Redistricting passed by the Indiana General Assembly in 2011 shifted the district's boundaries, effective January 2013, to include all of Lake and Porter counties and the western and northwestern townships of La Porte County, while moving Benton, Jasper and Newton counties out of the district.

It includes almost all of the Indiana side of the Chicago metropolitan area.

LaPorte townships within the first district include Coolspring, Michigan, New Durham, Scipio, Springfield, and most of Center.

Michigan City and five townships (Clinton, Coolspring, Dewey, New Durham, and Springfield) exist entirely in the 1st district.

La Porte and eleven townships (Hanna, Hudson, Johnson, Lincoln, Noble, Pleasant, Prairie, Scipio, Union, Washington, and Wills) are split between the 1st and 2nd districts by Indiana West 500N and Indiana South/North 600W.