County record · fips 29129 · Missouri
MercerMO
Republican ×7 since 2000all 40 elections, 1868–2024
The Long Record
40 elections against the Missouri and national vote
2024 result
R+73.6
won by Republicans
Record since first cycle
6–34
Dem–Rep two-party wins
Voted with the winner
27/40
68% of its elections
Closest election
1988
D+0.1
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 | +56.9 pts | Democrats |
| 1976 | +51.7 pts | Democrats |
| 1964 | +45.0 pts | Democrats |
| 2000 | -41.4 pts | Republicans |
| 1968 | -39.0 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
3,482
College (BA+)
18%
Median income
$62,679
2024 dollars
Non-white
9%
Rural
100%
Age 65+
22%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Decatur, IA · Wayne, IA · Grundy, MO · Harrison, MO · Putnam, MO · Sullivan, MO