St. Paul: Demographics & People
Census counts 3,456 people in St. Paul, in 1,198 households. Population grew 5.0% from 3,292 (2022) to 3,456 (2024). Median age 43.5 years. (3.7y older than St. Charles County; 4.3y older than Missouri). Children under 18 are 18% of the population. Population is 92% White (non-Hispanic) and 2% Black. The community is relatively homogeneous (Simpson index 0.04). 90% of households are family-led. County is gaining 5,845 residents per year (2022-2023). County health: 36% adult obesity, 16% smoke.
- 2.9 people per household.
- 10% non-family households (singles, roommates).
Population & Trend
Population grew 5.0% from 3,292 (2022) to 3,456 (2024) — about 8.3× the recent U.S. annual rate of ~0.6%/yr. Estimated 2026 population: ~3,630 (extrapolated at 2.5%/yr trend). Census Bureau Vintage estimate: 3,870.
| Census data vintage | 2024 |
|---|---|
| Population | 405,262 people |
| Annual growth rate · Population change | 5.0% |
| Annual growth rate · Population (2022) | 3,292 |
| Annual growth rate · Population (2024) | 3,456 |
| Annual growth rate · Population growing | Yes |
| Annual growth rate · Trend category | growing |
| Population | 3,456 people |
| Population Estimate | 3,870 |
Sources: Census ACS 5-Year 2023, Table B01003 · Refreshed 2026-04-12
Age Distribution
Median age 43.5y is 4.6 years older than the U.S. median (38.9y). Children under 18 make up 18% — below the U.S. share of ~22%.
| Age Summary · Median age | 43.5 years (vs Missouri 39.2y) |
|---|---|
| Age Summary · Children Pct | 17.7% |
| Age Summary · Character | established |
| Population under 18 | 612 |
| Median age | 43.5 years (vs Missouri 39.2y) |
Sources: Census ACS 5-Year 2023 · Refreshed 2026-04-12
Race, Ethnicity & Diversity
Of 3,456 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups). The Simpson diversity index is 0.04 (0 = single group, 1 = perfectly even distribution); this is read as relatively homogeneous.
| White residents | 3,130 |
|---|---|
| Black residents | 7 |
| Asian residents | 13 |
| Hispanic or Latino residents | 40 |
| Diversity Index · Diversity index (Simpson) | 3.7% |
| Diversity Index · Diversity label | relatively homogeneous |
| Diversity Index · Groups counted | 4 |
| Diversity Index · Largest group share | 98.1% |
| Asian population | 0.2% |
| Black population | 1.6% |
| Hispanic or Latino population | 1.2% |
| White (non-Hispanic) population | 92.1% |
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 (8)
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS). 0.1% are foreign-born — below the U.S. average of 13.9%. 1% have naturalized to U.S. citizenship.
| Residents born in this state | 2,380 |
|---|---|
| Residents born in another state | 1,040 |
| Share born in this state | 68.9% |
| Share born in another state | 31.1% |
| Native-born U.S. citizens | 30.1% |
| Foreign-born residents | 0.1% |
| Naturalized citizens | 0.9% |
| Total foreign-born residents | 58 |
| From Europe | 18 |
| From Africa | 24 |
Households & Family Composition
1,198 households. Averaging 2.9 people each — larger than the U.S. average of 2.5. 90% are family households — above the U.S. share of ~65%. Of 1,015 families, 28% are married couples with children.
| Children under 18 | 605 |
|---|---|
| Total families | 1,015 |
| Married couples with children | 281 |
| Single-parent households | 24 |
| Average household size | 2.86 |
| Women who gave birth (past year) | 5.7% |
| Grandparents living with grandchildren | 25 |
| Grandparents responsible for grandchildren | 6 |
| Family households | 1,082 households |
| Households that are families | 90.3% |
| Total households | 1,198 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. 19.6% moved within the county in the past year — the U.S. baseline is roughly 8–10%. The surrounding county is gaining 5,845 residents per year on net (IRS migration data).
| Moved within the county (past year) | 19.6% |
|---|---|
| Migration · People moving in (annual) | 403,338 |
| Migration · People moving out (annual) | 397,493 |
| Migration · Net migration (in − out) | 5,845 |
| 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 | 175 |
|---|---|
| Disability rate | 5.6% |
Other
| Congressional District · District | 3 |
|---|---|
| Congressional District · Formatted | MO-03 |
| Congressional District · Congress | 118th |
| Cdc Birth Rate · Fips | 29,183 |
| Cdc Birth Rate · State Fips | 29 |
| Cdc Birth Rate · County Fips | 183 |
| Cdc Birth Rate · County | St Charles |
| Cdc Birth Rate · Birth Rate | 7.0% |
| Cdc Birth Rate · Lower Ci | 6.30 |
| Cdc Birth Rate · Upper Ci | 7.80 |
| Cdc Mortality · Fips | 29,183 |
| Cdc Mortality · County | St. Charles County |
| Cdc Mortality · Urban Rural | Large fringe metro |
| Cdc Mortality · Total Deaths 2020 2023 | 11,643 |
| Cdc Vaccination · Fips | 29,183 |
| Cdc Vaccination · County | St. Charles County |
| Cdc Vaccination · Dose1 Pop Pct | 72.7% |
| Cdc Vaccination · Series Complete Pct | 64.3% |
| Cdc Vaccination · Booster Pct | 52.4% |
| Cdc Vaccination · Population 2019 | 402,022 |
| Cdc Vaccination · Metro Status | Metro |
| Family Score · Score | 10 |
| Family Score · Schools | 20 |
| Family Score · Children Pct | 17.7% |
| Family Score · Rating | excellent |
| Town Summary · Key Facts | population 3,456, growing, established, affluent, white collar |
| Town Summary · Population | 3,456 people |
| Town Summary · County | St. Charles County |
Sources: Census place-to-CD118 crosswalk (place_fips) · federal dataset cascade