Illinois sent 13 Democrats and 9 Republicans to the US House in 1986.

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

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Illinois — 1986 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	+92.8%	Charles A Hayes	126,948
IL-02	D	+67.7%	Gus Savage	118,417
IL-03	D	+32.4%	Martin A Russo	155,567
IL-04	R	−3.2%	Jack Davis	119,356
IL-05	D	+40.7%	William O Lipinski	117,204
IL-06	R	−50.8%	Henry J Hyde	130,260
IL-07	D	+61.6%	Cardiss Collins	113,164
IL-08	D	+57.5%	Dan Rostenkowski	105,256
IL-09	D	+43.3%	Sidney R Yates	129,453
IL-10	R	−50.2%	John E Porter	116,520
IL-11	D	+41.4%	Frank Annunzio	151,311
IL-12	R	−55.4%	Philip M Crane	114,580
IL-13	R	−46.8%	Harris W Farewell	146,101
IL-14	R	−4.7%	J Dennis Hastert	147,581
IL-15	R	−100.0%	Edward Madigan	115,284
IL-16	R	−33.7%	Lynn Morley Martin	139,069
IL-17	D	+11.3%	Lane Evans	153,543
IL-18	R	−25.2%	Robert H Michel	150,639
IL-19	D	+32.8%	Terry L Bruce	167,291
IL-20	D	+36.2%	Richard J Durbin	185,847
IL-21	D	+0.7%	Melvin Price	130,501
IL-22	D	+6.5%	Kenneth J Gray	183,318