County record · fips 17031 · Illinois
CookIL
Democratic ×13 since 1976all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
D+42.5
won by Democrats
Record since first cycle
24–16
Dem–Rep two-party wins
Voted with the winner
29/40
73% of its elections
Closest election
1888
R+0.5
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 |
|---|---|---|
| 1876 | +101.7 pts | Democrats |
| 1872 | -81.8 pts | Republicans |
| 1912 | +47.4 pts | Democrats |
| 1920 | -45.7 pts | Republicans |
| 1928 | +44.3 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
5,182,090
College (BA+)
43%
Median income
$83,498
2024 dollars
Non-white
60%
Rural
0%
Age 65+
16%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
DuPage, IL · Kane, IL · Lake, IL · McHenry, IL · Will, IL · Lake, IN