- Lead
- 26,004
- Total
- 96,439
- vs nation
- R+25.5
Washington 20th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 25,672
- Total
- 92,499
- vs nation
- R+32.2
- Lead
- 20,325
- Total
- 70,932
- vs nation
- R+30.7
- Lead
- 14,298
- Total
- 67,525
- vs nation
- R+25.0
- Lead
- 10,691
- Total
- 66,468
- vs nation
- R+23.4
- Lead
- 16,948
- Total
- 62,663
- vs nation
- R+24.6
- Lead
- 13,343
- Total
- 53,669
- vs nation
- R+25.4
- Lead
- 4,258
- Total
- 46,845
- vs nation
- R+17.6
Key facts
- 2024 presidential margin
- R+27.0MIT Election Lab
- Population
- 157,0772024 5-year
- Population density
- 50 / sq mi2024 5-year · TIGER/Line
- Land area
- 3,134 sq miTIGER/Line
- Median household income
- $90,8962024 5-year
- White (non-Hispanic)
- 82.2%2024 5-year
- Black
- 0.6%2024 5-year
- Hispanic / Latino
- 8.6%2024 5-year
- Peak Democratic margin
- D+27.0 in 1964MIT Election Lab
- Peak Republican margin
- R+53.1 in 1904MIT Election Lab
- Most similar
- Legislative (Senate) District 4, WA · twin score 93.1
presidential history
Party record book
Washington 20th 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
Lyndon B. Johnson1964
63.3%
17,066 votes · D+27.0 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 59.6%
Republican
Theodore Roosevelt1904
71.9%
3,270 votes · R+53.1 · modeled estimate
Runner-up · Herbert Hoover, 1928 · 71.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Kamala Harris2024
33,688votes
34.9% of the vote · R+27.0 · modeled estimate
Runner-up · Joe Biden, 2020 · 32,068 votes
Republican
Donald Trump2024
59,692votes
61.9% of the vote · R+27.0 · modeled estimate
Runner-up · Donald Trump, 2020 · 57,740 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
Lyndon B. Johnson1964
+4.4pts D vs U.S.
Place D+27.0 · U.S. D+22.6 · modeled estimate
Runner-up · William J. Bryan, 1896 · +2.3 pts
Republican
Theodore Roosevelt1904
+33.4pts R vs U.S.
Place R+53.1 · U.S. R+19.7 · modeled estimate
Runner-up · Donald Trump, 2020 · +32.2 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.
Centered in the Columbia Basin, this district delivered a 27-point margin in 2024, reflecting the region's rural, agricultural character and voting patterns consistent with other Eastern Washington constituencies.
Across the recorded series it reached a Democratic high of 27.0 points in 1964 and a Republican high of 53.1 points in 1904. Between 2020 and 2024 the district moved 0.8 points toward the Democratic candidate; the 2024 margin was 27.0 points.
A population of 157,077, a 82% non-Hispanic-white share, and a median household income of $90,896 describe the district. The district's voting pattern over the last decade is most similar to that of Legislative (Senate) District 4 and State Senate District 14.
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 20th State Senate District. Akashic. https://akashic.app/sld-upper/53020/. Accessed May 20, 2026. License: CC BY 4.0.