Demographics of Johnston city, Iowa

Johnston city, Iowa had 25,065 people on July 1, 2025, by the Census Bureau’s estimate: +1,081 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Johnston city, in four figures

25,065
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 24,384 ±37.; +4.5%
Change since July 2020: +1,081 people.; 37.4 ±2.1
Median age: ACS 2020–⁠2024.; $106,551 ±$10,761
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a place, so the change is the difference between one July estimate and the next.

Johnston city, Iowa's population grew 4.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Johnston city, Iowa's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Johnston city, Iowa's population grew 4.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Johnston city, Iowa's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	23,984	100.0	100.0
2021	24,086	100.4	100.2
2022	24,178	100.8	100.7
2023	24,534	102.3	101.6
2024	24,938	104.0	102.5
2025	25,065	104.5	103.1

Population of Johnston city, Iowa on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	23,984	—
2021	24,086	+102
2022	24,178	+92
2023	24,534	+356
2024	24,938	+404
2025	25,065	+127

Age, 2020–2024

The median age is 37.4 ±2.1: for men 37.5 ±2.3 and for women 37.3 ±2.7. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Johnston city by age, ACS 2020–2024
Age	People	Share	Iowa	United States
Under 5	1,392 ±335	5.7% ±1.4	5.9% ±<0.1	5.6% ±<0.1
5 to 17	6,035 ±707	24.7% ±2.9	17.0% ±0.1	16.3% ±<0.1
18 to 24	1,526 ±303	6.3% ±1.2	10.0% ±0.1	9.1% ±<0.1
25 to 44	5,802 ±665	23.8% ±2.7	25.1% ±0.1	26.9% ±<0.1
45 to 64	5,888 ±527	24.1% ±2.2	23.9% ±0.1	24.8% ±<0.1
65 and over	3,741 ±582	15.3% ±2.4	18.1% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $106,551 ±$10,761, and income per person $57,529 ±$5,116, in 2024 dollars. The median is $75,059 ±$418 in Iowa and $80,734 ±$166 in the United States.

Households by income

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Households in Johnston city by income, ACS 2020–2024
Household income	Households	Share	Iowa	United States
Under $25,000	667 ±213	7.2% ±2.3	13.9% ±0.2	14.6% ±<0.1
$25,000 to $49,999	1,230 ±402	13.3% ±4.3	18.5% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,318 ±343	14.2% ±3.6	17.5% ±0.3	15.5% ±<0.1
$75,000 to $99,999	1,052 ±213	11.4% ±2.2	14.0% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,535 ±294	16.6% ±3.0	18.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	1,131 ±263	12.2% ±2.7	8.8% ±0.2	9.6% ±<0.1
$200,000 or more	2,326 ±284	25.1% ±2.6	8.6% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Johnston city by age, ACS 2020–2024
Age	Below poverty	Rate	Iowa	United States
All ages	1,146 to 3,750	4.8% to 15.6%	11.1% ±0.2	12.5% ±0.1
Under 18	1,326 ±642	18.0% ±8.4	12.9% ±0.3	16.1% ±0.1
18 to 59	905 ±364	7.4% ±2.9	11.4% ±0.3	11.6% ±0.1
60 and over	217 ±89	4.8% ±1.8	8.8% ±0.2	11.0% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Housing, 2020–2024

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Housing in Johnston city, ACS 2020–2024
Measure	Johnston city	Iowa	United States
Housing units	9,720 ±591	1,437,699 ±523	143,775,355 ±10,234
Occupied	95.3% ±2.1	91.5% ±0.3	89.9% ±0.1
Vacant	4.7% ±2.1	8.5% ±0.3	10.1% ±0.1
Owner occupied	70.8% ±1.9	71.7% ±0.3	65.2% ±0.3
Renter occupied	29.2% ±3.8	28.3% ±0.3	34.8% ±0.1
Median home value	$369,100 ±$16,483	$208,000 ±$1,141	$332,700 ±$236
Median gross rent	$1,338 ±$72	$972 ±$6	$1,413 ±$2
Median year built	2004 ±1	1972 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Johnston city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Iowa	United States
Hispanic or Latino	648 ±237	2.7% ±1.0	7.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	18,505 ±1,257	75.9% ±5.2	82.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	2,590 ±1,245	10.6% ±5.1	3.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	1,772 ±615	7.3% ±2.5	2.5% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 37	0% to 0.2%	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 19	0% to 0.1%	0.2% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 58	0% to 0.2%	0.3% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	825 ±335	3.4% ±1.4	3.5% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Johnston city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Iowa	United States
Born in the state	15,500 ±1,024	63.6% ±4.2	69.6% ±0.2	57.3% ±<0.1
Born in another state	6,378 ±961	26.2% ±3.9	23.8% ±0.2	26.9% ±<0.1
Born a citizen outside the states	49 to 329	0.2% to 1.3%	0.7% ±<0.1	1.7% ±<0.1
Born abroad	2,317 ±547	9.5% ±2.2	5.9% ±0.1	14.1% ±<0.1
Naturalized citizens	1,265 ±380	5.2% ±1.6	2.6% ±0.1	7.4% ±<0.1
Not citizens	1,052 ±387	4.3% ±1.6	3.3% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Johnston city among the places of Iowa

21st of 86 places of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Iowa page.

Places of Iowa near Johnston city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Waukee city	29,236 ±34
Marshalltown city	27,626 ±28
Mason City city	27,050 ±27
Ottumwa city	25,430 ±29
Fort Dodge city	24,827 ±47
Johnston city	24,384 ±37
Clinton city	24,322 ±18
Burlington city	23,728 ±24
Muscatine city	23,489 ±27
Coralville city	23,234 ±34
Altoona city	21,495 ±44

Rankings this appears in

No. 1 Places in Iowa by median rent
No. 1 Places in Iowa by per capita income
No. 2 Places in Iowa by median home value
No. 4 Places in Iowa by median household income
No. 10 Places in Iowa by foreign-born share
No. 13 Places in Iowa by homeownership rate

Sources

Census Bureau population estimates — incorporated places and New England towns — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026