Iroquois: Demographics & People
Iroquois is home to 389 people, in 164 households. Population shrank 8.5% from 425 (2022) to 389 (2024). Median age 30.8 years. (11.3y younger than Kingsbury County; 5.6y younger than South Dakota). Children under 18 are 25% of the population. Population is 90% White (non-Hispanic) and 1% Asian. 57% of households are family-led. County is losing 1,016 residents per year (2022-2023). County health: 35% adult obesity, 19% smoke.
- 2.4 people per household (vs South Dakota avg 2.4).
- 43% non-family households (singles, roommates) (vs South Dakota 44%).
- 59 dependents per 100 working-age (youth + seniors / 18-64) (vs South Dakota 73).
Population & Trend
Population shrank 8.5% from 425 (2022) to 389 (2024). Estimated 2026 population: ~356 (extrapolated at -4.2%/yr trend). Census Bureau Vintage estimate: 316.
| Census data vintage | 2024 |
|---|---|
| Population | 19,149 people |
| Annual growth rate · Population change | -8.5% |
| Annual growth rate · Population (2022) | 425 |
| Annual growth rate · Population (2024) | 389 |
| Annual growth rate · Trend category | shrinking |
| Population | 389 people (vs South Dakota 15,649) |
| Population Estimate | 316 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 30.8y is 8.1 years younger than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 30.8 years (vs South Dakota 36.4y) |
|---|---|
| Age Summary · Children Pct | 25.4% |
| Age Summary · Character | young professional |
| Age Summary · Total Pop | 389 |
| Age Summary · Under 18 | 99 |
| Age Summary · 18 To 34 | 99.0× |
| Age Summary · 35 To 64 | 146.0× |
| Age Summary · 65 Plus | 45 |
| Population under 18 | 99 |
| Median age | 30.8 years (vs South Dakota 36.4y) |
Sources: Census ACS 5-Year 2024 — place-level B01001 query · Census ACS 5-Year 2023 · Refreshed 2026-04-29
Race, Ethnicity & Diversity
Of 389 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 389 |
|---|---|
| Asian residents | 2 |
| Diversity Index · Interpretation | less diverse |
| Asian population | 0.8% (vs South Dakota 1.3%) |
| White (non-Hispanic) population | 90.0% (vs South Dakota 78.0%) |
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 (6)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 1.5% are foreign-born — below the U.S. average of 13.9%. 1% have naturalized to U.S. citizenship.
| Residents born in this state | 314 |
|---|---|
| Residents born in another state | 64 |
| Share born in this state | 80.7% |
| Share born in another state | 19.3% |
| Native-born U.S. citizens | 16.5% |
| Foreign-born residents | 1.5% |
| Naturalized citizens | 1.3% |
| Total foreign-born residents | 2 |
| From Africa | 2 |
Households & Family Composition
164 households. Averaging 2.6 people each — matches the U.S. average of 2.5. 57% are family households — below the U.S. share of ~65%. Of 104 families, 31% are married couples with children.
| Children under 18 | 118 |
|---|---|
| Total families | 104 |
| Married couples with children | 32 |
| Single-parent households | 7 |
| Average household size | 2.58 |
| Women who gave birth (past year) | 10.7% |
| Grandparents living with grandchildren | 3 |
| Family households | 94 households (vs South Dakota 3,864) |
| Households that are families | 57.3% (vs South Dakota 56.4%) |
| Total households | 164 households (vs South Dakota 7,305) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 7.5% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 1,016 residents per year on net (IRS migration data).
| Moved within the county (past year) | 7.5% |
|---|---|
| Migration · People moving in (annual) | 17,076 |
| Migration · People moving out (annual) | 18,092 |
| Migration · Net migration (in − out) | -1,016 |
| 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 | 42 |
|---|---|
| Disability rate | 9.9% |
Other
| Congressional District · Congress | 118th |
|---|---|
| Cdc Birth Rate · Fips | 46005 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 005 |
| Cdc Birth Rate · County | Beadle |
| Cdc Birth Rate · Birth Rate | 53.9% |
| Cdc Birth Rate · Lower Ci | 45.10 |
| Cdc Birth Rate · Upper Ci | 63.90 |
| Cdc Mortality · Fips | 46005 |
| Cdc Mortality · County | Beadle County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 559 |
| Cdc Vaccination · Fips | 46005 |
| Cdc Vaccination · County | Beadle County |
| Cdc Vaccination · Dose1 Pop Pct | 68.1% |
| Cdc Vaccination · Series Complete Pct | 52.9% |
| Cdc Vaccination · Booster Pct | 48.3% |
| Cdc Vaccination · Population 2019 | 18,453 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 3.50 |
| Family Score · Schools | 5 |
| Family Score · Children Pct | 25.4% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 389, shrinking, young professional, middle-class, mixed |
| Town Summary · Population | 389 people (vs South Dakota 15,649) |
| Town Summary · County | Beadle County |
Sources: NCES school congressional district assignment · federal dataset cascade