Following the Congressional Apportionment Act of 1947, the district covered a portion of Cook County and the far northwest side of Chicago roughly centered on Norwood Park.

The congressional district covers parts of Cook, Du Page, Kane, Kendall and Will counties, as of the 2011 redistricting which followed the 2010 census.

All or parts of Aurora, Bolingbrook, Darien, Joliet, Montgomery, Naperville, Lisle, Downers Grove, New Lenox, Shorewood and Woodridge are included.

The 11th district takes in the communities of Garden Prairie; half of the municipality of Belvidere; and part of Poplar Grove.

They are partitioned by Myelle Rd, Bass Line Rd, Illinois Highway 23, Whipple Rd, Plank Rd, Swanson Rd, and Darnell Rd.

The 11th district takes in the municipalities of North Aurora, Batavia, Kaneville, Elburn, Virgil, Lily Lake, Campton Hills, and Burlington; most of Hampshire; most of Geneva west of the Fox River; southern Pingree Grove; half of St. Charles, Aurora, and Huntley (shared with McHenry County); and part of Sugar Grove, Maple Park, and Elgin.

They are partitioned by Modaff Rd, Knoch Knolls Park, S Knight Rd, Kings Rd, Remington Blvd, The Links at Carillon, N Weber Rd, W Normantown Rd, Romeoville Prairie Nature Preserve, and the Chicago Sanitary and Ship Canal.

The 11th district takes in most of the village of Bolingbrook and half of Lemont (shared with Cook and DuPage counties) and Romeoville.