Sioux City: Demographics & People
Sioux City is home to 86,101 people, in 32,926 households. Population grew 0.5% from 85,651 (2022) to 86,101 (2024). Median age 34.9 years. (1.2y younger than Woodbury County; 2.4y younger than Iowa). Children under 18 are 26% of the population. Population is 62% White (non-Hispanic) and 23% Hispanic or Latino. The community is moderately diverse (Simpson index 0.46). 62% of households are family-led. County is losing 349 residents per year (2022-2023). County health: 38% adult obesity, 17% smoke.
- 2.6 people per household (vs Iowa avg 2.4).
- 38% non-family households (singles, roommates) (vs Iowa 43%).
- 69 dependents per 100 working-age (youth + seniors / 18-64) (vs Iowa 70).
Population & Trend
Population grew 0.5% from 85,651 (2022) to 86,101 (2024) — close to the U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~86,557 (extrapolated at 0.3%/yr trend). Census Bureau Vintage estimate: 87,173.
| Census data vintage | 2024 |
|---|---|
| Population | 25,698 people |
| Annual growth rate · Population change | 0.5% |
| Annual growth rate · Population (2022) | 85,651 |
| Annual growth rate · Population (2024) | 86,101 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | stable |
| Population | 86,101 people (vs Iowa 24,827) |
| Population Estimate | 87,173 |
| Population Note | Census Place population (85,797) covers Plymouth County, Woodbury County |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 34.9y is 4.0 years younger than the U.S. median (38.9y). Children under 18 make up 26% — above the U.S. share of ~22%.
| Age Summary · Median age | 34.9 years (vs Iowa 37.3y) |
|---|---|
| Age Summary · Children Pct | 26.1% |
| Age Summary · Character | young professional |
| Age Summary · Total Pop | 86,101 |
| Age Summary · Under 18 | 22,446 |
| Age Summary · 18 To 34 | 20,673.0× |
| Age Summary · 35 To 64 | 30,178.0× |
| Age Summary · 65 Plus | 12,804 |
| Population under 18 | 22,446 |
| Median age | 34.9 years (vs Iowa 37.3y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 86,101 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.46 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 60,124 |
|---|---|
| Black residents | 4,716 |
| Asian residents | 2,404 |
| Hispanic or Latino residents | 18,780 |
| Diversity Index · Diversity index (Simpson) | 46.0% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 69.9% |
| Asian population | 2.4% (vs Iowa 1.9%) |
| Black population | 5.9% (vs Iowa 3.6%) |
| Hispanic or Latino population | 22.6% (vs Iowa 5.6%) |
| White (non-Hispanic) population | 61.8% (vs Iowa 81.2%) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Ancestry
Self-reported ancestry from Census ACS — what residents report as their ethnic origin, separate from race. Counts can exceed population because people can list multiple ancestries.
Top (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 1.1% are foreign-born — below the U.S. average of 13.9%. 12% have naturalized to U.S. citizenship.
| Residents born in this state | 53,862 |
|---|---|
| Residents born in another state | 20,893 |
| Share born in this state | 62.6% |
| Share born in another state | 37.4% |
| Native-born U.S. citizens | 24.3% |
| Foreign-born residents | 1.1% |
| Naturalized citizens | 12.1% |
| Total foreign-born residents | 9,605 |
| From Europe | 282 |
| From Africa | 1,603 |
| Census Foreign Born · Caribbean | 30 |
Households & Family Composition
32,926 households. Averaging 2.5 people each — matches the U.S. average of 2.5. 62% are family households — below the U.S. share of ~65%. Of 20,367 families, 28% are married couples with children.
| Children under 18 | 22,284 |
|---|---|
| Total families | 20,367 |
| Married couples with children | 5,797 |
| Single-parent households | 1,003 |
| Average household size | 2.53 |
| Women who gave birth (past year) | 13.7% |
| Grandparents living with grandchildren | 764 |
| Grandparents responsible for grandchildren | 277 |
| Family households | 20,488 households (vs Iowa 6,171) |
| Households that are families | 62.2% (vs Iowa 57.4%) |
| Total households | 32,926 households (vs Iowa 10,135) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 8.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 349 residents per year on net (IRS migration data).
| Moved within the county (past year) | 8.7% |
|---|---|
| Migration · People moving in (annual) | 25,428 |
| Migration · People moving out (annual) | 25,777 |
| Migration · Net migration (in − out) | -349 |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Disability
Census ACS measures self-reported functional limitations — vision, hearing, mobility, cognitive, self-care, or independent-living. The U.S. baseline disability rate is about 12–13%; rates trend higher with median age.
| Residents with a disability | 5,448 |
|---|---|
| Disability rate | 6.4% |
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 2,644 residents live in group quarters (3.1% of population).
| Living in group quarters | 2,644 |
|---|
Other
| Census Counties | Plymouth County, Woodbury County |
|---|---|
| Congressional District · District | 4 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 19149 |
| Cdc Birth Rate · State Fips | 19 |
| Cdc Birth Rate · County Fips | 149 |
| Cdc Birth Rate · County | Plymouth |
| Cdc Birth Rate · Birth Rate | 9.1% |
| Cdc Birth Rate · Lower Ci | 6.60 |
| Cdc Birth Rate · Upper Ci | 12.20 |
| Cdc Mortality · Fips | 19149 |
| Cdc Mortality · County | Plymouth County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 753 |
| Cdc Vaccination · Fips | 19149 |
| Cdc Vaccination · County | Plymouth County |
| Cdc Vaccination · Dose1 Pop Pct | 58.3% |
| Cdc Vaccination · Series Complete Pct | 54.3% |
| Cdc Vaccination · Booster Pct | 53.9% |
| Cdc Vaccination · Population 2019 | 25,177 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 22 |
| Family Score · Childcare Centers | 34 |
| Family Score · Youth Sports Orgs | 3 |
| Family Score · Children Pct | 26.1% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 86,101, stable, young professional, middle-class, mixed |
| Town Summary · Population | 86,101 people (vs Iowa 24,827) |
| Town Summary · County | Plymouth County |
Sources: NCES school congressional district assignment · federal dataset cascade