St. Regis: Demographics & People
406 people call St. Regis home, in 152 households. Population grew 18.0% from 344 (2022) to 406 (2024). Median age 36.5 years. (13.5y younger than Mineral County; 4.3y younger than Montana). Children under 18 are 35% of the population. Population is 84% White (non-Hispanic) and 3% Hispanic or Latino. The community is relatively homogeneous (Simpson index 0.10). 71% of households are family-led. County is gaining 335 residents per year (2022-2023). County health: 35% adult obesity, 18% smoke.
- 2.7 people per household.
- 29% non-family households (singles, roommates).
Population & Trend
Population grew 18.0% from 344 (2022) to 406 (2024) — about 30.0× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~482 (extrapolated at 9.0%/yr trend). Census Bureau Vintage estimate: 597.
| Census data vintage | 2024 |
|---|---|
| Population | 4,535 people |
| Annual growth rate · Population change | 18.0% |
| Annual growth rate · Population (2022) | 344 |
| Annual growth rate · Population (2024) | 406 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 406 people |
| Population Estimate | 597 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 36.5y is 2.4 years younger than the U.S. median (38.9y). Children under 18 make up 35% — above the U.S. share of ~22%.
| Age Summary · Median age | 36.5 years (vs Montana 40.8y) |
|---|---|
| Age Summary · Children Pct | 35.0% |
| Age Summary · Character | family-oriented |
| Population under 18 | 142 |
| Median age | 36.5 years (vs Montana 40.8y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 406 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.10 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 319 |
|---|---|
| Black residents | 2 |
| Hispanic or Latino residents | 16 |
| Diversity Index · Diversity index (Simpson) | 10.2% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 3 |
| Diversity Index · Largest group share | 94.7% |
| Black population | 0.2% |
| Hispanic or Latino population | 3.4% |
| White (non-Hispanic) population | 83.5% |
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 | 118 |
|---|---|
| Residents born in another state | 284 |
| Share born in this state | 29.1% |
| Share born in another state | 70.9% |
| Native-born U.S. citizens | 70.0% |
| Naturalized citizens | 1.0% |
| Total foreign-born residents | 70 |
Households & Family Composition
152 households. Averaging 2.7 people each — larger than the U.S. average of 2.5. 71% are family households — above the U.S. share of ~65%. Of 84 families, 24% are married couples with children.
| Children under 18 | 140 |
|---|---|
| Total families | 84 |
| Married couples with children | 20 |
| Single-parent households | 4 |
| Average household size | 2.70 |
| Women who gave birth (past year) | 23.1% |
| Grandparents living with grandchildren | 39 |
| Grandparents responsible for grandchildren | 12 |
| Family households | 108 households |
| Households that are families | 71.1% |
| Total households | 152 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. 12.1% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 335 residents per year on net (IRS migration data).
| Moved within the county (past year) | 12.1% |
|---|---|
| Migration · People moving in (annual) | 4,701 |
| Migration · People moving out (annual) | 4,366 |
| Migration · Net migration (in − out) | 335 |
| 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 | 34 |
|---|---|
| Disability rate | 10.8% |
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. 6 residents live in group quarters (1.5% of population).
| Living in group quarters | 6 |
|---|
Other
| Congressional District · District | 1 |
|---|---|
| Congressional District · Formatted | MT-01 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 30,061 |
| Cdc Birth Rate · State Fips | 30 |
| Cdc Birth Rate · County Fips | 61 |
| Cdc Birth Rate · County | Mineral |
| Cdc Birth Rate · Birth Rate | 29.6% |
| Cdc Birth Rate · Lower Ci | 17.60 |
| Cdc Birth Rate · Upper Ci | 46.50 |
| Cdc Mortality · Fips | 30,061 |
| Cdc Mortality · County | Mineral County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 186 |
| Cdc Vaccination · Fips | 30,061 |
| Cdc Vaccination · County | Mineral County |
| Cdc Vaccination · Dose1 Pop Pct | 65.0% |
| Cdc Vaccination · Series Complete Pct | 56.7% |
| Cdc Vaccination · Booster Pct | 54.4% |
| Cdc Vaccination · Population 2019 | 4,397 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 4.00 |
| Family Score · Schools | 6 |
| Family Score · Children Pct | 35.0% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 406, booming, family-oriented, middle-class, blue collar |
| Town Summary · Population | 406 people |
| Town Summary · County | Mineral County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade