Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Bonneville County, Idaho has 64,012 active registered voters — 65.7% Republican, 8.3% Democratic, and 24.6% with no party affiliation, as of July 2026.
Party registration
Most reliable-voting precincts
| # | Precinct | Active voters | Supervoters | Supervoter % |
|---|---|---|---|---|
| 1 | 25 | 1,552 | 634 | 40.85% |
| 2 | 16 | 1,174 | 479 | 40.8% |
| 3 | 15 | 1,209 | 482 | 39.87% |
| 4 | 38 | 954 | 374 | 39.2% |
| 5 | 24 | 1,090 | 414 | 37.98% |
| 6 | 26 | 1,463 | 531 | 36.3% |
| 7 | 21 | 1,893 | 687 | 36.29% |
| 8 | 19 | 1,028 | 370 | 35.99% |
| 9 | 37 | 781 | 280 | 35.85% |
| 10 | 01 | 1,484 | 510 | 34.37% |
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 Bonneville County voted for president
Election results are public records.
Bonneville County at a glance.
Bonneville County had an estimated 133,644 residents in July 2024, the fourth most populous of Idaho's 44 counties, up 7.8% since the 2020 census. Of those, 95,256 are 18 or older, the voting-age population, and 14.4% are 65 or older. Its 64,012 active registered voters equal about 67.2% of that voting-age population.
It covers 1,866 square miles of land (72 people per square mile), and 29.2% of residents live outside any incorporated city or town. The largest cities and towns are Idaho Falls (69,523), Ammon (20,095), Iona (3,113), Ucon (1,218) and Swan Valley (310). The American Community Survey (2020-2024) puts it at a median age of 33.6, a median household income of $79,068, 33.1% of adults 25 and older holding a bachelor's degree or higher and 71.7% of occupied homes owned by the people living in them.
In 2024, 56,419 votes were cast for president, about 59.2% of the voting-age population; the Democratic ticket took 25.6% and the Republican ticket 71.0%. The two-party margin moved from R+42.9 in 2008 to R+45.4 in 2024.
- Population (2024 estimate)
- 133,644
- Population (2020 census base)
- 123,957
- Voting-age population (18+)
- 95,256
- Active voters per 100 adults
- 67.2
- Residents 65 and older
- 14.4%
- People per square mile
- 72
- Living outside incorporated places
- 29.2%
- Land area
- 1,866 sq mi
- Median age
- 33.6
- Median household income
- $79,068
- Adults 25+ with a bachelor's degree
- 33.1%
- Owner-occupied homes
- 71.7%
Largest cities and towns
- Idaho Falls 69,523
- Ammon 20,095
- Iona 3,113
- Ucon 1,218
- Swan Valley 310
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 25.6% | 71.0% | R+45.4 | 56,419 |
| 2020 | 26.4% | 70.0% | R+43.6 | 53,995 |
| 2016 | 20.2% | 60.4% | R+40.2 | 44,212 |
| 2012 | 22.9% | 74.7% | R+51.8 | 43,302 |
| 2008 | 27.4% | 70.3% | R+42.9 | 41,703 |
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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