Illinois sent 15 Democrats and 7 Republicans to the US House in 1990.

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

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Illinois — 1990 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	+87.5%	Charles A Hayes	107,598
IL-02	D	+56.4%	Gus Savage	102,595
IL-03	D	+41.9%	Marty Russo	155,811
IL-04	D	+18.4%	George E Sangmeister	130,548
IL-05	D	+35.4%	William O Lipinski	111,246
IL-06	R	−33.4%	Henry J Hyde	144,565
IL-07	D	+59.9%	Cardiss Collins	100,120
IL-08	D	+79.1%	Dan Rostenkowski	88,680
IL-09	D	+42.4%	Sidney R Yates	135,588
IL-10	R	−37.0%	John Edward Porter	153,599
IL-11	D	+9.0%	Frank Annunzio	154,245
IL-12	R	−82.2%	Philip M Crane	137,531
IL-13	R	−31.6%	Harris W Fawell	176,353
IL-14	R	−33.8%	J Dennis Hastert	167,975
IL-15	R	−100.0%	Edward R Madigan	119,822
IL-16	D	+9.2%	John W Cox JR	152,166
IL-17	D	+33.0%	Lane Evans	153,442
IL-18	R	−98.4%	Robert H Michel	107,370
IL-19	D	+33.9%	Terry L Bruce	171,888
IL-20	D	+32.4%	Richard J Durbin	196,547
IL-21	D	+32.1%	Jerry F Costello	144,157
IL-22	D	+83.7%	Glenn Poshard	165,321