Oregon's 13th Senate district

District 13 of the Oregon State Senate comprises parts of Clackamas, Washington, and Yamhill counties centered around Sherwood, Tigard, and Wilsonville. It contains Oregon House districts 25 and 26. It is currently represented by Democrat Aaron Woods of Wilsonville.

Election results
District boundaries have changed over time. Therefore, senators before 2021 may not represent the same constituency as today. From 1993 until 2023, it covered various areas in the northern Willamette valley stretching from Hillsboro to Keizer.

The current district shrunk from its previous iterations due to population growth in Washington County, losing Keizer and all land in Marion County as well as all parts of Hillsboro.

The results are as follows: