Illinois sent 11 Democrats and 13 Republicans to the US House in 1978.

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

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Illinois — 1978 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	+17.3%	Bennett M Stewart	81,279
IL-02	D	+74.2%	Morgan F Murphy	94,077
IL-03	D	+30.4%	Martin A Russo	146,800
IL-04	R	−33.7%	Edward J Derwinski	141,229
IL-05	D	+68.0%	John G Fary	117,506
IL-06	R	−32.4%	Henry J Hyde	131,737
IL-07	D	+72.6%	Cardiss Collins	74,989
IL-08	D	+71.9%	Dan Rostenkowski	94,762
IL-09	D	+50.7%	Sidney R Yates	116,217
IL-10	D	+0.4%	Abner J Mikva	178,309
IL-11	D	+47.5%	Frank Annunzio	152,412
IL-12	R	−59.1%	Philip M Crane	138,935
IL-13	R	−22.3%	Robert M McClory	104,738
IL-14	R	−50.1%	John N Erlenborn	158,179
IL-15	R	−24.8%	Tom Corcoran	129,612
IL-16	R	−30.9%	John B Anderson	117,309
IL-17	R	−41.2%	George M O'Brien	133,635
IL-18	R	−31.8%	Robert H Michel	130,514
IL-19	R	−100.0%	Tom Railsback	89,790
IL-20	R	−39.3%	Paul Findley	159,480
IL-21	R	−56.5%	Edward R Madigan	124,527
IL-22	R	−8.0%	Daniel B Crane	159,383
IL-23	D	+48.3%	Melvin Price	100,105
IL-24	D	+31.3%	Paul Simon	168,061