Sioux City, Iowa demographics

Sioux City, IA demographics: median age 34.9; 22.9% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Sioux City city, Iowa · Incorporated city · GEOID 1973335. The survey estimates a population of 86,101 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Sioux City is 34.9 years, with a 90% margin of error of 0.6 years. There are 32,926 households (±452). 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	34.9 ±0.6	38.6 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 86,101
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Under 18	22,446 ±771	26.1% ±0.9 pp	22.9%	22.0%
18–34	20,673 ±717	24.0% ±0.8 pp	22.5%	22.8%
35–64	30,178 ±1,086	35.0% ±1.3 pp	36.5%	38.0%
65 and older	12,804 ±718	14.9% ±0.8 pp	18.1%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 86,101
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Male	43,276 ±338	50.3% ±0.4 pp	50.2%	49.5%
Female	42,825 ±337	49.7% ±0.4 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: 86,101
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
White alone	57,399 ±1,054	66.7% ±1.2 pp	84.1%	61.0%
Black or African American alone	5,193 ±439	6.0% ±0.5 pp	3.9%	12.2%
American Indian and Alaska Native alone	1,782 ±305	2.1% ±0.4 pp	0.4%	0.9%
Asian alone	2,048 ±337	2.4% ±0.4 pp	2.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	775 ±61	0.9% ±0.1 pp	0.2%	0.2%
Some other race alone	4,743 ±687	5.5% ±0.8 pp	2.4%	7.1%
Two or more races	14,161 ±1,128	16.4% ±1.3 pp	6.6%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 86,101
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Not Hispanic or Latino	66,640 ±361	77.4% ±0.4 pp	92.7%	80.7%
Hispanic or Latino	19,461 ±359	22.6% ±0.4 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: 32,926
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Married-couple family	13,218 ±628	40.1% ±1.8 pp	48.3%	46.9%
Other family: male householder, no spouse present	2,160 ±402	6.6% ±1.2 pp	4.3%	5.1%
Other family: female householder, no spouse present	5,110 ±525	15.5% ±1.6 pp	9.0%	12.2%
Nonfamily: householder living alone	10,226 ±663	31.1% ±2.0 pp	30.9%	28.7%
Nonfamily: householder not living alone	2,212 ±365	6.7% ±1.1 pp	7.6%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 32,926
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Households with people under 18	10,738 ±561	32.6% ±1.6 pp	28.5%	29.5%
Households without people under 18	22,188 ±738	67.4% ±2.0 pp	71.5%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 32,926
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
One-person nonfamily households	10,226 ±663	31.1% ±2.0 pp	30.9%	28.7%
Two-person households	10,306 ±695	31.3% ±2.1 pp	36.3%	33.8%
Three-person households	4,245 ±493	12.9% ±1.5 pp	12.9%	15.3%
Four-person households	4,532 ±565	13.8% ±1.7 pp	11.4%	12.6%
Five-person households	2,433 ±314	7.4% ±0.9 pp	5.6%	5.9%
Six-person households	698 ±215	2.1% ±0.7 pp	1.9%	2.2%
Seven or more people	486 ±187	1.5% ±0.6 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: 86,101
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Native	75,686 ±771	87.9% ±0.9 pp	94.1%	85.9%
Foreign born	10,415 ±767	12.1% ±0.9 pp	5.9%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 79,917
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
English only	62,669 ±1,210	78.4% ±1.5 pp	90.9%	77.7%
Spanish	13,065 ±747	16.3% ±0.9 pp	4.7%	13.6%
French, Haitian, or Cajun	556 ±354 · low precision	0.7% ±0.4 pp · low precision	0.3%	0.7%
German or other West Germanic	526 ±254	0.7% ±0.3 pp	0.6%	0.5%
Russian, Polish, or other Slavic	2 ±24 · low precision	0.0% ±0.0 pp · low precision	0.4%	0.7%
Other Indo-European	106 ±63 · low precision	0.1% ±0.1 pp · low precision	0.6%	2.0%
Korean	20 ±25 · low precision	0.0% ±0.0 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	59 ±70 · low precision	0.1% ±0.1 pp · low precision	0.3%	1.1%
Vietnamese	652 ±232	0.8% ±0.3 pp	0.3%	0.5%
Tagalog, including Filipino	184 ±135 · low precision	0.2% ±0.2 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	976 ±403	1.2% ±0.5 pp	1.0%	1.1%
Arabic	57 ±83 · low precision	0.1% ±0.1 pp · low precision	0.3%	0.5%
Other and unspecified	1,045 ±404	1.3% ±0.5 pp	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: 54,115
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Less than high school graduate	7,780 ±745	14.4% ±1.4 pp	6.7%	10.4%
High school graduate or equivalency	17,596 ±1,036	32.5% ±1.9 pp	30.0%	26.0%
Some college, no degree	10,512 ±741	19.4% ±1.4 pp	19.7%	19.1%
Associate’s degree	5,822 ±636	10.8% ±1.2 pp	12.1%	8.8%
Bachelor’s degree	8,101 ±659	15.0% ±1.2 pp	20.9%	21.6%
Graduate or professional degree	4,304 ±528	8.0% ±1.0 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: 85,212
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Same house	77,760 ±973	91.3% ±1.1 pp	87.1%	87.7%
Moved within same county	3,660 ±612	4.3% ±0.7 pp	6.7%	6.3%
Moved from a different county in the same state	1,325 ±394	1.6% ±0.5 pp	3.7%	3.1%
Moved from a different state	2,158 ±523	2.5% ±0.6 pp	2.2%	2.3%
Moved from abroad	309 ±139	0.4% ±0.2 pp	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

8.4% of Sioux City residents (±0.8 percentage points) had no health insurance coverage when surveyed, compared with 5.0% in Iowa and 8.4% nationally. 86.9% 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	Sioux City	Iowa	U.S.	Compared with Iowa
People without health insurance Civilian noninstitutionalized population	8.4% ±0.8 pp	5.0%	8.4%	Higher
Households with a broadband subscription Households	86.9% ±1.6 pp	88.9%	91.0%	Lower
Veterans Civilian population age 18 and older	5.3% ±0.6 pp	6.5%	6.2%	Lower

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 Sioux City . 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 Sioux City housing and cost context or return to the city profile.