St. Ansgar: Demographics & People
1,206 people call St. Ansgar home, in 513 households. Population grew 4.3% from 1,156 (2022) to 1,206 (2024). Median age 40.0 years. (1.9y younger than Mitchell County; 1.2y older than Iowa). Children under 18 are 25% of the population. Population is 91% White (non-Hispanic) and 6% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.13). 63% of households are family-led. County health: 45% adult obesity, 20% smoke.
- 2.4 people per household.
- 37% non-family households (singles, roommates).
Population & Trend
Population grew 4.3% from 1,156 (2022) to 1,206 (2024) — about 7.2× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~1,258 (extrapolated at 2.2%/yr trend). Census Bureau Vintage estimate: 1,331.
| Census data vintage | 2024 |
|---|---|
| Population | 10,565 people |
| Annual growth rate · Population change | 4.3% |
| Annual growth rate · Population (2022) | 1,156 |
| Annual growth rate · Population (2024) | 1,206 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 1,206 people |
| Population Estimate | 1,331 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 40.0y is 1.1 years older than the U.S. median (38.9y). Children under 18 make up 25% — above the U.S. share of ~22%.
| Age Summary · Median age | 40.0 years (vs Iowa 38.8y) |
|---|---|
| Age Summary · Children Pct | 24.6% |
| Age Summary · Character | established |
| Population under 18 | 297 |
| Median age | 40.0 years (vs Iowa 38.8y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 1,206 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.13 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 1,101 |
|---|---|
| Asian residents | 6 |
| Hispanic or Latino residents | 78 |
| Diversity Index · Diversity index (Simpson) | 13.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 92.9% |
| Asian population | 0.8% |
| Hispanic or Latino population | 6.0% |
| White (non-Hispanic) population | 91.0% |
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 (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 1.6% are foreign-born — below the U.S. average of 13.9%. 1% have naturalized to U.S. citizenship.
| Residents born in this state | 821 |
|---|---|
| Residents born in another state | 356 |
| Share born in this state | 68.1% |
| Share born in another state | 31.9% |
| Native-born U.S. citizens | 29.5% |
| Foreign-born residents | 1.6% |
| Naturalized citizens | 0.8% |
| Total foreign-born residents | 10 |
| From Africa | 9 |
Households & Family Composition
513 households. Averaging 2.3 people each — smaller than the U.S. average of 2.5. 63% are family households — below the U.S. share of ~65%. Of 304 families, 23% are married couples with children.
| Children under 18 | 253 |
|---|---|
| Total families | 304 |
| Married couples with children | 71 |
| Single-parent households | 24 |
| Average household size | 2.28 |
| Women who gave birth (past year) | 11.6% |
| Grandparents living with grandchildren | 2 |
| Grandparents responsible for grandchildren | 2 |
| Family households | 321 households |
| Households that are families | 62.6% |
| Total households | 513 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. 14.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Moved within the county (past year) | 14.7% |
|---|---|
| Migration · People moving in (annual) | 9,985 |
| Migration · People moving out (annual) | 9,952 |
| Migration · Net migration (in − out) | 33 |
| Migration · Population growing | Yes |
| 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 | 94 |
|---|---|
| Disability rate | 8.5% |
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. 37 residents live in group quarters (3.1% of population).
| Living in group quarters | 37 |
|---|
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | IA-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 19,131 |
| Cdc Birth Rate · State Fips | 19 |
| Cdc Birth Rate · County Fips | 131 |
| Cdc Birth Rate · County | Mitchell |
| Cdc Birth Rate · Birth Rate | 6.8% |
| Cdc Birth Rate · Lower Ci | 4.00 |
| Cdc Birth Rate · Upper Ci | 10.90 |
| Cdc Mortality · Fips | 19,131 |
| Cdc Mortality · County | Mitchell County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 477 |
| Cdc Vaccination · Fips | 19,131 |
| Cdc Vaccination · County | Mitchell County |
| Cdc Vaccination · Dose1 Pop Pct | 53.0% |
| Cdc Vaccination · Series Complete Pct | 50.2% |
| Cdc Vaccination · Booster Pct | 63.2% |
| Cdc Vaccination · Population 2019 | 10,586 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 2.50 |
| Family Score · Schools | 3 |
| Family Score · Children Pct | 24.6% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 1,206, growing, established, upper-middle, mixed |
| Town Summary · Population | 1,206 people |
| Town Summary · County | Mitchell County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade