County record · fips 39109 · Ohio
MiamiOH
Republican ×15 since 1968all 40 elections, 1868–2024
The Long Record
40 elections against the Ohio and national vote
2024 result
R+45.5
won by Republicans
Record since first cycle
3–37
Dem–Rep two-party wins
Voted with the winner
26/40
65% of its elections
Closest election
1916
R+1.7
this countyOhionational (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 |
|---|---|---|
| 1964 | +50.4 pts | Democrats |
| 1932 | +40.0 pts | Democrats |
| 1968 | -32.2 pts | Republicans |
| 1972 | -27.4 pts | Republicans |
| 1984 | -24.7 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
110,296
College (BA+)
27%
Median income
$76,817
2024 dollars
Non-white
10%
Rural
31%
Age 65+
19%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Champaign, OH · Clark, OH · Darke, OH · Montgomery, OH · Shelby, OH