St. Charles: Demographics & People
St. Charles is home to 6 people, in 3 households. Population shrank 45.5% from 11 (2022) to 6 (2024). Median age 67.0 years. (22.3y older than Gregory County; 28.8y older than South Dakota). Population is 100% White (non-Hispanic). 67% of households are family-led. County health: 37% adult obesity, 20% smoke.
- 2.0 people per household.
- 33% non-family households (singles, roommates).
Population & Trend
Population shrank 45.5% from 11 (2022) to 6 (2024). Estimated 2026 population: ~3 (extrapolated at -22.7%/yr trend). Census Bureau Vintage estimate: 1.
| Census data vintage | 2024 |
|---|---|
| Population | 3,994 people |
| Annual growth rate · Population change | -45.5% |
| Annual growth rate · Population (2022) | 11 |
| Annual growth rate · Population (2024) | 6 |
| Annual growth rate · Trend category | shrinking |
| Population | 6 people |
| Population Estimate | 1 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 67.0y is 28.1 years older than the U.S. median (38.9y).
| Age Summary · Median age | 67.0 years (vs South Dakota 38.2y) |
|---|---|
| Age Summary · Character | retirement community |
| Median age | 67.0 years (vs South Dakota 38.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 6 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 9 |
|---|---|
| Diversity Index · Simpson Index | -1.25 |
| Diversity Index · Interpretation | less diverse |
| 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 (1)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 4 |
|---|---|
| Residents born in another state | 2 |
| Share born in this state | 66.7% |
| Share born in another state | 33.3% |
| Native-born U.S. citizens | 33.3% |
| Total foreign-born residents | 40 |
Households & Family Composition
3 households. Averaging 1.8 people each — smaller than the U.S. average of 2.5. 67% are family households — near the U.S. share of ~65%. Of 2 families, 0% are married couples with children.
| Total families | 2 |
|---|---|
| Average household size | 1.83 |
| Women who gave birth (past year) | 66.7% |
| Grandparents living with grandchildren | 11 |
| Grandparents responsible for grandchildren | 8 |
| Family households | 2 households |
| Households that are families | 66.7% |
| Total households | 3 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.
| Lived in same home a year ago | 6.0% |
|---|---|
| Migration · People moving in (annual) | 3,758 |
| Migration · People moving out (annual) | 3,713 |
| Migration · Net migration (in − out) | 45 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2021-2022 · Refreshed 2026-04-12
Other
| Congressional District · District | at-large |
|---|---|
| Congressional District · Formatted | SD-AL |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 46,053 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 53 |
| Cdc Birth Rate · County | Gregory |
| Cdc Birth Rate · Birth Rate | 20.5% |
| Cdc Birth Rate · Lower Ci | 11.60 |
| Cdc Birth Rate · Upper Ci | 33.40 |
| Cdc Mortality · Fips | 46,053 |
| Cdc Mortality · County | Gregory County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 184 |
| Cdc Vaccination · Fips | 46,053 |
| Cdc Vaccination · County | Gregory County |
| Cdc Vaccination · Dose1 Pop Pct | 62.6% |
| Cdc Vaccination · Series Complete Pct | 53.4% |
| Cdc Vaccination · Booster Pct | 53.2% |
| Cdc Vaccination · Population 2019 | 4,185 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 5.00 |
| Family Score · Schools | 8 |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 6, shrinking, retirement community, high crime |
| Town Summary · Population | 6 people |
| Town Summary · County | Gregory County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade