Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Jerome County, Idaho has 9,057 active registered voters — 67.0% Republican, 9.2% Democratic, and 22.4% with no party affiliation, as of July 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 002 | 814 | 332 | 40.79% |
| 2 | 008 | 1,255 | 467 | 37.21% |
| 3 | 004 | 491 | 159 | 32.38% |
| 4 | 009 | 916 | 261 | 28.49% |
| 5 | 006 | 851 | 235 | 27.61% |
| 6 | 011 | 1,108 | 292 | 26.35% |
| 7 | 001 | 681 | 168 | 24.67% |
| 8 | 010 | 530 | 125 | 23.58% |
| 9 | 007 | 766 | 171 | 22.32% |
| 10 | 005 | 813 | 146 | 17.96% |
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 Jerome County voted for president
Election results are public records.
Jerome County at a glance.
Jerome County had an estimated 26,056 residents in July 2024, the 15th most populous of Idaho's 44 counties, up 7.5% since the 2020 census. Of those, 18,519 are 18 or older, the voting-age population, and 14.1% are 65 or older. Its 9,057 active registered voters equal about 48.9% of that voting-age population.
It covers 598 square miles of land (44 people per square mile), and 43.5% of residents live outside any incorporated city or town. The largest cities and towns are Jerome (13,481), Hazelton (828) and Eden (406). The American Community Survey (2020-2024) puts it at a median age of 34.0, a median household income of $71,724, 14.0% of adults 25 and older holding a bachelor's degree or higher and 75.2% of occupied homes owned by the people living in them.
In 2024, 7,945 votes were cast for president, about 42.9% of the voting-age population; the Democratic ticket took 21.9% and the Republican ticket 75.7%. The two-party margin moved from R+45.3 in 2008 to R+53.8 in 2024.
- Population (2024 estimate)
- 26,056
- Population (2020 census base)
- 24,238
- Voting-age population (18+)
- 18,519
- Active voters per 100 adults
- 48.9
- Residents 65 and older
- 14.1%
- People per square mile
- 44
- Living outside incorporated places
- 43.5%
- Land area
- 598 sq mi
- Median age
- 34.0
- Median household income
- $71,724
- Adults 25+ with a bachelor's degree
- 14.0%
- Owner-occupied homes
- 75.2%
Largest cities and towns
- Jerome 13,481
- Hazelton 828
- Eden 406
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 21.9% | 75.7% | R+53.8 | 7,945 |
| 2020 | 24.2% | 73.4% | R+49.2 | 7,812 |
| 2016 | 19.8% | 68.9% | R+49.1 | 10,667 |
| 2012 | 25.4% | 71.9% | R+46.5 | 6,681 |
| 2008 | 26.2% | 71.5% | R+45.3 | 6,847 |
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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