Johnson County, Iowa's estimated 2024 population is 158,141 with a growth rate of 0.39% in the past year according to the most recent United States census data. Johnson County, Iowa is the 4th largest county in Iowa. The 2010 population was 131,344 and has seen a growth of 20.4% since that time.
Year | Population | Growth | Growth Rate |
|---|---|---|---|
| 2029 | 161,206 | 613 | 0.38% |
| 2028 | 160,593 | 613 | 0.38% |
| 2027 | 159,980 | 613 | 0.38% |
| 2026 | 159,367 | 613 | 0.39% |
| 2025 | 158,754 | 613 | 0.39% |
| 2024 | 158,141 | 613 | 0.39% |
| 2023 | 157,528 | 613 | 0.39% |
| 2022 | 156,915 | 1,880 | 1.21% |
| 2021 | 155,035 | 1,979 | 1.29% |
| 2020 | 153,056 | 576 | 0.38% |
| 2019 | 152,480 | 1,477 | 0.98% |
| 2018 | 151,003 | 1,300 | 0.87% |
| 2017 | 149,703 | 2,536 | 1.72% |
| 2016 | 147,167 | 2,053 | 1.41% |
| 2015 | 145,114 | 2,240 | 1.57% |
| 2014 | 142,874 | 2,608 | 1.86% |
| 2013 | 140,266 | 3,086 | 2.25% |
| 2012 | 137,180 | 3,055 | 2.28% |
| 2011 | 134,125 | 2,781 | 2.12% |
| 2010 | 131,344 | 0 | 0% |
| 1990 | 96,119 | 14,402 | 17.62% |
| 1980 | 81,717 | 9,590 | 13.3% |
| 1970 | 72,127 | 18,464 | 34.41% |
| 1960 | 53,663 | 7,907 | 17.28% |
| 1950 | 45,756 | 12,565 | 37.86% |
| 1940 | 33,191 | 2,915 | 9.63% |
| 1930 | 30,276 | 3,814 | 14.41% |
| 1920 | 26,462 | 548 | 2.11% |
| 1910 | 25,914 | 1,097 | 4.42% |
| 1900 | 24,817 | 1,735 | 7.52% |
| 1890 | 23,082 | -2,347 | -9.23% |
| 1880 | 25,429 | 531 | 2.13% |
| 1870 | 24,898 | 7,325 | 41.68% |
| 1860 | 17,573 | 13,101 | 292.96% |
| 1850 | 4,472 | 2,981 | 199.93% |
| 1840 | 1,491 | -159,715 | -99.08% |
White
Black or African American
Asian
Two or more races
Other race
Native American
Native Hawaiian or Pacific Islander
Household Type | Count | Average Size | Owner | Renter |
|---|---|---|---|---|
| All | 61,414 | 2.38 | 59.1 | 40.9 |
| Non Family | 28,660 | 1.56 | 36.1 | 63.9 |
| Married | 26,653 | 3.08 | 84.3 | 15.7 |
| Female | 4,327 | 3.09 | 57.1 | 42.9 |
| Male | 1,774 | 3.11 | 57.6 | 42.4 |
3.02
Average Family Size
2.38
Average Household Size
59.1%
Rate of Home Ownership
Married
Male
Female
NonFamily
owner
renter
Male
Female
Less Than 9th Grade
9th to 12th Grade
High School Graduate
Some College
Associates Degree
Bachelors Degree
Graduate Degree
High School Graduation Rate
Bachelors Rate
The highest rate of high school graduation is among white people with a rate of 97.8%.
The highest rate of bachelors degrees is among asian people with a rate of 68.42%.
All
Male
Female
$52,193
Average Earnings
$58,405
Average Male
$45,810
Average Female
Only English
Spanish
Other Indo-European Languages
Asian and Pacific Island Languages
Other Languages
84.09% of Johnson County, Iowa residents speak only English, while 15.91% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 4.43% of the population.
rate
16.88%
Overall Poverty Rate
15.59%
Male Poverty Rate
18.18%
Female Poverty Rate
The race most likely to be in poverty in Johnson County, Iowa is Islander, with 41.1% below the poverty level.
The race least likely to be in poverty in Johnson County, Iowa is Native, with 13.41% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 2.06%. Among those working part-time, it was 35.32%, and for those that did not work, the poverty rate was 23.87%.
Married
Widowed
Divorced
Separated
NeverMarried
44.1%
Overall Marriage Rate
45.0%
Male Marriage Rate
43.3%
Female Marriage Rate
male
female
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.
Married
Widowed
Divorced
Separated
NeverMarried
Less Than 9th Grade
High School Graduate
Some College
Bachelors or Greater
4.54%
Veteran Poverty Rate
18.64%
Veteran Disability Rate
LaborForceParticipation
69.7%
Labor Force Participation
66.9%
Employment Rate
3.8%
Unemployment Rate
LaborForceParticipation
LaborForceParticipation
Europe
Asia
Africa
Oceania
Latin America
North America
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Europe
Asia
Africa
Oceania
Latin America
North America
56.9%
Born in Johnson County, Iowa
89%
Native Born
11%
Foreign Born
7.18%
Non Citizen
3.82%
Naturalized
89% of Johnson County, Iowa residents were born in the United States, with 56.9% having been born in Iowa. 7.18% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.