republican nominee.

#### Candidates
##### Nominee

* Arthur Jones, former chair of the American Nazi Party, holocaust denier, and white supremacist

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Arthur Jones | 20,681 | 100.0 |
| Total votes | Total votes | Total votes | 20,681 | 100.0 |

### Other candidates
#### Write-in
##### Declared

* Justin Hanson, lawyer and Republican former congressional staffer
* Richard Mayers, perennial candidate and alleged white supremacist congressional candidate in 2000, 2002, 2008, and 2016; 1998 State House candidate; 1993 Berwyn city clerk and city treasurer candidate
* Kenneth Yerkes, dentist

##### Declined

* Christopher Reilly, Palos Township trustee

### General election
#### Results

Illinois's 3rd congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Dan Lipinski (incumbent) | 163,053 | 73.0 |
| | Republican | Arthur Jones | 57,885 | 25.9 |
| | Independent | Justin Hanson (write-in) | 1,353 | 0.6 |
| | Independent | Kenneth Yerkes (write-in) | 1,039 | 0.5 |
| | Independent | Richard Mayers (write-in) | 4 | 0.0 |
| Total votes | Total votes | Total votes | 223,334 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 4

Incumbent Democrat Luis Gutiérrez, who had represented the district since 1993, ran for re-election. He was re-elected with 79.8% of the vote in 2016. The district had a PVI of D+33.

### Democratic primary

A day after filing petitions to run for reelection, Gutierrez announced he would not seek re-election in 2018 and retire at the end of his current term.
Gutierrez's announcement led multiple Democrats to begin circulating petitions. Jesús "Chuy" García, a member of the Cook County Board of Commissioners, Carlos Ramirez-Rosa, and Proco Joe Moreno, both members of the Chicago City Council, circulated petitions for the nomination. Ramirez-Rosa and Moreno withdrew. Gutiérrez endorsed García.
On November 28, 2017, Richard Gonzalez filed to run for the Democratic nomination.

#### Candidates
##### Nominee

* Jesús "Chuy" García, Cook County commissioner for the 7th district

##### Eliminated in primary

* Sol Flores, founding executive director of La Casa Norte
* Richard Gonzalez, Chicago Police Department sergeant

##### Withdrew

* Raymond Lopez, Chicago city councilman for the 15th ward
* Proco Joe Moreno, Chicago city councilman for the 1st ward
* Carlos Ramirez-Rosa, Chicago city councilman for the 35th ward (endorsed Jesús "Chuy" García)

#### Endorsements

U.S. senators
* Kirsten Gillibrand, U.S. Senator from New York
Organizations
* EMILY's List
Newspapers
* Chicago Tribune
Local officials
* Ameya Pawar, Chicago alderman
U.S. senators
* Bernie Sanders, U.S. Senator from Vermont and 2016 presidential candidate
U.S. representatives
* Luis Gutiérrez, retiring U.S. Representative (IL-4)
State legislators
* Nina Turner, former member of the Ohio Senate and President of Our Revolution
Organizations
* Our Revolution
Newspapers
* Chicago Sun-Times
Local officials
* Carlos Ramirez-Rosa, member of the Chicago City Council from the 35th ward and former U.S. Representative (IL-4) candidate
Individuals
* Christopher G. Kennedy, businessman and 2018 Illinois gubernatorial candidate
* J. B. Pritzker, businessman and 2018 Democratic Illinois gubernatorial nominee

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Jesus "Chuy" García | Joe Moreno | Sol Flores | Carlos Ramirez-Rosa | Other | Undecided |
| Garin Hart Yang Research Group (D) | January 18–21, 2018 | 400 | ± 5.0% | 59% | 8% | 6% | – | 8% | 19% |
| Public Policy Polling (D) | December 13–14, 2017 | 412 | ± 4.8% | 53% | – | – | 7% | – | 20% |

