301,507
Active registered voters
197
Precincts
148,092
Supervoters (49.12%)
5
Presidential cycles of results
Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Ada County, Idaho has 301,507 active registered voters — 52.8% Republican, 17.6% Democratic, and 0.0% with no party affiliation, as of July 2026.
Party registration
Democratic 53,131 · Republican 159,092 · No Party Affiliation 0 · Other parties 89,284
Source: Motion51 voter database — official Idaho voter file
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 1812 | 1,417 | 942 | 66.48% |
| 2 | 1807 | 1,522 | 1,004 | 65.97% |
| 3 | 1923 | 1,464 | 949 | 64.82% |
| 4 | 1903 | 1,486 | 944 | 63.53% |
| 5 | 1504 | 1,484 | 942 | 63.48% |
| 6 | 1509 | 1,521 | 961 | 63.18% |
| 7 | 2208 | 1,438 | 906 | 63.0% |
| 8 | 1905 | 1,857 | 1,167 | 62.84% |
| 9 | 1811 | 1,416 | 888 | 62.71% |
| 10 | 1810 | 1,533 | 957 | 62.43% |
Supervoters are active registered voters who cast a ballot in at least 3 of the last 4 November general elections (2018–2024). Percentages are precinct totals from the official state voter file — no individual voter information is shown. Precincts with fewer than 400 active voters are excluded.
Source: Motion51 voter database — official Idaho voter file
How Ada County voted for president
■ Democratic % ■ Republican % · 2024 total votes cast: 267,340
Election results are public records.
Source: Official county canvasses via MIT Election Data + Science Lab
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