U.S. House seat for Washington's 9th congressional district. Representatives serve two-year terms.

8 candidates filed, 2 active for the 2026 House election in Washington District 9. General election on Nov 3, 2026.
| Year | Winner | Result | Runner-Up | Total Votes |
|---|---|---|---|---|
| 2024 | Adam Smith D | 66.9% | 273,381 | |
| 2022 | Adam Smith D | 71.7% | 239,377 | |
| 2020 | Adam Smith D | 74.3% | 348,468 | |
| 2018 | Adam Smith D | 100.0% | 163,345 | |
| 2016 | Adam Smith D | 72.9% | 281,482 | |
| 2014 | Adam Smith D | 70.8% | 166,794 | |
| 2012 | Adam Smith D | 71.6% | 268,139 | |
| 2010 | Adam Smith D | 54.9% | 225,594 | |
| 2008 | Adam Smith D | 65.4% | 269,375 | |
| 2006 | Adam Smith D | 65.7% | 181,120 | |
| 2004 | Adam Smith D | 63.3% | 256,671 | |
| 2002 | Adam Smith D | 58.5% | 163,710 | |
| 2000 | Adam Smith D | 61.7% | 219,623 | |
| 1998 | Adam Smith D | 64.7% | 173,056 | |
| 1996 | Adam Smith D | 50.1% | 209,867 |