County record · fips 19103 · Iowa
JohnsonIA
Democratic ×16 since 1964all 40 elections, 1868–2024
The Long Record
40 elections against the Iowa and national vote
2024 result
D+38.6
won by Democrats
Record since first cycle
32–8
Dem–Rep two-party wins
Voted with the winner
23/40
57% of its elections
Closest election
1928
R+0.7
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 |
|---|---|---|
| 1964 | +38.1 pts | Democrats |
| 1968 | -27.8 pts | Republicans |
| 1952 | -25.7 pts | Republicans |
| 1912 | +24.7 pts | Democrats |
| 1932 | +23.8 pts | Democrats |
Who Lives Here
Census & ACS county profile, 2024
Population
156,639
College (BA+)
55%
Median income
$74,935
2024 dollars
Non-white
25%
Rural
17%
Age 65+
13%
Interpolated between Census/ACS anchors; income CPI-deflated to 2024. Demographics begin in 2000 — earlier cycles have returns only.
Neighbouring counties
Cedar, IA · Iowa, IA · Linn, IA · Louisa, IA · Muscatine, IA · Washington, IA