- Lead
- 28,206
- Total
- 62,832
- vs nation
- D+46.4
Washington 48th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 32,145
- Total
- 67,494
- vs nation
- D+43.2
- Lead
- 24,137
- Total
- 58,302
- vs nation
- D+39.3
- Lead
- 17,554
- Total
- 55,435
- vs nation
- D+27.8
- Lead
- 17,496
- Total
- 52,890
- vs nation
- D+25.8
- Lead
- 11,173
- Total
- 51,616
- vs nation
- D+24.1
- Lead
- 7,477
- Total
- 46,076
- vs nation
- D+15.7
- Lead
- 6,950
- Total
- 43,112
- vs nation
- D+7.6
Key facts
- 2024 presidential margin
- D+44.9MIT Election Lab
- Population
- 157,2172024 5-year
- Population density
- 4,735 / sq mi2024 5-year · TIGER/Line
- Land area
- 33.2 sq miTIGER/Line
- Median household income
- $158,7022024 5-year
- White (non-Hispanic)
- 46.1%2024 5-year
- Black
- 2.2%2024 5-year
- Hispanic / Latino
- 7.3%2024 5-year
- Peak Democratic margin
- D+47.6 in 2020MIT Election Lab
- Peak Republican margin
- R+57.5 in 1904MIT Election Lab
- Most similar
- Legislative (Senate) District 41, WA · twin score 98.2
presidential history
Party record book
Washington 48th 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
72.3%
48,768 votes · D+47.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 70.2%
Republican
Theodore Roosevelt1904
72.8%
1,408 votes · R+57.5 · 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
48,768votes
72.3% of the vote · D+47.6 · modeled estimate
Runner-up · Kamala Harris, 2024 · 44,097 votes
Republican
Ronald Reagan1984
21,900votes
57.0% of the vote · R+15.5 · modeled estimate
Runner-up · George W. Bush, 2004 · 19,849 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
+46.4pts D vs U.S.
Place D+44.9 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +43.2 pts
Republican
Theodore Roosevelt1904
+37.9pts R vs U.S.
Place R+57.5 · U.S. R+19.7 · modeled estimate
Runner-up · Herbert Hoover, 1928 · +25.1 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 | 81.0%51,204 | 19.0%11,997 | 63,201 |
Anchored in Seattle's core neighborhoods, the 48th Senate District recorded a 44.9-point Democratic presidential margin in 2024, reflecting the densely populated, highly educated electorate that defines much of the city's urban center.
Across the recorded series it reached a Democratic high of 47.6 points in 2020 and a Republican high of 57.5 points in 1904. Between 2020 and 2024 the district moved 2.7 points toward the Republican candidate; the 2024 margin was 44.9 points.
A population of 157,217, a 46% non-Hispanic-white share, and a median household income of $158,702 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (Senate) District 41 and Legislative (Senate) District 45.
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 48th State Senate District. Akashic. https://akashic.app/sld-upper/53048/. Accessed May 20, 2026. License: CC BY 4.0.