All 18 of Illinois' congressional districts are up for election in 2018.
Among the races expected to be most hotly contested are the 6th District race in the West suburbs where Democrat Sean Casten is seeking to unseat Republican Peter Roskam, who has been in Congress since 2007.
Another potentially tight Congressional race could take place in the west suburban 14th District where incumbent Republican Randy Hultgren, who has been in Congress since 2011, is seeking to fend off Democrat Lauren Underwood.
This page will be updated with live results from the Associated Press. A check mark next to a candidate's name means that AP has projected that candidate as the winner in the race.
Democrat-held seat | Chicago's South Side, southern Cook County and southwest to JolietSee map
Democrat-held seat | Chicago's South Side, southern Cook County, Will County and Kankakee CountySee map
Democrat-held seat | Cook County including southwest suburbs and BridgeportSee map
Democrat-held seat | Cook County, including Chicago with high Hispanic populations including Humboldt Park, Pilsen and Little VillageSee map
Democrat-held seat | Cook and DuPage counties including Chicago's North and Northwest sides, O'Hare Airport and Oak BrookSee map
Republican-held seat | Cook, DuPage, Lake, Kane and McHenry countiesSee map
Democrat-held seat | Cook County, including Chicago's Loop, South Side and West Side as well as western suburbsSee map
Democrat-held seat | Cook, Dupage and Kane counties including Carol Stream, Schaumburg, Elgin and Elk Grove VillageSee map
Democrat-held seat | North suburban Cook County and Rogers Park in ChicagoSee map
Democrat-held seat | Lake County and northern Cook CountySee map
Democrat-held seat | Cook, DuPage, Kane, Kendall and Will countiesSee map
Republican-held seat | DeKalb, DuPage, Kane, Kendall, Lake, McHenry and Will countiesSee map
Republican-held seat | Southeast Illinois, including suburban St. Louis, Carbondale and CairoSee map
Republican-held seat | Central Illinois including Springfield, Decatur, Champaign and UrbanaSee map
Republican-held seat | Southeast Illinois including Effingham, Mattoon and CharlestonSee map
Republican-held seat | Northern Illinois including DeKalb, Streator and OttawaSee map
Democrat-held seat | Northwestern Illinois including Quad Cities, Peoria and RockfordSee map
Republican-held seat | Central and western Illinois including Quincy, Bloomington, Peoria, and SpringfieldSee map