St. Anthony: Demographics & People
3,911 people call St. Anthony home, in 1,258 households. Population grew 2.4% from 3,818 (2022) to 3,911 (2024). Median age 32.4 years. (7.6y younger than Fremont County; 5.2y younger than Idaho). Children under 18 are 23% of the population. Population is 67% White (non-Hispanic) and 22% Hispanic or Latino. The community is somewhat diverse (Simpson index 0.33). 73% of households are family-led. County is losing 303 residents per year (2022-2023). County health: 34% adult obesity, 14% smoke.
- 3.1 people per household.
- 27% non-family households (singles, roommates).
Population & Trend
Population grew 2.4% from 3,818 (2022) to 3,911 (2024) — about 4.1× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~4,007 (extrapolated at 1.2%/yr trend). Census Bureau Vintage estimate: 4,137.
| Census data vintage | 2024 |
|---|---|
| Population | 13,388 people |
| Annual growth rate · Population change | 2.4% |
| Annual growth rate · Population (2022) | 3,818 |
| Annual growth rate · Population (2024) | 3,911 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 3,911 people |
| Population Estimate | 4,137 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 32.4y is 6.5 years younger than the U.S. median (38.9y). Children under 18 make up 23% — above the U.S. share of ~22%.
| Age Summary · Median age | 32.4 years (vs Idaho 37.6y) |
|---|---|
| Age Summary · Children Pct | 23.4% |
| Age Summary · Character | young professional |
| Population under 18 | 916 |
| Median age | 32.4 years (vs Idaho 37.6y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 3,911 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.33 (0 = single group, 1 = perfectly even distribution); this is read as somewhat diverse.
| White residents | 2,971 |
|---|---|
| Black residents | 9 |
| Asian residents | 7 |
| Hispanic or Latino residents | 762 |
| Diversity Index · Diversity index (Simpson) | 33.1% |
| Diversity Index · Diversity label | somewhat diverse |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 79.2% |
| Asian population | 0.4% |
| Black population | 0.4% |
| Hispanic or Latino population | 22.0% |
| White (non-Hispanic) population | 66.6% |
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). 0.4% are foreign-born — below the U.S. average of 13.9%. 6% have naturalized to U.S. citizenship.
| Residents born in this state | 2,115 |
|---|---|
| Residents born in another state | 1,546 |
| Share born in this state | 54.1% |
| Share born in another state | 45.9% |
| Native-born U.S. citizens | 39.5% |
| Foreign-born residents | 0.4% |
| Naturalized citizens | 6.0% |
| Total foreign-born residents | 144 |
| From Africa | 7 |
Households & Family Composition
1,258 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 73% are family households — above the U.S. share of ~65%. Of 842 families, 27% are married couples with children.
| Children under 18 | 908 |
|---|---|
| Total families | 842 |
| Married couples with children | 227 |
| Single-parent households | 52 |
| Average household size | 2.90 |
| Women who gave birth (past year) | 13.9% |
| Grandparents living with grandchildren | 183 |
| Grandparents responsible for grandchildren | 20 |
| Family households | 922 households |
| Households that are families | 73.3% |
| Total households | 1,258 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. 13.6% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 303 residents per year on net (IRS migration data).
| Moved within the county (past year) | 13.6% |
|---|---|
| Migration · People moving in (annual) | 14,093 |
| Migration · People moving out (annual) | 14,396 |
| Migration · Net migration (in − out) | -303 |
| 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 | 397 |
|---|---|
| Disability rate | 11.6% |
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. 343 residents live in group quarters (8.8% of population).
| Living in group quarters | 343 |
|---|
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | ID-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 16,043 |
| Cdc Birth Rate · State Fips | 16 |
| Cdc Birth Rate · County Fips | 43 |
| Cdc Birth Rate · County | Fremont |
| Cdc Birth Rate · Birth Rate | 18.3% |
| Cdc Birth Rate · Lower Ci | 13.50 |
| Cdc Birth Rate · Upper Ci | 24.10 |
| Cdc Mortality · Fips | 16,043 |
| Cdc Mortality · County | Fremont County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 351 |
| Cdc Vaccination · Fips | 16,043 |
| Cdc Vaccination · County | Fremont County |
| Cdc Vaccination · Dose1 Pop Pct | 54.0% |
| Cdc Vaccination · Series Complete Pct | 47.2% |
| Cdc Vaccination · Booster Pct | 40.6% |
| Cdc Vaccination · Population 2019 | 13,099 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 2.50 |
| Family Score · Schools | 3 |
| Family Score · Children Pct | 23.4% |
| Family Score · Rating | limited |
| Town Summary · Key Facts | population 3,911, growing, young professional, middle-class, mixed |
| Town Summary · Population | 3,911 people |
| Town Summary · County | Fremont County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade