Ada County, Idaho
AkashicAda County, IDTrumpR+10.3
2024 precinct map of Ada CountyPrecinct-level 2024 presidential results for Ada County, with each precinct boundary colored by Democratic-vs-Republican margin, and gold where an independent or third-party candidate carried the precinct.
How it voted
Share of the 2024 vote
| Donald Trump ✓Republican | 53.8% | 143,759 |
|---|---|---|
| Kamala HarrisDemocratic | 43.4% | 116,116 |
| Robert F Kennedy Jr.Independent | 1.3% | 3,571 |
Harris +50Trump +50
197 precincts · 267,419 votes. Hover any precinct for its result.
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1892–2024.
38 presidential elections
| Year | Won | Democratic | Republican | Other | Margin | Total |
|---|---|---|---|---|---|---|
| R | 43.4%Harris116,116 | 53.8%Trump143,759 | 1.3%Kennedy3,571 | 267,419 | ||
| R | 46.4%Biden120,539 | 50.3%Trump130,699 | 2.0%Jorgensen5,310 | 259,700 | ||
| R | 38.7%Clinton75,677 | 47.9%Trump93,752 | 5.7%McMullin11,226 | 195,626 | ||
| R | 42.7%Obama77,137 | 54.0%Romney97,554 | 1.9%Johnson3,422 | 180,546 | ||
| R | 45.5%Obama82,236 | 51.6%McCain93,328 | 2.9%Nader5,196 | 180,760 | ||
| R | 37.7%Kerry58,523 | 61.0%Bush94,641 | 1.2%Badnarik1,866 | 155,030 | ||
| R | 32.9%Gore40,650 | 60.8%Bush75,050 | 3.9%Nader4,846 | 123,485 | ||
| R | 36.6%Clinton43,040 | 52.5%Dole61,811 | 9.5%Perot11,171 | 117,743 | ||
| R | 29.0%Clinton31,941 | 44.5%Bush49,000 | 25.6%Perot28,192 | 110,166 | ||
| R | 35.0%Dukakis30,525 | 62.9%Bush54,951 | 2.1%Paul1,858 | 87,334 | ||
| R | 26.2%Mondale21,760 | 72.4%Reagan60,036 | 1.4%Bergland1,128 | 82,924 | ||
| R | 24.6%Carter21,324 | 63.8%Reagan55,205 | 11.6%Anderson10,015 | 86,544 | ||
| R | 33.1%Carter21,125 | 64.4%Ford41,135 | 2.5%Maddox1,629 | 63,889 | ||
| R | 23.4%McGovern12,687 | 67.5%Nixon36,665 | 9.1%Schmitz4,959 | 54,311 | ||
| R | 24.1%Humphrey11,529 | 63.0%Nixon30,185 | 12.9%Wallace6,167 | 47,881 | ||
| R | 43.6%Johnson19,639 | 56.4%Goldwater25,404 | 0.0% | 45,043 | ||
| R | 38.1%Kennedy17,017 | 61.9%Nixon27,703 | 0.0% | 44,720 | ||
| R | 30.0%Stevenson11,328 | 70.0%Eisenhower26,387 | 0.0% | 37,715 | ||
| R | 27.2%Stevenson10,281 | 72.6%Eisenhower27,415 | 0.1%Hallinan40 | 37,736 | ||
| R | 42.1%Truman11,253 | 56.1%Dewey14,972 | 1.8%Thurmond480 | 26,705 | ||
| R | 44.2%Roosevelt10,667 | 55.5%Dewey13,410 | 0.3%Thomas67 | 24,144 | ||
| R | 49.0%Roosevelt12,381 | 50.8%Willkie12,861 | 0.2%Thomas51 | 25,293 | ||
| D | 58.5%Roosevelt12,027 | 36.8%Landon7,581 | 4.7%Lemke966 | 20,574 | ||
| D | 50.4%Roosevelt8,836 | 46.0%Hoover8,055 | 3.6%Thomas631 | 17,522 | ||
| R | 27.4%Smith3,921 | 71.8%Hoover10,279 | 0.8%Thomas108 | 14,308 | ||
| R | 17.0%Davis2,255 | 54.5%Coolidge7,220 | 28.5%La Follette3,780 | 13,255 | ||
| R | 33.1%Cox4,173 | 66.7%Harding8,419 | 0.2%Debs27 | 12,619 | ||
| R | 47.5%Wilson5,207 | 48.3%Hughes5,299 | 4.2%Benson460 | 10,966 | ||
| O | 25.7%Wilson2,569 | 32.0%Taft3,198 | 42.3%Roosevelt4,227 | 9,994 | ||
| R | 41.3%Bryan3,721 | 53.1%Taft4,778 | 5.6%Debs503 | 9,002 | ||
