- Lead
- 131,094
- Total
- 320,258
- vs nation
- D+42.4
Washington 9th Congressional District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 160,097
- Total
- 358,053
- vs nation
- D+40.3
- Lead
- 123,762
- Total
- 291,153
- vs nation
- D+40.4
- Lead
- 90,723
- Total
- 278,379
- vs nation
- D+28.7
- Lead
- 90,646
- Total
- 265,123
- vs nation
- D+26.9
- Lead
- 58,828
- Total
- 258,542
- vs nation
- D+25.2
- Lead
- 40,023
- Total
- 230,595
- vs nation
- D+16.8
- Lead
- 36,974
- Total
- 213,918
- vs nation
- D+8.8
Key facts
- 2024 presidential margin
- D+40.9MIT Election Lab
- Population
- 768,3942024 5-year
- Population density
- 4,206 / sq mi2024 5-year · TIGER/Line
- Land area
- 183 sq miTIGER/Line
- Median household income
- $100,4202024 5-year
- White (non-Hispanic)
- 40.6%2024 5-year
- Black
- 12.0%2024 5-year
- Hispanic / Latino
- 14.3%2024 5-year
- Peak Democratic margin
- D+44.7 in 2020MIT Election Lab
- Peak Republican margin
- R+62.2 in 1904MIT Election Lab
- Most similar
- Congressional District 7, WA · twin score 90.6
presidential history
Party record book
Washington 9th Congressional District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Joe Biden2020
71.0%
254,223 votes · D+44.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 68.4%
Republican
Theodore Roosevelt1904
76.5%
6,769 votes · R+62.2 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 69.8%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
254,223votes
71.0% of the vote · D+44.7 · modeled estimate
Runner-up · Kamala Harris, 2024 · 219,152 votes
Republican
Ronald Reagan1984
108,312votes
56.7% of the vote · R+14.4 · modeled estimate
Runner-up · George W. Bush, 2004 · 98,194 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Kamala Harris2024
+42.4pts D vs U.S.
Place D+40.9 · U.S. R+1.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · +40.4 pts
Republican
Theodore Roosevelt1904
+42.5pts R vs U.S.
Place R+62.2 · U.S. R+19.7 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · +27.0 pts
Current officeholders
Federal officeholders only. State and local officeholders are planned for the next data pass.
U.S. House
Each result reflects the U.S. House district as it was drawn for that election; redistricting has redrawn these lines over time, so they can differ from the current 120th-Congress district shown on the map above.
Anchored in south Seattle and its inner suburbs, WA-09 regularly posts some of the widest presidential margins in the country, reflecting a dense, majority-minority electorate with strong labor-organizing roots.
Across the recorded series it reached a Democratic high of 44.7 points in 2020 and a Republican high of 62.2 points in 1904. Between 2020 and 2024 the district moved 3.8 points toward the Republican candidate; the 2024 margin was 40.9 points.
A population of 768,394, a 41% non-Hispanic-white share, and a median household income of $100,420 describe the district. The district's voting pattern over the last decade is most similar to that of Congressional District 7 and Congressional District 16.
The congressional districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
Washington 9th Congressional District. Akashic. https://akashic.app/cd/5309/. Accessed May 20, 2026. License: CC BY 4.0.