Montana

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

0.46

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

0.35

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

37.02

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

cannot calculate - Rep. won every district

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

0.08

☞ Dissimilarity Index ⓘ Measurement of minority representation within a district
  • Hispanic: 0.00
  • African American: 0.10
  • East & South Asian: 0.03
  • Native American: 0.09
  • Other: 0.09

FairyMandered Districts Scores

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

0.55

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

0.44

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

31.78

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

cannot calculate - Rep. won every district

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

0.25

☞ Dissimilarity Index ⓘ Measurement of minority representation within a district
  • Hispanic: 0.05
  • African American: 0.08
  • East & South Asian: 0.03
  • Native American: 0.12
  • Other: 0.04

Montana Redistricting Laws After 2020 Census

  • Montana Districting and Apportionment Commission (MDAC) enacted a new congressional map on November 12th, 2021.
  • Montana enacted new legislative district boundaries on February 22nd, 2023.
  • Montana has 2 United States representatives and 150 state legislators.
click here to learn more about Montana's redistricting laws

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