3,011
Active registered voters
9
Precincts
1,704
Supervoters (56.59%)
5
Presidential cycles of results
Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Custer County, Idaho has 3,011 active registered voters — 79.7% Republican, 4.7% Democratic, and 0.0% with no party affiliation, as of July 2026.
Party registration
Democratic 143 · Republican 2,400 · No Party Affiliation 0 · Other parties 468
Source: Motion51 voter database — official Idaho voter file
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 003 | 551 | 343 | 62.25% |
| 2 | 004 | 415 | 256 | 61.69% |
| 3 | 006 | 506 | 276 | 54.55% |
| 4 | 001 | 620 | 300 | 48.39% |
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 Custer County voted for president
■ Democratic % ■ Republican % · 2024 total votes cast: 2,650
Election results are public records.
Source: Official county canvasses via MIT Election Data + Science Lab
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