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Prof. Justin Levitt's Doug Spencer's Guide to Drawing the Electoral Lines
Illinois | Process

2020 Illinois Maps

Last Updated Oct 22, 2021
Cycle 2020

Overview

Illinois’ congressional lines are drawn by the state legislature, as a regular statute, subject to gubernatorial veto. The legislature is also primarily responsible for drawing state legislative lines — but if it fails to pass a plan, authority falls to an eight-member backup commission.

The legislature adopted House and Senate maps on June 4, 2021 (ahead of its June 30 deadline). Because the decennial census data had not yet been published, the legislature relied on ACS estimates. The legislature adjusted these maps on Aug. 31, 2021 to ensure equipopulous districts. Gov. Pritzker signed the new maps into law on Sept. 24.

Two lawsuits were filed arguing that (1) the June maps were unconstitutional because they were not based on decennial census data, and (2) because the Sept. maps were drawn after the June 30 deadline, they are invalid and a backup commission should be convened.

On Oct. 19, 2021 a federal court ruled that (1) the June maps were unconstitutional, (2) the Sept. maps were invalid, but (3) that the court would draw the final maps (with input from the parties) and not a backup commission.

Maps

Download proposed and enacted maps, starting with the most recent.

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Final map (based on Census data)

Proposed Date Sep 24, 2021

Level State Upper

Preview Map Shapefile GeoJSON PDF

Preliminary maps (based on ACS data)

Proposed Date Jun 4, 2021

Level State Upper

Preview Map Shapefile GeoJSON PDF

Final map (based on Census data)

Proposed Date Sep 24, 2021

Level State Lower

Preview Map Shapefile GeoJSON PDF

Preliminary maps (based on ACS data)

Proposed Date Jun 4, 2021

Level State Lower

Preview Map Shapefile GeoJSON PDF

Preview: Map Name