Washington held special elections on November 7, 2017, deciding 11 legislative seats across 8 districts.
Legislature
- House (98 seats): 50 D, 48 R before the election, 50 D, 48 R after; control stayed with Democrats.
- Senate (49 seats): 25 D, 24 R before the election, 26 D, 23 R after; control moved from a bipartisan coalition to Democrats.
Legislative races
Ballot measures
| Measure | Description | Result |
|---|
| Advisory Vote 16 | Status of HB 1597, which increased commercial fishing fees | Failed (45.59% yes) |
| Advisory Vote 17 | Status of HB 2163, which made changes to sales and use tax and business and occupation tax | Failed (37.66% yes) |
| Advisory Vote 18 | Status of HB 2242, which increased the state property tax | Failed (40.95% yes) |