- Lead
- 21,849
- Total
- 66,740
- vs nation
- D+34.2
Oregon 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 24,811
- Total
- 72,131
- vs nation
- D+29.9
- Lead
- 15,318
- Total
- 60,155
- vs nation
- D+23.4
- Lead
- 8,908
- Total
- 52,897
- vs nation
- D+13.0
- Lead
- 11,341
- Total
- 52,793
- vs nation
- D+14.2
- Lead
- 2,798
- Total
- 51,582
- vs nation
- D+7.9
- Lead
- 748
- Total
- 41,561
- vs nation
- D+1.3
- Lead
- 2,323
- Total
- 35,683
- vs nation
- R+2.0
Key facts
- 2024 presidential margin
- D+32.7MIT Election Lab
- Population
- 140,2752024 5-year
- Population density
- 1,580 / sq mi2024 5-year · TIGER/Line
- Land area
- 88.8 sq miTIGER/Line
- Median household income
- $110,6912024 5-year
- White (non-Hispanic)
- 55.3%2024 5-year
- Black
- 2.9%2024 5-year
- Hispanic / Latino
- 21.1%2024 5-year
- Peak Democratic margin
- D+34.4 in 2020MIT Election Lab
- Peak Republican margin
- R+60.7 in 1904MIT Election Lab
- Most similar
- State Senate District 15, OR · twin score 97.3
presidential history
Party record book
Oregon 18th 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
65.4%
47,163 votes · D+34.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 64.2%
Republican
Theodore Roosevelt1904
75.0%
536 votes · R+60.7 · modeled estimate
Runner-up · Rutherford B. Hayes, 1876 · 64.6%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
47,163votes
65.4% of the vote · D+34.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 42,847 votes
Republican
George W. Bush2004
24,053votes
46.6% of the vote · D+5.4 · modeled estimate
Runner-up · Donald Trump, 2020 · 22,352 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
+34.2pts D vs U.S.
Place D+32.7 · U.S. R+1.5 · modeled estimate
Runner-up · Joe Biden, 2020 · +29.9 pts
Republican
Benjamin Harrison1892
+45.7pts R vs U.S.
Place R+44.1 · U.S. D+1.7 · modeled estimate
Runner-up · Theodore Roosevelt, 1904 · +41.0 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 |
|---|---|---|---|---|
| 2024 | D | 67.2%43,355 | 32.8%21,196 | 64,551 |
| 2020 | D | 67.1%48,095 | 32.9%23,565 | 71,660 |
Anchored in the high desert and ranching communities of south-central Oregon, this district backed the 2024 Republican presidential nominee by more than 30 points, reflecting the rural, resource-economy electorate that defines much of the state's interior.
Across the recorded series it reached a Democratic high of 34.4 points in 2020 and a Republican high of 60.7 points in 1904. Between 2020 and 2024 the district moved 1.7 points toward the Republican candidate; the 2024 margin was 32.7 points.
A population of 140,275, a 55% non-Hispanic-white share, and a median household income of $110,691 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 15 and State Senate District 17.
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 18th State Senate District. Akashic. https://akashic.app/sld-upper/41018/. Accessed May 20, 2026. License: CC BY 4.0.