IL-12 elected a Republican in 2016.

R+14.6 on 313,002 certified votes. Below: the 2016 result and this district's margin across every cycle on record.

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IL-12 — 2016 result

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

Democratic (D)

124,246

39.7%

Republican (R)

169,976

54.3%

All others

18,780

6.0%

Margin

R+14.6

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Margin history

IL-12 across every cycle on record. Each year links to its district page.

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Year	Won	Margin	Votes
2024	R	−48.4%	367,629
2022	R	−50.0%	291,171
2020	R	−20.9%	322,416
2018	R	−6.2%	261,543
2016	R	−14.6%	313,002
2014	R	−10.6%	209,738
2012	D	+8.9%	303,949
2010	D	+23.3%	202,705
2008	D	+46.5%	298,181
2006	D	+100.0%	157,291
2004	D	+40.6%	286,435
2002	D	+38.5%	190,020
2000	D	+100.0%	183,257
1998	D	+20.7%	165,014
1996	D	+45.0%	209,519
1994	D	+31.8%	153,810
1992	D	+42.5%	236,877
1990	R	−82.2%	137,531
1988	R	−50.4%	220,682
1986	R	−55.4%	114,580
1984	R	−55.6%	205,119
1982	R	−35.5%	130,701
1980	R	−48.2%	249,818
1978	R	−59.1%	138,935
1976	R	−45.7%	208,553