St. Mary Parish's estimated 2026 population is 46,131 with a growth rate of -0.9% in the past year according to the most recent United States census data. St. Mary Parish is the 23rd largest parish in Louisiana. The 2010 population was 54,553 and has seen a growth of -15.44% since that time.
Data after 2023 is projected based on recent change
Overall: 39.7 years
Female: 40.7 years
Male: 39.2 years
There are 36,131 adults, (8,771 of whom are seniors) in St. Mary Parish.
Female: 24,581 (51.4%)
Male: 23,247 (48.6%)
The racial composition of St. Mary Parish includes 56.87% White, 28.92% Black or African American, and smaller percentages for other race, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 27,202 | 56.87% |
| Black or African American | 13,832 | 28.92% |
| Two or more races | 4,229 | 8.84% |
| Other race | 1,361 | 2.85% |
| Native American | 731 | 1.53% |
| Asian | 466 | 0.97% |
| Native Hawaiian or Pacific Islander | 7 | 0.01% |
St. Mary Parish's average per capita income is $39,311. Household income levels show a median of $52,576. The poverty rate stands at 20.79%.
Name | Median | Mean |
|---|---|---|
| Married Families | $88,924 | - |
| Families | $66,013 | $79,249 |
| Households | $52,576 | $71,245 |
| Non Families | $30,480 | $52,693 |
Average Income
Median Household Income
Poverty Rate