County record · fips 17199 · Illinois
WilliamsonIL
Republican ×7 since 2000all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
R+39.3
won by Republicans
Record since first cycle
10–30
Dem–Rep two-party wins
Voted with the winner
29/40
73% of its elections
Closest election
1940
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 | +36.5 pts | Democrats |
| 1876 | -34.5 pts | Republicans |
| 1968 | -33.4 pts | Republicans |
| 1976 | +32.9 pts | Democrats |
| 1964 | +32.7 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
66,876
College (BA+)
26%
Median income
$65,604
2024 dollars
Non-white
12%
Rural
41%
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 · Jackson, IL · Johnson, IL · Saline, IL · Union, IL