The 2012 United States House of Representatives elections in Illinois were held on Tuesday, November 6, 2012, to elect the 18 U.S. representatives from the state, one from each of the state's 18 congressional districts, a loss of one seat following the 2010 United States census. The elections coincided with the elections of other federal and state offices, including a quadrennial presidential election. Primary elections were held on March 20, 2012.[1]
Republicans struggled after a strong showing in 2010, losing a total of five seats, one via redistricting, and four via loses by incumbents. Joe Walsh, Bob Dold, Judy Biggert, and Bobby Schilling were all defeated in their bids for re-election. Walsh, Dold, and Schilling had all been elected during the wave year of 2010.