21,237
Active registered voters
21
Precincts
6,152
Supervoters (28.97%)
5
Presidential cycles of results
Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Madison County, Idaho has 21,237 active registered voters — 72.9% Republican, 4.4% Democratic, and 0.0% with no party affiliation, as of July 2026.
Party registration
Democratic 935 · Republican 15,485 · No Party Affiliation 0 · Other parties 4,817
Source: Motion51 voter database — official Idaho voter file
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 019 | 802 | 409 | 51.0% |
| 2 | 004 | 590 | 275 | 46.61% |
| 3 | 018 | 924 | 381 | 41.23% |
| 4 | 016 | 1,150 | 460 | 40.0% |
| 5 | 003 | 1,707 | 669 | 39.19% |
| 6 | 006 | 1,394 | 527 | 37.8% |
| 7 | 002 | 1,906 | 705 | 36.99% |
| 8 | 005 | 1,086 | 334 | 30.76% |
| 9 | 014 | 1,065 | 324 | 30.42% |
| 10 | 007 | 1,631 | 476 | 29.18% |
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 Madison County voted for president
■ Democratic % ■ Republican % · 2024 total votes cast: 17,358
Election results are public records.
Source: Official county canvasses via MIT Election Data + Science Lab
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