County record · fips 29099 · Missouri
JeffersonMO
Republican ×4 since 2012all 40 elections, 1868–2024
The Long Record
40 elections against the Missouri and national vote
2024 result
R+37.2
won by Republicans
Record since first cycle
24–16
Dem–Rep two-party wins
Voted with the winner
27/40
68% of its elections
Closest election
1900
D+0.4
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 |
|---|---|---|
| 1976 | +38.7 pts | Democrats |
| 1932 | +37.3 pts | Democrats |
| 1968 | -35.0 pts | Republicans |
| 1972 | -28.9 pts | Republicans |
| 1964 | +27.3 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
229,458
College (BA+)
25%
Median income
$82,851
2024 dollars
Non-white
12%
Rural
35%
Age 65+
17%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Monroe, IL · Franklin, MO · Ste. Genevieve, MO · St. Francois, MO · St. Louis County, MO · Washington, MO