St. Thomas: Demographics & People
228 people call St. Thomas home, in 89 households. Population shrank 15.9% from 271 (2022) to 228 (2024). Median age 39.6 years. Children under 18 are 24% of the population. Population is 98% White (non-Hispanic). The community is relatively homogeneous (Simpson index 0.00). 83% of households are family-led. County is gaining 414 residents per year (2022-2023). County health: 37% adult obesity, 16% smoke.
- 2.6 people per household.
- 17% non-family households (singles, roommates).
Population & Trend
Population shrank 15.9% from 271 (2022) to 228 (2024). Estimated 2026 population: ~193 (extrapolated at -7.9%/yr trend). Census Bureau Vintage estimate: 152.
| Census data vintage | 2024 |
|---|---|
| Population | 77,279 people |
| Annual growth rate · Population change | -15.9% |
| Annual growth rate · Population (2022) | 271 |
| Annual growth rate · Population (2024) | 228 |
| Annual growth rate · Trend category | shrinking |
| Population | 228 people |
| Population Estimate | 152 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 39.6y is 0.7 years older than the U.S. median (38.9y). Children under 18 make up 24% — above the U.S. share of ~22%.
| Age Summary · Median age | 39.6 years (vs Missouri 39.2y) |
|---|---|
| Age Summary · Children Pct | 24.1% |
| Age Summary · Character | family-oriented |
| Population under 18 | 55 |
| Median age | 39.6 years (vs Missouri 39.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 228 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 | 271 |
|---|---|
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 1 |
| Diversity Index · Largest group share | 100.0% |
| White (non-Hispanic) population | 97.8% |
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 (5)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 0.4% are foreign-born — below the U.S. average of 13.9%.
| Residents born in this state | 197 |
|---|---|
| Residents born in another state | 30 |
| Share born in this state | 86.4% |
| Share born in another state | 13.6% |
| Native-born U.S. citizens | 13.2% |
| Foreign-born residents | 0.4% |
| Total foreign-born residents | 4 |
| From Africa | 4 |
Households & Family Composition
89 households. Averaging 2.7 people each — larger than the U.S. average of 2.5. 83% are family households — above the U.S. share of ~65%. Of 77 families, 60% are married couples with children.
| Children under 18 | 71 |
|---|---|
| Total families | 77 |
| Married couples with children | 46 |
| Single-parent households | 1 |
| Average household size | 2.68 |
| Grandparents living with grandchildren | 597 |
| Grandparents responsible for grandchildren | 250 |
| Family households | 74 households |
| Households that are families | 83.1% |
| Total households | 89 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. 0.4% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 414 residents per year on net (IRS migration data).
| Moved within the county (past year) | 0.4% |
|---|---|
| Migration · People moving in (annual) | 72,796 |
| Migration · People moving out (annual) | 72,382 |
| Migration · Net migration (in − out) | 414 |
| Migration · Population growing | Yes |
| 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 | 7 |
|---|---|
| Disability rate | 2.8% |
Other
| Congressional District · District | 3 |
|---|---|
| Congressional District · Formatted | MO-03 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 29,051 |
| Cdc Birth Rate · State Fips | 29 |
| Cdc Birth Rate · County Fips | 51 |
| Cdc Birth Rate · County | Cole |
| Cdc Birth Rate · Birth Rate | 17.6% |
| Cdc Birth Rate · Lower Ci | 15.20 |
| Cdc Birth Rate · Upper Ci | 20.30 |
| Cdc Mortality · Fips | 29,051 |
| Cdc Mortality · County | Cole County |
| Cdc Mortality · Urban Rural | Small metro |
| Cdc Mortality · Total Deaths 2020 2023 | 3,552 |
| Cdc Vaccination · Fips | 29,051 |
| Cdc Vaccination · County | Cole County |
| Cdc Vaccination · Dose1 Pop Pct | 62.5% |
| Cdc Vaccination · Series Complete Pct | 55.0% |
| Cdc Vaccination · Booster Pct | 47.5% |
| Cdc Vaccination · Population 2019 | 76,745 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 3.50 |
| Family Score · Schools | 5 |
| Family Score · Children Pct | 24.1% |
| Family Score · Rating | fair |
| Town Summary · Key Facts | population 228, shrinking, family-oriented, upper-middle, mixed |
| Town Summary · Population | 228 people |
| Town Summary · County | Cole County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade