Voter file loaded July 20, 2026 · figures are from that file, held as a fixed record
Clark County, Idaho has 373 active registered voters — 79.1% Republican, 6.2% Democratic, and 13.4% with no party affiliation, as of July 2026.
Party registration
How Clark County voted for president
Election results are public records.
Clark County at a glance.
Clark County had an estimated 794 residents in July 2024, the least populous of Idaho's 44 counties, up 0.5% since the 2020 census. Of those, 608 are 18 or older, the voting-age population, and 23.4% are 65 or older. Its 373 active registered voters equal about 61.3% of that voting-age population.
It covers 1,763 square miles of land (0.5 people per square mile), and 30.2% of residents live outside any incorporated city or town. The largest cities and towns are Dubois (523) and Spencer (31). The American Community Survey (2020-2024) puts it at a median age of 31.1, a median household income of $55,208, 20.5% of adults 25 and older holding a bachelor's degree or higher and 61.3% of occupied homes owned by the people living in them.
In 2024, 333 votes were cast for president, about 54.8% of the voting-age population; the Democratic ticket took 15.0% and the Republican ticket 84.1%. The two-party margin moved from R+64.2 in 2008 to R+69.1 in 2024.
- Population (2024 estimate)
- 794
- Population (2020 census base)
- 790
- Voting-age population (18+)
- 608
- Active voters per 100 adults
- 61.3
- Residents 65 and older
- 23.4%
- People per square mile
- 0.5
- Living outside incorporated places
- 30.2%
- Land area
- 1,763 sq mi
- Median age
- 31.1
- Median household income
- $55,208
- Adults 25+ with a bachelor's degree
- 20.5%
- Owner-occupied homes
- 61.3%
Largest cities and towns
- Dubois 523
- Spencer 31
Presidential vote, 2008–2024
| Year | Democratic | Republican | Margin | Votes cast |
|---|---|---|---|---|
| 2024 | 15.0% | 84.1% | R+69.1 | 333 |
| 2020 | 13.2% | 84.9% | R+71.7 | 311 |
| 2016 | 15.5% | 71.7% | R+56.2 | 283 |
| 2012 | 20.1% | 71.6% | R+51.5 | 328 |
| 2008 | 17.1% | 81.3% | R+64.2 | 375 |
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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