Oregon's 19th Senate district

District 19 of the Oregon State Senate comprises northwestern Clackamas, southwestern Multnomah, and southeastern Washington counties and includes Lake Oswego, Tualatin, and West Linn as well as Portland's South Waterfront. It is composed of Oregon House districts 37 and 38. It is currently represented by Democrat Rob Wagner of Lake Oswego.

Election results
District boundaries have changed over time. Therefore, senators before 2021 may not represent the same constituency as today. From 1993 until 2003, the district covered parts of the central Willamette Valley; from 2003 until 2013, it was similar to the current district with less of South Portland, Portland, Oregon; and from 2013 until 2023, it covered a similar area with the exception of Portland's South Waterfront and Far Southwest neighborhoods. The results are as follows