St. Charles: Demographics & People
Census counts 145 people in St. Charles, in 47 households. Population shrank 13.7% from 168 (2022) to 145 (2024). Median age 34.1 years. (6.4y younger than Bear Lake County; 3.5y younger than Idaho). Children under 18 are 18% of the population. Population is 100% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 45% of households are family-led. County health: 34% adult obesity, 14% smoke.
- 3.1 people per household.
- 55% non-family households (singles, roommates).
Population & Trend
Population shrank 13.7% from 168 (2022) to 145 (2024). Estimated 2026 population: ~125 (extrapolated at -6.8%/yr trend). Census Bureau Vintage estimate: 102.
| Census data vintage | 2024 |
|---|---|
| Population | 6,372 people |
| Annual growth rate · Population change | -13.7% |
| Annual growth rate · Population (2022) | 168 |
| Annual growth rate · Population (2024) | 145 |
| Annual growth rate · Trend category | shrinking |
| Population | 145 people |
| Population Estimate | 102 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 34.1y is 4.8 years younger than the U.S. median (38.9y). Children under 18 make up 18% — below the U.S. share of ~22%.
| Age Summary · Median age | 34.1 years (vs Idaho 37.6y) |
|---|---|
| Age Summary · Children Pct | 17.9% |
| Age Summary · Character | young professional |
| Population under 18 | 26 |
| Median age | 34.1 years (vs Idaho 37.6y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 145 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.00 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 168 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| White (non-Hispanic) population | 100.0% |
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).
| Residents born in this state | 77 |
|---|---|
| Residents born in another state | 68 |
| Share born in this state | 53.1% |
| Share born in another state | 46.9% |
| Native-born U.S. citizens | 46.9% |
| Total foreign-born residents | 157 |
Households & Family Composition
47 households. Averaging 3.0 people each — larger than the U.S. average of 2.5. 45% are family households — below the U.S. share of ~65%. Of 32 families, 47% are married couples with children.
| Children under 18 | 34 |
|---|---|
| Total families | 32 |
| Married couples with children | 15 |
| Single-parent households | 3 |
| Average household size | 2.95 |
| Grandparents living with grandchildren | 121 |
| Grandparents responsible for grandchildren | 20 |
| Family households | 21 households |
| Households that are families | 44.7% |
| Total households | 47 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. 13.8% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Moved within the county (past year) | 13.8% |
|---|---|
| Migration · People moving in (annual) | 6,539 |
| Migration · People moving out (annual) | 6,570 |
| Migration · Net migration (in − out) | -31 |
| 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 | 4 |
|---|---|
| Disability rate | 3.3% |
Other
| Congressional District · District | 2 |
|---|---|
| Congressional District · Formatted | ID-02 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 16,007 |
| Cdc Birth Rate · State Fips | 16 |
| Cdc Birth Rate · County Fips | 7 |
| Cdc Birth Rate · County | Bear Lake |
| Cdc Birth Rate · Birth Rate | 21.7% |
| Cdc Birth Rate · Lower Ci | 14.40 |
| Cdc Birth Rate · Upper Ci | 31.30 |
| Cdc Mortality · Fips | 16,007 |
| Cdc Mortality · County | Bear Lake County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 198 |
| Cdc Vaccination · Fips | 16,007 |
| Cdc Vaccination · County | Bear Lake County |
| Cdc Vaccination · Dose1 Pop Pct | 53.8% |
| Cdc Vaccination · Series Complete Pct | 48.4% |
| Cdc Vaccination · Booster Pct | 42.6% |
| Cdc Vaccination · Population 2019 | 6,125 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 4.50 |
| Family Score · Schools | 7 |
| Family Score · Children Pct | 17.9% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 145, shrinking, young professional, very low crime, heritage: English/German |
| Town Summary · Population | 145 people |
| Town Summary · County | Bear Lake County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade