Marshalltown, Iowa demographics

Marshalltown, IA demographics: median age 35.7; 20.9% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Marshalltown city, Iowa · Incorporated city · GEOID 1949755. The survey estimates a population of 27,626 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Marshalltown is 35.7 years, with a 90% margin of error of 0.9 years. There are 10,135 households (±284). 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	35.7 ±0.9	38.6 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 27,626
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Under 18	7,458 ±470	27.0% ±1.7 pp	22.9%	22.0%
18–34	6,085 ±420	22.0% ±1.5 pp	22.5%	22.8%
35–64	9,520 ±606	34.5% ±2.2 pp	36.5%	38.0%
65 and older	4,563 ±410	16.5% ±1.5 pp	18.1%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 27,626
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Male	14,005 ±229	50.7% ±0.8 pp	50.2%	49.5%
Female	13,621 ±227	49.3% ±0.8 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: 27,626
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
White alone	16,688 ±607	60.4% ±2.2 pp	84.1%	61.0%
Black or African American alone	782 ±298	2.8% ±1.1 pp	3.9%	12.2%
American Indian and Alaska Native alone	467 ±339 · low precision	1.7% ±1.2 pp · low precision	0.4%	0.9%
Asian alone	1,364 ±319	4.9% ±1.2 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	3,133 ±795	11.3% ±2.9 pp	2.4%	7.1%
Two or more races	5,192 ±906	18.8% ±3.3 pp	6.6%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 27,626
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Not Hispanic or Latino	18,183 ±179	65.8% ±0.6 pp	92.7%	80.7%
Hispanic or Latino	9,443 ±180	34.2% ±0.7 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: 10,135
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Married-couple family	4,831 ±343	47.7% ±3.1 pp	48.3%	46.9%
Other family: male householder, no spouse present	471 ±142	4.6% ±1.4 pp	4.3%	5.1%
Other family: female householder, no spouse present	869 ±204	8.6% ±2.0 pp	9.0%	12.2%
Nonfamily: householder living alone	3,068 ±294	30.3% ±2.8 pp	30.9%	28.7%
Nonfamily: householder not living alone	896 ±273	8.8% ±2.7 pp	7.6%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 10,135
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Households with people under 18	3,385 ±254	33.4% ±2.3 pp	28.5%	29.5%
Households without people under 18	6,750 ±365	66.6% ±3.1 pp	71.5%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 10,135
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
One-person nonfamily households	3,068 ±294	30.3% ±2.8 pp	30.9%	28.7%
Two-person households	3,108 ±406	30.7% ±3.9 pp	36.3%	33.8%
Three-person households	1,580 ±246	15.6% ±2.4 pp	12.9%	15.3%
Four-person households	942 ±207	9.3% ±2.0 pp	11.4%	12.6%
Five-person households	825 ±225	8.1% ±2.2 pp	5.6%	5.9%
Six-person households	366 ±134	3.6% ±1.3 pp	1.9%	2.2%
Seven or more people	246 ±116	2.4% ±1.1 pp	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: 27,626
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Native	22,078 ±576	79.9% ±2.1 pp	94.1%	85.9%
Foreign born	5,548 ±577	20.1% ±2.1 pp	5.9%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 26,078
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
English only	17,107 ±605	65.6% ±2.3 pp	90.9%	77.7%
Spanish	7,241 ±414	27.8% ±1.6 pp	4.7%	13.6%
French, Haitian, or Cajun	193 ±162 · low precision	0.7% ±0.6 pp · low precision	0.3%	0.7%
German or other West Germanic	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.6%	0.5%
Russian, Polish, or other Slavic	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.4%	0.7%
Other Indo-European	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.6%	2.0%
Korean	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	59 ±99 · low precision	0.2% ±0.4 pp · low precision	0.3%	1.1%
Vietnamese	0 ±19 · low precision	0.0% ±0.1 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	24 ±58 · low precision	0.1% ±0.2 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	1,153 ±361	4.4% ±1.4 pp	1.0%	1.1%
Arabic	140 ±205 · low precision	0.5% ±0.8 pp · low precision	0.3%	0.5%
Other and unspecified	161 ±136 · low precision	0.6% ±0.5 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: 17,501
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Less than high school graduate	3,190 ±495	18.2% ±2.8 pp	6.7%	10.4%
High school graduate or equivalency	5,463 ±560	31.2% ±3.2 pp	30.0%	26.0%
Some college, no degree	3,356 ±396	19.2% ±2.2 pp	19.7%	19.1%
Associate’s degree	1,836 ±286	10.5% ±1.6 pp	12.1%	8.8%
Bachelor’s degree	2,336 ±340	13.3% ±1.9 pp	20.9%	21.6%
Graduate or professional degree	1,320 ±278	7.5% ±1.6 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: 27,271
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Same house	24,641 ±552	90.4% ±2.0 pp	87.1%	87.7%
Moved within same county	1,262 ±452	4.6% ±1.7 pp	6.7%	6.3%
Moved from a different county in the same state	916 ±336	3.4% ±1.2 pp	3.7%	3.1%
Moved from a different state	320 ±150	1.2% ±0.6 pp	2.2%	2.3%
Moved from abroad	132 ±107 · low precision	0.5% ±0.4 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

6.4% of Marshalltown residents (±1.4 percentage points) had no health insurance coverage when surveyed, compared with 5.0% in Iowa and 8.4% nationally. 87.5% 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	Marshalltown	Iowa	U.S.	Compared with Iowa
People without health insurance Civilian noninstitutionalized population	6.4% ±1.4 pp	5.0%	8.4%	Not statistically different
Households with a broadband subscription Households	87.5% ±2.3 pp	88.9%	91.0%	Not statistically different
Veterans Civilian population age 18 and older	9.2% ±1.0 pp	6.5%	6.2%	Higher

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 Marshalltown . 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 Marshalltown housing and cost context or return to the city profile.