Oregon's 12th Senate district
District 12 of the Oregon State Senate comprises parts of Washington, Yamhill, Polk, Marion, and Benton counties. It is currently represented by Republican Brian Boquist of McMinnville.Election results
District boundaries have changed over time, therefore, senators before 2013 may not represent the same constituency as today. From 1993 until 2003, the district covered parts Clackamas County, and from 2003 until 2013 it covered a slightly different area in the Willamette Valley.
| Year | Candidate | Party | Percent | Opponent | Party | Percent |
| 1982 | Walt Brown | Democratic | 63.1% | Larry Burright | Republican | 36.8% |
| 1986 | Bill Kennemer | Republican | 52.2% | Walt Brown | Democratic | 47.8% |
| 1990 | Bill Kennemer | Republican | 57.0% | Bob Johnson | Democratic | 43.0% |
| 1994 | Bill Kennemer | Republican | 54.3% | Dave McTeague | Democratic | 45.7% |
| 1998 | Verne Duncan | Republican | 57.9% | Monroe Mark Sweetland | Democratic | 42.1% |
| 2004 | Gary George | Republican | 58.7% | Hank Franzoni | Democratic | 41.3% |
| 2008 | Brian Boquist | Republican | 60.6% | Kevin C. Nortness | Democratic | 39.1% |
| 2012 | Brian Boquist | Republican | 60.0% | Annette Frank | Democratic | 39.8% |
| 2016 | Brian Boquist | Republican | 62.9% | Ross Swartzendruber | Democratic | 36.9% |
