Johnston, Iowa demographics

Johnston, IA demographics: median age 37.4; 57.8% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Johnston city, Iowa · Incorporated city · GEOID 1939765. The survey estimates a population of 24,384 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Johnston is 37.4 years, with a 90% margin of error of 2.1 years. There are 9,259 households (±599). Age and household distributions show how these totals are composed; they do not establish which neighborhood suits a particular person.

Every count and share is an estimate. “±” is a 90% margin of error (MOE); pp means percentage points. Derived shares use the category count divided by the named universe. Aggregated category MOEs and percentage MOEs are approximate. A margin larger than half its estimate is flagged as low precision. Blank source uncertainty is shown as unavailable, never zero.

Age distribution and sex

City, state and U.S. estimates · ACS 2020–2024
Measure / survey universe	City estimate ± MOE	State estimate ± MOE	U.S. estimate ± MOE
Median age Total population · years	37.4 ±2.1	38.6 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 24,384
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Under 18	7,427 ±783	30.5% ±3.2 pp	22.9%	22.0%
18–34	3,939 ±529	16.2% ±2.2 pp	22.5%	22.8%
35–64	9,277 ±729	38.0% ±3.0 pp	36.5%	38.0%
65 and older	3,741 ±582	15.3% ±2.4 pp	18.1%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 24,384
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Male	11,804 ±489	48.4% ±2.0 pp	50.2%	49.5%
Female	12,580 ±494	51.6% ±2.0 pp	49.8%	50.5%

The age groups are mutually exclusive and cover the entire population. The sex categories follow this ACS table’s published classification; they are not a survey of gender identity.

Race and Hispanic origin

Race · B02001 · ACS 2020–2024 Total population: 24,384
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
White alone	18,682 ±1,261	76.6% ±5.2 pp	84.1%	61.0%
Black or African American alone	2,590 ±1,245	10.6% ±5.1 pp	3.9%	12.2%
American Indian and Alaska Native alone	39 ±37 · low precision	0.2% ±0.2 pp · low precision	0.4%	0.9%
Asian alone	1,772 ±615	7.3% ±2.5 pp	2.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.2%	0.2%
Some other race alone	269 ±182 · low precision	1.1% ±0.7 pp · low precision	2.4%	7.1%
Two or more races	1,032 ±371	4.2% ±1.5 pp	6.6%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 24,384
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Not Hispanic or Latino	23,736 ±232	97.3% ±0.9 pp	92.7%	80.7%
Hispanic or Latino	648 ±237	2.7% ±1.0 pp	7.3%	19.3%

Hispanic origin and race are separate questions. People of Hispanic or Latino origin may be of any race and appear in both tables. Do not add the Hispanic share to race shares. Race alone and two-or-more-race groups are the mutually exclusive categories of the race table.

Household types, children and living alone

Household types · B11001 · ACS 2020–2024 Households: 9,259
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Married-couple family	5,361 ±298	57.9% ±4.9 pp	48.3%	46.9%
Other family: male householder, no spouse present	277 ±111	3.0% ±1.2 pp	4.3%	5.1%
Other family: female householder, no spouse present	911 ±287	9.8% ±3.0 pp	9.0%	12.2%
Nonfamily: householder living alone	2,233 ±363	24.1% ±3.6 pp	30.9%	28.7%
Nonfamily: householder not living alone	477 ±227	5.2% ±2.4 pp	7.6%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 9,259
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Households with people under 18	3,538 ±280	38.2% ±1.7 pp	28.5%	29.5%
Households without people under 18	5,721 ±649	61.8% ±5.8 pp	71.5%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 9,259
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
One-person nonfamily households	2,233 ±363	24.1% ±3.6 pp	30.9%	28.7%
Two-person households	3,101 ±497	33.5% ±4.9 pp	36.3%	33.8%
Three-person households	1,334 ±268	14.4% ±2.7 pp	12.9%	15.3%
Four-person households	1,436 ±238	15.5% ±2.4 pp	11.4%	12.6%
Five-person households	923 ±267	10.0% ±2.8 pp	5.6%	5.9%
Six-person households	66 ±48 · low precision	0.7% ±0.5 pp · low precision	1.9%	2.2%
Seven or more people	166 ±154 · low precision	1.8% ±1.7 pp · low precision	1.0%	1.4%

A family household contains related people under the Census definition. A nonfamily household can contain one person or unrelated people sharing a home. Households with children can also appear in the household-type and size tables, so those tables must not be added together. Household estimates exclude people living in group quarters from the household universe.

