Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Washington County, Idaho has 6,289 active registered voters — 78.9% Republican, 6.6% Democratic, and 13.7% with no party affiliation, as of July 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 008 | 746 | 435 | 58.31% |
| 2 | 007 | 549 | 312 | 56.83% |
| 3 | 006 | 401 | 220 | 54.86% |
| 4 | 010 | 612 | 334 | 54.58% |
| 5 | 004 | 568 | 307 | 54.05% |
| 6 | 011 | 608 | 306 | 50.33% |
| 7 | 001 | 719 | 358 | 49.79% |
| 8 | 002 | 561 | 265 | 47.24% |
| 9 | 005 | 541 | 237 | 43.81% |
| 10 | 009 | 616 | 261 | 42.37% |
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 Washington County voted for president
Election results are public records.
Washington County at a glance.
Washington County had an estimated 11,539 residents in July 2024, the 29th most populous of Idaho's 44 counties, up 9.9% since the 2020 census. Of those, 9,041 are 18 or older, the voting-age population, and 25.7% are 65 or older. Its 6,289 active registered voters equal about 69.6% of that voting-age population.
It covers 1,453 square miles of land (7.9 people per square mile), and 42.0% of residents live outside any incorporated city or town. The largest cities and towns are Weiser (6,112), Cambridge (365) and Midvale (218). The American Community Survey (2020-2024) puts it at a median age of 45.0, a median household income of $54,000, 20.6% of adults 25 and older holding a bachelor's degree or higher and 74.6% of occupied homes owned by the people living in them.
In 2024, 5,553 votes were cast for president, about 61.4% of the voting-age population; the Democratic ticket took 18.2% and the Republican ticket 79.8%. The two-party margin moved from R+42.8 in 2008 to R+61.6 in 2024.
- Population (2024 estimate)
- 11,539
- Population (2020 census base)
- 10,499
- Voting-age population (18+)
- 9,041
- Active voters per 100 adults
- 69.6
- Residents 65 and older
- 25.7%
- People per square mile
- 7.9
- Living outside incorporated places
- 42.0%
- Land area
- 1,453 sq mi
- Median age
- 45.0
- Median household income
- $54,000
- Adults 25+ with a bachelor's degree
- 20.6%
- Owner-occupied homes
- 74.6%
Largest cities and towns
- Weiser 6,112
- Cambridge 365
- Midvale 218
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 18.2% | 79.8% | R+61.6 | 5,553 |
| 2020 | 20.1% | 77.7% | R+57.6 | 5,344 |
| 2016 | 17.4% | 73.7% | R+56.3 | 4,454 |
| 2012 | 25.5% | 72.2% | R+46.7 | 4,330 |
| 2008 | 27.5% | 70.3% | R+42.8 | 4,506 |
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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