IL-18 elected a Republican in 2020.

R+40.8 on 371,879 certified votes. Below: the 2020 result and this district's margin across every cycle on record.

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IL-18 — 2020 result

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

Democratic (D)

110,039

29.6%

Republican (R)

261,840

70.4%

All others

0

0.0%

Margin

R+40.8

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Margin history

IL-18 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2020	R	−40.8%	371,879
2018	R	−34.5%	291,413
2016	R	−44.3%	347,283
2014	R	−49.4%	246,740
2012	R	−48.3%	329,631
2010	R	−43.3%	221,170
2008	R	−20.9%	310,088
2006	R	−34.6%	223,246
2004	R	−40.5%	307,595
2002	R	−100.0%	192,567
2000	R	−34.1%	259,023
1998	R	−100.0%	158,177
1996	R	−18.5%	241,523
1994	R	−20.8%	199,125
1992	R	−15.5%	270,976
1990	R	−98.4%	107,370
1988	R	−9.4%	209,221
1986	R	−25.2%	150,639
1984	R	−22.1%	223,106
1982	R	−3.2%	188,694
1980	R	−24.3%	202,043
1978	R	−31.8%	130,514
1976	R	−15.5%	187,130