2024 results by precinct
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Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,891 | 13,481 | 15,819 | |
| 2020 | R | 1,661 | 12,099 | 14,173 | |
| 2016 | R | 976 | 8,436 | 11,471 | |
| 2012 | R | 1,303 | 9,895 | 11,381 | |
| 2008 | R | 1,641 | 8,540 | 10,441 | |
| 2004 | R | 1,084 | 7,703 | 8,906 | |
| 2000 | R | 1,100 | 6,480 | 7,836 | |
| 1996 | R | 1,427 | 4,925 | 7,403 | |
| 1992 | R | 978 | 3,471 | 7,116 | |
| 1988 | R | 1,198 | 5,295 | 6,649 | |
| 1984 | R | 743 | 5,770 | 6,563 | |
| 1980 | R | 833 | 5,860 | 6,933 | |
| 1976 | R | 1,745 | 3,599 | 5,525 | |
| 1972 | R | 715 | 2,983 | 5,110 | |
| 1968 | R | 955 | 2,927 | 4,761 | |
| 1964 | R | 2,061 | 2,740 | 4,801 | |
| 1960 | R | 2,374 | 2,625 | 4,999 | |
| 1956 | R | 1,823 | 2,748 | 4,571 | |
| 1952 | R | 1,474 | 2,970 | 4,446 | |
| 1948 | D | 2,017 | 1,490 | 3,568 | |
| 1944 | D | 2,198 | 1,458 | 3,665 | |
| 1940 | D | 2,631 | 1,717 | 4,364 | |
| 1936 | D | 2,776 | 1,037 | 3,864 | |
| 1932 | D | 2,501 | 1,177 | 3,732 | |
| 1928 | R | 1,350 | 1,671 | 3,028 | |
| 1924 | R | 305 | 1,393 | 2,782 | |
| 1920 | R | 741 | 1,794 | 2,535 | |
| 1916 | D | 1,606 | 993 | 2,725 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Demographics
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
American
100.0%
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. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
Age distribution by sex
Median age: 32.8 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.
Median household income
2024 inflation-adjusted dollars
$86,679
Jefferson County ranks in the top 10% of US counties.
Jefferson County$86,679
Idaho$77,800
United States$80,734
Source · American Community Survey 5-year estimates, 2024 release.
Poverty rate
All persons below federal poverty line
9.7%
Children face moderate poverty.
Children under 1818.0%
Working age (18–64)100.0%
Seniors (65+)18.0%
Source · American Community Survey 5-year estimates, 2024 release.
Language at home
Population aged 5 and older
0.0%
speak English only
Source · ACS 5-year estimates, 2024.
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 11.7% of residents not counted as adherents by any reporting body.
Jefferson County's 2024 presidential margin of R+73.2 ranks among the widest in the state, reflecting a predominantly rural, agricultural population with little urban counterweight to the region's strong Republican lean.
The Republican margin in Jefferson County reached its widest at seventy-seven points in 1984. The margin in 2024 was seventy-three points, in line with the county's deep historical pattern.
Jefferson County's loyalty is rooted in its place. Median household income of $86,679, a 88% non-Hispanic-white share, and a population of 33,154 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Cassia County and Sevier County.
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