| R | 22.5%Parker1,466 | 69.5%Roosevelt4,536 | 8.0%Debs523 | 6,525 | ||
| R | 42.0%Bryan2,072 | 54.9%McKinley2,706 | 3.1%Woolley153 | 4,931 | ||
| D | 63.6%Bryan1,531 | 35.3%McKinley851 | 1.1%Palmer27 | 2,409 | ||
| O | 0.0%Cleveland0 | 41.4%Harrison1,170 | 58.6%Weaver1,657 | 2,827 | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — | ||
| — | — | — | — | — |
presidential history
Presidential margin, 1892–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1892 | −41.4% |
| 1896 | +28.2% |
| 1900 | −12.9% |
| 1904 | −47.0% |
| 1908 | −11.7% |
| 1912 | −6.3% |
| 1916 | −0.8% |
| 1920 | −33.6% |
| 1924 | −37.5% |
| 1928 | −44.4% |
| 1932 | +4.5% |
| 1936 | +21.6% |
| 1940 | −1.9% |
| 1944 | −11.4% |
| 1948 | −13.9% |
| 1952 | −45.4% |
| 1956 | −39.9% |
| 1960 | −23.9% |
| 1964 | −12.8% |
| 1968 | −39.0% |
| 1972 | −44.1% |
| 1976 | −31.3% |
| 1980 | −39.1% |
| 1984 | −46.2% |
| 1988 | −28.0% |
| 1992 | −15.5% |
| 1996 | −15.9% |
| 2000 | −27.9% |
| 2004 | −23.3% |
| 2008 | −6.1% |
| 2012 | −11.3% |
| 2016 | −9.2% |
| 2020 | −3.9% |
| 2024 | −10.3% |
DemocraticRepublican
Ada County anchors Idaho's Treasure Valley and has grown rapidly through in-migration, yet its 2024 presidential margin of R+10.3 suggests that newcomer growth has not flipped its partisan lean the way similar Sun Belt metros have.
Across the recorded series it reached a Democratic high of 28.2 points in 1896 and a Republican high of 47.0 points in 1904. Between 2020 and 2024 the county moved 6.4 points toward the Republican candidate; the 2024 margin was 10.3 points.
A population of 518,935, a 81% non-Hispanic-white share, and a median household income of $91,502 describe the county. The county's voting pattern over the last decade is most similar to that of Fluvanna County and Alamance County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Ada County, Idaho. Akashic. https://akashic.app/county/16001/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
Embed this page
A live widget for your site — no API key, attribution built in, CC BY 4.0. All widgets & sizes →
Idaho at the ballot boxAll elections →
Frequently asked questions
How did Ada County, Idaho vote in 2024?
In 2024, Ada County, Idaho voted Republican by 10.3 points (R+10.3), carried by the Republican candidate. Out of 267,419 votes cast, 116,116 went Democratic and 143,759 went Republican.
When did Ada County, Idaho last vote Democratic?
The most recent presidential election in which Ada County, Idaho voted Democratic was 1936.
How many people live in Ada County, Idaho?
Ada County, Idaho has a population of 518,935 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Ada County, Idaho?
Median household income in Ada County, Idaho is $91,502 — above the national median of $80,734. The Idaho state median is $77,800.
What is the political history of Ada County, Idaho?
Akashic tracks 38 presidential elections in Ada County, Idaho from 1876 to 2024. Of those, 3 went Democratic and 29 went Republican.