St. John the Baptist Parish: Demographics & People
St. John the Baptist Parish is home to 40,743 people. Median age 40.1 years. (2.2y older than Louisiana). Population is 57% Black and 9% Hispanic or Latino. County is losing 342 residents per year (2022-2023). County health: 45% adult obesity, 20% smoke.
Population & Trend
Current population 40,743; figures track the most recent Census ACS 5-year estimates.
| Population | 40,743 people |
|---|---|
| Total Town Population | 42,420 people |
Age Distribution
Median age 40.1y is 1.2 years older than the U.S. median (38.9y).
| Age Summary · Total Pop | 40,743 |
|---|---|
| Age Summary · Under 18 | 9,799 |
| Age Summary · 18 To 34 | 8,618.0× |
| Age Summary · 35 To 64 | 15,938.0× |
| Age Summary · 65 Plus | 6,388 |
| Age Summary · Pct Under 18 | 24.1% |
| Age Summary · Pct 18 To 34 | 21.1% |
| Age Summary · Pct 35 To 64 | 39.1% |
| 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 40,743 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 40,743 people |
|---|---|
| White residents | 12,614 |
| Black residents | 23,210 |
| Asian residents | 362 |
| Census Demographics · Aian | 147 |
| Census Demographics · Nhpi | 1 |
| Census Demographics · Other Race | 1,893 |
| Census Demographics · Two Or More Races | 2,516 |
| Diversity Index | 57.4% |
| Asian population | 0.9% |
| Black population | 57.0% |
| Hispanic or Latino population | 8.9% |
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 | 40,743 |
|---|---|
| Census Citizenship · Native | 38,570 |
| Residents born in this state | 33,836 |
| Residents born in another state | 4,281 |
| Census Citizenship · Foreign Born | 2,187 |
| Census Citizenship · Naturalized | 523 |
| Census Citizenship · Non Citizen | 453 |
| Foreign-born residents | 5.4% |
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 342 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 34,865 |
|---|---|
| Migration · People moving out (annual) | 35,207 |
| Migration · Net migration (in − out) | -342 |
| 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 | 40,376 |
|---|---|
| With Disability | 6,556 |
| Pct With Disability | 16.2% |
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 | 355 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 40,493 |
|---|---|
| Census Mobility · Same House | 37,506 |
| Census Mobility · Same County | 1,229 |
| Census Mobility · Diff County Same State | 1,339 |
| Census Mobility · Diff State | 337 |
| Census Mobility · From Abroad | 82 |
| Census Mobility · Moved Total | 2,987 |
| Census Mobility · Pct Moved In Year | 7.4% |
| Pct White | 31.0% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28