St. Onge: Demographics & People
Census counts 40 people in St. Onge, in 40 households. Population shrank 13.0% from 46 (2022) to 40 (2024). Median age -666,666,666.00. (666666710.8y younger than Lawrence County; 666666704.2y younger than South Dakota). Population is 100% White (non-Hispanic). County is gaining 3,156 residents per year (2022-2023). County health: 35% adult obesity, 16% smoke.
- 1.0 people per household.
Population & Trend
Population shrank 13.0% from 46 (2022) to 40 (2024). Estimated 2026 population: ~34 (extrapolated at -6.5%/yr trend). Census Bureau Vintage estimate: 28.
| Census data vintage | 2024 |
|---|---|
| Population | 25,768 people |
| Annual growth rate · Population change | -13.0% |
| Annual growth rate · Population (2022) | 46 |
| Annual growth rate · Population (2024) | 40 |
| Annual growth rate · Trend category | shrinking |
| Population | 40 people |
| Population Estimate | 28 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age -666666666.0y is 666666704.9 years younger than the U.S. median (38.9y).
| Median age | -666,666,666.00 (vs South Dakota 38.2y) |
|---|
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 40 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 46 |
|---|---|
| Diversity Index · Simpson Index | -0.32 |
| 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 (2)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 40 |
|---|---|
| Share born in this state | 100.0% |
| Total foreign-born residents | 665 |
Households & Family Composition
40 households.
| Grandparents living with grandchildren | 136 |
|---|---|
| Grandparents responsible for grandchildren | 57 |
| Total households | 40 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. The surrounding county is gaining 3,156 residents per year on net (IRS migration data).
| Lived in same home a year ago | 40.0% |
|---|---|
| Migration · People moving in (annual) | 29,964 |
| Migration · People moving out (annual) | 26,808 |
| Migration · Net migration (in − out) | 3,156 |
| 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 | 46,081 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 81 |
| Cdc Birth Rate · County | Lawrence |
| Cdc Birth Rate · Birth Rate | 8.2% |
| Cdc Birth Rate · Lower Ci | 6.00 |
| Cdc Birth Rate · Upper Ci | 11.10 |
| Cdc Mortality · Fips | 46,081 |
| Cdc Mortality · County | Lawrence County |
| Cdc Mortality · Urban Rural | Micropolitan |
| Cdc Mortality · Total Deaths 2020 2023 | 771 |
| Cdc Vaccination · Fips | 46,081 |
| Cdc Vaccination · County | Lawrence County |
| Cdc Vaccination · Dose1 Pop Pct | 77.1% |
| Cdc Vaccination · Series Complete Pct | 62.3% |
| Cdc Vaccination · Booster Pct | 38.4% |
| Cdc Vaccination · Population 2019 | 25,844 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 8.00 |
| Family Score · Schools | 14 |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 40, shrinking, high crime, heritage: Mexican/Hispanic or |
| Town Summary · Population | 40 people |
| Town Summary · County | Lawrence County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade