2018Final results
2018 election for Illinois Representative District 90
Illinois House of Representatives · Illinois
Tom Demmer (R) won with 61.2% of the vote, defeating Amy Davis (D) by 22.4 points.
Tom DemmerRepublican · winner · incumbent
61.2%23,690
Amy DavisDemocrat
38.8%15,030
38,720 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET