- Lead
- 9,100
- Total
- 22,603
- vs nation
- R+38.8
Idaho 12th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,090
- Total
- 20,993
- vs nation
- R+38.2
- Lead
- 6,154
- Total
- 16,396
- vs nation
- R+39.6
- Lead
- 4,747
- Total
- 15,161
- vs nation
- R+35.2
- Lead
- 4,308
- Total
- 14,777
- vs nation
- R+36.4
- Lead
- 5,804
- Total
- 12,499
- vs nation
- R+44.0
- Lead
- 4,120
- Total
- 9,706
- vs nation
- R+43.0
- Lead
- 2,394
- Total
- 9,268
- vs nation
- R+34.4
Key facts
- 2024 presidential margin
- R+40.3MIT Election Lab
- Population
- 53,3632024 5-year
- Population density
- 2,682 / sq mi2024 5-year · TIGER/Line
- Land area
- 19.9 sq miTIGER/Line
- Median household income
- $75,5702024 5-year
- White (non-Hispanic)
- 65.9%2024 5-year
- Black
- 0.8%2024 5-year
- Hispanic / Latino
- 26.5%2024 5-year
- Peak Democratic margin
- D+59.8 in 1896MIT Election Lab
- Peak Republican margin
- R+46.4 in 2004MIT Election Lab
- Most similar
- State Senate District 13, ID · twin score 98.7
presidential history
Party record book
Idaho 12th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1896–2024 · 33 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
William J. Bryan1896
79.9%
314 votes · D+59.8 · modeled estimate
Runner-up · Woodrow Wilson, 1912 · 61.7%
Republican
George W. Bush2004
72.5%
9,056 votes · R+46.4 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 72.2%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
6,623votes
31.5% of the vote · R+33.8 · modeled estimate
Runner-up · Kamala Harris, 2024 · 6,518 votes
Republican
Donald Trump2024
15,618votes
69.1% of the vote · R+40.3 · modeled estimate
Runner-up · Donald Trump, 2020 · 13,713 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
William J. Bryan1896
+65.9pts D vs U.S.
Place D+59.8 · U.S. R+6.1 · modeled estimate
Runner-up · William J. Bryan, 1900 · +11.4 pts
Republican
George W. Bush2004
+44.0pts R vs U.S.
Place R+46.4 · U.S. R+2.5 · modeled estimate
Runner-up · George W. Bush, 2000 · +43.0 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 | R | 25.1%5,556 | 74.9%16,613 | 22,169 |
| 2020 | R | 29.7%5,398 | 70.3%12,776 | 18,174 |
Idaho 12th State Senate District sits in the Northern Rockies. In 2024 it voted Republican.
Across the recorded series it reached a Democratic high of 59.8 points in 1896 and a Republican high of 46.4 points in 2004. Between 2020 and 2024 the district moved 6.5 points toward the Republican candidate; the 2024 margin was 40.3 points.
A population of 53,363, a 66% non-Hispanic-white share, and a median household income of $75,570 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 13 and State Senate District 24.
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 →
Idaho 12th State Senate District. Akashic. https://akashic.app/sld-upper/16012/. Accessed May 20, 2026. License: CC BY 4.0.