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jesús "Chuy" García | 49,631 | 66.4 |
| | Democratic | Sol Flores | 16,398 | 21.6 |
| | Democratic | Richard Gonzalez | 8,921 | 12.0 |
| Total votes | Total votes | Total votes | 74,950 | 100.0 |

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

* Mark Lorch

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Mark Lorch | 5,805 | 100.0 |
| Total votes | Total votes | Total votes | 5,805 | 100.0 |

### General election
#### Results

Illinois's 4th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jesús "Chuy" García | 143,895 | 86.6 |
| | Republican | Mark Lorch | 22,294 | 13.4 |
| Total votes | Total votes | Total votes | 166,189 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 5

Incumbent Democrat Mike Quigley, who had represented the district since 2009, ran for re-election. He was re-elected with 67.8% of the vote in 2016. The district had a PVI of D+20.
Per the Illinois Board of Elections, four Democrats and one Republican filed to run in the 5th congressional district.

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

* Mike Quigley, incumbent U.S. Representative

##### Eliminated in primary

* Sameena Mustafa
* Steven J. Schwartzberg
* Ben Wolf, former FBI agent

#### Endorsements

Organizations
* Justice Democrats

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Quigley (incumbent) | 66,254 | 62.5 |
| | Democratic | Sameena Mustafa | 25,591 | 24.1 |
| | Democratic | Ben Wolf | 10,032 | 9.5 |
| | Democratic | Steven Schwartzberg | 4,196 | 4.0 |
| Total votes | Total votes | Total votes | 106,073 | 100.0 |

### Candidates
#### Nominee

* Tom Hanson

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Tom Hanson | 18,837 | 100.0 |
| Total votes | Total votes | Total votes | 18,837 | 100.0 |

### General election
#### Results

Illinois's 5th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Mike Quigley (incumbent) | 213,992 | 76.7 |
| | Republican | Tom Hanson | 65,134 | 23.3 |
| | Independent | Frank Rowder (write-in) | 5 | 0.0 |
| Total votes | Total votes | Total votes | 279,131 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 6

Incumbent Republican Peter Roskam, who had represented the district since 2007, ran for re-election. He was re-elected with 59.2% of the vote in 2016, while Democrat Hillary Clinton defeated Republican Donald Trump in the presidential election by a seven-point margin in that district. The district had a PVI of R+2.

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

* Peter Roskam, incumbent U.S. Representative

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Peter Roskam (incumbent) | 56,544 | 100.0 |
| Total votes | Total votes | Total votes | 56,544 | 100.0 |

### Democratic primary

Clinton's victory in the historically Republican district led to a large amount of Democratic interest. On January 30, 2017, the Democratic Congressional Campaign Committee announced the 6th as one of three Illinois targets.

#### Candidates
##### Nominee

* Sean Casten, scientist and former energy business owner

##### Eliminated in primary

* Becky Anderson Wilkins, Naperville city council member
* Carole Cheney, former chief of staff to U.S. Representative Bill Foster and candidate for Illinois House of Representatives in 2012
* Amanda Howland, College of Lake County trustee, nominee for this seat in 2016, candidate for Illinois State Senate in 2012 and candidate for Illinois House of Representatives in 2006 & 2008
* Ryan Huffman, data analyst
* Kelly Mazeski, Barrington Hills planning commissioner and candidate for Illinois State Senate in 2016
* Jennifer Zordani, regulatory attorney and former non-profit president

##### Withdrawn

* Grace Haaf, business owner and former CIA cyber security analyst
* Suzyn Price, former Naperville Board of Education member

##### Declined

* Geoffrey Petzel, candidate for this seat in 2012
* Jason Snelson, restaurant operations manager
* Austin Songer, U.S. Navy veteran

#### Endorsements

U.S. representatives
* Bill Foster, U.S. Representative, Illinois's 11th congressional district
U.S. representatives
* Cheri Bustos, U.S. Representative, Illinois's 17th congressional district
* Jan Schakowsky, U.S. Representative, Illinois's 9th congressional district
Organizations
* EMILY's List
* NARAL Pro-Choice America
Newspapers
* Chicago Sun-Times

