St. Clair County: Demographics & People
Census counts 9,587 people in St. Clair County. Median age 46.1 years. (6.9y older than Missouri). Population is 2% Hispanic or Latino and 1% Black. County is gaining 586 residents per year (2022-2023). County health: 39% adult obesity, 25% smoke.
Population & Trend
Current population 9,587; figures track the most recent Census ACS 5-year estimates.
| Population | 9,587 people |
|---|---|
| Total Town Population | 2,825 people |
Age Distribution
Median age 46.1y is 7.2 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 9,587 |
|---|---|
| Age Summary · Under 18 | 2,038 |
| Age Summary · 18 To 34 | 1,545.0× |
| Age Summary · 35 To 64 | 3,547.0× |
| Age Summary · 65 Plus | 2,457 |
| Age Summary · Pct Under 18 | 21.3% |
| Age Summary · Pct 18 To 34 | 16.1% |
| Age Summary · Pct 35 To 64 | 37.0% |
| Median age | 46.1 years (vs Missouri 39.2y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 9,587 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 9,587 people |
|---|---|
| White residents | 8,960 |
| Black residents | 77 |
| Asian residents | 24 |
| Census Demographics · Aian | 16 |
| Census Demographics · Other Race | 71 |
| Census Demographics · Two Or More Races | 439 |
| Hispanic or Latino residents | 213 |
| Diversity Index | 12.4% |
| Asian population | 0.2% |
| Black population | 0.8% |
| Hispanic or Latino population | 2.2% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Citizenship & Origin
Where residents were born and their citizenship status (Census ACS).
| Census Citizenship · Total | 9,587 |
|---|---|
| Census Citizenship · Native | 9,475 |
| Residents born in this state | 6,564 |
| Residents born in another state | 2,866 |
| Census Citizenship · Foreign Born | 826 |
| Census Citizenship · Naturalized | 636 |
| Census Citizenship · Non Citizen | 45 |
| Foreign-born residents | 8.6% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Residential Stability & Migration
How long residents have lived here and where they came from. The surrounding county is gaining 586 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 8,649 |
|---|---|
| Migration · People moving out (annual) | 8,063 |
| Migration · Net migration (in − out) | 586 |
| Migration · Population growing | Yes |
| Migration · Year | 2022-2023 |
Sources: IRS SOI Migration 2022-2023
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.
| Census Disability · Total Pop | 9,385 |
|---|---|
| With Disability | 1,958 |
| Pct With Disability | 20.9% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Group Quarters
Group quarters are non-household living arrangements counted by the Census — college dormitories, nursing homes, military barracks, group homes, correctional facilities, and similar institutional or shared housing. 0 residents live in group quarters.
| Census Group Quarters · Total | 187 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 9,536 |
|---|---|
| Census Mobility · Same House | 8,469 |
| Census Mobility · Same County | 308 |
| Census Mobility · Diff County Same State | 536 |
| Census Mobility · Diff State | 211 |
| Census Mobility · From Abroad | 12 |
| Census Mobility · Moved Total | 1,067 |
| Census Mobility · Pct Moved In Year | 11.2% |
| Pct White | 93.5% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28