- Lead
- 27,284
- Total
- 74,812
- vs nation
- D+37.9
Washington 21st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 30,720
- Total
- 81,071
- vs nation
- D+33.4
- Lead
- 20,978
- Total
- 64,526
- vs nation
- D+30.4
- Lead
- 21,017
- Total
- 60,979
- vs nation
- D+30.6
- Lead
- 21,640
- Total
- 59,580
- vs nation
- D+29.0
- Lead
- 13,958
- Total
- 53,358
- vs nation
- D+28.6
- Lead
- 11,880
- Total
- 45,293
- vs nation
- D+25.7
- Lead
- 11,562
- Total
- 39,948
- vs nation
- D+20.4
Key facts
- 2024 presidential margin
- D+36.5MIT Election Lab
- Population
- 156,9742024 5-year
- Population density
- 4,447 / sq mi2024 5-year · TIGER/Line
- Land area
- 35.3 sq miTIGER/Line
- Median household income
- $106,0282024 5-year
- White (non-Hispanic)
- 55.8%2024 5-year
- Black
- 5.7%2024 5-year
- Hispanic / Latino
- 12.7%2024 5-year
- Peak Democratic margin
- D+57.8 in 1936MIT Election Lab
- Peak Republican margin
- R+37.2 in 1904MIT Election Lab
- Most similar
- Legislative (Senate) District 32, WA · twin score 94.1
presidential history
Party record book
Washington 21st State Senate 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
76.5%
5,350 votes · D+57.8 · modeled estimate
Runner-up · Lyndon B. Johnson, 1964 · 75.3%
Republican
Theodore Roosevelt1904
61.6%
882 votes · R+37.2 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 57.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
54,636votes
67.4% of the vote · D+37.9 · modeled estimate
Runner-up · Kamala Harris, 2024 · 49,615 votes
Republican
Donald Trump2020
23,916votes
29.5% of the vote · D+37.9 · modeled estimate
Runner-up · Donald Trump, 2024 · 22,331 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
William J. Bryan1896
+44.9pts D vs U.S.
Place D+38.8 · U.S. R+6.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · +37.9 pts
Republican
Theodore Roosevelt1904
+17.5pts R vs U.S.
Place R+37.2 · U.S. R+19.7 · modeled estimate
Runner-up · Calvin Coolidge, 1924 · +7.1 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.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2018 | D | 75.5%36,702 | 24.5%11,927 | 48,629 |
Washington 21st State Senate District sits in the Pacific Northwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 57.8 points in 1936 and a Republican high of 37.2 points in 1904. Between 2020 and 2024 the district moved 1.4 points toward the Republican candidate; the 2024 margin was 36.5 points.
A population of 156,974, a 56% non-Hispanic-white share, and a median household income of $106,028 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (Senate) District 32 and Legislative (Senate) District 1.
The state-senate 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 21st State Senate District. Akashic. https://akashic.app/sld-upper/53021/. Accessed May 20, 2026. License: CC BY 4.0.