 In 1961, the district was widened westward to the Des Plaines River and east into parts of Lincoln Square.The district covered the northwest side of Chicago until the early 1990s when it moved closer to its current area, encompassing most of LaSalle and Grundy Counties, the southern part of Will County, the northern part of Kankakee County and a small portion of southwestern Cook County.The Illinois Congressional Reapportionment Act of 2001 (10 ILCS 76) defined its boundaries following the U.S. Census 2000.