County record · fips 17063 · Illinois
GrundyIL
Republican ×4 since 2012all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
R+30.0
won by Republicans
Record since first cycle
3–37
Dem–Rep two-party wins
Voted with the winner
26/40
65% of its elections
Closest election
2008
D+1.7
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 |
|---|---|---|
| 1876 | +70.5 pts | Democrats |
| 1872 | -63.7 pts | Republicans |
| 1928 | +47.3 pts | Democrats |
| 1920 | -34.1 pts | Republicans |
| 1912 | +31.3 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
53,219
College (BA+)
24%
Median income
$92,235
2024 dollars
Non-white
18%
Rural
25%
Age 65+
15%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Kankakee, IL · Kendall, IL · LaSalle, IL · Livingston, IL · Will, IL