County record · fips 16051 · Idaho
JeffersonID
Republican ×19 since 1952reported 1916–2024 · 28 elections
The Long Record
28 elections against the Idaho and national vote
2024 result
R+75.4
won by Republicans
Record since first cycle
6–22
Dem–Rep two-party wins
Voted with the winner
20/28
71% of its elections
Closest election
1960
R+5.0
this countyIdahonational (official)dot colour = two-party winner · hollow = tie or unknown total · click a dot to open that election
The Biggest Swings
Cycle-over-cycle change in the two-party margin, in points
| Election | Swing | Toward |
|---|---|---|
| 1920 | -65.1 pts | Republicans |
| 1928 | +54.2 pts | Democrats |
| 1952 | -48.7 pts | Republicans |
| 1932 | +46.7 pts | Democrats |
| 1980 | -40.4 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
33,154
College (BA+)
27%
Median income
$86,679
2024 dollars
Non-white
14%
Rural
67%
Age 65+
12%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Bingham, ID · Bonneville, ID · Butte, ID · Clark, ID · Fremont, ID · Madison, ID