2018Final results
2018 election for Illinois Representative District 104
Illinois House of Representatives · Illinois
Mike Marron (R) won with 55.9% of the vote, defeating Cynthia E. Cunningham (D) by 11.8 points.
Mike MarronRepublican · winner
55.9%20,348
Cynthia E. CunninghamDemocrat
44.1%16,041
36,389 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