County record · fips 19121 · Iowa
MadisonIA
Republican ×7 since 2000all 40 elections, 1868–2024
The Long Record
40 elections against the Iowa and national vote
2024 result
R+39.1
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
1984
R+1.6
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 |
|---|---|---|
| 1968 | -39.9 pts | Republicans |
| 1964 | +38.6 pts | Democrats |
| 1932 | +38.1 pts | Democrats |
| 1920 | -35.9 pts | Republicans |
| 1884 | +33.8 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
16,926
College (BA+)
27%
Median income
$90,855
2024 dollars
Non-white
6%
Rural
69%
Age 65+
18%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Adair, IA · Clarke, IA · Dallas, IA · Union, IA · Warren, IA