County record · fips 17081 · Illinois
JeffersonIL
Republican ×7 since 2000all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
R+48.4
won by Republicans
Record since first cycle
22–18
Dem–Rep two-party wins
Voted with the winner
27/40
68% of its elections
Closest election
1988
D+0.7
this countyIllinoisnational (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 |
|---|---|---|
| 1872 | -121.8 pts | Republicans |
| 1876 | +105.7 pts | Democrats |
| 1932 | +38.8 pts | Democrats |
| 1964 | +33.1 pts | Democrats |
| 1976 | +28.8 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
36,550
College (BA+)
18%
Median income
$63,118
2024 dollars
Non-white
16%
Rural
59%
Age 65+
20%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Franklin, IL · Hamilton, IL · Marion, IL · Perry, IL · Washington, IL · Wayne, IL