- Lead
- 4,626
- Total
- 24,446
- vs nation
- D+20.4
Idaho 16th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 5,342
- Total
- 26,440
- vs nation
- D+15.7
- Lead
- 1,620
- Total
- 21,406
- vs nation
- D+5.5
- Lead
- 1,497
- Total
- 19,892
- vs nation
- D+3.7
- Lead
- 2,572
- Total
- 19,961
- vs nation
- D+5.6
- Lead
- 743
- Total
- 16,554
- vs nation
- R+2.0
- Lead
- 1,366
- Total
- 13,003
- vs nation
- R+11.0
- Lead
- 143
- Total
- 12,709
- vs nation
- R+7.4
Key facts
- 2024 presidential margin
- D+18.9MIT Election Lab
- Population
- 51,2062024 5-year
- Population density
- 4,000 / sq mi2024 5-year · TIGER/Line
- Land area
- 12.8 sq miTIGER/Line
- Median household income
- $72,2622024 5-year
- White (non-Hispanic)
- 77.3%2024 5-year
- Black
- 2.5%2024 5-year
- Hispanic / Latino
- 11.5%2024 5-year
- Peak Democratic margin
- D+47.1 in 1896MIT Election Lab
- Peak Republican margin
- R+32.6 in 1892MIT Election Lab
- Most similar
- State Senate District 17, ID · twin score 92.6
presidential history
Party record book
Idaho 16th 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
William J. Bryan1896
73.5%
228 votes · D+47.1 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 67.0%
Republican
Dwight D. Eisenhower1952
64.1%
2,470 votes · R+28.5 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 64.0%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
15,428votes
58.4% of the vote · D+20.2 · modeled estimate
Runner-up · Kamala Harris, 2024 · 14,126 votes
Republican
Donald Trump2020
10,086votes
38.1% of the vote · D+20.2 · modeled estimate
Runner-up · Donald Trump, 2024 · 9,500 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
+53.2pts D vs U.S.
Place D+47.1 · U.S. R+6.1 · modeled estimate
Runner-up · William J. Bryan, 1908 · +20.7 pts
Republican
Benjamin Harrison1892
+34.2pts R vs U.S.
Place R+32.6 · U.S. D+1.7 · a third-party candidate carried the Place · modeled estimate
Runner-up · Richard Nixon, 1968 · +22.4 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.
Anchored in urban Boise, this district's D+18.9 presidential margin makes it one of the clearest Democratic strongholds in an otherwise heavily Republican state, reflecting the concentrated left-leaning electorate of Idaho's capital core.
Across the recorded series it reached a Democratic high of 47.1 points in 1896 and a Republican high of 32.6 points in 1892. Between 2020 and 2024 the district moved 1.3 points toward the Republican candidate; the 2024 margin was 18.9 points.
A population of 51,206, a 77% non-Hispanic-white share, and a median household income of $72,262 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 17 and State Senate District 18.
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 16th State Senate District. Akashic. https://akashic.app/sld-upper/16016/. Accessed May 20, 2026. License: CC BY 4.0.