St. Joseph County's 2026 population is estimated at 273,916, reflecting a 0.03% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). St. Joseph County is the 5th largest county in Indiana. The 2010 population was 266,799 and has grown 2.67% since 2010.
Data after 2023 is projected based on recent change
Overall: 36.7 years
Female: 37.7 years
Male: 35.6 years
There are 209,737 adults, (46,023 of whom are seniors) in St. Joseph County.
Female: 139,662 (51.2%)
Male: 133,378 (48.8%)
The racial composition of St. Joseph County includes 71.02% White, 12.46% Black or African American, 3.17% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 193,905 | 71.02% |
| Black or African American | 34,025 | 12.46% |
| Two or more races | 28,049 | 10.27% |
| Other race | 8,654 | 3.17% |
| Asian | 7,435 | 2.72% |
| Native American | 736 | 0.27% |
| Native Hawaiian or Pacific Islander | 236 | 0.09% |
St. Joseph County 's average per capita income is $47,363. Household income levels show a median of $66,868. The poverty rate stands at 14.22%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $103,840 | $131,934 |
| Families | $87,495 | $113,517 |
| Households | $66,868 | $92,212 |
| Non Families | $40,765 | $57,526 |
Average Income
Median Household Income
Poverty Rate