St. Louis County: Demographics & People
995,569 people call St. Louis County home. Median age 40.3 years. (1.1y older than Missouri). Population is 24% Black and 5% Asian. County is losing 10,393 residents per year (2022-2023). County health: 34% adult obesity, 16% smoke.
Population & Trend
Current population 995,569; figures track the most recent Census ACS 5-year estimates.
| Population | 995,569 people |
|---|---|
| Total Town Population | 845,394 people |
Age Distribution
Median age 40.3y is 1.4 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 995,569 |
|---|---|
| Age Summary · Under 18 | 218,904 |
| Age Summary · 18 To 34 | 209,948.0× |
| Age Summary · 35 To 64 | 376,398.0× |
| Age Summary · 65 Plus | 190,319 |
| Age Summary · Pct Under 18 | 22.0% |
| Age Summary · Pct 18 To 34 | 21.1% |
| Age Summary · Pct 35 To 64 | 37.8% |
| Median age | 40.3 years (vs Missouri 39.2y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 995,569 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 995,569 people |
|---|---|
| White residents | 618,307 |
| Black residents | 240,070 |
| Asian residents | 48,760 |
| Census Demographics · Aian | 1,148 |
| Census Demographics · Nhpi | 213 |
| Census Demographics · Other Race | 17,813 |
| Census Demographics · Two Or More Races | 69,258 |
| Diversity Index | 54.9% |
| Asian population | 4.9% |
| Black population | 24.1% |
| Hispanic or Latino population | 3.9% |
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 | 995,569 |
|---|---|
| Census Citizenship · Native | 912,426 |
| Residents born in this state | 666,943 |
| Residents born in another state | 237,733 |
| Census Citizenship · Foreign Born | 68,436 |
| Census Citizenship · Naturalized | 30,813 |
| Census Citizenship · Non Citizen | 7,750 |
| Foreign-born residents | 6.9% |
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 losing 10,393 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 897,558 |
|---|---|
| Migration · People moving out (annual) | 907,951 |
| Migration · Net migration (in − out) | -10,393 |
| 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 | 984,487 |
|---|---|
| With Disability | 119,072 |
| Pct With Disability | 12.1% |
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 | 19,979 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 984,840 |
|---|---|
| Census Mobility · Same House | 868,162 |
| Census Mobility · Same County | 67,049 |
| Census Mobility · Diff County Same State | 24,515 |
| Census Mobility · Diff State | 19,562 |
| Census Mobility · From Abroad | 5,552 |
| Census Mobility · Moved Total | 116,678 |
| Census Mobility · Pct Moved In Year | 11.8% |
| Pct White | 62.1% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28