Illinois sent 13 Democrats and 5 Republicans to the US House in 2020.

18 districts. Each row shows the winning party, margin, and member elected. Vote counts are the certified district totals.

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Illinois — 2020 House districts

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

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District	Won	Margin	Member elected	Votes
IL-01	D	+47.6%	Bobby L Rush	325,123
IL-02	D	+57.6%	Robin L Kelly	298,038
IL-03	D	+12.8%	Marie Newman	306,848
IL-04	D	+68.1%	Jesus G \"Chuy\" Garcia	222,737
IL-05	D	+44.1%	Mike Quigley	361,271
IL-06	D	+7.4%	Sean Casten	404,747
IL-07	D	+67.1%	Danny K Davis	310,128
IL-08	D	+73.2%	Raja Krishnamoorthi	254,578
IL-09	D	+42.0%	Janice D Schakowsky	369,170
IL-10	D	+27.8%	Bradley Scott Schneider	316,874
IL-11	D	+26.6%	Bill Foster	307,377
IL-12	R	−20.9%	Mike Bost	322,416
IL-13	R	−8.9%	Rodney Davis	333,021
IL-14	D	+1.3%	Lauren Underwood	401,052
IL-15	R	−46.9%	Mary Miller	333,506
IL-16	R	−29.4%	Adam Kinzinger	338,159
IL-17	D	+4.1%	Cheri Bustos	299,895
IL-18	R	−40.8%	Darin Lahood	371,879