Ada County, ID
ID · Presidential Elections 1892–2024
Ada County, ID (Idaho) voted R+10.3 for Donald Trump (Republican) in the 2024 presidential election, with Trump receiving 143,759 votes (53.76%) to 116,116 (43.42%) for Harris.
This represents a R+6.4% swing toward Republicans compared to 2020. Ada County is classified as a lean Republican county. Ada County has voted Republican in every presidential election since 1940. The county has a population of approximately 518,935.
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Quick Stats
Demographics
Community Profile
Religious Composition
Source: Religion Census 2020Ancestry Groups
Source: Census ACSTop reported ancestry groups (compared to national average).
Age Distribution
Employment by Industry
Census ACSPresidential Elections
Presidential Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2024 | 43.4%(116,116) | 53.8%(143,759) | R+10.3 | R+6.4 |
| 2020 | 46.4%(120,539) | 50.3%(130,699) | R+3.9 | D+5.3 |
| 2016 | 38.7%(75,677) | 47.9%(93,752) | R+9.2 | D+2.1 |
| 2012 | 42.7%(77,137) | 54.0%(97,554) | R+11.3 | R+5.2 |
| 2008 | 45.5%(82,236) | 51.6%(93,328) | R+6.1 | D+17.2 |
| 2004 | 37.8%(58,523) | 61.0%(94,641) | R+23.3 | D+4.6 |
| 2000 | 32.9%(40,650) | 60.8%(75,050) | R+27.9 | R+11.9 |
| 1996 | 36.5%(43,040) | 52.5%(61,811) | R+15.9 | R+0.5 |
| 1992 | 29.0%(31,941) | 44.5%(49,000) | R+15.5 | D+12.5 |
| 1988 | 35.0%(30,525) | 62.9%(54,951) | R+28.0 | D+18.2 |
Source: Official state election returns via MIT Election Data + Science Lab
Presidential Margin Trend
Ada County, ID • 1892–2024
Senate Elections
Senate Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 41.5%(76,656) | 47.5%(87,579) | R+5.9 | R+1.4 |
| 2020 | 46.0%(118,718) | 50.6%(130,446) | R+4.5 | D+12.4 |
| 2016 | 38.9%(72,847) | 55.9%(104,650) | R+17.0 | R+9.2 |
| 2014 | 46.1%(59,423) | 53.9%(69,404) | R+7.7 | D+28.7 |
| 2010 | 30.2%(36,377) | 66.7%(80,273) | R+36.5 | R+26.4 |
| 2008 | 42.0%(73,722) | 52.1%(91,425) | R+10.1 | D+89.6 |
| 2004 | 0.0%(0) | 99.7%(127,353) | R+99.7 | R+80.1 |
| 2002 | 39.0%(40,741) | 58.5%(61,113) | R+19.5 | D+14.5 |
| 1998 | 32.1%(29,543) | 66.1%(60,833) | R+34.0 | R+28.5 |
| 1996 | 46.0%(54,748) | 51.5%(61,244) | R+5.5 | D+16.9 |
Source: Official state election returns via MIT Election Data + Science Lab
Governor Elections
Governor Results
| Year | Democrat | Republican | Margin | Swing |
|---|---|---|---|---|
| 2022 | 29.0%(107,386) | 56.8%(210,552) | R+27.8 | R+28.9 |
| 2018 | 49.7%(94,772) | 48.7%(92,684) | D+1.1 | R+7.3 |
| 2014 | 51.2%(66,347) | 42.7%(55,407) | D+8.4 | D+22.5 |
| 2010 | 38.6%(46,777) | 52.7%(63,871) | R+14.1 | R+20.2 |
| 2006 | 51.7%(62,632) | 45.7%(55,272) | D+6.1 | D+5.0 |
| 2002 | 49.7%(52,360) | 48.6%(51,258) | D+1.0 | D+34.0 |
| 1998 | 32.2%(29,743) | 65.1%(60,189) | R+32.9 | R+24.9 |
| 1994 | 44.6%(43,233) | 52.6%(51,018) | R+8.0 | R+58.8 |
| 1990 | 75.4%(55,177) | 24.6%(18,012) | D+50.8 | D+45.9 |
| 1986 | 52.1%(42,361) | 47.2%(38,418) | D+4.8 | D+4.1 |
Source: Official state election returns via MIT Election Data + Science Lab