4th most populous of 99
With 160,080 residents in 2024, Johnson County ranks 4th by population among Iowa's 99 counties and is home to 4.9% of the state's residents.
Johnson County is home to 160,080 people (2024 estimate) on 613 square miles of land. This page brings together official U.S. Census Bureau population estimates since 2000, the components of change—births, deaths and migration—American Community Survey indicators on income, housing, poverty and education, BEA economic accounts and BLS unemployment.
Key indicators
Population
160,080
July 1, 2024 estimate
2020 Census base
152,854
April 1, 2020
Change since 2020
+4.7%
2020–2024
Land area
613 mi²
1,588 km²
Population density
261.1 /mi²
2024 estimate ÷ land area
Births
1,690
Year to July 1, 2024
Deaths
901
Year to July 1, 2024
Natural change
+789
Births minus deaths, 2024
Net migration
+1,080
Domestic + international, 2024
Per capita personal income
$66,028
BEA, 2024
Gross domestic product
$12.6 billion
BEA, current dollars, 2024
Median household income
$74,935
ACS 2020–2024 5-year
Poverty rate
17.1%
ACS 2020–2024 5-year
Bachelor’s degree or higher
55.2%
Age 25+, ACS 2020–2024 5-year
Foreign-born residents
9.8%
ACS 2020–2024 5-year
Median home value
$308,600
ACS 2020–2024 5-year
Unemployment rate
2.4%
BLS annual average, 2024
Historical data
Pick an indicator to see its long-run evolution.
Population
2000–2024160,080▲ 44%
U.S. Census Bureau: intercensal estimates 2000–2009, Vintage 2020 (2010–2019) and Vintage 2024 (2020–2024), July 1.
Data summary
| Indicator | Value | Year and source |
|---|---|---|
| Population estimate | 160,080 | 2024 · U.S. Census Bureau |
| Population, 2010 Census | 130,882 | 2010 · U.S. Census Bureau |
| Population, 2000 | 111,455 | July 1, 2000 · Census intercensal |
| Change since 2000 | +43.6% | 2000–2024 · Census |
| International migration | +1,759 | 2024 · Census Vintage 2024 |
| Domestic migration | −679 | 2024 · Census Vintage 2024 |
| Birth rate | 10.6 per 1,000 | 2024 · calculated |
| Death rate | 5.6 per 1,000 | 2024 · calculated |
| Population rank in Iowa | 4th of 99 | 2024 · calculated |
| Per capita personal income | $66,028 | BEA, 2024 · official |
| Gross domestic product | $12.6 billion | BEA, current dollars, 2024 · official |
| Median household income | $74,935 | ACS 2020–2024 5-year · official |
| Poverty rate | 17.1% | ACS 2020–2024 5-year · official |
| Bachelor’s degree or higher | 55.2% | Age 25+, ACS 2020–2024 5-year · official |
| Foreign-born residents | 9.8% | ACS 2020–2024 5-year · official |
| Median home value | $308,600 | ACS 2020–2024 5-year · official |
| Median gross rent | $1,122/month | ACS 2020–2024 5-year · official |
| Median age | 31.0 years | ACS 2020–2024 5-year · official |
| Households | 63,341 | ACS 2020–2024 5-year · official |
| Owner-occupied homes | 59.4% | ACS 2020–2024 5-year · official |
Johnson County in context
Comparable indicators for Johnson County, Iowa and the United States.
| Indicator | County | Iowa | U.S. | Reference |
|---|---|---|---|---|
| Population change 2020–2024 | +4.7% | +1.6% | +2.6% | Census Vintage 2024 |
| Birth rate (per 1,000) | 10.6 | 11.2 | 10.6 | 2024 |
| Death rate (per 1,000) | 5.6 | 10.0 | 9.1 | 2024 |
| Net migration rate (per 1,000) | 6.7 | 5.9 | 8.2 | 2024 |
| Population density (/mi²) | 261.1 | 58.0 | 96.3 | 2024 |
| Per capita personal income | $66,028 | $65,225 | $73,204 | BEA, 2024 |
| Median household income | $74,935 | $75,059 | $80,734 | ACS 2020–2024 5-year |
| Poverty rate | 17.1% | 11.1% | 12.5% | ACS 2020–2024 5-year |
| Bachelor’s degree or higher | 55.2% | 31.4% | 35.7% | Age 25+, ACS 2020–2024 5-year |
| Foreign-born residents | 9.8% | 5.9% | 14.1% | ACS 2020–2024 5-year |
| Median home value | $308,600 | $208,000 | $332,700 | ACS 2020–2024 5-year |
| Median gross rent | $1,122/month | $972/month | $1,413/month | ACS 2020–2024 5-year |
| Median age | 31.0 years | 38.6 years | 38.9 years | ACS 2020–2024 5-year |
| Owner-occupied homes | 59.4% | 71.7% | 65.2% | ACS 2020–2024 5-year |
Cities & towns
2 cities · choose how to order them
Iowa City
76,710 residents
Coralville
23,000 residents
Did you know? Johnson County
A quarter century of change
Its population went from 111,455 in 2000 to 160,080 in 2024, a change of +43.6%, compared with +10.7% for Iowa as a whole.
Births and deaths
In the year to July 2024 the county recorded 1,690 births and 901 deaths, so births outnumbered deaths by 789.
Record population
Annual Census estimates since 2000 put the county's highest population in 2024, at 160,080.
4th in density
Johnson County has about 261.1 residents per square mile of land, ranking 4th of 99 counties; Iowa averages 58.0.
Household income rank
With a median household income of $74,935 (ACS 2020–2024 5-year), the county ranks 29th of 99 Iowa counties; the state median is $75,059.
Size of the economy
Its economy produced $12.6 billion of GDP in 2024 (BEA), 4th largest among 99 Iowa counties.
Latest economic growth
Real GDP grew 1.7% in 2024, adjusted for inflation (BEA, chained 2017 dollars).
Sources and methodology
- U.S. Census Bureau — County population totals and components, Vintage 2024
- U.S. Census Bureau — County estimates 2010–2020
- U.S. Census Bureau — Intercensal estimates 2000–2010
- U.S. Census Bureau — Gazetteer files (land area)
- U.S. Census Bureau — American Community Survey 2020–2024 5-year
- U.S. Bureau of Economic Analysis — Regional economic accounts
- U.S. Bureau of Labor Statistics — LAUS