- Lead
- 6,122
- Total
- 86,015
- vs nation
- R+5.6
Washington 31st State House District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 6,194
- Total
- 86,411
- vs nation
- R+11.6
- Lead
- 6,618
- Total
- 67,168
- vs nation
- R+11.9
- Lead
- 6,414
- Total
- 65,246
- vs nation
- R+13.7
- Lead
- 5,482
- Total
- 62,517
- vs nation
- R+16.0
- Lead
- 11,508
- Total
- 60,810
- vs nation
- R+16.5
- Lead
- 7,702
- Total
- 51,986
- vs nation
- R+15.3
- Lead
- 3,726
- Total
- 45,705
- vs nation
- R+16.7
Key facts
- 2024 presidential margin
- R+7.1MIT Election Lab
- Population
- 157,0542024 5-year
- Population density
- 281 / sq mi2024 5-year · TIGER/Line
- Land area
- 560 sq miTIGER/Line
- Median household income
- $122,4562024 5-year
- White (non-Hispanic)
- 72.3%2024 5-year
- Black
- 2.4%2024 5-year
- Hispanic / Latino
- 9.4%2024 5-year
- Peak Democratic margin
- D+19.0 in 1936MIT Election Lab
- Peak Republican margin
- R+66.9 in 1904MIT Election Lab
- Most similar
- Legislative (House) District 25, WA · twin score 90.8
presidential history
Party record book
Washington 31st 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
Franklin D. Roosevelt1936
57.4%
7,272 votes · D+19.0 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 52.5%
Republican
Theodore Roosevelt1904
78.4%
2,421 votes · R+66.9 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 76.5%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
38,702votes
44.8% of the vote · R+7.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 38,399 votes
Republican
Donald Trump2020
44,896votes
52.0% of the vote · R+7.2 · modeled estimate
Runner-up · Donald Trump, 2024 · 44,521 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
Franklin D. Roosevelt1936
−5.2pts D vs U.S.
Place D+19.0 · U.S. D+24.3 · modeled estimate
Runner-up · Kamala Harris, 2024 · −5.6 pts
Republican
Theodore Roosevelt1904
+47.3pts R vs U.S.
Place R+66.9 · U.S. R+19.7 · modeled estimate
Runner-up · William H. Taft, 1908 · +44.0 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.
Washington 31st State House District sits in the Pacific Northwest. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 19.0 points in 1936 and a Republican high of 66.9 points in 1904. The 2024 margin was 7.1 points.
A population of 157,054, a 72% non-Hispanic-white share, and a median household income of $122,456 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (House) District 25 and Legislative (House) District 39.
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 31st State House District. Akashic. https://akashic.app/sld-lower/53031/. Accessed May 20, 2026. License: CC BY 4.0.