Nativity and languages spoken at home

Nativity · B05002 · ACS 2020–2024 Total population: 24,384
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Native	22,067 ±547	90.5% ±2.2 pp	94.1%	85.9%
Foreign born	2,317 ±547	9.5% ±2.2 pp	5.9%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 22,992
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
English only	20,143 ±815	87.6% ±3.2 pp	90.9%	77.7%
Spanish	485 ±211	2.1% ±0.9 pp	4.7%	13.6%
French, Haitian, or Cajun	103 ±129 · low precision	0.4% ±0.6 pp · low precision	0.3%	0.7%
German or other West Germanic	75 ±79 · low precision	0.3% ±0.3 pp · low precision	0.6%	0.5%
Russian, Polish, or other Slavic	418 ±203	1.8% ±0.9 pp	0.4%	0.7%
Other Indo-European	287 ±244 · low precision	1.2% ±1.1 pp · low precision	0.6%	2.0%
Korean	61 ±63 · low precision	0.3% ±0.3 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	528 ±270 · low precision	2.3% ±1.2 pp · low precision	0.3%	1.1%
Vietnamese	9 ±17 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	385 ±271 · low precision	1.7% ±1.2 pp · low precision	1.0%	1.1%
Arabic	51 ±60 · low precision	0.2% ±0.3 pp · low precision	0.3%	0.5%
Other and unspecified	447 ±384 · low precision	1.9% ±1.7 pp · low precision	0.6%	0.8%

Foreign born means not a U.S. citizen at birth; it includes naturalized citizens. Language categories describe speech at home among people age five and older. A language other than English at home does not establish that someone cannot speak English. This city page uses the published C16001 summary categories because the more detailed B16001 table does not provide these city records in this release.

Educational attainment

Highest completed education · B15003 · ACS 2020–2024 Population age 25 and older: 15,431
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Less than high school graduate	474 ±234	3.1% ±1.5 pp	6.7%	10.4%
High school graduate or equivalency	2,113 ±346	13.7% ±2.1 pp	30.0%	26.0%
Some college, no degree	2,784 ±618	18.0% ±3.9 pp	19.7%	19.1%
Associate’s degree	1,143 ±238	7.4% ±1.5 pp	12.1%	8.8%
Bachelor’s degree	5,520 ±565	35.8% ±3.2 pp	20.9%	21.6%
Graduate or professional degree	3,397 ±495	22.0% ±3.0 pp	10.5%	14.1%

The denominator excludes residents under 25. Each person is counted in the highest attainment category they completed. This table does not measure the quality of local schools or the education level of every current student.

Residence one year earlier

Geographic mobility · B07003 · ACS 2020–2024 Population age 1 and older: 24,142
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Same house	21,696 ±590	89.9% ±2.4 pp	87.1%	87.7%
Moved within same county	1,608 ±485	6.7% ±2.0 pp	6.7%	6.3%
Moved from a different county in the same state	388 ±171	1.6% ±0.7 pp	3.7%	3.1%
Moved from a different state	416 ±261 · low precision	1.7% ±1.1 pp · low precision	2.2%	2.3%
Moved from abroad	34 ±36 · low precision	0.1% ±0.1 pp · low precision	0.4%	0.6%

These are respondents’ residence patterns one year before their survey response, pooled across the five-year window. They are not a net migration count for 2025. A person can move to a different house within the same city or county; moves within the same county should not automatically be interpreted as new arrivals to the city.

Health insurance, internet access and veterans

1.7% of Johnston residents (±0.9 percentage points) had no health insurance coverage when surveyed, compared with 5.0% in Iowa and 8.4% nationally. 93.2% of households subscribe to broadband of any type, including cellular data plans. A subscription is not the same as available service: the FCC National Broadband Map shows providers at a specific address.

City, state and U.S. shares · ACS 2020–2024
Measure	Johnston	Iowa	U.S.	Compared with Iowa
People without health insurance Civilian noninstitutionalized population	1.7% ±0.9 pp · low precision	5.0%	8.4%	Lower
Households with a broadband subscription Households	93.2% ±1.7 pp	88.9%	91.0%	Higher
Veterans Civilian population age 18 and older	5.0% ±1.6 pp	6.5%	6.2%	Not statistically different

Reading and reusing the estimates

The Census table links above lead to the original detailed tables. Counts, source universes and uncertainty are retained in the source observation download for Johnston . Compare these figures with the same survey window; do not compare one city’s five-year estimate with another city’s annual estimate as though they measured the same period. For methods, see uncertainty and denominator calculations.

Read Johnston housing and cost context or return to the city profile.