St. Lawrence: Demographics & People
St. Lawrence is home to 172 people, in 88 households. Population grew 18.6% from 145 (2022) to 172 (2024). Median age 49.6 years. (7.1y older than Hand County; 11.4y older than South Dakota). Children under 18 are 23% of the population. Population is 81% White (non-Hispanic) and 3% Black. 64% of households are family-led. County health: 34% adult obesity, 16% smoke.
- 2.0 people per household.
- 36% non-family households (singles, roommates).
Population & Trend
Population grew 18.6% from 145 (2022) to 172 (2024) — about 31.0× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~205 (extrapolated at 9.3%/yr trend). Census Bureau Vintage estimate: 256.
| Census data vintage | 2024 |
|---|---|
| Population | 3,145 people |
| Annual growth rate · Population change | 18.6% |
| Annual growth rate · Population (2022) | 145 |
| Annual growth rate · Population (2024) | 172 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | booming |
| Population | 172 people |
| Population Estimate | 256 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 49.6y is 10.7 years older than the U.S. median (38.9y). Children under 18 make up 23% — above the U.S. share of ~22%.
| Age Summary · Median age | 49.6 years (vs South Dakota 38.2y) |
|---|---|
| Age Summary · Children Pct | 23.3% |
| Age Summary · Character | established |
| Population under 18 | 40 |
| Median age | 49.6 years (vs South Dakota 38.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 172 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| White residents | 141 |
|---|---|
| Diversity Index · Simpson Index | 29.5% |
| Diversity Index · Interpretation | less diverse |
| Asian population | 1.7% |
| Black population | 2.9% |
| White (non-Hispanic) population | 81.4% |
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 (4)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Residents born in this state | 119 |
|---|---|
| Residents born in another state | 50 |
| Share born in this state | 69.2% |
| Share born in another state | 30.8% |
| Native-born U.S. citizens | 29.1% |
| Naturalized citizens | 1.7% |
| Total foreign-born residents | 48 |
Households & Family Composition
88 households. Averaging 2.0 people each — smaller than the U.S. average of 2.5. 64% are family households — near the U.S. share of ~65%. Of 36 families, 36% are married couples with children.
| Children under 18 | 34 |
|---|---|
| Total families | 36 |
| Married couples with children | 13 |
| Average household size | 2.01 |
| Women who gave birth (past year) | 18.6% |
| Grandparents living with grandchildren | 1 |
| Family households | 56 households |
| Households that are families | 63.6% |
| Total households | 88 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. 4.7% moved within the county in the past year — the U.S. baseline is roughly 8–10%.
| Moved within the county (past year) | 4.7% |
|---|---|
| Migration · People moving in (annual) | 2,877 |
| Migration · People moving out (annual) | 2,880 |
| Migration · Net migration (in − out) | -3 |
| 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 | 5 |
|---|---|
| Disability rate | 2.9% |
Other
| Congressional District · District | at-large |
|---|---|
| Congressional District · Formatted | SD-AL |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 46,059 |
| Cdc Birth Rate · State Fips | 46 |
| Cdc Birth Rate · County Fips | 59 |
| Cdc Birth Rate · County | Hand |
| Cdc Birth Rate · Birth Rate | 12.3% |
| Cdc Birth Rate · Lower Ci | 5.20 |
| Cdc Birth Rate · Upper Ci | 24.90 |
| Cdc Mortality · Fips | 46,059 |
| Cdc Mortality · County | Hand County |
| Cdc Mortality · Urban Rural | Noncore |
| Cdc Mortality · Total Deaths 2020 2023 | 162 |
| Cdc Vaccination · Fips | 46,059 |
| Cdc Vaccination · County | Hand County |
| Cdc Vaccination · Dose1 Pop Pct | 56.3% |
| Cdc Vaccination · Series Complete Pct | 50.7% |
| Cdc Vaccination · Booster Pct | 54.8% |
| Cdc Vaccination · Population 2019 | 3,191 |
| Cdc Vaccination · Metro Status | Non-metro |
| Family Score · Score | 3.50 |
| Family Score · Schools | 5 |
| Family Score · Children Pct | 23.3% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 172, booming, established, working-class, blue collar |
| Town Summary · Population | 172 people |
| Town Summary · County | Hand County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade