- Lead
- 38,374
- Total
- 94,004
- vs nation
- D+42.3
Washington 40th State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 36,716
- Total
- 97,146
- vs nation
- D+33.3
- Lead
- 24,311
- Total
- 78,047
- vs nation
- D+29.1
- Lead
- 23,059
- Total
- 72,813
- vs nation
- D+27.8
- Lead
- 25,438
- Total
- 72,753
- vs nation
- D+27.7
- Lead
- 16,735
- Total
- 65,603
- vs nation
- D+28.0
- Lead
- 9,516
- Total
- 54,372
- vs nation
- D+17.0
- Lead
- 10,184
- Total
- 48,843
- vs nation
- D+12.3
Key facts
- 2024 presidential margin
- D+40.8MIT Election Lab
- Population
- 156,6732024 5-year
- Population density
- 384 / sq mi2024 5-year · TIGER/Line
- Land area
- 408 sq miTIGER/Line
- Median household income
- $86,9902024 5-year
- White (non-Hispanic)
- 74.8%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 13.6%2024 5-year
- Peak Democratic margin
- D+42.6 in 1964MIT Election Lab
- Peak Republican margin
- R+38.6 in 1904MIT Election Lab
- Most similar
- Legislative (House) District 22, WA · twin score 95.5
presidential history
Party record book
Washington 40th State House 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
Lyndon B. Johnson1964
71.0%
17,234 votes · D+42.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 68.4%
Republican
Herbert Hoover1928
65.9%
7,709 votes · R+33.5 · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · 62.5%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
65,382votes
67.3% of the vote · D+37.8 · modeled estimate
Runner-up · Kamala Harris, 2024 · 64,316 votes
Republican
Donald Trump2020
28,666votes
29.5% of the vote · D+37.8 · modeled estimate
Runner-up · Donald Trump, 2024 · 25,942 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
+42.3pts D vs U.S.
Place D+40.8 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +33.3 pts
Republican
Theodore Roosevelt1904
+19.0pts R vs U.S.
Place R+38.6 · U.S. R+19.7 · modeled estimate
Runner-up · William H. Taft, 1912 · +16.1 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
With a 2024 presidential margin of D+40.9, this district ranks among the state's most lopsided, suggesting a dense urban or near-urban core where Democratic candidates face little competitive pressure in general elections.
Across the recorded series it reached a Democratic high of 42.6 points in 1964 and a Republican high of 38.6 points in 1904. Between 2020 and 2024 the district moved 3.0 points toward the Democratic candidate; the 2024 margin was 40.8 points.
A population of 156,673, a 75% non-Hispanic-white share, and a median household income of $86,990 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (House) District 22 and Legislative (House) District 23.
The state-house 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 40th State House District. Akashic. https://akashic.app/sld-lower/53040/. Accessed May 20, 2026. License: CC BY 4.0.