#### Forum

2018 Illinois's 6th congressional district democratic primary candidate forum :
| No. | Date | Host | Moderator | Link | Democratic | Democratic | Democratic | Democratic | Democratic | Democratic | Democratic |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | | | | | | | |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Sean Casten | Carole Cheney | Amanda Howland | Ryan Huffman | Kelly Mazeski | Becky Anderson Wilkins | Jennifer Zordani |
| 1 | Feb. 28, 2018 | League of Women Voters of Glen Ellyn | Jan Dorner | | P | P | P | P | P | P | P |

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Sean Casten | 19,774 | 29.5 |
| | Democratic | Kelly Mazeski | 17,984 | 26.8 |
| | Democratic | Carole Cheney | 11,663 | 17.4 |
| | Democratic | Amanda Howland | 8,483 | 12.7 |
| | Democratic | Becky Anderson Wilkins | 4,001 | 6.0 |
| | Democratic | Jennifer Zordani | 2,743 | 4.1 |
| | Democratic | Ryan Huffman | 2,365 | 3.5 |
| Total votes | Total votes | Total votes | 67,013 | 100.0 |

### General election
#### Forum

* Complete radio debate (2 parts): July 1, 2018
2018 Illinois's 6th congressional district candidate forum :
| No. | Date | Host | Moderator | Link | Republican | Democratic |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | | |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Peter Roskam | Sean Casten |
| 2 | Jul. 26, 2018 | Lincoln Forum WFLD | Mike Flannery | | P | P |

#### Endorsements

U.S. Executive Branch officials
* Barack Obama, 44th President of the United States

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Peter Roskam (R) | Sean Casten (D) | Undecided |
| NYT Upshot/Siena College | October 20–26, 2018 | 497 | ± 4.7% | 44% | 46% | 10% |
| Garin-Hart-Yang Research Group (D) | September 29 – October 1, 2018 | 400 | ± 4.9% | 44% | 49% | 7% |
| Garin-Hart-Yang Research Group (D) | September 8–10, 2018 | 402 | ± 4.9% | 44% | 47% | 9% |
| NYT Upshot/Siena College | September 4–6, 2018 | 512 | ± 4.7% | 45% | 44% | 11% |
| Victory Research (R) | July 23–25, 2018 | 600 | ± 4.0% | 44% | 37% | 19% |
| Garin-Hart-Yang Research Group (D) | April 21–23, 2018 | 401 | ± 4.9% | 45% | 44% | 11% |
| Poll source | Date(s) administered | Sample size | Margin of error | Peter Roskam (R) | Democratic opponent (D) | Undecided |
| Public Policy Polling (D) | November 9–10, 2017 | 599 | ± 4.0% | 41% | 51% | 8% |

#### 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 | Tossup | November 5, 2018 |
| Daily Kos | Tossup | November 5, 2018 |
| 538 | Tossup | November 7, 2018 |
| CNN | Tossup | October 31, 2018 |
| Politico | Tossup | November 4, 2018 |

#### Results

Illinois's 6th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Sean Casten | 169,001 | 53.6 |
| | Republican | Peter Roskam (incumbent) | 146,445 | 46.4 |
| Majority | Majority | Majority | 22,556 | 7.2 |
| Total votes | Total votes | Total votes | 315,446 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

## District 7

Incumbent Democrat Danny K. Davis, who had represented the district since 1997, ran for re-election. He was re-elected with 84.2% of the vote in 2016. The district had a PVI of D+38.

