2024 results by precinct
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 116,116 | 143,759 | 267,416 | |
| 2020 | R | 120,539 | 130,699 | 259,700 | |
| 2016 | R | 75,677 | 93,752 | 195,626 | |
| 2012 | R | 77,137 | 97,554 | 180,546 | |
| 2008 | R | 82,236 | 93,328 | 180,760 | |
| 2004 | R | 58,523 | 94,641 | 155,030 | |
| 2000 | R | 40,650 | 75,050 | 123,485 | |
| 1996 | R | 43,040 | 61,811 | 117,743 | |
| 1992 | R | 31,941 | 49,000 | 110,166 | |
| 1988 | R | 30,525 | 54,951 | 87,334 | |
| 1984 | R | 21,760 | 60,036 | 82,924 | |
| 1980 | R | 21,324 | 55,205 | 86,544 | |
| 1976 | R | 21,125 | 41,135 | 63,889 | |
| 1972 | R | 12,687 | 36,665 | 54,311 | |
| 1968 | R | 11,529 | 30,185 | 47,881 | |
| 1964 | R | 19,639 | 25,404 | 45,043 | |
| 1960 | R | 17,017 | 27,703 | 44,720 | |
| 1956 | R | 11,328 | 26,387 | 37,715 | |
| 1952 | R | 10,281 | 27,415 | 37,736 | |
| 1948 | R | 11,253 | 14,972 | 26,705 | |
| 1944 | R | 10,667 | 13,410 | 24,144 | |
| 1940 | R | 12,381 | 12,861 | 25,293 | |
| 1936 | D | 12,027 | 7,581 | 20,574 | |
| 1932 | D | 8,836 | 8,055 | 17,522 | |
| 1928 | R | 3,921 | 10,279 | 14,308 | |
| 1924 | R | 2,255 | 7,220 | 13,255 | |
| 1920 | R | 4,173 | 8,419 | 12,619 | |
| 1916 | R | 5,207 | 5,299 | 10,966 | |
| 1912 | R | 2,569 | 3,198 | 9,994 | |
| 1908 | R | 3,721 | 4,778 | 9,002 | |
| 1904 | R | 1,466 | 4,536 | 6,525 | |
| 1900 | R | 2,072 | 2,706 | 4,931 | |
| 1896 | D | 1,531 | 851 | 2,409 | |
| 1892 | R | 0 | 1,170 | 2,827 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
American
100.0%
African American
1.0%
Multiple ancestry combinations reported; no single grouping above 1%.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 38.4 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
Median household income
2024 inflation-adjusted dollars
$91,502
Ada County ranks in the top 10% of US counties.
Ada County$91,502
Idaho$77,800
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
8.3%
Children face moderate poverty.
Children under 1818.0%
Working age (18–64)100.0%
Seniors (65+)18.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
0.0%
speak English only
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 52.5% of residents not counted as adherents by any reporting body.
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.
The Republican margin in Ada County reached its widest at forty-seven points in 1904. The margin in 2024 was ten points, in line with the county's deep historical pattern.
Ada County's loyalty is rooted in its place. Median household income of $91,502, a 83% non-Hispanic-white share, and a population of 518,935 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Fluvanna County and Lancaster County.
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