Jefferson County, Idaho
Precinct data
Results by precinct
21 precincts · 15,820 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -004004 | 165 | 980 | 33 | 1,178 | 14.0% | 83.2% | R+69.2 |
|---|---|---|---|---|---|---|---|
| Precinct -021021 | 146 | 923 | 41 | 1,110 | 13.2% | 83.2% | R+70.0 |
| Precinct -005005 | 105 | 933 | 28 | 1,066 | 9.8% | 87.5% | R+77.7 |
| Precinct -020020 | 82 | 934 | 31 | 1,047 | 7.8% | 89.2% | R+81.4 |
| Precinct -019019 | 115 | 871 | 36 | 1,022 | 11.3% | 85.2% | R+74.0 |
| Precinct -006006 | 123 | 834 | 32 | 989 | 12.4% | 84.3% | R+71.9 |
| Precinct -007007 | 127 | 803 | 23 | 953 | 13.3% | 84.3% | R+70.9 |
| Precinct -001001 | 134 | 731 | 39 | 904 | 14.8% | 80.9% | R+66.0 |
| Precinct -016016 | 103 | 726 | 21 | 850 | 12.1% | 85.4% | R+73.3 |
| Precinct -003003 | 96 | 673 | 24 | 793 | 12.1% | 84.9% | R+72.8 |
| Precinct -013013 | 96 | 664 | 25 | 785 | 12.2% | 84.6% | R+72.4 |
| Precinct -017017 | 93 | 682 | 10 | 785 | 11.8% | 86.9% | R+75.0 |
| Precinct -018018 | 74 | 673 | 21 | 768 | 9.6% | 87.6% | R+78.0 |
| Precinct -008008 | 79 | 630 | 21 | 730 | 10.8% | 86.3% | R+75.5 |
| Precinct -012012 | 117 | 510 | 16 | 643 | 18.2% | 79.3% | R+61.1 |
| Precinct -002002 | 85 | 417 | 12 | 514 | 16.5% | 81.1% | R+64.6 |
| Precinct -011011 | 41 | 410 | 6 | 457 | 9.0% | 89.7% | R+80.7 |
| Precinct -015015 | 46 | 351 | 19 | 416 | 11.1% | 84.4% | R+73.3 |
| Precinct -014014 | 33 | 282 | 4 | 319 | 10.3% | 88.4% | R+78.1 |
| Precinct -010010 | 16 | 244 | 5 | 265 | 6.0% | 92.1% | R+86.0 |
| Precinct -009009 | 15 | 210 | 1 | 226 | 6.6% | 92.9% | R+86.3 |
Presidential margin, 1916–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1916 | +22.5% |
| 1920 | −41.5% |
| 1924 | −39.1% |
| 1928 | −10.6% |
| 1932 | +35.5% |
| 1936 | +45.0% |
| 1940 | +20.9% |
| 1944 | +20.2% |
| 1948 | +14.8% |
| 1952 | −33.6% |
| 1956 | −20.2% |
| 1960 | −5.0% |
| 1964 | −14.1% |
| 1968 | −41.4% |
| 1972 | −44.4% |
| 1976 | −33.6% |
| 1980 | −72.5% |
| 1984 | −76.6% |
| 1988 | −61.6% |
| 1992 | −35.0% |
| 1996 | −47.3% |
| 2000 | −68.7% |
| 2004 | −74.3% |
| 2008 | −66.1% |
| 2012 | −75.5% |
| 2016 | −65.0% |
| 2020 | −73.6% |
| 2024 | −73.3% |
U.S. Senate
| Year | Won | Democratic | Republican | Total |
|---|---|---|---|---|
| 2022 | R | 9.2%1,672 | 81.3%14,792 | 18,188 |
| 2020 | R | 11.7%1,647 | 83.2%11,702 | 14,066 |
Registered voters
By party of registration, over time
Registration and the presidential vote track closely here — within 1.5 points.
| Year | Total registered | Democratic | Republican | Unaffiliated | Other |
|---|---|---|---|---|---|
| 2018 | 13,479 | 425 | 10,019 | 2,942 | 93 |
| 2020 | 15,567 | 573 | 11,728 | 3,117 | 149 |
| 2022 | 15,643 | 519 | 12,228 | 2,728 | 168 |
| 2024 | 17,082 | 580 | 13,354 | 2,946 | 202 |
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
+224 net domestic migration · 2025
Net +3,611 over 2011–2025 · gain loss
Arrivals reported $71,145 in average income, against $82,566 for residents who stayed — 14% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+47.3 on average — 26 points more Democratic-leaning than Jefferson County, ID itself (R+73.3).
Where arrivals came from lean of each source
- Bonneville County, ID329R+45.4
- Madison County, ID155R+64.3
- Bingham County, ID35R+59.6
- Utah County, UT28R+39.8
- Salt Lake County, UT25D+10.2
- Fremont County, ID22R+69.0
Where departures went households, 2022–23
- Bonneville County, ID339
- Madison County, ID136
- Bingham County, ID36
- Utah County, UT34
- Bannock County, ID24
- Ada County, ID23
Migration is one input to a place’s political change, not its cause — a shift can also come from residents changing their minds, generational turnover, or turnout. These figures describe the places people moved between; they do not measure how any mover voted.
| Year | Net domestic migration |
|---|---|
| 2011 | −265 |
| 2012 | −42 |
| 2013 | −184 |
| 2014 | −199 |
| 2015 | −121 |
| 2016 | +393 |
| 2017 | +314 |
| 2018 | +630 |
| 2019 | +135 |
| 2021 | +958 |
| 2022 | +887 |
| 2023 | +603 |
| 2024 | +278 |
| 2025 | +224 |
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.
Across the recorded series it reached a Democratic high of 45.0 points in 1936 and a Republican high of 76.6 points in 1984. The 2024 margin was 73.3 points.
A population of 33,154, a 86% non-Hispanic-white share, and a median household income of $86,679 describe the county. The county's voting pattern over the last decade is most similar to that of Franklin County and Millard County.
The counties whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
Browse places by community — income, education, race & ethnicity, language — all community cuts →
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 →
Jefferson County, Idaho. Akashic. https://akashic.app/county/16051/. Accessed May 20, 2026. License: CC BY 4.0.