2016Final results
2016 election for Illinois Legislative District 25
Illinois State Senate · Illinois
Jim Oberweis (R) won with 54.7% of the vote, defeating Corinne M. Pierog (D) by 9.3 points.
Jim OberweisRepublican · winner · incumbent
54.7%54,636
Corinne M. PierogDemocrat
45.3%45,317
The same year, the district voted D+13.5 for president; this race was R+9.3, a split ticket.99,953 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET
The seat over time
D − R margin in this seat's races around 2016
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 4:52 AM ET