St. Joseph County: Demographics & People
St. Joseph County's population stands at 273,040 people. Median age 36.7 years. (1.5y younger than Indiana). Population is 12% Black and 11% Hispanic or Latino. County is losing 2,804 residents per year (2022-2023). County health: 36% adult obesity, 18% smoke.
Population & Trend
Current population 273,040; figures track the most recent Census ACS 5-year estimates.
| Population | 273,040 people |
|---|---|
| Total Town Population | 202,138 people |
Age Distribution
Median age 36.7y is 2.2 years younger than the U.S. median (38.9y).
| Age Summary · Total Pop | 273,040 |
|---|---|
| Age Summary · Under 18 | 63,303 |
| Age Summary · 18 To 34 | 67,378.0× |
| Age Summary · 35 To 64 | 96,336.0× |
| Age Summary · 65 Plus | 46,023 |
| Age Summary · Pct Under 18 | 23.2% |
| Age Summary · Pct 18 To 34 | 24.7% |
| Age Summary · Pct 35 To 64 | 35.3% |
| Median age | 36.7 years (vs Indiana 38.2y) |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Race, Ethnicity & Diversity
Of 273,040 residents, race / ethnicity breaks down by Census ACS counts (a person can identify with one or more groups).
| Census Demographics · Total Population | 273,040 people |
|---|---|
| White residents | 193,905 |
| Black residents | 34,025 |
| Asian residents | 7,435 |
| Census Demographics · Aian | 736 |
| Census Demographics · Nhpi | 236 |
| Census Demographics · Other Race | 8,654 |
| Census Demographics · Two Or More Races | 28,049 |
| Diversity Index | 46.8% |
| Asian population | 2.7% |
| Black population | 12.5% |
| Hispanic or Latino population | 10.5% |
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 | 273,040 |
|---|---|
| Census Citizenship · Native | 254,335 |
| Residents born in this state | 172,818 |
| Residents born in another state | 78,904 |
| Census Citizenship · Foreign Born | 17,920 |
| Census Citizenship · Naturalized | 9,079 |
| Census Citizenship · Non Citizen | 2,613 |
| Foreign-born residents | 6.6% |
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 2,804 residents per year on net (IRS migration data).
| Migration · People moving in (annual) | 243,444 |
|---|---|
| Migration · People moving out (annual) | 246,248 |
| Migration · Net migration (in − out) | -2,804 |
| 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 | 270,275 |
|---|---|
| With Disability | 36,194 |
| Pct With Disability | 13.4% |
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 | 11,850 |
|---|
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28
Other
| Census Mobility · Total | 269,924 |
|---|---|
| Census Mobility · Same House | 235,850 |
| Census Mobility · Same County | 18,525 |
| Census Mobility · Diff County Same State | 4,853 |
| Census Mobility · Diff State | 9,058 |
| Census Mobility · From Abroad | 1,638 |
| Census Mobility · Moved Total | 34,074 |
| Census Mobility · Pct Moved In Year | 12.6% |
| Pct White | 71.0% |
Sources: Census ACS 5-Year 2024 — county-level query · Refreshed 2026-04-28