St. Martin Parish: Demographics & People
Census counts 51,353 people in St. Martin Parish. Median age 40.1 years. (2.2y older than Louisiana). Population is 29% Black and 4% Hispanic or Latino. County is losing 68 residents per year (2022-2023). County health: 41% adult obesity, 23% smoke.
Population & Trend
Current population 51,353; figures track the most recent Census ACS 5-year estimates.
| Population | 51,353 people |
|---|---|
| Total Town Population | 31,290 people |
Age Distribution
Median age 40.1y is 1.2 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 51,353 |
|---|---|
| Age Summary · Under 18 | 12,336 |
| Age Summary · 18 To 34 | 10,153.0× |
| Age Summary · 35 To 64 | 20,030.0× |
| Age Summary · 65 Plus | 8,834 |
| Age Summary · Pct Under 18 | 24.0% |
| Age Summary · Pct 18 To 34 | 19.8% |
| Age Summary · Pct 35 To 64 | 39.0% |
| Median age | 40.1 years (vs Louisiana 37.9y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 51,353 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 51,353 people |
|---|---|
| White residents | 32,564 |
| Black residents | 14,690 |
| Asian residents | 390 |
| Census Demographics · Aian | 93 |
| Census Demographics · Nhpi | 48 |
| Census Demographics · Other Race | 390 |
| Census Demographics · Two Or More Races | 3,178 |
| Diversity Index | 51.2% |
| Asian population | 0.8% |
| Black population | 28.6% |
| Hispanic or Latino population | 3.6% |
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 | 51,353 |
|---|---|
| Census Citizenship · Native | 50,413 |
| Residents born in this state | 46,251 |
| Residents born in another state | 3,934 |
| Census Citizenship · Foreign Born | 2,345 |
| Census Citizenship · Naturalized | 697 |
| Census Citizenship · Non Citizen | 228 |
| Foreign-born residents | 4.6% |
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 losing 68 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 46,056 |
|---|---|
| Migration · People moving out (annual) | 46,124 |
| Migration · Net migration (in − out) | -68 |
| 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 | 50,912 |
|---|---|
| With Disability | 8,179 |
| Pct With Disability | 16.1% |
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 | 269 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 50,682 |
|---|---|
| Census Mobility · Same House | 47,022 |
| Census Mobility · Same County | 1,939 |
| Census Mobility · Diff County Same State | 981 |
| Census Mobility · Diff State | 678 |
| Census Mobility · From Abroad | 62 |
| Census Mobility · Moved Total | 3,660 |
| Census Mobility · Pct Moved In Year | 7.2% |
| Pct White | 63.4% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28