County record · fips 17135 · Illinois
MontgomeryIL
Republican ×4 since 2012all 40 elections, 1868–2024
The Long Record
40 elections against the Illinois and national vote
2024 result
R+44.8
won by Republicans
Record since first cycle
21–19
Dem–Rep two-party wins
Voted with the winner
24/40
60% of its elections
Closest election
1968
R+1.5
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 |
|---|---|---|
| 1932 | +37.3 pts | Democrats |
| 1980 | -28.0 pts | Republicans |
| 2016 | -27.7 pts | Republicans |
| 1920 | -27.5 pts | Republicans |
| 1964 | +26.5 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
27,942
College (BA+)
18%
Median income
$63,620
2024 dollars
Non-white
8%
Rural
53%
Age 65+
22%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Bond, IL · Christian, IL · Fayette, IL · Macoupin, IL · Madison, IL · Sangamon, IL · Shelby, IL