Johnson County, IA

IA · Presidential Elections 1892–2024

D+37.8
2024 Margin
R+5.4%
2020→2024 Swing
D since 1964
Voting Streak
157K
Population

Johnson County, IA (Iowa) voted D+37.8 for Kamala Harris (Democrat) in the 2024 presidential election, with Harris receiving 58,846 votes (67.92%) to 26,087 (30.11%) for Trump.

This represents a R+5.4% swing toward Republicans compared to 2020. Johnson County is classified as a deep Democratic county. Johnson County has voted Democratic in every presidential election since 1964. The county has a population of approximately 156,639.

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Quick Stats

2024 ResultD+37.8
2020→2024 SwingR+5.4%
Voting StreakD since 1964
Elections on Record34

Demographics

Population156,639
Median Age
31.0(US: 38.7)
College (BA+)
55.2%(US: 35.2%)
Median Income
$74,935(US: $80k)
White (non-Hisp)
75.5%(US: 57.6%)
Hispanic
6.7%(US: 19.1%)
Black
8.4%(US: 12.2%)
Asian
6.2%(US: 5.7%)
Homeownership
59.4%(US: 64.5%)
Poverty Rate
17.1%(US: 12.3%)
Veterans
3.9%(US: 6.2%)
Non-English (CVAP)
9.1%(US: 17.0%)
Source: Census ACS 5-Year (2020-2024)

Community Profile

Religious Composition

Source: Religion Census 2020
Catholic
11.7%(Below Average)
Mainline Protestant
8.0%(Above Average)
Evangelical
6.1%(Below Average)
LDS/Mormon
1.6%
Jewish
0.3%
+ 1 more traditions

Ancestry Groups

Source: Census ACS

Top reported ancestry groups (compared to national average).

German
28.0%Above Average(2.3x)
Irish
14.6%(1.6x)
English
11.8%(1.3x)
Mexican
3.9%
Sub-Saharan African
3.7%Significant Hub(3.1x)
Italian
3.1%
+ 4 more reported ancestry groups

Age Distribution

Median:31.0 yrs(US: 38.5)
Under 18
19.3%↓
18-29
20.8%↑
30-44
21.3%↑
45-64
25.3%
65+
13.3%↓
National average

Employment by Industry

Census ACS
Retail Trade
11.6%
Educational Services
8.9%
Professional & Technical
8.4%(0.7x US)
Manufacturing
7.9%(0.8x US)
Healthcare & Social Services
3.7%(0.8x US)
Construction
3.6%(0.5x US)
National average
+ 1 more sectors

Presidential Elections

Presidential Results

YearDemocratRepublicanMarginSwing
202467.9%(58,846)30.1%(26,087)D+37.8R+5.4
202070.6%(59,177)27.3%(22,925)D+43.2D+5.6
201664.8%(50,200)27.2%(21,044)D+37.6D+2.1
201266.7%(50,666)31.2%(23,698)D+35.5R+6.0
200869.9%(51,027)28.4%(20,732)D+41.5D+12.2
200464.0%(41,847)34.8%(22,715)D+29.3D+4.1
200059.1%(31,174)33.9%(17,899)D+25.2R+6.5
199661.0%(27,888)29.3%(13,402)D+31.7D+3.4
199255.4%(28,656)27.1%(14,041)D+28.2R+1.6
198864.4%(28,759)34.6%(15,453)D+29.8D+13.5

Source: Official state election returns via MIT Election Data + Science Lab

Presidential Margin Trend

Johnson County, IA • 1892–2024

D+R++40+200-20-4018921900190819161924193219401948195619641972198019881996200420122020
Democratic margin
Republican margin

Senate Elections

Senate Results

YearDemocratRepublicanMarginSwing
202270.9%(45,416)28.5%(18,245)D+42.4D+2.1
202069.1%(57,063)28.8%(23,773)D+40.3D+21.9
201657.1%(42,699)38.6%(28,914)D+18.4R+14.7
201465.0%(34,103)31.9%(16,749)D+33.1D+29.8
201050.4%(26,047)47.1%(24,347)D+3.3R+46.7
200874.9%(52,741)24.9%(17,537)D+50.0D+59.1
200443.3%(27,509)52.4%(33,301)R+9.1R+41.9
200264.6%(24,965)31.9%(12,315)D+32.8D+41.0
199845.1%(15,138)53.3%(17,901)R+8.2R+43.6
199666.5%(30,208)31.1%(14,140)D+35.4D+55.3

Source: Official state election returns via MIT Election Data + Science Lab

Governor Elections

Governor Results

YearDemocratRepublicanMarginSwing
202268.6%(43,686)28.9%(18,413)D+39.7R+5.3
201871.6%(48,758)26.6%(18,119)D+45.0D+24.1
201458.7%(30,684)37.9%(19,775)D+20.9R+6.0
201061.6%(31,862)34.7%(17,967)D+26.9R+12.0
200668.3%(30,083)29.4%(12,948)D+38.9D+8.1
200262.9%(24,278)32.0%(12,377)D+30.8R+4.4
199866.9%(22,546)31.6%(10,666)D+35.2D+14.4
199459.4%(20,180)38.5%(13,093)D+20.9D+19.3
199050.0%(16,196)48.5%(15,687)D+1.6R+16.7
198658.9%(15,503)40.6%(10,700)D+18.2R+0.0

Source: Official state election returns via MIT Election Data + Science Lab

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