Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Idaho County, Idaho has 11,195 active registered voters — 80.2% Republican, 4.6% Democratic, and 13.9% with no party affiliation, as of July 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 021 | 457 | 263 | 57.55% |
| 2 | 013 | 909 | 503 | 55.34% |
| 3 | 003 | 408 | 225 | 55.15% |
| 4 | 014 | 980 | 536 | 54.69% |
| 5 | 022 | 492 | 265 | 53.86% |
| 6 | 017 | 1,067 | 556 | 52.11% |
| 7 | 019 | 1,260 | 648 | 51.43% |
| 8 | 012 | 557 | 284 | 50.99% |
| 9 | 010 | 651 | 323 | 49.62% |
| 10 | 011 | 525 | 243 | 46.29% |
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.
How Idaho County voted for president
Election results are public records.
Idaho County at a glance.
Idaho County had an estimated 17,912 residents in July 2024, the 20th most populous of Idaho's 44 counties, up 8.3% since the 2020 census. Of those, 14,360 are 18 or older, the voting-age population, and 30.2% are 65 or older. Its 11,195 active registered voters equal about 78.0% of that voting-age population.
It covers 8,478 square miles of land (2.1 people per square mile), and 67.0% of residents live outside any incorporated city or town. The largest cities and towns are Grangeville (3,627), Cottonwood (921), Kooskia (556), Riggins (394) and Stites (187). The American Community Survey (2020-2024) puts it at a median age of 49.4, a median household income of $66,325, 22.6% of adults 25 and older holding a bachelor's degree or higher and 80.9% of occupied homes owned by the people living in them.
In 2024, 9,858 votes were cast for president, about 68.6% of the voting-age population; the Democratic ticket took 14.8% and the Republican ticket 82.7%. The two-party margin moved from R+47.2 in 2008 to R+67.9 in 2024.
- Population (2024 estimate)
- 17,912
- Population (2020 census base)
- 16,544
- Voting-age population (18+)
- 14,360
- Active voters per 100 adults
- 78.0
- Residents 65 and older
- 30.2%
- People per square mile
- 2.1
- Living outside incorporated places
- 67.0%
- Land area
- 8,478 sq mi
- Median age
- 49.4
- Median household income
- $66,325
- Adults 25+ with a bachelor's degree
- 22.6%
- Owner-occupied homes
- 80.9%
Largest cities and towns
- Grangeville 3,627
- Cottonwood 921
- Kooskia 556
- Riggins 394
- Stites 187
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 14.8% | 82.7% | R+67.9 | 9,858 |
| 2020 | 16.3% | 81.5% | R+65.2 | 9,602 |
| 2016 | 14.5% | 78.3% | R+63.8 | 8,223 |
| 2012 | 22.2% | 75.1% | R+52.9 | 7,749 |
| 2008 | 24.6% | 71.8% | R+47.2 | 8,210 |
Sources: U.S. Census Bureau Vintage 2024 population estimates and 2024 Gazetteer; American Community Survey 2020–2024 5-year estimates; certified county presidential returns. Growth, density and turnout are simple arithmetic on those figures.
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