2020Final results
2020 election for Illinois Representative District 104
Illinois House of Representatives · Illinois
Mike Marron (R) won with 58.8% of the vote, defeating Cynthia E. Cunningham (D) by 17.5 points.
Mike MarronRepublican · winner · incumbent
58.8%27,096
Cynthia E. CunninghamDemocrat
41.2%19,007
46,103 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET