Illinois

Redistricting Algorithm

Current Congressional Districts

FairyMandered Districts

Demographic Distribution For Current Congressional Districts

FYI: % Based on Registered Voter

Demographic Distribution For FairyMandered Districts




FYI: % Based on Registered Voter

Fairness Metrics

Current Congressional Districts Scores

☞ Reock Score ⓘ Measurement of compactness for each district that ranges from 0 to 1

0.29

☞ Polsby Popper ⓘ Measurement of compactness between a district's area and the square of its perimeter

0.15

☞ Efficiency Gap ⓘ Measurement of competitiveness where wasted votes in an election quantify the degree of partisanship

-14.14

☞ Lopsided Margin ⓘ Measurement which calculates difference between the average percentages by which each part won in a district

-1.59

☞ Mean-Median ⓘ Difference between the median and mean vote-share across all districts for one party

2.40

☞ Dissimilarity Index ⓘ Measurement of minority representation within a district
  • Hispanic: 0.40
  • African American: 0.49
  • East & South Asian: 0.33
  • Native American: 0.21
  • Other: 0.21

FairyMandered Districts Scores

☞ Reock Score ⓘ Measurement of compactness for each district that ranges from 0 to 1

0.43

☞ Polsby Popper ⓘ Measurement of compactness between a district's area and the square of its perimeter

0.22

☞ Efficiency Gap ⓘ Measurement of competitiveness where wasted votes in an election quantify the degree of partisanship

1.23

☞ Lopsided Margin ⓘ Measurement which calculates difference between the average percentages by which each part won in a district

17.22

☞ Mean-Median ⓘ Difference between the median and mean vote-share across all districts for one party

4.69

☞ Dissimilarity Index ⓘ Measurement of minority representation within a district
  • Hispanic: 0.36
  • African American: 0.60
  • East & South Asian: 0.36
  • Native American: N/A
  • Other: 0.34

Illinois Redistricting Laws After 2020 Census

  • Illinois enacted a congressional map on November 24, 2021, following a signature by Gov. J.B. Pritzker.
  • Illinois State Legislature approved new state legislative maps on August 31st, 2021.
  • Illinois has 17 United States representatives and 177 state legislators.
click here to learn more about Illinois' redistricting laws

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