Illinois sent 10 Democrats and 9 Republicans to the US House in 2004.

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

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Illinois — 2004 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	+69.7%	Bobby L Rush	249,949
IL-02	D	+88.5%	Jesse L Jackson JR	234,525
IL-03	D	+47.5%	Daniel William Lipinski	229,956
IL-04	D	+71.3%	Luis V Gutierrez	125,142
IL-05	D	+52.4%	Rahm Emanuel	207,930
IL-06	R	−11.7%	Henry J Hyde	250,097
IL-07	D	+72.3%	Danny K Davis	256,736
IL-08	D	+3.4%	Melissa Bean	270,393
IL-09	D	+51.5%	Janice D Schakowsky	231,417
IL-10	R	−28.3%	Mark Steven Kirk	276,711
IL-11	R	−17.3%	Jerry Weller	294,960
IL-12	D	+40.6%	Jerry F Costello	286,435
IL-13	R	−30.0%	Judy Biggert	308,312
IL-14	R	−37.3%	J Dennis Hastert	279,208
IL-15	R	−22.1%	Timothy V Johnson	291,739
IL-16	R	−38.2%	Donald A Manzullo	295,806
IL-17	D	+21.4%	Lane Evans	284,000
IL-18	R	−40.5%	Ray Lahood	307,595
IL-19	R	−38.7%	John Shimkus	307,754