2011 Redistricting
The district covers parts of McLean, Peoria, Sangamon, Stark and Tazewell counties, and all of Adams, Brown, Cass, Hancock, Logan, Marshall, Mason, McDonough, Menard, Morgan, Pike, Schuyler, Scott and Woodford counties, as of the 2011 redistricting which followed the 2010 census. All or parts of Bloomington, Chatham, Jacksonville, Lincoln, Macomb, Morton, Normal, Peoria, Quincy and Springfield are included. The representatives for these districts will be elected in the 2012 primary and general elections, and the boundaries will become effective on January 5, 2013.
Read more about this topic: Illinois's 18th Congressional District