Illinois sent 13 Democrats and 9 Republicans to the US House in 1984.

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

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Illinois — 1984 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	+95.6%	Charles A Hayes	185,534
IL-02	D	+66.0%	Gus Savage	187,215
IL-03	D	+28.8%	Martin A Russo	222,582
IL-04	R	−28.0%	George M O'Brien	190,291
IL-05	D	+27.1%	William O Lipinski	167,708
IL-06	R	−50.2%	Henry J Hyde	209,562
IL-07	D	+56.7%	Cardiss Collins	172,908
IL-08	D	+42.6%	Dan Rostenkowski	160,417
IL-09	D	+35.1%	Sidney R Yates	214,495
IL-10	R	−45.2%	John E Porter	211,140
IL-11	D	+25.2%	Frank Annunzio	220,690
IL-12	R	−55.6%	Philip M Crane	205,119
IL-13	R	−34.0%	Harris W Fawell	235,234
IL-14	R	−24.3%	John E Grotberg	218,738
IL-15	R	−46.5%	Edward R Madigan	203,613
IL-16	R	−16.9%	Lynn Martin	218,538
IL-17	D	+13.3%	Lane Evans	226,345
IL-18	R	−22.1%	Robert H Michel	223,106
IL-19	D	+4.5%	Terry L Bruce	225,103
IL-20	D	+22.5%	Richard J Durbin	236,821
IL-21	D	+20.3%	Melvin Price	211,194
IL-22	D	+0.5%	Kenneth J Gray	232,728