[11] Joe Walsh, Adam Kinzinger, Randy Hultgren, and Bobby Schilling were all elected to fill those Democratic-held seats.

Results of the 2010 United States House of Representatives elections in Illinois by district:[13] Bobby Rush Democratic Bobby Rush Democratic In 2010 the 1st district included parts of Blue Island, Chicago, Oak Forest, Orland Park and Tinley Park.

[16] Harold Bailey, a manager for the Chicago Park District; Joanne Guillemette, an attorney; and Fred Smith, a program director at Maryville Academy, also sought the Democratic nomination.

[25] In 2010 Jackson's opponent in the general election was Republican nominee Isaac Hayes, an associate minister at the Apostolic Church of God.

[34] In 2010 Lipinski's opponent in the general election was Republican nominee Michael A. Bendas, a retired Colonel in the U.S. Army Reserve.

[46] In 2010 Gutiérrez's opponent in the general election was Republican nominee Israel Vasquez, the chief executive officer of Woodman Holdings Asset Management (WHAM).

Terrence Gilhooly[57] and Andrew Williams, who ran with the intention of highlighting the issue of campaign finance,[62] also sought the Green nomination.

[69] In 2010 Roskam's opponent in the general election was Democratic nominee Ben Lowe, a local organizer and environmentalist.

[83] Clarence Clemons, who has worked with Mayor of Chicago Eugene Sawyer and state representative Shirley Jones, ran as an independent candidate.

[84] James Ascot, a businessman and real estate agent; Sharon Denise Dixon, a member of the Chicago City Council; and Darlena Williams-Burnett, the chief deputy for the Cook County Recorder of Deeds, also sought the Democratic nomination.

[85] State representative Annazette Collins; Chicago City Council member Robert Fioretti; pastor Marshall Hatch; and Rickey Hendon, a member of the Illinois Senate, filed to run in the Democratic primary,[86] but abandoned their campaigns following Davis's announcement that he would seek re-election.

[97] Melissa Bean Democratic Joe Walsh Republican The 8th district included parts of Hoffman Estates, Palatine and Schaumburg.

[102] Dirk Beveridge, a business owner; John Dawson, a former member of the Crystal Lake High School District 155 school board; Chris Geissler, a manager with a consulting firm; Greg Jacobs, a retired deputy in the Cook County Sheriff's Office; and Maria Rodriguez, the mayor of Long Grove, also sought the Republican nomination.

"[105] Walsh was also sued by his former campaign manager for allegedly unpaid compensation, and was penalized by the U.S. House for failing to file disclosure reports.

[111] A poll of 1,381 registered voters, conducted by WAA on September 28, 2010, found Bean and Walsh tied again, with the support of 41 percent of respondents each.

[113] Sabato's Crystal Ball rated the race as "Likely Democratic", citing Bean's fundraising advantage and the district's 2008 presidential vote.

[133] Elizabeth Coulson, a member of the Illinois House of Representatives; Arie Friedman, a pediatrician; Dick Green, a businessman; and Paul Hamann, an options trader, also sought the Republican nomination.

[135] Julie Hamos, a member of the state House of Representatives; and Elliot Richardson, an attorney, also sought the Democratic nomination.

[137] Michael Bond, a member of the Illinois Senate;[138] and Milton Sumption, a businessman[139] ended their respective campaigns for the Democratic nomination in December 2009.

[140] Richard B. Mayers, an unemployed admitted anti-Semite, sought the Green Party nomination[141] but was removed from the ballot in November 2009 after failing to submit enough valid signatures.

[162] Debbie Halvorson Democratic Adam Kinzinger Republican The 11th district included Kankakee and parts of Bloomington, Joliet and Normal.

[163] In 2010 Halvorson's opponent in the general election was Republican nominee Adam Kinzinger, a pilot with the Air National Guard.

[164] David McAloon, the television and media producer for Family Harvest Church; Henry Meers Jr., a real estate investor; and Darrel Miller, a self-employed farmer, also sought the Republican nomination.

[189] In 2010 Biggert's opponent in the general election was Democratic nominee Scott Harper, an adjunct professor at North Central College and former business owner.

[196] Bill Foster Democratic Randy Hultgren Republican The 14th district included Carpentersville, DeKalb and parts of Aurora and Elgin.

[197] In 2010 Foster's opponent in the general election was Republican nominee Randy Hultgren, a member of the Illinois Senate.

[204] Jeff Danklefsen, who identified himself as "just a regular guy";[205] and Mark Vargas, who worked for the United States Department of Defense,[206] both ended their campaigns for the Republican nomination the same month.

[238] Phil Hare Democratic Bobby Schilling Republican The 17th district included Moline, Quincy, Rock Island and part of Decatur.

[253] In 2010 Schock's opponent in the general election was Deirdre "DK" Hirner, the former director of the Illinois Environmental Regulatory Group.

[263] In 2010 Shimkus's opponent in the general election was Democratic nominee Tim Bagwell, an information technology specialist who also ran in 2004.