2018Final results
2018 election for Oregon Senate District 20
Oregon State Senate · Oregon
Alan R. Olsen (R) won with 51.8% of the vote, defeating Charles Gallia (D) by 5.8 points.
Alan R. OlsenRepublican · winner · incumbent
51.8%33,685
Charles GalliaDemocrat
46.1%29,927
Kenny SernachIndependent
1.9%1,245
64,968 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