- Lead
- 63,435
- Total
- 87,806
- vs nation
- D+73.7
Oregon 21st State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 68,250
- Total
- 94,897
- vs nation
- D+67.5
- Lead
- 53,545
- Total
- 82,076
- vs nation
- D+63.1
- Lead
- 49,239
- Total
- 73,287
- vs nation
- D+63.3
- Lead
- 51,493
- Total
- 74,344
- vs nation
- D+62.0
- Lead
- 43,953
- Total
- 71,551
- vs nation
- D+63.9
- Lead
- 31,678
- Total
- 57,617
- vs nation
- D+54.5
- Lead
- 27,992
- Total
- 52,144
- vs nation
- D+45.2
Key facts
- 2024 presidential margin
- D+72.2MIT Election Lab
- Population
- 140,6362024 5-year
- Population density
- 6,364 / sq mi2024 5-year · TIGER/Line
- Land area
- 22.1 sq miTIGER/Line
- Median household income
- $91,9922024 5-year
- White (non-Hispanic)
- 77.8%2024 5-year
- Black
- 1.7%2024 5-year
- Hispanic / Latino
- 7.8%2024 5-year
- Peak Democratic margin
- D+72.2 in 2024MIT Election Lab
- Peak Republican margin
- R+24.3 in 1904MIT Election Lab
- Most similar
- State Senate District 22, OR · twin score 98.3
presidential history
Party record book
Oregon 21st State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Joe Biden2020
84.5%
80,233 votes · D+71.9 · modeled estimate
Runner-up · Kamala Harris, 2024 · 83.8%
Republican
Theodore Roosevelt1904
50.3%
1,001 votes · R+24.3 · modeled estimate
Runner-up · William H. Taft, 1908 · 37.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
80,233votes
84.5% of the vote · D+71.9 · modeled estimate
Runner-up · Kamala Harris, 2024 · 73,616 votes
Republican
George W. Bush2004
13,253votes
18.5% of the vote · D+61.4 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 12,530 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
+73.7pts D vs U.S.
Place D+72.2 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +67.5 pts
Republican
Benjamin Harrison1892
+8.4pts R vs U.S.
Place R+6.8 · U.S. D+1.7 · a third-party candidate carried the Place · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · +4.7 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.
Oregon 21st State Senate District sits in the Pacific Northwest. In 2024 it voted Democratic.
Across the recorded series it reached a Democratic high of 72.2 points in 2024 and a Republican high of 24.3 points in 1904. The 2024 margin was 72.2 points.
A population of 140,636, a 78% non-Hispanic-white share, and a median household income of $91,992 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 22 and State Senate District 23.
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 →
Oregon 21st State Senate District. Akashic. https://akashic.app/sld-upper/41021/. Accessed May 20, 2026. License: CC BY 4.0.