St. Tammany Parish: Demographics & People
About 272,421 people live in St. Tammany Parish. Median age 40.5 years. (2.6y older than Louisiana). Population is 12% Black and 8% Hispanic or Latino. County is gaining 3,340 residents per year (2022-2023). County health: 35% adult obesity, 16% smoke.
Population & Trend
Current population 272,421; figures track the most recent Census ACS 5-year estimates.
| Population | 272,421 people |
|---|---|
| Total Town Population | 77,603 people |
Age Distribution
Median age 40.5y is 1.6 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 272,421 |
|---|---|
| Age Summary · Under 18 | 64,297 |
| Age Summary · 18 To 34 | 51,216.0× |
| Age Summary · 35 To 64 | 106,670.0× |
| Age Summary · 65 Plus | 50,238 |
| Age Summary · Pct Under 18 | 23.6% |
| Age Summary · Pct 18 To 34 | 18.8% |
| Age Summary · Pct 35 To 64 | 39.2% |
| Median age | 40.5 years (vs Louisiana 37.9y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 272,421 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 272,421 people |
|---|---|
| White residents | 201,130 |
| Black residents | 33,305 |
| Asian residents | 3,711 |
| Census Demographics · Aian | 2,079 |
| Census Demographics · Nhpi | 952 |
| Census Demographics · Other Race | 4,729 |
| Census Demographics · Two Or More Races | 26,515 |
| Diversity Index | 43.0% |
| Asian population | 1.4% |
| Black population | 12.2% |
| Hispanic or Latino population | 8.2% |
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 | 272,421 |
|---|---|
| Census Citizenship · Native | 260,193 |
| Residents born in this state | 193,756 |
| Residents born in another state | 64,056 |
| Census Citizenship · Foreign Born | 36,082 |
| Census Citizenship · Naturalized | 8,019 |
| Census Citizenship · Non Citizen | 2,381 |
| Foreign-born residents | 13.2% |
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 3,340 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 244,785 |
|---|---|
| Migration · People moving out (annual) | 241,445 |
| Migration · Net migration (in − out) | 3,340 |
| 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 | 268,973 |
|---|---|
| With Disability | 43,192 |
| 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 | 2,568 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 270,014 |
|---|---|
| Census Mobility · Same House | 238,924 |
| Census Mobility · Same County | 14,317 |
| Census Mobility · Diff County Same State | 9,906 |
| Census Mobility · Diff State | 6,368 |
| Census Mobility · From Abroad | 499 |
| Census Mobility · Moved Total | 31,090 |
| Census Mobility · Pct Moved In Year | 11.5% |
| Pct White | 73.8% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28