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

* Danny K. Davis, incumbent U.S. Representative

##### Eliminated in primary

* Anthony Clark, high school teacher

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Danny K. Davis (incumbent) | 81,570 | 73.9 |
| | Democratic | Anthony Clark | 28,867 | 26.1 |
| Total votes | Total votes | Total votes | 110,437 | 100.0 |

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

* Craig Cameron

##### Eliminated in primary

* Jeffrey Leef

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Craig Cameron | 3,706 | 56.3 |
| | Republican | Jeffrey Leef | 2,873 | 43.7 |
| Total votes | Total votes | Total votes | 6,579 | 100.0 |

### General election
#### Results

Illinois's 7th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Danny K. Davis (incumbent) | 215,746 | 87.6 |
| | Republican | Craig Cameron | 30,497 | 12.4 |
| Total votes | Total votes | Total votes | 246,243 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 8

Incumbent Democrat Raja Krishnamoorthi, who had represented the district since 2017, ran for re-election. He was elected with 58.3% of the vote in 2016. The district had a PVI of D+8.

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

* Raja Krishnamoorthi, incumbent U.S. Representative

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Raja Krishnamoorthi (incumbent) | 44,042 | 100.0 |
| Total votes | Total votes | Total votes | 44,042 | 100.0 |

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

* Jitendra "JD" Diganvker, entrepreneur

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Jitendra "JD" Diganvker | 25,448 | 100.0 |
| Total votes | Total votes | Total votes | 25,448 | 100.0 |

### General election
#### Results

Illinois's 8th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Raja Krishnamoorthi (incumbent) | 130,054 | 66.0 |
| | Republican | Jitendra "JD" Diganvker | 67,073 | 34.0 |
| Total votes | Total votes | Total votes | 197,127 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 9

Incumbent Democrat Jan Schakowsky, who had represented the district since 1999, ran for re-election. She was re-elected with 66.5% of the vote in 2016. The district had a PVI of D+18.

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

* Jan Schakowsky, incumbent U.S. Representative

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jan Schakowsky (incumbent) | 108,417 | 100.0 |
| Total votes | Total votes | Total votes | 108,417 | 100.0 |

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

* John D. Elleson, pastor

##### Eliminated in primary

* Sargis Sangari, U.S. Army veteran
* Maxwell Rice
* D. Vincent Thomas Jr., U.S. Coast Guard veteran

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | John Elleson | 10,476 | 40.4 |
| | Republican | Sargis Sangari | 7,954 | 30.7 |
| | Republican | D. Vincent Thomas | 4,886 | 18.8 |
| | Republican | Maxwell Rice | 2,634 | 10.2 |
| Total votes | Total votes | Total votes | 25,950 | 100.0 |

### General election
#### Results

Illinois's 9th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Jan Schakowsky (incumbent) | 213,368 | 73.5 |
| | Republican | John Elleson | 76,983 | 26.5 |
| Total votes | Total votes | Total votes | 290,351 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 10

Incumbent Democrat Brad Schneider, who had represented the district since 2017 and he previously between 2013 and 2015, ran for re-election. He was reelected with 52.6% of the vote in 2016. The district had a PVI of D+10.

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

* Brad Schneider, incumbent U.S. Representative

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brad Schneider (incumbent) | 58,195 | 100.0 |
| Total votes | Total votes | Total votes | 58,195 | 100.0 |

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

* Douglas Bennett, computer engineer

##### Eliminated in primary

* Sapan Shah, physician
* Jeremy Wynes, midwest director of the American Israel Public Affairs Committee and the Republican Jewish Coalition

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Douglas Bennett | 11,026 | 36.2 |
| | Republican | Jeremy Wynes | 10,556 | 34.7 |
| | Republican | Sapan Shah | 8,841 | 29.1 |
| | Republican | Aloys Rutagwibira | 10 | 0.0 |
| Total votes | Total votes | Total votes | 30,433 | 100.0 |

### General election
#### Results

Illinois's 10th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brad Schneider (incumbent) | 156,540 | 65.6 |
| | Republican | Douglas Bennett | 82,124 | 34.4 |
| Total votes | Total votes | Total votes | 238,664 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 11

Incumbent Democrat Bill Foster, who had represented the district since 2013 and had previously served the 14th district from 2008 to 2011, ran for re-election. He was re-elected with 60.4% of the vote in 2016. The district had a PVI of D+9.

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

* Bill Foster, incumbent U.S. Representative

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Bill Foster (incumbent) | 49,762 | 100.0 |
| Total votes | Total votes | Total votes | 49,762 | 100.0 |

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

* Nick Stella

##### Eliminated in primary

* Connor Vlakancic

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Nick Stella | 23,992 | 79.3 |
| | Republican | Connor Vlakancic | 6,253 | 20.7 |
| Total votes | Total votes | Total votes | 30,245 | 100.0 |

### General election
#### Results

Illinois's 11th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Bill Foster (incumbent) | 145,407 | 63.8 |
| | Republican | Nick Stella | 82,358 | 36.2 |
| Total votes | Total votes | Total votes | 227,765 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 12

Incumbent Republican Mike Bost, who had represented the district since 2015, ran for re-election. He was re-elected with 54.3% of the vote in 2016. The district had a PVI of R+5.

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

* Mike Bost, incumbent U.S. Representative

##### Eliminated in primary

* Preston Nelson

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Bost (incumbent) | 31,658 | 83.5 |
| | Republican | Preston Nelson | 6,258 | 16.5 |
| Total votes | Total votes | Total votes | 37,916 | 100.0 |

### Democratic primary

On May 22, 2017, the Democratic Congressional Campaign Committee announced the 12th as a target on the list of expanded targets.

#### Candidates
##### Nominee

* Brendan Kelly, St. Clair County state attorney

##### Eliminated in primary

* David Bequette, businessman

##### Withdrawn

* Adam King, bartender and former archive technician at the National Archives and Records Administration
* Pat McMahan, Mascoutah city councilman
* Chris Miller, businessman
* Dean Pruitt, businessman, mathematician, and co-founder and former science director of the City Museum
* John Sholar, attorney

##### Declined

* Nathan Colombo, marketing executive

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Brendan Kelly | 40,555 | 81.0 |
| | Democratic | David Bequette | 9,526 | 19.0 |
| Total votes | Total votes | Total votes | 50,081 | 100 |

### Green primary
#### Candidates
##### Nominee

* Randall Auxier, professor of philosophy and communications studies at Southern Illinois University – Carbondale

#### Primary results

Green primary results :
| Party | Party | Candidate | Votes | % |
| | Green | Randall Auxier | 131 | 100.0 |
| Total votes | Total votes | Total votes | 131 | 100.0 |

### General election
#### Endorsements

U.S. Executive Branch officials
* Donald Trump, 45th President of the United States
U.S. Executive Branch officials
* Barack Obama, 44th President of the United States

#### Debates

2018 Illinois's 12th congressional district debate :
| No. | Date | Host | Moderator | Link | Republican | Democratic | Green |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | | | |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Mike Bost | Brendan Kelly | Randall Auxier |
| 1 | Oct. 23, 2018 | WSIU-TV | Jak Tichenor | | P | P | P |

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Mike Bost (R) | Brendan Kelly (D) | Randall Auxier (G) | Undecided |
| NYT Upshot/Siena College | October 18–22, 2018 | 502 | ± 4.7% | 48% | 39% | 2% | 11% |
| Global Strategy Group (D) | October 3–7, 2018 | 404 | ± 4.9% | 46% | 45% | – | 9% |
| DCCC Targeting & Analytics (D) | September 26–27, 2018 | 574 | ± 4.2% | 42% | 41% | 8% | 8% |
| NYT Upshot/Siena College | September 4–6, 2018 | 533 | ± 4.6% | 44% | 43% | – | 13% |
| Public Policy Polling (D) | April 16–17, 2018 | 622 | ± 3.9% | 44% | 39% | – | 15% |

#### Predictions

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

#### Results

Illinois's 12th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Mike Bost (incumbent) | 134,884 | 51.6 |
| | Democratic | Brendan Kelly | 118,724 | 45.4 |
| | Green | Randall Auxier | 7,935 | 3.0 |
| Majority | Majority | Majority | 16,160 | 6.2 |
| Total votes | Total votes | Total votes | 261,543 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 13

Incumbent Republican Rodney Davis, who had represented the district since 2013, ran for re-election. He was re-elected with 59.7% of the vote in 2016. The district had a PVI of R+3.

### Republican primary
#### Candidates
##### Declared

* Rodney Davis, incumbent U.S. Representative

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Rodney Davis (incumbent) | 44,512 | 100.0 |
| Total votes | Total votes | Total votes | 44,512 | 100.0 |

### Democratic primary

On January 30, 2017, the Democratic Congressional Campaign Committee announced the 13th as one of three Illinois targets.

#### Candidates
##### Nominee

* Betsy Dirksen Londrigan, nonprofit executive

##### Eliminated in primary

* Jon Ebel, director of graduate studies in religion at University of Illinois at Urbana–Champaign
* David Gill, physician and nominee for the 15th district in 2004, 2006, 2010 and for this seat in 2012
* Erik Jones, former Illinois Assistant Attorney General
* Angel Sides

##### Withdrawn

* Benjamin Webb, teacher

##### Declined

* Carol Ammons, state representative
* Dillon Clark, Montgomery County board-member

#### Endorsements

U.S. senators
* Dick Durbin
* Kirsten Gillibrand
Organizations
* EMILY's List
Organizations
* Justice Democrats

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Betsy Dirksen Londrigan | 24,515 | 45.7 |
| | Democratic | Erik Jones | 12,024 | 22.4 |
| | Democratic | David Gill | 7,757 | 14.4 |
| | Democratic | Jon Ebel | 7,167 | 13.3 |
| | Democratic | Angel Sides | 2,237 | 4.2 |
| Total votes | Total votes | Total votes | 53,700 | 100.0 |

### General election
#### Debate

2018 Illinois's 13th congressional district debate :
| No. | Date | Host | Moderator | Link | Republican | Democratic |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | | |
| Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Key: P Participant  A Absent  N Not invited  I Invited W Withdrawn | Rodney Davis | Betsey Londrigan |
| 1 | Oct. 18, 2018 | Illinois Public Media | Niala Boodhoo | | P | P |

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Rodney Davis (R) | Betsy Dirksen Londrigan (D) | Undecided |
| NYT Upshot/Siena College | October 21–25, 2018 | 501 | ± 4.6% | 46% | 41% | 13% |
| GBA Strategies (D) | October 1–4, 2018 | 500 | ± 4.4% | 49% | 48% | – |
| American Viewpoint (R) | September 29 – October 1, 2018 | 400 | ± 4.9% | 50% | 37% | 9% |
| Public Policy Polling (D) | April 16–17, 2018 | 726 | ± 3.6% | 45% | 42% | 13% |

#### Predictions

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

#### Results

Illinois's 13th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Rodney Davis (incumbent) | 136,516 | 50.4 |
| | Democratic | Betsy Dirksen Londrigan | 134,458 | 49.6 |
| | Independent | Thomas J. Kuna (write-in) | 7 | 0.0 |
| Majority | Majority | Majority | 2,058 | 0.8 |
| Total votes | Total votes | Total votes | 270,981 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 14

Incumbent Randy Hultgren, who had represented the district since 2011, ran for re-election. He was re-elected with 59.3% of the vote in 2016. The district had a PVI of R+5.

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

* Randy Hultgren, incumbent U.S. Representative

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Randy Hultgren (incumbent) | 51,672 | 100.0 |
| Total votes | Total votes | Total votes | 51,672 | 100.0 |

### Democratic primary

On January 30, 2017, the Democratic Congressional Campaign Committee announced the 14th as one of three Illinois targets.

#### Candidates
##### Nominee

* Lauren Underwood, nurse and former senior advisor at the U.S. Department of Health and Human Services

##### Eliminated in primary

* Matt Brolley, Montgomery village president
* Victor Swanson, high school teacher
* Jim Walz, nominee for this seat in 2016

#### Endorsements

U.S. representatives
* Bill Foster, U.S. Representative from Illinois's 11th congressional district (and former Representative from Illinois's 14th congressional district)
* Jan Schakowsky, U.S. Representative from Illinois's 9th congressional district
Labor unions
* AFL-CIO
* Illinois Federation of Teachers
Organizations
* Citizen Action Illinois
* Illinois Democratic County Chairs’ Association
* Sierra Club
Newspapers
* Chicago Sun-Times
Local officials
* Mark Pietrowski, DeKalb County Chair
* Tom Weisner, former Mayor of Aurora, Illinois

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Lauren Underwood | 29,391 | 57.3 |
| | Democratic | Matthew Brolley | 6,845 | 13.4 |
| | Democratic | Jim Walz | 5,100 | 10.0 |
| | Democratic | Victor Swanson | 3,597 | 7.0 |
| | Democratic | John Hosta | 2,578 | 5.0 |
| | Democratic | George Weber | 2,570 | 5.0 |
| | Democratic | Daniel Roldan-Johnson | 1,170 | 2.3 |
| Total votes | Total votes | Total votes | 51,251 | 100.0 |

### General election
#### Endorsements

U.S. Executive Branch officials
* Donald Trump, 45th President of the United States
U.S. Executive Branch officials
* Joe Biden, 47th Vice President of the United States
* Barack Obama, 44th President of the United States
Newspapers
* Chicago Sun-Times

#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Randy Hultgren (R) | Lauren Underwood (D) | Undecided |
| NYT Upshot/Siena College | October 31 – November 4, 2018 | 428 | ± 5.0% | 43% | 49% | 8% |
| NYT Upshot/Siena College | October 3–8, 2018 | 501 | ± 4.6% | 47% | 43% | 10% |
| Public Policy Polling (D) | April 16–17, 2018 | 682 | ± 3.8% | 45% | 41% | 14% |

#### Predictions

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

#### Results

Illinois's 14th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Lauren Underwood | 156,035 | 52.5 |
| | Republican | Randy Hultgren (incumbent) | 141,164 | 47.5 |
| Majority | Majority | Majority | 14,871 | 5.0 |
| Total votes | Total votes | Total votes | 297,199 | 100.0 |
| | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican | Democratic gain from Republican |

## District 15

Incumbent Republican John Shimkus, who had represented the district since 1997, ran for re-election. He was re-elected with 100.0% of the vote in 2016 The district had a PVI of R+21.

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

* John Shimkus, incumbent U.S. Representative

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | John Shimkus (incumbent) | 73,825 | 100.0 |
| Total votes | Total votes | Total votes | 73,825 | 100.0 |

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

* Kevin Gaither, teacher

##### Eliminated in primary

* Carl Spoerer

##### Withdrawn

* Anthony March

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Kevin Gaither | 17,300 | 62.1 |
| | Democratic | Carl Spoerer | 10,573 | 37.9 |
| Total votes | Total votes | Total votes | 27,873 | 100.0 |

### General election
#### Results

Illinois's 15th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | John Shimkus (incumbent) | 181,294 | 70.9 |
| | Democratic | Kevin Gaither | 74,309 | 29.1 |
| | Independent | Tim E. Buckner (write-in) | 5 | 0.0 |
| Total votes | Total votes | Total votes | 255,608 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 16

Incumbent Republican Adam Kinzinger, who had represented the district since 2011, ran for re-election. He was re-elected with 100.0% of the vote in 2016. The district had a PVI of R+8.

