99chambers

Illinois State Senate seat · lines in effect since 2022

Illinois Legislative District 31

A district of about 201,000 people, 30% Hispanic, 38% of adults with a bachelor's degree. It votes D+19.6 relative to the nation for president.

Mary Edly-Allen (D) · since Nov 8, 2022Next election Nov 7, 2028

Where it sits among all 59 seats

Every Illinois State Senate 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+19.625th most
Democratic
Most DemocraticMost Republican30th 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.

201620182020
U.S. SenateD+7.8No raceD+15.7
GovernorNo raceD+8.4No race

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 59 seats. Small marks are other seats in Illinois. The black marker is District 31.

Adults with a bachelor's degree38% 55th pct · 27th of 59 in IL

Higher than 55% of seats.

White adults without a degree32% 47th pct · 32nd of 59 in IL

Lower than 53% of seats.

Hispanic residents30% 83rd pct · 11th of 59 in IL

Higher than 83% of seats.

Black residents8% 57th pct · 26th of 59 in IL

Higher than 57% of seats.

Asian residents6% 57th pct · 26th of 59 in IL

Higher than 57% of seats.

People per square mile1,371 45th pct · 33rd of 59 in IL

Less dense than 55% 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 25
41% Hispanic · 35% college gradsD+18.9Not up in 2026District 43
34% Hispanic · 26% college gradsD+14.5Not up in 2026District 10
26% Hispanic · 40% college gradsD+12.1Not up in 2026District 49
43% college gradsD+11.6Not up in 2026

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