County record · fips 29183 · Missouri
St. CharlesMO
Republican ×15 since 1968all 40 elections, 1868–2024
The Long Record
40 elections against the Missouri and national vote
2024 result
R+17.2
won by Republicans
Record since first cycle
7–33
Dem–Rep two-party wins
Voted with the winner
26/40
65% of its elections
Closest election
1948
D+0.6
this countyMissourinational (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 |
|---|---|---|
| 1968 | -36.6 pts | Republicans |
| 1932 | +33.8 pts | Democrats |
| 1976 | +31.5 pts | Democrats |
| 1928 | +29.7 pts | Democrats |
| 1972 | -26.7 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
414,535
College (BA+)
43%
Median income
$104,692
2024 dollars
Non-white
17%
Rural
6%
Age 65+
17%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Calhoun, IL · Jersey, IL · Madison, IL · Franklin, MO · Lincoln, MO · St. Louis County, MO · Warren, MO