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

* Adam Kinzinger, incumbent U.S. Representative

##### Eliminated in primary

* James Marter, candidate for U.S. Senate in 2016

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Adam Kinzinger (incumbent) | 44,878 | 67.9 |
| | Republican | Jim Marter | 21,242 | 32.1 |
| Total votes | Total votes | Total votes | 66,120 | 100.0 |

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

* Sara Dady, lawyer

##### Eliminated in primary

* Neill Mohammad, healthcare management consultant
* Amy Murri Briel

##### Withdrew

* Chris Minelli, attorney

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Sara Dady | 17,713 | 40.3 |
| | Democratic | Neill Mohammad | 11,599 | 27.2 |
| | Democratic | Amy Briel | 8,291 | 19.5 |
| | Democratic | Beth Vercolio-Osmund | 5,526 | 13.0 |
| Total votes | Total votes | Total votes | 43,129 | 100.0 |

### General election
#### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Adam Kinzinger (R) | Sara Dady (D) | Undecided |
| Change Research (D) | October 27–29, 2018 | 554 | – | 55% | 41% | 4% |

#### Results

Illinois's 16th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Adam Kinzinger (incumbent) | 151,254 | 59.1 |
| | Democratic | Sara Dady | 104,569 | 40.9 |
| | Independent | John M. Stassi (write-in) | 2 | 0.0 |
| Majority | Majority | Majority | 46,685 | 18.2 |
| Total votes | Total votes | Total votes | 255,825 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |

## District 17

Incumbent Democrat Cheri Bustos, who had represented the district since 2013, ran for re-election, after exploring a run for Governor of Illinois. She was re-elected with 60.3% of the vote in 2016, while Republican Donald Trump defeated Democrat Hillary Clinton in the presidential election by less than a one-point margin in the district. The district had a PVI of D+3.

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

* Cheri Bustos, incumbent U.S. Representative

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Cheri Bustos (incumbent) | 42,964 | 100.0 |
| Total votes | Total votes | Total votes | 42,964 | 100.0 |

### Republican primary

On February 8, 2017, the National Republican Congressional Committee announced the 17th as one of its initial targets.

#### Candidates
##### Nominee

* Bill Fawell, real estate broker

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Bill Fawell | 38,411 | 100.0 |
| Total votes | Total votes | Total votes | 38,411 | 100.0 |

### General election
#### Results

Illinois's 17th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Democratic | Cheri Bustos (incumbent) | 142,659 | 62.1 |
| | Republican | Bill Fawell | 87,090 | 37.9 |
| Total votes | Total votes | Total votes | 229,749 | 100.0 |
| | Democratic hold | Democratic hold | Democratic hold | Democratic hold |

## District 18

Incumbent Republican Darin LaHood, who had represented the district since 2015, ran for re-election. He was re-elected with 72.1% of the vote in 2016. The district had a PVI of R+15.

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

* Darin LaHood, incumbent U.S. Representative

##### Eliminated in primary

* Donald Rients

#### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Darin LaHood (incumbent) | 61,722 | 78.9 |
| | Republican | Donald Rients | 16,535 | 21.1 |
| Total votes | Total votes | Total votes | 78,257 | 100.0 |

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

* Junius Rodriguez, history professor

##### Eliminated in primary

* Brian Deters
* Darrel Miller

#### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Junius Rodriguez | 14,990 | 41.7 |
| | Democratic | Brian Deters | 14,189 | 39.5 |
| | Democratic | Darrel Miller | 6,757 | 18.8 |
| Total votes | Total votes | Total votes | 35,936 | 100.0 |

### General election
#### Results

Illinois's 18th congressional district, 2018 :
| Party | Party | Candidate | Votes | % |
| | Republican | Darin LaHood (incumbent) | 195,927 | 67.2 |
| | Democratic | Junius Rodriguez | 95,486 | 32.8 |
| Total votes | Total votes | Total votes | 291,413 | 100.0 |
| | Republican hold | Republican hold | Republican hold | Republican hold |