Illinois's 6th congressional district covers parts of Cook and DuPage counties.

The 6th district takes in the Chicago neighborhoods of Beverly; most of Mount Greenwood; and western Garfield Ridge and Clearing.

The 6th district takes in the communities of Downers Grove, Villa Park, Westmont, Willowbrook, and Oakbrook Terrace; most of Elmhurst, Lisle, Darien, Burr Ridge (shared with Cook County), Clarendon Hills, and Lombard; part of Addison; western Oak Brook; half of Wheaton east of Illinois Highway 23 and south of the Union Pacific Railroad; the portion of Glen Ellyn south of the Union Pacific Railroad.

After the 2011 redistricting which followed the 2010 census, the district included portions of Cook, DuPage, Kane, Lake and McHenry counties.

All or parts of Algonquin, Barrington, Barrington Hills, Bartlett, Burr Ridge, Carol Stream, Carpentersville, Cary, Clarendon Hills, Crystal Lake, Darien, Deer Park, Downers Grove, Elgin, East Dundee, Forest Lake, Fox River Grove, Gilberts, Illinois, Glen Ellyn, Hawthorn Woods, Hinsdale, Hoffman Estates, Inverness, Kildeer, Lake Barrington, Lake in the Hills, Lake Zurich, Lakewood, Lisle, Lombard, Long Grove, Naperville, North Barrington, Oak Brook, Oakbrook Terrace, Oakwood Hills, Palatine, Port Barrington, Rolling Meadows, Sleepy Hollow, South Barrington, South Elgin, St. Charles, Tower Lakes, Trout Valley, Warrenville, Wayne, West Chicago, West Dundee, Westmont, Wheaton, Willowbrook and Winfield are included.