St. Anthony: Demographics & People
About 92 people live in St. Anthony, in 43 households. Population shrank 1.1% from 93 (2022) to 92 (2024). Median age 47.4 years. (8.9y older than Marshall County; 8.6y older than Iowa). Children under 18 are 27% of the population. Population is 78% White (non-Hispanic) and 14% Asian. The community is moderately diverse (Simpson index 0.43). 54% of households are family-led. County is losing 153 residents per year (2022-2023). County health: 41% adult obesity, 17% smoke.
- 2.1 people per household.
- 46% non-family households (singles, roommates).
Population & Trend
Population shrank 1.1% from 93 (2022) to 92 (2024). Estimated 2026 population: ~91 (extrapolated at -0.5%/yr trend). Census Bureau Vintage estimate: 89.
| Census data vintage | 2024 |
|---|---|
| Population | 40,105 people |
| Annual growth rate · Population change | -1.1% |
| Annual growth rate · Population (2022) | 93 |
| Annual growth rate · Population (2024) | 92 |
| Annual growth rate · Trend category | declining |
| Population | 92 people |
| Population Estimate | 89 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 47.4y is 8.5 years older than the U.S. median (38.9y). Children under 18 make up 27% — above the U.S. share of ~22%.
| Age Summary · Median age | 47.4 years (vs Iowa 38.8y) |
|---|---|
| Age Summary · Children Pct | 27.2% |
| Age Summary · Character | established |
| Population under 18 | 25 |
| Median age | 47.4 years (vs Iowa 38.8y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 92 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.43 (0 = single group, 1 = perfectly even distribution); this is read as moderately diverse.
| White residents | 68 |
|---|---|
| Asian residents | 14 |
| Hispanic or Latino residents | 11 |
| Diversity Index · Diversity index (Simpson) | 42.9% |
| Diversity Index · Diversity label | moderately diverse |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 73.1% |
| Asian population | 14.1% |
| Hispanic or Latino population | 7.6% |
| White (non-Hispanic) population | 78.3% |
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).
| Residents born in this state | 64 |
|---|---|
| Residents born in another state | 20 |
| Share born in this state | 69.6% |
| Share born in another state | 30.4% |
| Native-born U.S. citizens | 21.7% |
| Naturalized citizens | 8.7% |
| Total foreign-born residents | 6 |
| From Africa | 6 |
| Census Foreign Born · Caribbean | 2 |
Households & Family Composition
43 households. Averaging 2.2 people each — smaller than the U.S. average of 2.5. 54% are family households — below the U.S. share of ~65%. Of 23 families, 9% are married couples with children.
| Children under 18 | 26 |
|---|---|
| Total families | 23 |
| Married couples with children | 2 |
| Single-parent households | 9 |
| Average household size | 2.21 |
| Women who gave birth (past year) | 31.6% |
| Grandparents living with grandchildren | 443 |
| Grandparents responsible for grandchildren | 153 |
| Family households | 23 households |
| Households that are families | 53.5% |
| Total households | 43 households |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Residential Stability & Migration
How long residents have lived here and where they came from. 2.2% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 153 residents per year on net (IRS migration data).
| Lived in same home a year ago | 92.0% |
|---|---|
| Moved within the county (past year) | 2.2% |
| Migration · People moving in (annual) | 36,517 |
| Migration · People moving out (annual) | 36,670 |
| Migration · Net migration (in − out) | -153 |
| 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 | 13 |
|---|---|
| Disability rate | 14.8% |
Other
| Congressional District · District | 4 |
|---|---|
| Congressional District · Formatted | IA-04 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 19,127 |
| Cdc Birth Rate · State Fips | 19 |
| Cdc Birth Rate · County Fips | 127 |
| Cdc Birth Rate · County | Marshall |
| Cdc Birth Rate · Birth Rate | 25.6% |
| Cdc Birth Rate · Lower Ci | 21.70 |
| Cdc Birth Rate · Upper Ci | 30.00 |
| Cdc Mortality · Fips | 19,127 |
| Cdc Mortality · County | Marshall County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 1,696 |
| Cdc Vaccination · Fips | 19,127 |
| Cdc Vaccination · County | Marshall County |
| Cdc Vaccination · Dose1 Pop Pct | 75.6% |
| Cdc Vaccination · Series Complete Pct | 69.1% |
| Cdc Vaccination · Booster Pct | 59.0% |
| Cdc Vaccination · Population 2019 | 39,369 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 9.50 |
| Family Score · Schools | 17 |
| Family Score · Children Pct | 27.2% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 92, declining, established, middle-class, blue collar |
| Town Summary · Population | 92 people |
| Town Summary · County | Marshall County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade