- Lead
- 11,369
- Total
- 57,556
- vs nation
- D+21.2
Washington 30th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 15,173
- Total
- 65,980
- vs nation
- D+18.5
- Lead
- 11,015
- Total
- 52,961
- vs nation
- D+18.7
- Lead
- 3,904
- Total
- 52,152
- vs nation
- D+3.6
- Lead
- 4,404
- Total
- 49,607
- vs nation
- D+1.6
- Lead
- 1,849
- Total
- 49,897
- vs nation
- R+1.2
- Lead
- 3,633
- Total
- 45,161
- vs nation
- R+8.6
- Lead
- 2,751
- Total
- 42,083
- vs nation
- R+15.1
Key facts
- 2024 presidential margin
- D+19.8MIT Election Lab
- Population
- 156,9702024 5-year
- Population density
- 4,035 / sq mi2024 5-year · TIGER/Line
- Land area
- 38.9 sq miTIGER/Line
- Median household income
- $90,8032024 5-year
- White (non-Hispanic)
- 42.1%2024 5-year
- Black
- 11.5%2024 5-year
- Hispanic / Latino
- 20.5%2024 5-year
- Peak Democratic margin
- D+23.0 in 2020MIT Election Lab
- Peak Republican margin
- R+75.2 in 1904MIT Election Lab
- Most similar
- Legislative (Senate) District 33, WA · twin score 96.1
presidential history
Party record book
Washington 30th 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
Joe Biden2020
60.0%
39,601 votes · D+23.0 · modeled estimate
Runner-up · Kamala Harris, 2024 · 58.2%
Republican
Theodore Roosevelt1904
83.5%
1,812 votes · R+75.2 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 79.9%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
39,601votes
60.0% of the vote · D+23.0 · modeled estimate
Runner-up · Kamala Harris, 2024 · 33,485 votes
Republican
Ronald Reagan1984
28,224votes
69.1% of the vote · R+39.2 · modeled estimate
Runner-up · George W. Bush, 2004 · 25,541 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
+21.2pts D vs U.S.
Place D+19.8 · U.S. R+1.5 · modeled estimate
Runner-up · Hillary Clinton, 2016 · +18.7 pts
Republican
Theodore Roosevelt1904
+55.6pts R vs U.S.
Place R+75.2 · U.S. R+19.7 · modeled estimate
Runner-up · Benjamin Harrison, 1892 · +48.2 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 | 81.0%51,124 | 19.0%11,978 | 63,102 |
Spanning diverse communities along the I-5 corridor south of Seattle, this district has shifted toward Democrats by double digits over the past decade as its immigrant and working-class population has grown, delivering consistent 20-point presidential margins.
Across the recorded series it reached a Democratic high of 23.0 points in 2020 and a Republican high of 75.2 points in 1904. Between 2020 and 2024 the district moved 3.2 points toward the Republican candidate; the 2024 margin was 19.8 points.
A population of 156,970, a 42% non-Hispanic-white share, and a median household income of $90,803 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (Senate) District 33 and Legislative (Senate) District 11.
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 30th State Senate District. Akashic. https://akashic.app/sld-upper/53030/. Accessed May 20, 2026. License: CC BY 4.0.