Storm Lake, Iowa demographics

Storm Lake, IA demographics: median age 30.9; 18.9% of adults 25+ hold a bachelor’s degree. Age, race, households, languages and education, ACS 2020–2024 with margins of error.

ACS 2020–2024 · Storm Lake city, Iowa · Incorporated city · GEOID 1975630. The survey estimates a population of 11,428 for its five-year window. This is separate from the annual July 2025 population estimate on the city overview.

Median age in Storm Lake is 30.9 years, with a 90% margin of error of 1.2 years. There are 3,975 households (±164). 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	30.9 ±1.2	38.6 ±0.2	38.9 ±0.1

Age groups · B01001 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Under 18	3,083 ±339	27.0% ±3.0 pp	22.9%	22.0%
18–34	3,121 ±326	27.3% ±2.8 pp	22.5%	22.8%
35–64	3,792 ±453	33.2% ±4.0 pp	36.5%	38.0%
65 and older	1,432 ±245	12.5% ±2.1 pp	18.1%	17.2%

Sex categories as published by ACS · B01001 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Male	5,523 ±176	48.3% ±1.5 pp	50.2%	49.5%
Female	5,905 ±168	51.7% ±1.5 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: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
White alone	5,261 ±690	46.0% ±6.0 pp	84.1%	61.0%
Black or African American alone	431 ±138	3.8% ±1.2 pp	3.9%	12.2%
American Indian and Alaska Native alone	70 ±73 · low precision	0.6% ±0.6 pp · low precision	0.4%	0.9%
Asian alone	1,471 ±273	12.9% ±2.4 pp	2.5%	6.0%
Native Hawaiian and Other Pacific Islander alone	463 ±105	4.1% ±0.9 pp	0.2%	0.2%
Some other race alone	1,909 ±593	16.7% ±5.2 pp	2.4%	7.1%
Two or more races	1,823 ±516	16.0% ±4.5 pp	6.6%	12.6%

Hispanic or Latino origin · B03003 · ACS 2020–2024 Total population: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Not Hispanic or Latino	6,459 ±238	56.5% ±2.1 pp	92.7%	80.7%
Hispanic or Latino	4,969 ±226	43.5% ±2.0 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: 3,975
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Married-couple family	1,718 ±294	43.2% ±7.2 pp	48.3%	46.9%
Other family: male householder, no spouse present	96 ±91 · low precision	2.4% ±2.3 pp · low precision	4.3%	5.1%
Other family: female householder, no spouse present	612 ±181	15.4% ±4.5 pp	9.0%	12.2%
Nonfamily: householder living alone	1,075 ±229	27.0% ±5.7 pp	30.9%	28.7%
Nonfamily: householder not living alone	474 ±223	11.9% ±5.6 pp	7.6%	7.0%

Households with children · B11005 · ACS 2020–2024 Households: 3,975
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Households with people under 18	1,299 ±189	32.7% ±4.6 pp	28.5%	29.5%
Households without people under 18	2,676 ±267	67.3% ±6.1 pp	71.5%	70.5%

Household size · B11016 · ACS 2020–2024 Households: 3,975
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
One-person nonfamily households	1,075 ±229	27.0% ±5.7 pp	30.9%	28.7%
Two-person households	1,222 ±308	30.7% ±7.7 pp	36.3%	33.8%
Three-person households	635 ±207	16.0% ±5.2 pp	12.9%	15.3%
Four-person households	553 ±214	13.9% ±5.3 pp	11.4%	12.6%
Five-person households	358 ±152	9.0% ±3.8 pp	5.6%	5.9%
Six-person households	21 ±33 · low precision	0.5% ±0.8 pp · low precision	1.9%	2.2%
Seven or more people	111 ±70 · low precision	2.8% ±1.8 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: 11,428
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Native	7,963 ±443	69.7% ±3.9 pp	94.1%	85.9%
Foreign born	3,465 ±440	30.3% ±3.8 pp	5.9%	14.1%

Language spoken at home · C16001 · ACS 2020–2024 Population age 5 and older: 10,592
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
English only	4,946 ±425	46.7% ±4.0 pp	90.9%	77.7%
Spanish	3,954 ±324	37.3% ±3.0 pp	4.7%	13.6%
French, Haitian, or Cajun	22 ±33 · low precision	0.2% ±0.3 pp · low precision	0.3%	0.7%
German or other West Germanic	16 ±28 · low precision	0.2% ±0.3 pp · low precision	0.6%	0.5%
Russian, Polish, or other Slavic	0 ±16 · low precision	0.0% ±0.2 pp · low precision	0.4%	0.7%
Other Indo-European	0 ±16 · low precision	0.0% ±0.2 pp · low precision	0.6%	2.0%
Korean	19 ±28 · low precision	0.2% ±0.3 pp · low precision	0.1%	0.3%
Chinese, including Mandarin and Cantonese	0 ±16 · low precision	0.0% ±0.2 pp · low precision	0.3%	1.1%
Vietnamese	0 ±16 · low precision	0.0% ±0.2 pp · low precision	0.3%	0.5%
Tagalog, including Filipino	47 ±76 · low precision	0.4% ±0.7 pp · low precision	0.1%	0.6%
Other Asian and Pacific Island	1,298 ±248	12.3% ±2.3 pp	1.0%	1.1%
Arabic	11 ±18 · low precision	0.1% ±0.2 pp · low precision	0.3%	0.5%
Other and unspecified	279 ±142 · low precision	2.6% ±1.3 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: 6,751
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Less than high school graduate	1,873 ±406	27.7% ±5.9 pp	6.7%	10.4%
High school graduate or equivalency	2,227 ±371	33.0% ±5.4 pp	30.0%	26.0%
Some college, no degree	804 ±194	11.9% ±2.8 pp	19.7%	19.1%
Associate’s degree	572 ±209	8.5% ±3.1 pp	12.1%	8.8%
Bachelor’s degree	789 ±209	11.7% ±3.1 pp	20.9%	21.6%
Graduate or professional degree	486 ±176	7.2% ±2.6 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: 11,181
Category	Count ± MOE	Share ± MOE (pp)	Iowa	U.S.
Same house	10,368 ±236	92.7% ±1.9 pp	87.1%	87.7%
Moved within same county	202 ±128 · low precision	1.8% ±1.1 pp · low precision	6.7%	6.3%
Moved from a different county in the same state	275 ±150 · low precision	2.5% ±1.3 pp · low precision	3.7%	3.1%
Moved from a different state	315 ±169 · low precision	2.8% ±1.5 pp · low precision	2.2%	2.3%
Moved from abroad	21 ±24 · low precision	0.2% ±0.2 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

7.2% of Storm Lake residents (±2.5 percentage points) had no health insurance coverage when surveyed, compared with 5.0% in Iowa and 8.4% nationally. 95.1% 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	Storm Lake	Iowa	U.S.	Compared with Iowa
People without health insurance Civilian noninstitutionalized population	7.2% ±2.5 pp	5.0%	8.4%	Not statistically different
Households with a broadband subscription Households	95.1% ±3.0 pp	88.9%	91.0%	Higher
Veterans Civilian population age 18 and older	2.4% ±1.0 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 Storm Lake . 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 Storm Lake housing and cost context or return to the city profile.