County record · fips 19141 · Iowa
O'BrienIA
Republican ×22 since 1940all 40 elections, 1868–2024
The Long Record
40 elections against the Iowa and national vote
2024 result
R+61.5
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
1964
R+0.5
this countyIowanational (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 |
|---|---|---|
| 1912 | +59.8 pts | Democrats |
| 1932 | +50.5 pts | Democrats |
| 1920 | -49.4 pts | Republicans |
| 1952 | -49.1 pts | Republicans |
| 1916 | -47.8 pts | Republicans |
Who Lives Here
Census & ACS county profile, 2024
Population
14,126
College (BA+)
22%
Median income
$68,356
2024 dollars
Non-white
13%
Rural
64%
Age 65+
21%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.