County record · fips 17083 · Illinois
JerseyIL
Republican ×7 since 2000all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
R+51.0
won by Republicans
Record since first cycle
22–18
Dem–Rep two-party wins
Voted with the winner
23/40
57% of its elections
Closest election
1988
D+0.4
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 |
|---|---|---|
| 1932 | +37.2 pts | Democrats |
| 1980 | -26.6 pts | Republicans |
| 1976 | +25.7 pts | Democrats |
| 1920 | -25.1 pts | Republicans |
| 2016 | -24.2 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
21,274
College (BA+)
23%
Median income
$80,361
2024 dollars
Non-white
5%
Rural
59%
Age 65+
21%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Calhoun, IL · Greene, IL · Macoupin, IL · Madison, IL · St. Charles, MO