St. Mary Parish: Demographics & People
St. Mary Parish's population stands at 47,828 people. Median age 39.7 years. (1.8y older than Louisiana). Population is 29% Black and 10% Hispanic or Latino. County is losing 1,901 residents per year (2022-2023). County health: 39% adult obesity, 24% smoke.
Population & Trend
Current population 47,828; figures track the most recent Census ACS 5-year estimates.
| Population | 47,828 people |
|---|---|
| Total Town Population | 28,875 people |
Age Distribution
Median age 39.7y is 0.8 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 47,828 |
|---|---|
| Age Summary · Under 18 | 11,697 |
| Age Summary · 18 To 34 | 9,118.0× |
| Age Summary · 35 To 64 | 18,242.0× |
| Age Summary · 65 Plus | 8,771 |
| Age Summary · Pct Under 18 | 24.5% |
| Age Summary · Pct 18 To 34 | 19.1% |
| Age Summary · Pct 35 To 64 | 38.1% |
| Median age | 39.7 years (vs Louisiana 37.9y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 47,828 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 47,828 people |
|---|---|
| White residents | 27,202 |
| Black residents | 13,832 |
| Asian residents | 466 |
| Census Demographics · Aian | 731 |
| Census Demographics · Nhpi | 7 |
| Census Demographics · Other Race | 1,361 |
| Census Demographics · Two Or More Races | 4,229 |
| Diversity Index | 58.4% |
| Asian population | 1.0% |
| Black population | 28.9% |
| Hispanic or Latino population | 9.8% |
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 | 47,828 |
|---|---|
| Census Citizenship · Native | 45,459 |
| Residents born in this state | 40,603 |
| Residents born in another state | 4,442 |
| Census Citizenship · Foreign Born | 2,933 |
| Census Citizenship · Naturalized | 442 |
| Census Citizenship · Non Citizen | 414 |
| Foreign-born residents | 6.1% |
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 1,901 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 39,431 |
|---|---|
| Migration · People moving out (annual) | 41,332 |
| Migration · Net migration (in − out) | -1,901 |
| 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 | 47,136 |
|---|---|
| With Disability | 7,861 |
| Pct With Disability | 16.7% |
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 | 727 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 47,346 |
|---|---|
| Census Mobility · Same House | 42,209 |
| Census Mobility · Same County | 3,240 |
| Census Mobility · Diff County Same State | 1,345 |
| Census Mobility · Diff State | 507 |
| Census Mobility · From Abroad | 45 |
| Census Mobility · Moved Total | 5,137 |
| Census Mobility · Pct Moved In Year | 10.8% |
| Pct White | 56.9% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28