Jerome County, Idaho: New American county. In 2024, voted R+54%. Republican peak: R+58 in 2004.
Key facts
- 2024 presidential margin
- R+54MIT Election Lab
- Political typology
- New AmericanAkashic typology
- Population
- 25,1732024 5-year
- Median household income
- $71,7242024 5-year
- White (non-Hispanic)
- 65.2%2024 5-year
- Black
- 0.1%2024 5-year
- Hispanic / Latino
- 39.2%2024 5-year
- Peak Democratic margin
- D+29 in 1936MIT Election Lab
- Peak Republican margin
- R+58 in 1984MIT Election Lab
- Most similar
- Twin Falls County, ID · similarity 1.00
2024 results by precinct
2024 precinct map of Jerome CountyPrecinct-level 2024 presidential results for Jerome County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | No data |
| 1896 | No data |
| 1900 | No data |
| 1904 | No data |
| 1908 | No data |
| 1912 | No data |
| 1916 | No data |
| 1920 | −37.8% |
| 1924 | −31.0% |
| 1928 | −45.6% |
| 1932 | +22.5% |
| 1936 | +28.5% |
| 1940 | −14.5% |
| 1944 | −10.7% |
| 1948 | −0.1% |
| 1952 | −48.5% |
| 1956 | −29.4% |
| 1960 | −17.0% |
| 1964 | −26.0% |
| 1968 | −39.3% |
| 1972 | −56.9% |
| 1976 | −26.9% |
| 1980 | −54.2% |
| 1984 | −58.0% |
| 1988 | −31.0% |
| 1992 | −18.3% |
| 1996 | −27.4% |
| 2000 | −50.9% |
| 2004 | −58.3% |
| 2008 | −45.3% |
| 2012 | −46.5% |
| 2016 | −49.1% |
| 2020 | −49.2% |
| 2024 | −53.7% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 1,742 | 6,012 | 7,945 | ||
| R | 1,893 | 5,734 | 7,812 | ||
| R | 1,329 | 4,644 | 6,751 | ||
| R | 1,699 | 4,804 | 6,681 | ||
| R | 1,794 | 4,897 | 6,847 | ||
| R | 1,344 | 5,177 | 6,580 | ||
| R | 1,360 | 4,418 | 6,007 | ||
| R | 1,679 | 3,358 | 6,125 | ||
| R | 1,739 | 2,972 | 6,720 | ||
| R | 1,985 | 3,830 | 5,955 | ||
| R | 1,284 | 4,913 | 6,259 | ||
| R | 1,368 | 4,962 | 6,625 | ||
| R | 1,800 | 3,188 | 5,158 | ||
| R | 888 | 3,661 | 4,874 | ||
| R | 976 | 2,785 | 4,602 | ||
| R | 1,828 | 3,113 | 4,941 | ||
| R | 2,151 | 3,031 | 5,182 | ||
| R | 1,705 | 3,127 | 4,832 | ||
| R | 1,318 | 3,807 | 5,130 | ||
| R | 2,124 | 2,128 | 4,305 | ||
| R | 1,741 | 2,157 | 3,898 | ||
| R | 1,881 | 2,520 | 4,408 | ||
| D | 2,374 | 1,297 | 3,778 | ||
| D | 2,219 | 1,393 | 3,679 | ||
| R | 759 | 2,050 | 2,831 | ||
| R | 376 | 1,117 | 2,389 | ||
| R | 784 | 1,738 | 2,522 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
English
13.2%
German
10.7%
American
6.8%
Irish
6.3%
Scottish
2.5%
Italian
0.9%
Polish
0.8%
Sample size too small to break out by ancestry reliably.
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 34.0 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$71,724
Jerome County ranks near the middle of US counties.
Jerome County$71,724
Idaho$77,800
United States$80,734
Jerome County ranks near the middle of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
12.6%
Child poverty is below the national average.
Children under 1814.3%
Working age (18–64)12.1%
Seniors (65+)8.9%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
65.3%
speak English only
Spanish33.7%
Other Indo-European0.5%
Asian & Pacific Islander0.3%
Other languages0.2%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 68.5% of residents not counted as adherents by any reporting body.
Jerome County sits in the Snake River Plain's intensive agricultural corridor, where a substantial Latino workforce tied to the dairy and food-processing industries creates a demographic tension with its lopsided Republican presidential margins.
Jerome County has leaned Republican in recent presidential elections, reaching a Democratic margin of twenty-nine points in 1936. Between 2020 and 2024 it moved five points toward the Republican candidate — part of the sharpest rightward shift recorded among any group of places in the country.
Its demographics describe the shift: a 65% non-Hispanic-white share, a median household income of $71,724, and a population of 25,173. The county's voting pattern over the last decade is most similar to that of Twin Falls County and Klamath County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Jerome County, Idaho. Akashic. https://akashic.app/county/16053/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
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Frequently asked questions
How did Jerome County, Idaho vote in 2024?
In 2024, Jerome County, Idaho voted Republican by 53.7 points (R+54), carried by the Republican candidate. Out of 7,945 votes cast, 1,742 went Democratic and 6,012 went Republican.
What is Jerome County, Idaho's political typology?
Akashic places Jerome County, Idaho in the "New American" typology — Communities where a large share of households speak a language other than English — multilingual, Democratic-leaning overall, yet the hardest-swinging bloc toward the Republican Party in 2024. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 2 times, Republican 25 times, and other 0 times.
When did Jerome County, Idaho last vote Democratic?
The most recent presidential election in which Jerome County, Idaho voted Democratic was 1936.
How many people live in Jerome County, Idaho?
Jerome County, Idaho has a population of 25,173 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Jerome County, Idaho?
Median household income in Jerome County, Idaho is $71,724 — below the national median of $80,734. The Idaho state median is $77,800.
What is the political history of Jerome County, Idaho?
Akashic tracks 38 presidential elections in Jerome County, Idaho from 1876 to 2024. Of those, 2 went Democratic and 25 went Republican. The county's typology — "New American" — captures where that record, its demographics, and its recent swing place it among American communities.