St. Francis: Demographics & People
Census counts 593 people in St. Francis, in 160 households. Population shrank 6.0% from 631 (2022) to 593 (2024). Median age 24.8 years. (0.7y younger than Todd County; 13.4y younger than South Dakota). Children under 18 are 42% of the population. Population is 26% Asian and 2% White (non-Hispanic). 64% of households are family-led. County is losing 74 residents per year (2022-2023). County health: 44% adult obesity, 34% smoke.
- 3.7 people per household.
- 36% non-family households (singles, roommates).
Population & Trend
Population shrank 6.0% from 631 (2022) to 593 (2024). Estimated 2026 population: ~557 (extrapolated at -3.0%/yr trend). Census Bureau Vintage estimate: 513.
| Census data vintage | 2024 |
|---|---|
| Population | 9,319 people |
| Annual growth rate · Population change | -6.0% |
| Annual growth rate · Population (2022) | 631 |
| Annual growth rate · Population (2024) | 593 |
| Annual growth rate · Trend category | shrinking |
| Population | 593 people |
| Population Estimate | 513 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 24.8y is 14.1 years younger than the U.S. median (38.9y). Children under 18 make up 42% — above the U.S. share of ~22%.
| Age Summary · Median age | 24.8 years (vs South Dakota 38.2y) |
|---|---|
| Age Summary · Children Pct | 42.0% |
| Age Summary · Character | young community |
| Population under 18 | 249 |
| Median age | 24.8 years (vs South Dakota 38.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 593 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 6 |
|---|---|
| Asian residents | 180 |
| Hispanic or Latino residents | 3 |
| Diversity Index · Simpson Index | 44.4% |
| Diversity Index · Interpretation | moderately diverse |
| Asian population | 26.1% |
| Hispanic or Latino population | 1.2% |
| White (non-Hispanic) population | 1.7% |
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 | 380 |
|---|---|
| Residents born in another state | 68 |
| Share born in this state | 64.1% |
| Share born in another state | 35.9% |
| Native-born U.S. citizens | 11.5% |
| Naturalized citizens | 24.5% |
| Total foreign-born residents | 144 |
| From Africa | 144 |
Households & Family Composition
160 households. Averaging 3.5 people each — larger than the U.S. average of 2.5. 64% are family households — near the U.S. share of ~65%. Of 132 families, 36% are married couples with children.
| Children under 18 | 272 |
|---|---|
| Total families | 132 |
| Married couples with children | 48 |
| Single-parent households | 12 |
| Average household size | 3.45 |
| Women who gave birth (past year) | 13.3% |
| Grandparents living with grandchildren | 53 |
| Grandparents responsible for grandchildren | 13 |
| Family households | 103 households |
| Households that are families | 64.4% |
| Total households | 160 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. 14.6% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is losing 74 residents per year on net (IRS migration data).
| Moved within the county (past year) | 14.6% |
|---|---|
| Migration · People moving in (annual) | 5,829 |
| Migration · People moving out (annual) | 5,903 |
| Migration · Net migration (in − out) | -74 |
| 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 | 20 |
|---|---|
| Disability rate | 3.2% |
Other
| Congressional District · District | at-large |
|---|---|
| Congressional District · Formatted | SD-AL |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 46,121 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 121 |
| Cdc Birth Rate · County | Todd |
| Cdc Birth Rate · Birth Rate | 85.8% |
| Cdc Birth Rate · Lower Ci | 74.10 |
| Cdc Birth Rate · Upper Ci | 98.60 |
| Cdc Mortality · Fips | 46,121 |
| Cdc Mortality · County | Todd County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 232 |
| Cdc Vaccination · Fips | 46,121 |
| Cdc Vaccination · County | Todd County |
| Cdc Vaccination · Dose1 Pop Pct | 95.0% |
| Cdc Vaccination · Series Complete Pct | 82.8% |
| Cdc Vaccination · Booster Pct | 65.3% |
| Cdc Vaccination · Population 2019 | 10,177 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 5.00 |
| Family Score · Schools | 8 |
| Family Score · Children Pct | 42.0% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 593, shrinking, young community, working-class, white collar |
| Town Summary · Population | 593 people |
| Town Summary · County | Todd County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade