99chambers

Illinois House of Representatives seat · lines in effect since 2022

Illinois Representative District 31

A district of about 94,000 people, 49% Black, 22% of adults with a bachelor's degree. It votes D+45.9 relative to the nation for president.

Mike Crawford (D) · since Nov 5, 2024Next election Nov 7, 2028The 2026 race →

Where it sits among all 118 seats

Every Illinois House of Representatives seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.

D+45.924th most
Democratic
Most DemocraticMost Republican60th seat · the majority lineDistrict 31

Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Every race on these lines

Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.

20222024
Illinois House of RepresentativesD+54.9D+46.5

Outlined: the race for this seat itselfBlank: no race that year

Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 7, 2026, 3:01 PM ET

Who lives here, compared

Grey bars show the spread of all 118 seats. Small marks are other seats in Illinois. The black marker is District 31.

Adults with a bachelor's degree22% 15th pct · 101st of 118 in IL

Lower than 85% of seats.

White adults without a degree27% 38th pct · 73rd of 118 in IL

Lower than 62% of seats.

Hispanic residents14% 49th pct · 61st of 118 in IL

Lower than 51% of seats.

Black residents49% 93rd pct · 9th of 118 in IL

Higher than 93% of seats.

Asian residents2% 27th pct · 86th of 118 in IL

Lower than 73% of seats.

People per square mile5,872 76th pct · 29th of 118 in IL

Denser than 76% of seats.

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET

Seats most like this one

Nearest seats on demographics, density and lean.

District 28
42% Black · 26% college gradsD+40.2Held DDistrict 27
49% Black · 34% college gradsD+41.7Held DDistrict 30
26% Hispanic · 41% BlackD+57.8Held DDistrict 8
52% Black · 31% college gradsD+57.5Held D

Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET

Who has held it

These lines took effect in 2022.

  1. Michael Crawford (D)
    2025– · Won 2024 by 46.5, 2026 unopposed
  2. Mary E. Flowers (D)
    2023–2025 · Won 2022 by 54.9

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)