- Lead
- 8,845
- Total
- 22,046
- vs nation
- R+38.6
Idaho 13th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 7,410
- Total
- 20,920
- vs nation
- R+39.9
- Lead
- 6,729
- Total
- 17,288
- vs nation
- R+41.0
- Lead
- 5,311
- Total
- 15,932
- vs nation
- R+37.2
- Lead
- 4,779
- Total
- 15,606
- vs nation
- R+37.9
- Lead
- 6,348
- Total
- 13,222
- vs nation
- R+45.6
- Lead
- 4,514
- Total
- 10,238
- vs nation
- R+44.6
- Lead
- 2,687
- Total
- 9,799
- vs nation
- R+35.9
Key facts
- 2024 presidential margin
- R+40.1MIT Election Lab
- Population
- 53,5812024 5-year
- Population density
- 1,712 / sq mi2024 5-year · TIGER/Line
- Land area
- 31.3 sq miTIGER/Line
- Median household income
- $75,8702024 5-year
- White (non-Hispanic)
- 69.7%2024 5-year
- Black
- 0.7%2024 5-year
- Hispanic / Latino
- 23.0%2024 5-year
- Peak Democratic margin
- D+57.2 in 1896MIT Election Lab
- Peak Republican margin
- R+48.0 in 2004MIT Election Lab
- Most similar
- State Senate District 12, ID · twin score 98.7
presidential history
Party record book
Idaho 13th 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
78.6%
323 votes · D+57.2 · modeled estimate
Runner-up · Woodrow Wilson, 1912 · 60.8%
Republican
George W. Bush2004
73.2%
9,679 votes · R+48.0 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 73.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
6,408votes
30.6% of the vote · R+35.4 · modeled estimate
Runner-up · Kamala Harris, 2024 · 6,325 votes
Republican
Donald Trump2024
15,170votes
68.8% of the vote · R+40.1 · modeled estimate
Runner-up · Donald Trump, 2020 · 13,818 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
+63.3pts D vs U.S.
Place D+57.2 · U.S. R+6.1 · modeled estimate
Runner-up · William J. Bryan, 1900 · +12.7 pts
Republican
George W. Bush2004
+45.6pts R vs U.S.
Place R+48.0 · U.S. R+2.5 · modeled estimate
Runner-up · George W. Bush, 2000 · +44.6 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%5,579 | 74.9%16,681 | 22,260 |
| 2020 | R | 29.7%5,420 | 70.3%12,828 | 18,248 |
Idaho Senate District 13 posts one of the state's sharpest leftward presidential margins, reflecting the dense, younger, and college-educated population concentrated around Boise State University and the city's urban core.
Across the recorded series it reached a Democratic high of 57.2 points in 1896 and a Republican high of 48.0 points in 2004. Between 2020 and 2024 the district moved 4.7 points toward the Republican candidate; the 2024 margin was 40.1 points.
A population of 53,581, a 70% non-Hispanic-white share, and a median household income of $75,870 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 12 and State Senate District 25.
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 13th State Senate District. Akashic. https://akashic.app/sld-upper/16013/. Accessed May 20, 2026. License: CC BY 4.0.