County record · fips 29189 · Missouri
St. Louis CountyMO
Democratic ×9 since 1992all 40 elections, 1868–2024
The source double-counts this county's total vote in 28 elections (1888–1996), so third-party votes and turnout are unknown for those years. Two-party figures are unaffected.
The Long Record
40 elections against the Missouri and national vote
2024 result
D+23.8
won by Democrats
Record since first cycle
15–25
Dem–Rep two-party wins
Voted with the winner
26/40
65% of its elections
Closest election
1960
D+2.6
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 |
|---|---|---|
| 1932 | +35.9 pts | Democrats |
| 1912 | +31.9 pts | Democrats |
| 1940 | -28.4 pts | Republicans |
| 1968 | -26.8 pts | Republicans |
| 1992 | +20.8 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
995,569
College (BA+)
47%
Median income
$82,936
2024 dollars
Non-white
39%
Rural
1%
Age 65+
19%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Madison, IL · Monroe, IL · St. Clair, IL · Franklin, MO · Jefferson, MO · St. Charles, MO · St. Louis City, MO