Illinois sent 12 Democrats and 7 Republicans to the US House in 2008.

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

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Illinois — 2008 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	+71.7%	Bobby L Rush	271,397
IL-02	D	+78.8%	Jesse L Jackson JR	280,776
IL-03	D	+51.9%	Daniel Lipinski	235,524
IL-04	D	+69.1%	Luis V Gutierrez	139,606
IL-05	D	+51.9%	Rahm Emanuel	230,892
IL-06	R	−15.1%	Peter J Roskam	256,913
IL-07	D	+70.0%	Danny K Davis	276,817
IL-08	D	+21.4%	Melissa L Bean	295,525
IL-09	D	+52.7%	Janice D Schakowsky	243,694
IL-10	R	−5.1%	Mark Steven Kirk	291,258
IL-11	D	+23.9%	Deborah \"Debbie\" Halvorson	317,895
IL-12	D	+46.5%	Jerry F Costello	298,181
IL-13	R	−9.9%	Judy Biggert	337,771
IL-14	D	+15.5%	Bill Foster	321,057
IL-15	R	−28.4%	Timothy V Johnson	291,514
IL-16	R	−24.8%	Donald A Manzullo	312,220
IL-17	D	+99.8%	Phil Hare	221,478
IL-18	R	−20.9%	Aaron Schock	310,088
IL-19	R	−31.1%	John Shimkus	315,589